Tesseract 3.02

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makerow.cpp File Reference
`#include "mfcpch.h"`
`#include "stderr.h"`
`#include "blobbox.h"`
`#include "ccstruct.h"`
`#include "detlinefit.h"`
`#include "statistc.h"`
`#include "drawtord.h"`
`#include "blkocc.h"`
`#include "sortflts.h"`
`#include "oldbasel.h"`
`#include "textord.h"`
`#include "tordmain.h"`
`#include "underlin.h"`
`#include "makerow.h"`
`#include "tprintf.h"`
`#include "tovars.h"`

Go to the source code of this file.

## Namespaces

namespace | tesseract

## Macros

#define | MAX_HEIGHT_MODES 12

## Functions

float | MakeRowFromSubBlobs (TO_BLOCK *block, C_BLOB *blob, TO_ROW_IT *row_it)
make_single_row
Arrange the blobs into a single row... well actually, if there is only a single blob, it makes 2 rows, in case the top-level blob is a container of the real blobs to recognize.
float | make_single_row (ICOORD page_tr, TO_BLOCK *block, TO_BLOCK_LIST *blocks)
make_rows
Arrange the blobs into rows.
float | make_rows (ICOORD page_tr, TO_BLOCK_LIST *port_blocks)
make_initial_textrows
Arrange the good blobs into rows of text.
void | make_initial_textrows (ICOORD page_tr, TO_BLOCK *block, FCOORD rotation, BOOL8 testing_on)
fit_lms_line
Fit an LMS line to a row.
void | fit_lms_line (TO_ROW *row)
find_best_dropout_row
Delete this row if it has a neighbour with better dropout characteristics. TRUE is returned if the row should be deleted.
BOOL8 | find_best_dropout_row (TO_ROW *row, inT32 distance, float dist_limit, inT32 line_index, TO_ROW_IT *row_it, BOOL8 testing_on)
deskew_block_coords
Compute the bounding box of all the blobs in the block if they were deskewed without actually doing it.
TBOX | deskew_block_coords (TO_BLOCK *block, float gradient)
compute_line_occupation
Compute the pixel projection back on the y axis given the global skew. Also compute the 1st derivative.
void | compute_line_occupation (TO_BLOCK *block, float gradient, inT32 min_y, inT32 max_y, inT32 *occupation, inT32 *deltas)
void | compute_occupation_threshold (inT32 low_window, inT32 high_window, inT32 line_count, inT32 *occupation, inT32 *thresholds)
compute_dropout_distances
Compute the distance from each coordinate to the nearest dropout.
void | compute_dropout_distances (inT32 *occupation, inT32 *thresholds, inT32 line_count)
expand_rows
Expand each row to the least of its allowed size and touching its neighbours. If the expansion would entirely swallow a neighbouring row then do so.
void | expand_rows (ICOORD page_tr, TO_BLOCK *block, float gradient, FCOORD rotation, inT32 block_edge, BOOL8 testing_on)
void | adjust_row_limits (TO_BLOCK *block)
compute_row_stats
Compute the linespacing and offset.
void | compute_row_stats (TO_BLOCK *block, BOOL8 testing_on)
fill_heights
Fill the given heights with heights of the blobs that are legal candidates for estimating xheight.
void | fill_heights (TO_ROW *row, float gradient, int min_height, int max_height, STATS *heights, STATS *floating_heights)
compute_xheight_from_modes

Given a STATS object heights, looks for two most frequently occurring heights that look like xheight and xheight + ascrise. If found, sets the values of *xheight and *ascrise accordingly, otherwise sets xheight to any most frequently occurring height and sets *ascrise to 0. Returns the number of times xheight occurred in heights. For each mode that is considered for being an xheight the count of floating blobs (stored in floating_heights) is subtracted from the total count of the blobs of this height. This is done because blobs that sit far above the baseline could represent valid ascenders, but it is highly unlikely that such a character's height will be an xheight (e.g. -, ', =, ^, `, ", ', etc) If cap_only, then force finding of only the top mode.

int | compute_xheight_from_modes (STATS *heights, STATS *floating_heights, bool cap_only, int min_height, int max_height, float *xheight, float *ascrise)
compute_row_descdrop

Estimates the descdrop of this row. This function looks for "significant" descenders of lowercase letters (those that could not just be the small descenders of upper case letters like Q,J). The function also takes into account how many potential ascenders this row might contain. If the number of potential ascenders along with descenders is close to the expected fraction of the total number of blobs in the row, the function returns the descender height, returns 0 otherwise.

inT32 | compute_row_descdrop (TO_ROW *row, float gradient, int xheight_blob_count, STATS *asc_heights)
compute_height_modes
Find the top maxmodes values in the input array and put their indices in the output in the order in which they occurred.
inT32 | compute_height_modes (STATS *heights, inT32 min_height, inT32 max_height, inT32 *modes, inT32 maxmodes)
correct_row_xheight
Adjust the xheight etc of this row if not within reasonable limits of the average for the block.
void | correct_row_xheight (TO_ROW *row, float xheight, float ascrise, float descdrop)
separate_underlines
Test wide objects for being potential underlines. If they are then put them in a separate list in the block.
void | separate_underlines (TO_BLOCK *block, float gradient, FCOORD rotation, BOOL8 testing_on)
pre_associate_blobs
Associate overlapping blobs and fake chop wide blobs.
void | pre_associate_blobs (ICOORD page_tr, TO_BLOCK *block, FCOORD rotation, BOOL8 testing_on)
fit_parallel_rows
Re-fit the rows in the block to the given gradient.
void | fit_parallel_rows (TO_BLOCK *block, float gradient, FCOORD rotation, inT32 block_edge, BOOL8 testing_on)
fit_parallel_lms
Fit an LMS line to a row. Make the fit parallel to the given gradient and set the row accordingly.
void | fit_parallel_lms (float gradient, TO_ROW *row)
make_baseline_spline
Fit an LMS line to a row. Make the fit parallel to the given gradient and set the row accordingly.
void | make_baseline_spline (TO_ROW *row, TO_BLOCK *block)
segment_baseline
Divide the baseline up into segments which require a different quadratic fitted to them. Return TRUE if enough blobs were far enough away to need a quadratic.
BOOL8 | segment_baseline (TO_ROW *row, TO_BLOCK *block, inT32 &segments, inT32 xstarts[])
linear_spline_baseline

Divide the baseline up into segments which require a different quadratic fitted to them.

Returns:
  TRUE if enough blobs were far enough away to need a quadratic.

double * | linear_spline_baseline (TO_ROW *row, TO_BLOCK *block, inT32 &segments, inT32 xstarts[])
assign_blobs_to_rows
Make enough rows to allocate all the given blobs to one. If a block skew is given, use that, else attempt to track it.
void | assign_blobs_to_rows (TO_BLOCK *block, float *gradient, int pass, BOOL8 reject_misses, BOOL8 make_new_rows, BOOL8 drawing_skew)
most_overlapping_row
Return the row which most overlaps the blob.
OVERLAP_STATE | most_overlapping_row (TO_ROW_IT *row_it, TO_ROW *&best_row, float top, float bottom, float rowsize, BOOL8 testing_blob)
blob_x_order
Sort function to sort blobs in x from page left.
int | blob_x_order (const void *item1, const void *item2)
row_y_order
Sort function to sort rows in y from page top.
int | row_y_order (const void *item1, const void *item2)
row_spacing_order
Qsort style function to compare 2 TO_ROWS based on their spacing value.
int | row_spacing_order (const void *item1, const void *item2)
mark_repeated_chars
Mark blobs marked with BTFT_LEADER in repeated sets using the repeated_set member of BLOBNBOX.
void | mark_repeated_chars (TO_ROW *row)

## Variables

bool | textord_heavy_nr = FALSE
bool | textord_show_initial_rows = FALSE
bool | textord_show_parallel_rows = FALSE
bool | textord_show_expanded_rows = FALSE
bool | textord_show_final_rows = FALSE
bool | textord_show_final_blobs = FALSE
bool | textord_test_landscape = FALSE
bool | textord_parallel_baselines = TRUE
bool | textord_straight_baselines = FALSE
bool | textord_old_baselines = TRUE
bool | textord_old_xheight = FALSE
bool | textord_fix_xheight_bug = TRUE
bool | textord_fix_makerow_bug = TRUE
bool | textord_debug_xheights = FALSE
bool | textord_biased_skewcalc = TRUE
bool | textord_interpolating_skew = TRUE
int | textord_skewsmooth_offset = 2
int | textord_skewsmooth_offset2 = 1
int | textord_test_x = -1
int | textord_test_y = -1
int | textord_min_blobs_in_row = 4
int | textord_spline_minblobs = 8
int | textord_spline_medianwin = 6
int | textord_max_blob_overlaps = 4
int | textord_min_xheight = 10
double | textord_spline_shift_fraction = 0.02
double | textord_spline_outlier_fraction = 0.1
double | textord_skew_ile = 0.5
double | textord_skew_lag = 0.01
double | textord_linespace_iqrlimit = 0.2
double | textord_width_limit = 8
double | textord_chop_width = 1.5
double | textord_expansion_factor = 1.0
double | textord_overlap_x = 0.5
double | textord_minxh = 0.25
double | textord_min_linesize = 1.25
double | textord_excess_blobsize = 1.3
double | textord_occupancy_threshold = 0.4
double | textord_underline_width = 2.0
double | textord_min_blob_height_fraction = 0.75
double | textord_xheight_mode_fraction = 0.4
double | textord_ascheight_mode_fraction = 0.08
double | textord_descheight_mode_fraction = 0.08
double | textord_ascx_ratio_min = 1.25
double | textord_ascx_ratio_max = 1.8
double | textord_descx_ratio_min = 0.25
double | textord_descx_ratio_max = 0.6
double | textord_xheight_error_margin = 0.1
int | textord_lms_line_trials = 12
bool | textord_new_initial_xheight = TRUE
const int | kMinLeaderCount = 5

## compute_page_skew

Compute the skew over a full page by averaging the gradients over all the lines. Get the error of the same row.
const double | kNoiseSize = 0.5
const int | kMinSize = 8
void | compute_page_skew (TO_BLOCK_LIST *blocks, float &page_m, float &page_err)
void | cleanup_rows_making (ICOORD page_tr, TO_BLOCK *block, float gradient, FCOORD rotation, inT32 block_edge, BOOL8 testing_on)
void | delete_non_dropout_rows (TO_BLOCK *block, float gradient, FCOORD rotation, inT32 block_edge, BOOL8 testing_on)

## Macro Definition Documentation

#define MAX_HEIGHT_MODES 12

Definition at line 105 of file makerow.cpp.

## Function Documentation

void adjust_row_limits | ( | TO_BLOCK * | block | ) |

adjust_row_limits

Change the limits of rows to suit the default fractions.

Definition at line 1223 of file makerow.cpp.

{
TO_ROW *row; //current row
float size; //size of row
float ymax; //top of row
float ymin; //bottom of row
TO_ROW_IT row_it = block->get_rows ();
if (textord_show_expanded_rows)
tprintf("Adjusting row limits for block(%d,%d)\n",
block->block->bounding_box().left(),
block->block->bounding_box().top());
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
size = row->max_y () - row->min_y ();
if (textord_show_expanded_rows)
tprintf("Row at %f has min %f, max %f, size %f\n",
row->intercept(), row->min_y(), row->max_y(), size);
size /= tesseract::CCStruct::kXHeightFraction +
tesseract::CCStruct::kAscenderFraction +
tesseract::CCStruct::kDescenderFraction;
ymax = size * (tesseract::CCStruct::kXHeightFraction +
tesseract::CCStruct::kAscenderFraction);
ymin = -size * tesseract::CCStruct::kDescenderFraction;
row->set_limits (row->intercept () + ymin, row->intercept () + ymax);
row->merged = FALSE;
}
}

void assign_blobs_to_rows | ( | TO_BLOCK * | block,
|  | float * | gradient,
|  | int | pass,
|  | BOOL8 | reject_misses,
|  | BOOL8 | make_new_rows,
|  | BOOL8 | drawing_skew
| ) |  |

Definition at line 2402 of file makerow.cpp.

{
OVERLAP_STATE overlap_result; //what to do with it
float ycoord; //current y
float top, bottom; //of blob
float g_length = 1.0f; //from gradient
inT16 row_count; //no of rows
inT16 left_x; //left edge
inT16 last_x; //previous edge
float block_skew; //y delta
float smooth_factor; //for new coords
float near_dist; //dist to nearest row
ICOORD testpt; //testing only
BLOBNBOX *blob; //current blob
TO_ROW *row; //current row
TO_ROW *dest_row = NULL; //row to put blob in
//iterators
BLOBNBOX_IT blob_it = &block->blobs;
TO_ROW_IT row_it = block->get_rows ();
ycoord =
(block->block->bounding_box ().bottom () +
block->block->bounding_box ().top ()) / 2.0f;
if (gradient != NULL)
g_length = sqrt (1 + *gradient * *gradient);
#ifndef GRAPHICS_DISABLED
if (drawing_skew)
to_win->SetCursor(block->block->bounding_box ().left (), ycoord);
#endif
testpt = ICOORD (textord_test_x, textord_test_y);
blob_it.sort (blob_x_order);
smooth_factor = 1.0;
block_skew = 0.0f;
row_count = row_it.length (); //might have rows
if (!blob_it.empty ()) {
left_x = blob_it.data ()->bounding_box ().left ();
}
else {
left_x = block->block->bounding_box ().left ();
}
last_x = left_x;
for (blob_it.mark_cycle_pt (); !blob_it.cycled_list (); blob_it.forward ()) {
blob = blob_it.data ();
if (gradient != NULL) {
block_skew = (1 - 1 / g_length) * blob->bounding_box ().bottom ()
+ *gradient / g_length * blob->bounding_box ().left ();
}
else if (blob->bounding_box ().left () - last_x > block->line_size / 2
&& last_x - left_x > block->line_size * 2
&& textord_interpolating_skew) {
// tprintf("Interpolating skew from %g",block_skew);
block_skew *= (float) (blob->bounding_box ().left () - left_x)
/ (last_x - left_x);
// tprintf("to %g\n",block_skew);
}
last_x = blob->bounding_box ().left ();
top = blob->bounding_box ().top () - block_skew;
bottom = blob->bounding_box ().bottom () - block_skew;
#ifndef GRAPHICS_DISABLED
if (drawing_skew)
to_win->DrawTo(blob->bounding_box ().left (), ycoord + block_skew);
#endif
if (!row_it.empty ()) {
for (row_it.move_to_first ();
!row_it.at_last () && row_it.data ()->min_y () > top;
row_it.forward ());
row = row_it.data ();
if (row->min_y () <= top && row->max_y () >= bottom) {
//any overlap
dest_row = row;
overlap_result = most_overlapping_row (&row_it, dest_row,
top, bottom,
block->line_size,
blob->bounding_box ().
contains (testpt));
if (overlap_result == NEW_ROW && !reject_misses)
overlap_result = ASSIGN;
}
else {
overlap_result = NEW_ROW;
if (!make_new_rows) {
near_dist = row_it.data_relative (-1)->min_y () - top;
//below bottom
if (bottom < row->min_y ()) {
if (row->min_y () - bottom <=
(block->line_spacing -
block->line_size) * tesseract::CCStruct::kDescenderFraction) {
//done it
overlap_result = ASSIGN;
dest_row = row;
}
}
else if (near_dist > 0
&& near_dist < bottom - row->max_y ()) {
row_it.backward ();
dest_row = row_it.data ();
if (dest_row->min_y () - bottom <=
(block->line_spacing -
block->line_size) * tesseract::CCStruct::kDescenderFraction) {
//done it
overlap_result = ASSIGN;
}
}
else {
if (top - row->max_y () <=
(block->line_spacing -
block->line_size) * (textord_overlap_x +
tesseract::CCStruct::kAscenderFraction)) {
//done it
overlap_result = ASSIGN;
dest_row = row;
}
}
}
}
if (overlap_result == ASSIGN)
dest_row->add_blob (blob_it.extract (), top, bottom,
block->line_size);
if (overlap_result == NEW_ROW) {
if (make_new_rows && top - bottom < block->max_blob_size) {
dest_row =
new TO_ROW (blob_it.extract (), top, bottom,
block->line_size);
row_count++;
if (bottom > row_it.data ()->min_y ())
row_it.add_before_then_move (dest_row);
//insert in right place
else
row_it.add_after_then_move (dest_row);
smooth_factor =
1.0 / (row_count * textord_skew_lag +
textord_skewsmooth_offset);
}
else
overlap_result = REJECT;
}
}
else if (make_new_rows && top - bottom < block->max_blob_size) {
overlap_result = NEW_ROW;
dest_row =
new TO_ROW (blob_it.extract (), top, bottom, block->line_size);
row_count++;
row_it.add_after_then_move (dest_row);
smooth_factor = 1.0 / (row_count * textord_skew_lag +
textord_skewsmooth_offset2);
}
else
overlap_result = REJECT;
if (blob->bounding_box ().contains (testpt)) {
if (overlap_result != REJECT) {
tprintf ("Test blob assigned to row at (%g,%g) on pass %d\n",
dest_row->min_y (), dest_row->max_y (), pass);
}
else {
tprintf ("Test blob assigned to no row on pass %d\n", pass);
}
}
if (overlap_result != REJECT) {
while (!row_it.at_first ()
&& row_it.data ()->min_y () >
row_it.data_relative (-1)->min_y ()) {
row = row_it.extract ();
row_it.backward ();
row_it.add_before_then_move (row);
}
while (!row_it.at_last ()
&& row_it.data ()->min_y () <
row_it.data_relative (1)->min_y ()) {
row = row_it.extract ();
row_it.forward ();
//keep rows in order
row_it.add_after_then_move (row);
}
block_skew = (1 - smooth_factor) * block_skew
+ smooth_factor * (blob->bounding_box ().bottom () -
dest_row->initial_min_y ());
}
}
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
if (row_it.data ()->blob_list ()->empty ())
delete row_it.extract (); //discard empty rows
}
}

int blob_x_order | ( | const void * | item1,
|  | const void * | item2
| ) |  |

Definition at line 2694 of file makerow.cpp.

{
//converted ptr
BLOBNBOX *blob1 = *(BLOBNBOX **) item1;
//converted ptr
BLOBNBOX *blob2 = *(BLOBNBOX **) item2;
if (blob1->bounding_box ().left () < blob2->bounding_box ().left ())
return -1;
else if (blob1->bounding_box ().left () > blob2->bounding_box ().left ())
return 1;
else
return 0;
}

void cleanup_rows_making | ( | ICOORD | page_tr,
|  | TO_BLOCK * | block,
|  | float | gradient,
|  | FCOORD | rotation,
|  | inT32 | block_edge,
|  | BOOL8 | testing_on
| ) |  |

cleanup_rows_making

Remove overlapping rows and fit all the blobs to what's left.

Definition at line 534 of file makerow.cpp.

{
//iterators
BLOBNBOX_IT blob_it = &block->blobs;
TO_ROW_IT row_it = block->get_rows ();
#ifndef GRAPHICS_DISABLED
if (textord_show_parallel_rows && testing_on) {
if (to_win == NULL)
create_to_win(page_tr);
}
#endif
//get row coords
fit_parallel_rows(block,
gradient,
rotation,
block_edge,
textord_show_parallel_rows &&testing_on);
delete_non_dropout_rows(block,
gradient,
rotation,
block_edge,
textord_show_parallel_rows &&testing_on);
expand_rows(page_tr, block, gradient, rotation, block_edge, testing_on);
blob_it.set_to_list (&block->blobs);
row_it.set_to_list (block->get_rows ());
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ())
blob_it.add_list_after (row_it.data ()->blob_list ());
//give blobs back
assign_blobs_to_rows (block, &gradient, 1, FALSE, FALSE, FALSE);
//now new rows must be genuine
blob_it.set_to_list (&block->blobs);
blob_it.add_list_after (&block->large_blobs);
assign_blobs_to_rows (block, &gradient, 2, TRUE, TRUE, FALSE);
//safe to use big ones now
blob_it.set_to_list (&block->blobs);
//throw all blobs in
blob_it.add_list_after (&block->noise_blobs);
blob_it.add_list_after (&block->small_blobs);
assign_blobs_to_rows (block, &gradient, 3, FALSE, FALSE, FALSE);
}

void compute_dropout_distances | ( | inT32 * | occupation,
|  | inT32 * | thresholds,
|  | inT32 | line_count
| ) |  |

Definition at line 1018 of file makerow.cpp.

{
inT32 line_index; //of thresholds line
inT32 distance; //from prev dropout
inT32 next_dist; //to next dropout
inT32 back_index; //for back filling
inT32 prev_threshold; //before overwrite
distance = -line_count;
line_index = 0;
do {
do {
distance--;
prev_threshold = thresholds[line_index];
//distance from prev
thresholds[line_index] = distance;
line_index++;
}
while (line_index < line_count
&& (occupation[line_index] < thresholds[line_index]
|| occupation[line_index - 1] >= prev_threshold));
if (line_index < line_count) {
back_index = line_index - 1;
next_dist = 1;
while (next_dist < -distance && back_index >= 0) {
thresholds[back_index] = next_dist;
back_index--;
next_dist++;
distance++;
}
distance = 1;
}
}
while (line_index < line_count);
}

inT32 compute_height_modes | ( | STATS * | heights,
|  | inT32 | min_height,
|  | inT32 | max_height,
|  | inT32 * | modes,
|  | inT32 | maxmodes
| ) |  |

Definition at line 1743 of file makerow.cpp.

{ // size of modes
inT32 pile_count; // no in source pile
inT32 src_count; // no of source entries
inT32 src_index; // current entry
inT32 least_count; // height of smalllest
inT32 least_index; // index of least
inT32 dest_count; // index in modes
src_count = max_height + 1 - min_height;
dest_count = 0;
least_count = MAX_INT32;
least_index = -1;
for (src_index = 0; src_index < src_count; src_index++) {
pile_count = heights->pile_count(min_height + src_index);
if (pile_count > 0) {
if (dest_count < maxmodes) {
if (pile_count < least_count) {
// find smallest in array
least_count = pile_count;
least_index = dest_count;
}
modes[dest_count++] = min_height + src_index;
} else if (pile_count >= least_count) {
while (least_index < maxmodes - 1) {
modes[least_index] = modes[least_index + 1];
// shuffle up
least_index++;
}
// new one on end
modes[maxmodes - 1] = min_height + src_index;
if (pile_count == least_count) {
// new smallest
least_index = maxmodes - 1;
} else {
least_count = heights->pile_count(modes[0]);
least_index = 0;
for (dest_count = 1; dest_count < maxmodes; dest_count++) {
pile_count = heights->pile_count(modes[dest_count]);
if (pile_count < least_count) {
// find smallest
least_count = pile_count;
least_index = dest_count;
}
}
}
}
}
}
return dest_count;
}

void compute_line_occupation | ( | TO_BLOCK * | block,
|  | float | gradient,
|  | inT32 | min_y,
|  | inT32 | max_y,
|  | inT32 * | occupation,
|  | inT32 * | deltas
| ) |  |

Definition at line 871 of file makerow.cpp.

{
inT32 line_count; //maxy-miny+1
inT32 line_index; //of scan line
int index; //array index for daft compilers
float top, bottom; //coords of blob
inT32 width; //of blob
TO_ROW *row; //current row
TO_ROW_IT row_it = block->get_rows ();
BLOBNBOX *blob; //current blob
BLOBNBOX_IT blob_it; //iterator
float length; //of skew vector
TBOX blob_box; //bounding box
FCOORD rotation; //inverse of skew
line_count = max_y - min_y + 1;
length = sqrt (gradient * gradient + 1);
rotation = FCOORD (1 / length, -gradient / length);
for (line_index = 0; line_index < line_count; line_index++)
deltas[line_index] = 0;
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
blob_it.set_to_list (row->blob_list ());
for (blob_it.mark_cycle_pt (); !blob_it.cycled_list ();
blob_it.forward ()) {
blob = blob_it.data ();
blob_box = blob->bounding_box ();
blob_box.rotate (rotation);//de-skew it
top = blob_box.top ();
bottom = blob_box.bottom ();
width =
(inT32) floor ((FLOAT32) (blob_box.right () - blob_box.left ()));
if ((inT32) floor (bottom) < min_y
|| (inT32) floor (bottom) - min_y >= line_count)
fprintf (stderr,
"Bad y coord of bottom, " INT32FORMAT "(" INT32FORMAT ","
INT32FORMAT ")\n", (inT32) floor (bottom), min_y, max_y);
//count transitions
index = (inT32) floor (bottom) - min_y;
deltas[index] += width;
if ((inT32) floor (top) < min_y
|| (inT32) floor (top) - min_y >= line_count)
fprintf (stderr,
"Bad y coord of top, " INT32FORMAT "(" INT32FORMAT ","
INT32FORMAT ")\n", (inT32) floor (top), min_y, max_y);
index = (inT32) floor (top) - min_y;
deltas[index] -= width;
}
}
occupation[0] = deltas[0];
for (line_index = 1; line_index < line_count; line_index++)
occupation[line_index] = occupation[line_index - 1] + deltas[line_index];
}

void compute_occupation_threshold | ( | inT32 | low_window,
|  | inT32 | high_window,
|  | inT32 | line_count,
|  | inT32 * | occupation,
|  | inT32 * | thresholds
| ) |  |

compute_occupation_threshold

Compute thresholds for textline or not for the occupation array.

Definition at line 937 of file makerow.cpp.

{
inT32 line_index; //of thresholds line
inT32 low_index; //in occupation
inT32 high_index; //in occupation
inT32 sum; //current average
inT32 divisor; //to get thresholds
inT32 min_index; //of min occ
inT32 min_occ; //min in locality
inT32 test_index; //for finding min
divisor =
(inT32) ceil ((low_window + high_window) / textord_occupancy_threshold);
if (low_window + high_window < line_count) {
for (sum = 0, high_index = 0; high_index < low_window; high_index++)
sum += occupation[high_index];
for (low_index = 0; low_index < high_window; low_index++, high_index++)
sum += occupation[high_index];
min_occ = occupation[0];
min_index = 0;
for (test_index = 1; test_index < high_index; test_index++) {
if (occupation[test_index] <= min_occ) {
min_occ = occupation[test_index];
min_index = test_index; //find min in region
}
}
for (line_index = 0; line_index < low_window; line_index++)
thresholds[line_index] = (sum - min_occ) / divisor + min_occ;
//same out to end
for (low_index = 0; high_index < line_count; low_index++, high_index++) {
sum -= occupation[low_index];
sum += occupation[high_index];
if (occupation[high_index] <= min_occ) {
//find min in region
min_occ = occupation[high_index];
min_index = high_index;
}
//lost min from region
if (min_index <= low_index) {
min_occ = occupation[low_index + 1];
min_index = low_index + 1;
for (test_index = low_index + 2; test_index <= high_index;
test_index++) {
if (occupation[test_index] <= min_occ) {
min_occ = occupation[test_index];
//find min in region
min_index = test_index;
}
}
}
thresholds[line_index++] = (sum - min_occ) / divisor + min_occ;
}
}
else {
min_occ = occupation[0];
min_index = 0;
for (sum = 0, low_index = 0; low_index < line_count; low_index++) {
if (occupation[low_index] < min_occ) {
min_occ = occupation[low_index];
min_index = low_index;
}
sum += occupation[low_index];
}
line_index = 0;
}
for (; line_index < line_count; line_index++)
thresholds[line_index] = (sum - min_occ) / divisor + min_occ;
//same out to end
}

void compute_page_skew | ( | TO_BLOCK_LIST * | blocks,
|  | float & | page_m,
|  | float & | page_err
| ) |  |

Definition at line 296 of file makerow.cpp.

{
inT32 row_count; //total rows
inT32 blob_count; //total_blobs
inT32 row_err; //integer error
float *gradients; //of rows
float *errors; //of rows
inT32 row_index; //of total
TO_ROW *row; //current row
TO_BLOCK_IT block_it = blocks; //iterator
TO_ROW_IT row_it;
row_count = 0;
blob_count = 0;
for (block_it.mark_cycle_pt (); !block_it.cycled_list ();
block_it.forward ()) {
POLY_BLOCK* pb = block_it.data()->block->poly_block();
if (pb != NULL && !pb->IsText())
continue; // Pretend non-text blocks don't exist.
row_count += block_it.data ()->get_rows ()->length ();
//count up rows
row_it.set_to_list (block_it.data ()->get_rows ());
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ())
blob_count += row_it.data ()->blob_list ()->length ();
}
if (row_count == 0) {
page_m = 0.0f;
page_err = 0.0f;
return;
}
gradients = (float *) alloc_mem (blob_count * sizeof (float));
//get mem
errors = (float *) alloc_mem (blob_count * sizeof (float));
if (gradients == NULL || errors == NULL)
MEMORY_OUT.error ("compute_page_skew", ABORT, NULL);
row_index = 0;
for (block_it.mark_cycle_pt (); !block_it.cycled_list ();
block_it.forward ()) {
POLY_BLOCK* pb = block_it.data()->block->poly_block();
if (pb != NULL && !pb->IsText())
continue; // Pretend non-text blocks don't exist.
row_it.set_to_list (block_it.data ()->get_rows ());
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
blob_count = row->blob_list ()->length ();
row_err = (inT32) ceil (row->line_error ());
if (row_err <= 0)
row_err = 1;
if (textord_biased_skewcalc) {
blob_count /= row_err;
for (blob_count /= row_err; blob_count > 0; blob_count--) {
gradients[row_index] = row->line_m ();
errors[row_index] = row->line_error ();
row_index++;
}
}
else if (blob_count >= textord_min_blobs_in_row) {
//get gradient
gradients[row_index] = row->line_m ();
errors[row_index] = row->line_error ();
row_index++;
}
}
}
if (row_index == 0) {
//desperate
for (block_it.mark_cycle_pt (); !block_it.cycled_list ();
block_it.forward ()) {
POLY_BLOCK* pb = block_it.data()->block->poly_block();
if (pb != NULL && !pb->IsText())
continue; // Pretend non-text blocks don't exist.
row_it.set_to_list (block_it.data ()->get_rows ());
for (row_it.mark_cycle_pt (); !row_it.cycled_list ();
row_it.forward ()) {
row = row_it.data ();
gradients[row_index] = row->line_m ();
errors[row_index] = row->line_error ();
row_index++;
}
}
}
row_count = row_index;
row_index = choose_nth_item ((inT32) (row_count * textord_skew_ile),
gradients, row_count);
page_m = gradients[row_index];
row_index = choose_nth_item ((inT32) (row_count * textord_skew_ile),
errors, row_count);
page_err = errors[row_index];
free_mem(gradients);
free_mem(errors);
}

inT32 compute_row_descdrop | ( | TO_ROW * | row,
|  | float | gradient,
|  | int | xheight_blob_count,
|  | STATS * | asc_heights
| ) |  |

Definition at line 1683 of file makerow.cpp.

{
// Count how many potential ascenders are in this row.
int i_min = asc_heights->min_bucket();
if ((i_min / row->xheight) < textord_ascx_ratio_min) {
i_min = static_cast<int>(
floor(row->xheight * textord_ascx_ratio_min + 0.5));
}
int i_max = asc_heights->max_bucket();
if ((i_max / row->xheight) > textord_ascx_ratio_max) {
i_max = static_cast<int>(floor(row->xheight * textord_ascx_ratio_max));
}
int num_potential_asc = 0;
for (int i = i_min; i <= i_max; ++i) {
num_potential_asc += asc_heights->pile_count(i);
}
inT32 min_height =
static_cast<inT32>(floor(row->xheight * textord_descx_ratio_min + 0.5));
inT32 max_height =
static_cast<inT32>(floor(row->xheight * textord_descx_ratio_max));
float xcentre; // centre of blob
float height; // height of blob
BLOBNBOX_IT blob_it = row->blob_list();
BLOBNBOX *blob; // current blob
STATS heights (min_height, max_height + 1);
for (blob_it.mark_cycle_pt(); !blob_it.cycled_list(); blob_it.forward()) {
blob = blob_it.data();
if (!blob->joined_to_prev()) {
xcentre = (blob->bounding_box().left() +
blob->bounding_box().right()) / 2.0f;
height = (gradient * xcentre + row->parallel_c() -
blob->bounding_box().bottom());
if (height >= min_height && height <= max_height)
heights.add(static_cast<int>(floor(height + 0.5)), 1);
}
}
int blob_index = heights.mode(); // find mode
int blob_count = heights.pile_count(blob_index); // get count of mode
float total_fraction =
(textord_descheight_mode_fraction + textord_ascheight_mode_fraction);
if (static_cast<float>(blob_count + num_potential_asc) <
xheight_blob_count * total_fraction) {
blob_count = 0;
}
int descdrop = blob_count > 0 ? -blob_index : 0;
if (textord_debug_xheights) {
tprintf("Descdrop: %d (potential ascenders %d, descenders %d)\n",
descdrop, num_potential_asc, blob_count);
heights.print();
}
return descdrop;
}

void compute_row_stats | ( | TO_BLOCK * | block,
|  | BOOL8 | testing_on
| ) |  |

Definition at line 1259 of file makerow.cpp.

{
inT32 row_index; //of median
TO_ROW *row; //current row
TO_ROW *prev_row; //previous row
float iqr; //inter quartile range
TO_ROW_IT row_it = block->get_rows ();
//number of rows
inT16 rowcount = row_it.length ();
TO_ROW **rows; //for choose nth
rows = (TO_ROW **) alloc_mem (rowcount * sizeof (TO_ROW *));
if (rows == NULL)
MEMORY_OUT.error ("compute_row_stats", ABORT, NULL);
rowcount = 0;
prev_row = NULL;
row_it.move_to_last (); //start at bottom
do {
row = row_it.data ();
if (prev_row != NULL) {
rows[rowcount++] = prev_row;
prev_row->spacing = row->intercept () - prev_row->intercept ();
if (testing_on)
tprintf ("Row at %g yields spacing of %g\n",
row->intercept (), prev_row->spacing);
}
prev_row = row;
row_it.backward ();
}
while (!row_it.at_last ());
block->key_row = prev_row;
block->baseline_offset =
fmod (prev_row->parallel_c (), block->line_spacing);
if (testing_on)
tprintf ("Blob based spacing=(%g,%g), offset=%g",
block->line_size, block->line_spacing, block->baseline_offset);
if (rowcount > 0) {
row_index = choose_nth_item (rowcount * 3 / 4, rows, rowcount,
sizeof (TO_ROW *), row_spacing_order);
iqr = rows[row_index]->spacing;
row_index = choose_nth_item (rowcount / 4, rows, rowcount,
sizeof (TO_ROW *), row_spacing_order);
iqr -= rows[row_index]->spacing;
row_index = choose_nth_item (rowcount / 2, rows, rowcount,
sizeof (TO_ROW *), row_spacing_order);
block->key_row = rows[row_index];
if (testing_on)
tprintf (" row based=%g(%g)", rows[row_index]->spacing, iqr);
if (rowcount > 2
&& iqr < rows[row_index]->spacing * textord_linespace_iqrlimit) {
if (!textord_new_initial_xheight) {
if (rows[row_index]->spacing < block->line_spacing
&& rows[row_index]->spacing > block->line_size)
//within range
block->line_size = rows[row_index]->spacing;
//spacing=size
else if (rows[row_index]->spacing > block->line_spacing)
block->line_size = block->line_spacing;
//too big so use max
}
else {
if (rows[row_index]->spacing < block->line_spacing)
block->line_size = rows[row_index]->spacing;
else
block->line_size = block->line_spacing;
//too big so use max
}
if (block->line_size < textord_min_xheight)
block->line_size = (float) textord_min_xheight;
block->line_spacing = rows[row_index]->spacing;
block->max_blob_size =
block->line_spacing * textord_excess_blobsize;
}
block->baseline_offset = fmod (rows[row_index]->intercept (),
block->line_spacing);
}
if (testing_on)
tprintf ("\nEstimate line size=%g, spacing=%g, offset=%g\n",
block->line_size, block->line_spacing, block->baseline_offset);
free_mem(rows);
}

int compute_xheight_from_modes | ( | STATS * | heights,
|  | STATS * | floating_heights,
|  | bool | cap_only,
|  | int | min_height,
|  | int | max_height,
|  | float * | xheight,
|  | float * | ascrise
| ) |  |

Definition at line 1587 of file makerow.cpp.

{
int blob_index = heights->mode(); // find mode
int blob_count = heights->pile_count(blob_index); // get count of mode
if (textord_debug_xheights) {
tprintf("min_height=%d, max_height=%d, mode=%d, count=%d, total=%d\n",
min_height, max_height, blob_index, blob_count,
heights->get_total());
heights->print();
floating_heights->print();
}
if (blob_count == 0) return 0;
int modes[MAX_HEIGHT_MODES]; // biggest piles
bool in_best_pile = FALSE;
int prev_size = -MAX_INT32;
int best_count = 0;
int mode_count = compute_height_modes(heights, min_height, max_height,
modes, MAX_HEIGHT_MODES);
if (cap_only && mode_count > 1)
mode_count = 1;
int x;
if (textord_debug_xheights) {
tprintf("found %d modes: ", mode_count);
for (x = 0; x < mode_count; x++) tprintf("%d ", modes[x]);
tprintf("\n");
}
for (x = 0; x < mode_count - 1; x++) {
if (modes[x] != prev_size + 1)
in_best_pile = FALSE; // had empty height
int modes_x_count = heights->pile_count(modes[x]) -
floating_heights->pile_count(modes[x]);
if ((modes_x_count >= blob_count * textord_xheight_mode_fraction) &&
(in_best_pile || modes_x_count > best_count)) {
for (int asc = x + 1; asc < mode_count; asc++) {
float ratio =
static_cast<float>(modes[asc]) / static_cast<float>(modes[x]);
if (textord_ascx_ratio_min < ratio &&
ratio < textord_ascx_ratio_max &&
(heights->pile_count(modes[asc]) >=
blob_count * textord_ascheight_mode_fraction)) {
if (modes_x_count > best_count) {
in_best_pile = true;
best_count = modes_x_count;
}
if (textord_debug_xheights) {
tprintf("X=%d, asc=%d, count=%d, ratio=%g\n",
modes[x], modes[asc]-modes[x], modes_x_count, ratio);
}
prev_size = modes[x];
*xheight = static_cast<float>(modes[x]);
*ascrise = static_cast<float>(modes[asc] - modes[x]);
}
}
}
}
if (*xheight == 0) { // single mode
// Remove counts of the "floating" blobs (the one whose height is too
// small in relation to it's top end of the bounding box) from heights
// before computing the single-mode xheight.
// Restore the counts in heights after the mode is found, since
// floating blobs might be useful for determining potential ascenders
// in compute_row_descdrop().
if (floating_heights->get_total() > 0) {
for (x = min_height; x < max_height; ++x) {
heights->add(x, -(floating_heights->pile_count(x)));
}
blob_index = heights->mode(); // find the modified mode
for (x = min_height; x < max_height; ++x) {
heights->add(x, floating_heights->pile_count(x));
}
}
*xheight = static_cast<float>(blob_index);
*ascrise = 0.0f;
best_count = heights->pile_count(blob_index);
if (textord_debug_xheights)
tprintf("Single mode xheight set to %g\n", *xheight);
} else if (textord_debug_xheights) {
tprintf("Multi-mode xheight set to %g, asc=%g\n", *xheight, *ascrise);
}
return best_count;
}

void correct_row_xheight | ( | TO_ROW * | row,
|  | float | xheight,
|  | float | ascrise,
|  | float | descdrop
| ) |  |

Definition at line 1805 of file makerow.cpp.

{
ROW_CATEGORY row_category = get_row_category(row);
if (textord_debug_xheights) {
tprintf("correcting row xheight: row->xheight %.4f"
", row->acrise %.4f row->descdrop %.4f\n",
row->xheight, row->ascrise, row->descdrop);
}
bool normal_xheight =
within_error_margin(row->xheight, xheight, textord_xheight_error_margin);
bool cap_xheight =
within_error_margin(row->xheight, xheight + ascrise,
textord_xheight_error_margin);
// Use the average xheight/ascrise for the following cases:
// -- the xheight of the row could not be determined at all
// -- the row has descenders (e.g. "many groups", "ISBN 12345 p.3")
// and its xheight is close to either cap height or average xheight
// -- the row does not have ascenders or descenders, but its xheight
// is close to the average block xheight (e.g. row with "www.mmm.com")
if (row_category == ROW_ASCENDERS_FOUND) {
if (row->descdrop >= 0.0) {
row->descdrop = row->xheight * (descdrop / xheight);
}
} else if (row_category == ROW_INVALID ||
(row_category == ROW_DESCENDERS_FOUND &&
(normal_xheight || cap_xheight)) ||
(row_category == ROW_UNKNOWN && normal_xheight)) {
if (textord_debug_xheights) tprintf("using average xheight\n");
row->xheight = xheight;
row->ascrise = ascrise;
row->descdrop = descdrop;
} else if (row_category == ROW_DESCENDERS_FOUND) {
// Assume this is a row with mostly lowercase letters and it's xheight
// is computed correctly (unfortunately there is no way to distinguish
// this from the case when descenders are found, but the most common
// height is capheight).
if (textord_debug_xheights) tprintf("lowercase, corrected ascrise\n");
row->ascrise = row->xheight * (ascrise / xheight);
} else if (row_category == ROW_UNKNOWN) {
// Otherwise assume this row is an all-caps or small-caps row
// and adjust xheight and ascrise of the row.
row->all_caps = true;
if (cap_xheight) { // regular all caps
if (textord_debug_xheights) tprintf("all caps\n");
row->xheight = xheight;
row->ascrise = ascrise;
row->descdrop = descdrop;
} else { // small caps or caps with an odd xheight
if (textord_debug_xheights) {
if (row->xheight < xheight + ascrise && row->xheight > xheight) {
tprintf("small caps\n");
} else {
tprintf("all caps with irregular xheight\n");
}
}
row->ascrise = row->xheight * (ascrise / (xheight + ascrise));
row->xheight -= row->ascrise;
row->descdrop = row->xheight * (descdrop / xheight);
}
}
if (textord_debug_xheights) {
tprintf("corrected row->xheight = %.4f, row->acrise = %.4f, row->descdrop"
" = %.4f\n", row->xheight, row->ascrise, row->descdrop);
}
}

void delete_non_dropout_rows | ( | TO_BLOCK * | block,
|  | float | gradient,
|  | FCOORD | rotation,
|  | inT32 | block_edge,
|  | BOOL8 | testing_on
| ) |  |

delete_non_dropout_rows

Compute the linespacing and offset.

Definition at line 667 of file makerow.cpp.

{
TBOX block_box; //deskewed block
inT32 *deltas; //change in occupation
inT32 *occupation; //of pixel coords
inT32 max_y; //in block
inT32 min_y;
inT32 line_index; //of scan line
inT32 line_count; //no of scan lines
inT32 distance; //to drop-out
inT32 xleft; //of block
inT32 ybottom; //of block
TO_ROW *row; //current row
TO_ROW_IT row_it = block->get_rows ();
BLOBNBOX_IT blob_it = &block->blobs;
if (row_it.length () == 0)
return; //empty block
block_box = deskew_block_coords (block, gradient);
xleft = block->block->bounding_box ().left ();
ybottom = block->block->bounding_box ().bottom ();
min_y = block_box.bottom () - 1;
max_y = block_box.top () + 1;
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
line_index = (inT32) floor (row_it.data ()->intercept ());
if (line_index <= min_y)
min_y = line_index - 1;
if (line_index >= max_y)
max_y = line_index + 1;
}
line_count = max_y - min_y + 1;
if (line_count <= 0)
return; //empty block
deltas = (inT32 *) alloc_mem (line_count * sizeof (inT32));
occupation = (inT32 *) alloc_mem (line_count * sizeof (inT32));
if (deltas == NULL || occupation == NULL)
MEMORY_OUT.error ("compute_line_spacing", ABORT, NULL);
compute_line_occupation(block, gradient, min_y, max_y, occupation, deltas);
compute_occupation_threshold ((inT32)
ceil (block->line_spacing *
(tesseract::CCStruct::kDescenderFraction +
tesseract::CCStruct::kAscenderFraction)),
(inT32) ceil (block->line_spacing *
(tesseract::CCStruct::kXHeightFraction +
tesseract::CCStruct::kAscenderFraction)),
max_y - min_y + 1, occupation, deltas);
#ifndef GRAPHICS_DISABLED
if (testing_on) {
draw_occupation(xleft, ybottom, min_y, max_y, occupation, deltas);
}
#endif
compute_dropout_distances(occupation, deltas, line_count);
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
line_index = (inT32) floor (row->intercept ());
distance = deltas[line_index - min_y];
if (find_best_dropout_row (row, distance, block->line_spacing / 2,
line_index, &row_it, testing_on)) {
#ifndef GRAPHICS_DISABLED
if (testing_on)
plot_parallel_row(row, gradient, block_edge,
ScrollView::WHITE, rotation);
#endif
blob_it.add_list_after (row_it.data ()->blob_list ());
delete row_it.extract (); //too far away
}
}
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
blob_it.add_list_after (row_it.data ()->blob_list ());
}
free_mem(deltas);
free_mem(occupation);
}

TBOX deskew_block_coords | ( | TO_BLOCK * | block,
|  | float | gradient
| ) |  |

Definition at line 835 of file makerow.cpp.

{
TBOX result; //block bounds
TBOX blob_box; //of block
FCOORD rotation; //deskew vector
float length; //of gradient vector
TO_ROW_IT row_it = block->get_rows ();
TO_ROW *row; //current row
BLOBNBOX *blob; //current blob
BLOBNBOX_IT blob_it; //iterator
length = sqrt (gradient * gradient + 1);
rotation = FCOORD (1 / length, -gradient / length);
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
row = row_it.data ();
blob_it.set_to_list (row->blob_list ());
for (blob_it.mark_cycle_pt (); !blob_it.cycled_list ();
blob_it.forward ()) {
blob = blob_it.data ();
blob_box = blob->bounding_box ();
blob_box.rotate (rotation);//de-skew it
result += blob_box;
}
}
return result;
}

void expand_rows | ( | ICOORD | page_tr,
|  | TO_BLOCK * | block,
|  | float | gradient,
|  | FCOORD | rotation,
|  | inT32 | block_edge,
|  | BOOL8 | testing_on
| ) |  |

Definition at line 1065 of file makerow.cpp.

{
BOOL8 swallowed_row; //eaten a neighbour
float y_max, y_min; //new row limits
float y_bottom, y_top; //allowed limits
TO_ROW *test_row; //next row
TO_ROW *row; //current row
//iterators
BLOBNBOX_IT blob_it = &block->blobs;
TO_ROW_IT row_it = block->get_rows ();
#ifndef GRAPHICS_DISABLED
if (textord_show_expanded_rows && testing_on) {
if (to_win == NULL)
create_to_win(page_tr);
}
#endif
adjust_row_limits(block); //shift min,max.
if (textord_new_initial_xheight) {
if (block->get_rows ()->length () == 0)
return;
compute_row_stats(block, textord_show_expanded_rows &&testing_on);
}
assign_blobs_to_rows (block, &gradient, 4, TRUE, FALSE, FALSE);
//get real membership
if (block->get_rows ()->length () == 0)
return;
fit_parallel_rows(block,
gradient,
rotation,
block_edge,
textord_show_expanded_rows &&testing_on);
if (!textord_new_initial_xheight)
compute_row_stats(block, textord_show_expanded_rows &&testing_on);
row_it.move_to_last ();
do {
row = row_it.data ();
y_max = row->max_y (); //get current limits
y_min = row->min_y ();
y_bottom = row->intercept () - block->line_size * textord_expansion_factor *
tesseract::CCStruct::kDescenderFraction;
y_top = row->intercept () + block->line_size * textord_expansion_factor *
(tesseract::CCStruct::kXHeightFraction +
tesseract::CCStruct::kAscenderFraction);
if (y_min > y_bottom) { //expansion allowed
if (textord_show_expanded_rows && testing_on)
tprintf("Expanding bottom of row at %f from %f to %f\n",
row->intercept(), y_min, y_bottom);
//expandable
swallowed_row = TRUE;
while (swallowed_row && !row_it.at_last ()) {
swallowed_row = FALSE;
//get next one
test_row = row_it.data_relative (1);
//overlaps space
if (test_row->max_y () > y_bottom) {
if (test_row->min_y () > y_bottom) {
if (textord_show_expanded_rows && testing_on)
tprintf("Eating row below at %f\n", test_row->intercept());
row_it.forward ();
#ifndef GRAPHICS_DISABLED
if (textord_show_expanded_rows && testing_on)
plot_parallel_row(test_row,
gradient,
block_edge,
ScrollView::WHITE,
rotation);
#endif
blob_it.set_to_list (row->blob_list ());
blob_it.add_list_after (test_row->blob_list ());
//swallow complete row
delete row_it.extract ();
row_it.backward ();
swallowed_row = TRUE;
}
else if (test_row->max_y () < y_min) {
//shorter limit
y_bottom = test_row->max_y ();
if (textord_show_expanded_rows && testing_on)
tprintf("Truncating limit to %f due to touching row at %f\n",
y_bottom, test_row->intercept());
}
else {
y_bottom = y_min; //can't expand it
if (textord_show_expanded_rows && testing_on)
tprintf("Not expanding limit beyond %f due to touching row at %f\n",
y_bottom, test_row->intercept());
}
}
}
y_min = y_bottom; //expand it
}
if (y_max < y_top) { //expansion allowed
if (textord_show_expanded_rows && testing_on)
tprintf("Expanding top of row at %f from %f to %f\n",
row->intercept(), y_max, y_top);
swallowed_row = TRUE;
while (swallowed_row && !row_it.at_first ()) {
swallowed_row = FALSE;
//get one above
test_row = row_it.data_relative (-1);
if (test_row->min_y () < y_top) {
if (test_row->max_y () < y_top) {
if (textord_show_expanded_rows && testing_on)
tprintf("Eating row above at %f\n", test_row->intercept());
row_it.backward ();
blob_it.set_to_list (row->blob_list ());
#ifndef GRAPHICS_DISABLED
if (textord_show_expanded_rows && testing_on)
plot_parallel_row(test_row,
gradient,
block_edge,
ScrollView::WHITE,
rotation);
#endif
blob_it.add_list_after (test_row->blob_list ());
//swallow complete row
delete row_it.extract ();
row_it.forward ();
swallowed_row = TRUE;
}
else if (test_row->min_y () < y_max) {
//shorter limit
y_top = test_row->min_y ();
if (textord_show_expanded_rows && testing_on)
tprintf("Truncating limit to %f due to touching row at %f\n",
y_top, test_row->intercept());
}
else {
y_top = y_max; //can't expand it
if (textord_show_expanded_rows && testing_on)
tprintf("Not expanding limit beyond %f due to touching row at %f\n",
y_top, test_row->intercept());
}
}
}
y_max = y_top;
}
//new limits
row->set_limits (y_min, y_max);
row_it.backward ();
}
while (!row_it.at_last ());
}

void fill_heights | ( | TO_ROW * | row,
|  | float | gradient,
|  | int | min_height,
|  | int | max_height,
|  | STATS * | heights,
|  | STATS * | floating_heights
| ) |  |

Definition at line 1526 of file makerow.cpp.

{
float xcentre; // centre of blob
float top; // top y coord of blob
float height; // height of blob
BLOBNBOX *blob; // current blob
int repeated_set;
BLOBNBOX_IT blob_it = row->blob_list();
if (blob_it.empty()) return; // no blobs in this row
bool has_rep_chars =
row->rep_chars_marked() && row->num_repeated_sets() > 0;
do {
blob = blob_it.data();
if (!blob->joined_to_prev()) {
xcentre = (blob->bounding_box().left() +
blob->bounding_box().right()) / 2.0f;
top = blob->bounding_box().top();
height = blob->bounding_box().height();
if (textord_fix_xheight_bug)
top -= row->baseline.y(xcentre);
else
top -= gradient * xcentre + row->parallel_c();
if (top >= min_height && top <= max_height) {
heights->add(static_cast<inT32>(floor(top + 0.5)), 1);
if (height / top < textord_min_blob_height_fraction) {
floating_heights->add(static_cast<inT32>(floor(top + 0.5)), 1);
}
}
}
// Skip repeated chars, since they are likely to skew the height stats.
if (has_rep_chars && blob->repeated_set() != 0) {
repeated_set = blob->repeated_set();
blob_it.forward();
while (!blob_it.at_first() &&
blob_it.data()->repeated_set() == repeated_set) {
blob_it.forward();
if (textord_debug_xheights)
tprintf("Skipping repeated char when computing xheight\n");
}
} else {
blob_it.forward();
}
} while (!blob_it.at_first());
}

BOOL8 find_best_dropout_row | ( | TO_ROW * | row,
|  | inT32 | distance,
|  | float | dist_limit,
|  | inT32 | line_index,
|  | TO_ROW_IT * | row_it,
|  | BOOL8 | testing_on
| ) |  |

Definition at line 755 of file makerow.cpp.

{
inT32 next_index; //of neigbouring row
inT32 row_offset; //from current row
inT32 abs_dist; //absolute distance
inT8 row_inc; //increment to row_index
TO_ROW *next_row; //nextious row
if (testing_on)
tprintf ("Row at %g(%g), dropout dist=%d,",
row->intercept (), row->parallel_c (), distance);
if (distance < 0) {
row_inc = 1;
abs_dist = -distance;
}
else {
row_inc = -1;
abs_dist = distance;
}
if (abs_dist > dist_limit) {
if (testing_on) {
tprintf (" too far - deleting\n");
}
return TRUE;
}
if ((distance < 0 && !row_it->at_last ())
|| (distance >= 0 && !row_it->at_first ())) {
row_offset = row_inc;
do {
next_row = row_it->data_relative (row_offset);
next_index = (inT32) floor (next_row->intercept ());
if ((distance < 0
&& next_index < line_index
&& next_index > line_index + distance + distance)
|| (distance >= 0
&& next_index > line_index
&& next_index < line_index + distance + distance)) {
if (testing_on) {
tprintf (" nearer neighbour (%d) at %g\n",
line_index + distance - next_index,
next_row->intercept ());
}
return TRUE; //other is nearer
}
else if (next_index == line_index
|| next_index == line_index + distance + distance) {
if (row->believability () <= next_row->believability ()) {
if (testing_on) {
tprintf (" equal but more believable at %g (%g/%g)\n",
next_row->intercept (),
row->believability (),
next_row->believability ());
}
return TRUE; //other is more believable
}
}
row_offset += row_inc;
}
while ((next_index == line_index
|| next_index == line_index + distance + distance)
&& row_offset < row_it->length ());
if (testing_on)
tprintf (" keeping\n");
}
return FALSE;
}

void fit_lms_line | ( | TO_ROW * | row | ) |

Definition at line 276 of file makerow.cpp.

{
float m, c; // fitted line
tesseract::DetLineFit lms;
BLOBNBOX_IT blob_it = row->blob_list();
for (blob_it.mark_cycle_pt(); !blob_it.cycled_list(); blob_it.forward()) {
const TBOX& box = blob_it.data()->bounding_box();
lms.Add(ICOORD((box.left() + box.right()) / 2, box.bottom()));
}
double error = lms.Fit(&m, &c);
row->set_line(m, c, error);
}

void fit_parallel_lms | ( | float | gradient,
|  | TO_ROW * | row
| ) |  |

Definition at line 2093 of file makerow.cpp.

{
float c; // fitted line
int blobcount; // no of blobs
tesseract::DetLineFit lms;
BLOBNBOX_IT blob_it = row->blob_list();
blobcount = 0;
for (blob_it.mark_cycle_pt(); !blob_it.cycled_list(); blob_it.forward()) {
if (!blob_it.data()->joined_to_prev()) {
const TBOX& box = blob_it.data()->bounding_box();
lms.Add(ICOORD((box.left() + box.right()) / 2, box.bottom()));
blobcount++;
}
}
double error = lms.ConstrainedFit(gradient, &c);
row->set_parallel_line(gradient, c, error);
if (textord_straight_baselines && blobcount > textord_lms_line_trials) {
error = lms.Fit(&gradient, &c);
}
//set the other too
row->set_line(gradient, c, error);
}

void fit_parallel_rows | ( | TO_BLOCK * | block,
|  | float | gradient,
|  | FCOORD | rotation,
|  | inT32 | block_edge,
|  | BOOL8 | testing_on
| ) |  |

Definition at line 2051 of file makerow.cpp.

{
#ifndef GRAPHICS_DISABLED
ScrollView::Color colour; //of row
#endif
TO_ROW_IT row_it = block->get_rows ();
row_it.move_to_first ();
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
if (row_it.data ()->blob_list ()->empty ())
delete row_it.extract (); //nothing in it
else
fit_parallel_lms (gradient, row_it.data ());
}
#ifndef GRAPHICS_DISABLED
if (testing_on) {
colour = ScrollView::RED;
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
plot_parallel_row (row_it.data (), gradient,
block_edge, colour, rotation);
colour = (ScrollView::Color) (colour + 1);
if (colour > ScrollView::MAGENTA)
colour = ScrollView::RED;
}
}
#endif
row_it.sort (row_y_order); //may have gone out of order
}

double* linear_spline_baseline | ( | TO_ROW * | row,
|  | TO_BLOCK * | block,
|  | inT32 & | segments,
|  | inT32 | xstarts[]
| ) |  |

Definition at line 2311 of file makerow.cpp.

{
int blobcount; //no of blobs
int blobindex; //current blob
int index1, index2; //blob numbers
int blobs_per_segment; //blobs in each
TBOX box; //blob box
TBOX new_box; //new_it box
//blobs
BLOBNBOX_IT blob_it = row->blob_list ();
BLOBNBOX_IT new_it = blob_it; //front end
float b, c; //fitted curve
tesseract::DetLineFit lms;
double *coeffs; //quadratic coeffs
inT32 segment; //current segment
box = box_next_pre_chopped (&blob_it);
xstarts[0] = box.left ();
blobcount = 1;
while (!blob_it.at_first ()) {
blobcount++;
box = box_next_pre_chopped (&blob_it);
}
segments = blobcount / textord_spline_medianwin;
if (segments < 1)
segments = 1;
blobs_per_segment = blobcount / segments;
coeffs = (double *) alloc_mem (segments * 3 * sizeof (double));
if (textord_oldbl_debug)
tprintf
("Linear splining baseline of %d blobs at (%d,%d), into %d segments of %d blobs\n",
blobcount, box.left (), box.bottom (), segments, blobs_per_segment);
segment = 1;
for (index2 = 0; index2 < blobs_per_segment / 2; index2++)
box_next_pre_chopped(&new_it);
index1 = 0;
blobindex = index2;
do {
blobindex += blobs_per_segment;
lms.Clear();
while (index1 < blobindex || (segment == segments && index1 < blobcount)) {
box = box_next_pre_chopped (&blob_it);
int middle = (box.left() + box.right()) / 2;
lms.Add(ICOORD(middle, box.bottom()));
index1++;
if (index1 == blobindex - blobs_per_segment / 2
|| index1 == blobcount - 1) {
xstarts[segment] = box.left ();
}
}
lms.Fit(&b, &c);
coeffs[segment * 3 - 3] = 0;
coeffs[segment * 3 - 2] = b;
coeffs[segment * 3 - 1] = c;
segment++;
if (segment > segments)
break;
blobindex += blobs_per_segment;
lms.Clear();
while (index2 < blobindex || (segment == segments && index2 < blobcount)) {
new_box = box_next_pre_chopped (&new_it);
int middle = (new_box.left() + new_box.right()) / 2;
lms.Add(ICOORD (middle, new_box.bottom()));
index2++;
if (index2 == blobindex - blobs_per_segment / 2
|| index2 == blobcount - 1) {
xstarts[segment] = new_box.left ();
}
}
lms.Fit(&b, &c);
coeffs[segment * 3 - 3] = 0;
coeffs[segment * 3 - 2] = b;
coeffs[segment * 3 - 1] = c;
segment++;
}
while (segment <= segments);
return coeffs;
}

void make_baseline_spline | ( | TO_ROW * | row,
|  | TO_BLOCK * | block
| ) |  |

Definition at line 2178 of file makerow.cpp.

{
BLOBNBOX_IT blob_it = row->blob_list ();
inT32 *xstarts; // spline boundaries
double *coeffs; // quadratic coeffs
inT32 segments; // no of segments
xstarts =
(inT32 *) alloc_mem((row->blob_list()->length() + 1) * sizeof(inT32));
if (segment_baseline(row, block, segments, xstarts)
&& !textord_straight_baselines && !textord_parallel_baselines) {
coeffs = linear_spline_baseline(row, block, segments, xstarts);
} else {
xstarts[1] = xstarts[segments];
segments = 1;
coeffs = (double *) alloc_mem (3 * sizeof (double));
coeffs[0] = 0;
coeffs[1] = row->line_m ();
coeffs[2] = row->line_c ();
}
row->baseline = QSPLINE (segments, xstarts, coeffs);
free_mem(coeffs);
free_mem(xstarts);
}

void make_initial_textrows | ( | ICOORD | page_tr,
|  | TO_BLOCK * | block,
|  | FCOORD | rotation,
|  | BOOL8 | testing_on
| ) |  |

Definition at line 236 of file makerow.cpp.

{
TO_ROW_IT row_it = block->get_rows ();
#ifndef GRAPHICS_DISABLED
ScrollView::Color colour; //of row
if (textord_show_initial_rows && testing_on) {
if (to_win == NULL)
create_to_win(page_tr);
}
#endif
//guess skew
assign_blobs_to_rows (block, NULL, 0, TRUE, TRUE, textord_show_initial_rows && testing_on);
row_it.move_to_first ();
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ())
fit_lms_line (row_it.data ());
#ifndef GRAPHICS_DISABLED
if (textord_show_initial_rows && testing_on) {
colour = ScrollView::RED;
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
plot_to_row (row_it.data (), colour, rotation);
colour = (ScrollView::Color) (colour + 1);
if (colour > ScrollView::MAGENTA)
colour = ScrollView::RED;
}
}
#endif
}

float make_rows | ( | ICOORD | page_tr,
|  | TO_BLOCK_LIST * | port_blocks
| ) |  |

Definition at line 197 of file makerow.cpp.

{
float port_m; // global skew
float port_err; // global noise
TO_BLOCK_IT block_it; // iterator
block_it.set_to_list(port_blocks);
for (block_it.mark_cycle_pt(); !block_it.cycled_list();
block_it.forward())
make_initial_textrows(page_tr, block_it.data(), FCOORD(1.0f, 0.0f),
!(BOOL8) textord_test_landscape);
// compute globally
compute_page_skew(port_blocks, port_m, port_err);
block_it.set_to_list(port_blocks);
for (block_it.mark_cycle_pt(); !block_it.cycled_list(); block_it.forward()) {
cleanup_rows_making(page_tr, block_it.data(), port_m, FCOORD(1.0f, 0.0f),
block_it.data()->block->bounding_box().left(),
!(BOOL8)textord_test_landscape);
}
return port_m; // global skew
}

float make_single_row | ( | ICOORD | page_tr,
|  | TO_BLOCK * | block,
|  | TO_BLOCK_LIST * | blocks
| ) |  |

Definition at line 167 of file makerow.cpp.

{
BLOBNBOX_IT blob_it = &block->blobs;
TO_ROW_IT row_it = block->get_rows();
// Include all the small blobs and large blobs.
blob_it.add_list_after(&block->small_blobs);
blob_it.add_list_after(&block->noise_blobs);
blob_it.add_list_after(&block->large_blobs);
if (block->blobs.singleton()) {
blob_it.move_to_first();
float size = MakeRowFromSubBlobs(block, blob_it.data()->cblob(), &row_it);
if (size > block->line_size)
block->line_size = size;
}
MakeRowFromBlobs(block->line_size, &blob_it, &row_it);
// Fit an LMS line to the rows.
for (row_it.mark_cycle_pt(); !row_it.cycled_list(); row_it.forward())
fit_lms_line(row_it.data());
float gradient;
float fit_error;
// Compute the skew based on the fitted line.
compute_page_skew(blocks, gradient, fit_error);
return gradient;
}

float MakeRowFromSubBlobs | ( | TO_BLOCK * | block,
|  | C_BLOB * | blob,
|  | TO_ROW_IT * | row_it
| ) |  |

Definition at line 137 of file makerow.cpp.

{
// The blobs made from the children will go in the small_blobs list.
BLOBNBOX_IT bb_it(&block->small_blobs);
C_OUTLINE_IT ol_it(blob->out_list());
// Get the children.
ol_it.set_to_list(ol_it.data()->child());
if (ol_it.empty())
return 0.0f;
for (ol_it.mark_cycle_pt(); !ol_it.cycled_list(); ol_it.forward()) {
// Deep copy the child outline and use that to make a blob.
C_OUTLINE* outline = C_OUTLINE::deep_copy(ol_it.data());
// The constructor from a list of outlines corrects the direction.
C_OUTLINE_LIST outlines;
C_OUTLINE_IT ol_it(&outlines);
ol_it.add_after_then_move(outline);
C_BLOB* blob = new C_BLOB(&outlines);
BLOBNBOX* bbox = new BLOBNBOX(blob);
bb_it.add_after_then_move(bbox);
}
// Now we can make a row from the blobs.
return MakeRowFromBlobs(block->line_size, &bb_it, row_it);
}

void mark_repeated_chars | ( | TO_ROW * | row | ) |

Definition at line 2760 of file makerow.cpp.

{
BLOBNBOX_IT box_it(row->blob_list()); // Iterator.
int num_repeated_sets = 0;
if (!box_it.empty()) {
do {
BLOBNBOX* bblob = box_it.data();
int repeat_length = 0;
if (bblob->flow() == BTFT_LEADER &&
!bblob->joined_to_prev() && bblob->cblob() != NULL) {
BLOBNBOX_IT test_it(box_it);
for (test_it.forward(); !test_it.at_first(); test_it.forward()) {
bblob = test_it.data();
if (bblob->flow() != BTFT_LEADER)
break;
if (bblob->joined_to_prev() || bblob->cblob() == NULL) {
tprintf("Cancelled repeat of length %d due to %s\n",
repeat_length,
bblob->joined_to_prev() ? "Joined" : "Null");
repeat_length = 0;
break;
}
++repeat_length;
}
}
if (repeat_length >= kMinLeaderCount) {
num_repeated_sets++;
for (; repeat_length > 0; box_it.forward(), --repeat_length) {
bblob = box_it.data();
bblob->set_repeated_set(num_repeated_sets);
}
if (!box_it.at_first())
bblob->set_repeated_set(0);
} else {
box_it.forward();
bblob->set_repeated_set(0);
}
} while (!box_it.at_first()); // until all done
}
row->set_num_repeated_sets(num_repeated_sets);
}

OVERLAP_STATE most_overlapping_row | ( | TO_ROW_IT * | row_it,
|  | TO_ROW *& | best_row,
|  | float | top,
|  | float | bottom,
|  | float | rowsize,
|  | BOOL8 | testing_blob
| ) |  |

Definition at line 2598 of file makerow.cpp.

{
OVERLAP_STATE result; //result of tests
float overlap; //of blob & row
float bestover; //nearest row
float merge_top, merge_bottom; //size of merged row
ICOORD testpt; //testing only
TO_ROW *row; //current row
TO_ROW *test_row; //for multiple overlaps
BLOBNBOX_IT blob_it; //for merging rows
result = ASSIGN;
row = row_it->data ();
bestover = top - bottom;
if (top > row->max_y ())
bestover -= top - row->max_y ();
if (bottom < row->min_y ())
//compute overlap
bestover -= row->min_y () - bottom;
if (testing_blob) {
tprintf ("Test blob y=(%g,%g), row=(%f,%f), overlap=%f\n",
bottom, top, row->min_y (), row->max_y (), bestover);
}
test_row = row;
do {
if (!row_it->at_last ()) {
row_it->forward ();
test_row = row_it->data ();
if (test_row->min_y () <= top && test_row->max_y () >= bottom) {
merge_top =
test_row->max_y () >
row->max_y ()? test_row->max_y () : row->max_y ();
merge_bottom =
test_row->min_y () <
row->min_y ()? test_row->min_y () : row->min_y ();
if (merge_top - merge_bottom <= rowsize) {
if (testing_blob) {
tprintf ("Merging rows at (%g,%g), (%g,%g)\n",
row->min_y (), row->max_y (),
test_row->min_y (), test_row->max_y ());
}
test_row->set_limits (merge_bottom, merge_top);
blob_it.set_to_list (test_row->blob_list ());
blob_it.add_list_after (row->blob_list ());
blob_it.sort (blob_x_order);
row_it->backward ();
delete row_it->extract ();
row_it->forward ();
bestover = -1.0f; //force replacement
}
overlap = top - bottom;
if (top > test_row->max_y ())
overlap -= top - test_row->max_y ();
if (bottom < test_row->min_y ())
overlap -= test_row->min_y () - bottom;
if (bestover >= rowsize - 1 && overlap >= rowsize - 1) {
result = REJECT;
}
if (overlap > bestover) {
bestover = overlap; //find biggest overlap
row = test_row;
}
if (testing_blob) {
tprintf
("Test blob y=(%g,%g), row=(%f,%f), overlap=%f->%f\n",
bottom, top, test_row->min_y (), test_row->max_y (),
overlap, bestover);
}
}
}
}
while (!row_it->at_last ()
&& test_row->min_y () <= top && test_row->max_y () >= bottom);
while (row_it->data () != row)
row_it->backward (); //make it point to row
//doesn't overlap much
if (top - bottom - bestover > rowsize * textord_overlap_x &&
(!textord_fix_makerow_bug || bestover < rowsize * textord_overlap_x)
&& result == ASSIGN)
result = NEW_ROW; //doesn't overlap enough
best_row = row;
return result;
}

void pre_associate_blobs | ( | ICOORD | page_tr,
|  | TO_BLOCK * | block,
|  | FCOORD | rotation,
|  | BOOL8 | testing_on
| ) |  |

Definition at line 1965 of file makerow.cpp.

{
#ifndef GRAPHICS_DISABLED
ScrollView::Color colour; //of boxes
#endif
BLOBNBOX *blob; //current blob
BLOBNBOX *nextblob; //next in list
TBOX blob_box;
FCOORD blob_rotation; //inverse of rotation
BLOBNBOX_IT blob_it; //iterator
BLOBNBOX_IT start_it; //iterator
TO_ROW_IT row_it = block->get_rows ();
#ifndef GRAPHICS_DISABLED
colour = ScrollView::RED;
#endif
blob_rotation = FCOORD (rotation.x (), -rotation.y ());
for (row_it.mark_cycle_pt (); !row_it.cycled_list (); row_it.forward ()) {
//get blobs
blob_it.set_to_list (row_it.data ()->blob_list ());
for (blob_it.mark_cycle_pt (); !blob_it.cycled_list ();
blob_it.forward ()) {
blob = blob_it.data ();
blob_box = blob->bounding_box ();
start_it = blob_it; //save start point
// if (testing_on && textord_show_final_blobs)
// {
// tprintf("Blob at (%d,%d)->(%d,%d), addr=%x, count=%d\n",
// blob_box.left(),blob_box.bottom(),
// blob_box.right(),blob_box.top(),
// (void*)blob,blob_it.length());
// }
bool overlap;
do {
overlap = false;
if (!blob_it.at_last ()) {
nextblob = blob_it.data_relative(1);
overlap = blob_box.major_x_overlap(nextblob->bounding_box());
if (overlap) {
blob->merge(nextblob); // merge new blob
blob_box = blob->bounding_box(); // get bigger box
blob_it.forward();
}
}
}
while (overlap);
blob->chop (&start_it, &blob_it,
blob_rotation,
block->line_size * tesseract::CCStruct::kXHeightFraction *
textord_chop_width);
//attempt chop
}
#ifndef GRAPHICS_DISABLED
if (testing_on && textord_show_final_blobs) {
if (to_win == NULL)
create_to_win(page_tr);
to_win->Pen(colour);
for (blob_it.mark_cycle_pt (); !blob_it.cycled_list ();
blob_it.forward ()) {
blob = blob_it.data ();
blob_box = blob->bounding_box ();
blob_box.rotate (rotation);
if (!blob->joined_to_prev ()) {
to_win->Rectangle (blob_box.left (), blob_box.bottom (),
blob_box.right (), blob_box.top ());
}
}
colour = (ScrollView::Color) (colour + 1);
if (colour > ScrollView::MAGENTA)
colour = ScrollView::RED;
}
#endif
}
}

int row_spacing_order | ( | const void * | item1,
|  | const void * | item2
| ) |  |

Definition at line 2738 of file makerow.cpp.

{
//converted ptr
TO_ROW *row1 = *(TO_ROW **) item1;
//converted ptr
TO_ROW *row2 = *(TO_ROW **) item2;
if (row1->spacing < row2->spacing)
return -1;
else if (row1->spacing > row2->spacing)
return 1;
else
return 0;
}

int row_y_order | ( | const void * | item1,
|  | const void * | item2
| ) |  |

Definition at line 2716 of file makerow.cpp.

{
//converted ptr
TO_ROW *row1 = *(TO_ROW **) item1;
//converted ptr
TO_ROW *row2 = *(TO_ROW **) item2;
if (row1->parallel_c () > row2->parallel_c ())
return -1;
else if (row1->parallel_c () < row2->parallel_c ())
return 1;
else
return 0;
}

BOOL8 segment_baseline | ( | TO_ROW * | row,
|  | TO_BLOCK * | block,
|  | inT32 & | segments,
|  | inT32 | xstarts[]
| ) |  |

Definition at line 2212 of file makerow.cpp.

{
BOOL8 needs_curve; //needs curved line
int blobcount; //no of blobs
int blobindex; //current blob
int last_state; //above, on , below
int state; //of current blob
float yshift; //from baseline
TBOX box; //blob box
TBOX new_box; //new_it box
float middle; //xcentre of blob
//blobs
BLOBNBOX_IT blob_it = row->blob_list ();
BLOBNBOX_IT new_it = blob_it; //front end
SORTED_FLOATS yshifts; //shifts from baseline
needs_curve = FALSE;
box = box_next_pre_chopped (&blob_it);
xstarts[0] = box.left ();
segments = 1;
blobcount = row->blob_list ()->length ();
if (textord_oldbl_debug)
tprintf ("Segmenting baseline of %d blobs at (%d,%d)\n",
blobcount, box.left (), box.bottom ());
if (blobcount <= textord_spline_medianwin
|| blobcount < textord_spline_minblobs) {
blob_it.move_to_last ();
box = blob_it.data ()->bounding_box ();
xstarts[1] = box.right ();
return FALSE;
}
last_state = 0;
new_it.mark_cycle_pt ();
for (blobindex = 0; blobindex < textord_spline_medianwin; blobindex++) {
new_box = box_next_pre_chopped (&new_it);
middle = (new_box.left () + new_box.right ()) / 2.0;
yshift = new_box.bottom () - row->line_m () * middle - row->line_c ();
//record shift
yshifts.add (yshift, blobindex);
if (new_it.cycled_list ()) {
xstarts[1] = new_box.right ();
return FALSE;
}
}
for (blobcount = 0; blobcount < textord_spline_medianwin / 2; blobcount++)
box = box_next_pre_chopped (&blob_it);
do {
new_box = box_next_pre_chopped (&new_it);
//get middle one
yshift = yshifts[textord_spline_medianwin / 2];
if (yshift > textord_spline_shift_fraction * block->line_size)
state = 1;
else if (-yshift > textord_spline_shift_fraction * block->line_size)
state = -1;
else
state = 0;
if (state != 0)
needs_curve = TRUE;
// tprintf("State=%d, prev=%d, shift=%g\n",
// state,last_state,yshift);
if (state != last_state && blobcount > textord_spline_minblobs) {
xstarts[segments++] = box.left ();
blobcount = 0;
}
last_state = state;
yshifts.remove (blobindex - textord_spline_medianwin);
box = box_next_pre_chopped (&blob_it);
middle = (new_box.left () + new_box.right ()) / 2.0;
yshift = new_box.bottom () - row->line_m () * middle - row->line_c ();
yshifts.add (yshift, blobindex);
blobindex++;
blobcount++;
}
while (!new_it.cycled_list ());
if (blobcount > textord_spline_minblobs || segments == 1) {
xstarts[segments] = new_box.right ();
}
else {
xstarts[--segments] = new_box.right ();
}
if (textord_oldbl_debug)
tprintf ("Made %d segments on row at (%d,%d)\n",
segments, box.right (), box.bottom ());
return needs_curve;
}

void separate_underlines | ( | TO_BLOCK * | block,
|  | float | gradient,
|  | FCOORD | rotation,
|  | BOOL8 | testing_on
| ) |  |

Definition at line 1892 of file makerow.cpp.

{ // correct orientation
BLOBNBOX *blob; // current blob
C_BLOB *rotated_blob; // rotated blob
TO_ROW *row; // current row
float length; // of g_vec
TBOX blob_box;
FCOORD blob_rotation; // inverse of rotation
FCOORD g_vec; // skew rotation
BLOBNBOX_IT blob_it; // iterator
// iterator
BLOBNBOX_IT under_it = &block->underlines;
BLOBNBOX_IT large_it = &block->large_blobs;
TO_ROW_IT row_it = block->get_rows();
int min_blob_height = static_cast<int>(textord_min_blob_height_fraction *
block->line_size + 0.5);
// length of vector
length = sqrt(1 + gradient * gradient);
g_vec = FCOORD(1 / length, -gradient / length);
blob_rotation = FCOORD(rotation.x(), -rotation.y());
blob_rotation.rotate(g_vec); // undoing everything
for (row_it.mark_cycle_pt(); !row_it.cycled_list(); row_it.forward()) {
row = row_it.data();
// get blobs
blob_it.set_to_list(row->blob_list());
for (blob_it.mark_cycle_pt(); !blob_it.cycled_list();
blob_it.forward()) {
blob = blob_it.data();
blob_box = blob->bounding_box();
if (blob_box.width() > block->line_size * textord_underline_width) {
ASSERT_HOST(blob->cblob() != NULL);
rotated_blob = crotate_cblob (blob->cblob(),
blob_rotation);
if (test_underline(
testing_on && textord_show_final_rows,
rotated_blob, static_cast<inT16>(row->intercept()),
static_cast<inT16>(
block->line_size *
(tesseract::CCStruct::kXHeightFraction +
tesseract::CCStruct::kAscenderFraction / 2.0f)))) {
under_it.add_after_then_move(blob_it.extract());
if (testing_on && textord_show_final_rows) {
tprintf("Underlined blob at:");
rotated_blob->bounding_box().print();
tprintf("Was:");
blob_box.print();
}
} else if (CountOverlaps(blob->bounding_box(), min_blob_height,
row->blob_list()) >
textord_max_blob_overlaps) {
large_it.add_after_then_move(blob_it.extract());
if (testing_on && textord_show_final_rows) {
tprintf("Large blob overlaps %d blobs at:",
CountOverlaps(blob_box, min_blob_height,
row->blob_list()));
blob_box.print();
}
}
delete rotated_blob;
}
}
}
}

## Variable Documentation

const int kMinLeaderCount = 5

Definition at line 107 of file makerow.cpp.

const int kMinSize = 8

Definition at line 393 of file makerow.cpp.

const double kNoiseSize = 0.5

Definition at line 392 of file makerow.cpp.

double textord_ascheight_mode_fraction = 0.08

"Min pile height to make ascheight"

Definition at line 94 of file makerow.cpp.

double textord_ascx_ratio_max = 1.8

"Max cap/xheight"

Definition at line 98 of file makerow.cpp.

double textord_ascx_ratio_min = 1.25

"Min cap/xheight"

Definition at line 97 of file makerow.cpp.

bool textord_biased_skewcalc = TRUE

"Bias skew estimates with line length"

Definition at line 59 of file makerow.cpp.

double textord_chop_width = 1.5

"Max width before chopping"

Definition at line 79 of file makerow.cpp.

bool textord_debug_xheights = FALSE

"Test xheight algorithms"

Definition at line 58 of file makerow.cpp.

double textord_descheight_mode_fraction = 0.08

"Min pile height to make descheight"

Definition at line 96 of file makerow.cpp.

double textord_descx_ratio_max = 0.6

"Max desc/xheight"

Definition at line 100 of file makerow.cpp.

double textord_descx_ratio_min = 0.25

"Min desc/xheight"

Definition at line 99 of file makerow.cpp.

double textord_excess_blobsize = 1.3

"New row made if blob makes row this big"

Definition at line 86 of file makerow.cpp.

double textord_expansion_factor = 1.0

"Factor to expand rows by in expand_rows"

Definition at line 81 of file makerow.cpp.

bool textord_fix_makerow_bug = TRUE

"Prevent multiple baselines"

Definition at line 57 of file makerow.cpp.

bool textord_fix_xheight_bug = TRUE

"Use spline baseline"

Definition at line 56 of file makerow.cpp.

bool textord_heavy_nr = FALSE

"Vigorously remove noise"

Definition at line 45 of file makerow.cpp.

bool textord_interpolating_skew = TRUE

"Interpolate across gaps"

Definition at line 60 of file makerow.cpp.

double textord_linespace_iqrlimit = 0.2

"Max iqr/median for linespace"

Definition at line 77 of file makerow.cpp.

int textord_lms_line_trials = 12

"Number of linew fits to do"

Definition at line 102 of file makerow.cpp.

int textord_max_blob_overlaps = 4

"Max number of blobs a big blob can overlap"

Definition at line 69 of file makerow.cpp.

double textord_min_blob_height_fraction = 0.75

"Min blob height/top to include blob top into xheight stats"

Definition at line 90 of file makerow.cpp.

int textord_min_blobs_in_row = 4

"Min blobs before gradient counted"

Definition at line 65 of file makerow.cpp.

double textord_min_linesize = 1.25

"* blob height for initial linesize"

Definition at line 84 of file makerow.cpp.

int textord_min_xheight = 10

"Min credible pixel xheight"

Definition at line 70 of file makerow.cpp.

double textord_minxh = 0.25

"fraction of linesize for min xheight"

Definition at line 83 of file makerow.cpp.

bool textord_new_initial_xheight = TRUE

"Use test xheight mechanism"

Definition at line 103 of file makerow.cpp.

double textord_occupancy_threshold = 0.4

"Fraction of neighbourhood"

Definition at line 87 of file makerow.cpp.

bool textord_old_baselines = TRUE

"Use old baseline algorithm"

Definition at line 54 of file makerow.cpp.

bool textord_old_xheight = FALSE

"Use old xheight algorithm"

Definition at line 55 of file makerow.cpp.

double textord_overlap_x = 0.5

"Fraction of linespace for good overlap"

Definition at line 82 of file makerow.cpp.

bool textord_parallel_baselines = TRUE

"Force parallel baselines"

Definition at line 52 of file makerow.cpp.

bool textord_show_expanded_rows = FALSE

"Display rows after expanding"

Definition at line 48 of file makerow.cpp.

bool textord_show_final_blobs = FALSE

"Display blob bounds after pre-ass"

Definition at line 50 of file makerow.cpp.

bool textord_show_final_rows = FALSE

"Display rows after final fitting"

Definition at line 49 of file makerow.cpp.

bool textord_show_initial_rows = FALSE

"Display row accumulation"

Definition at line 46 of file makerow.cpp.

bool textord_show_parallel_rows = FALSE

"Display page correlated rows"

Definition at line 47 of file makerow.cpp.

double textord_skew_ile = 0.5

"Ile of gradients for page skew"

Definition at line 75 of file makerow.cpp.

double textord_skew_lag = 0.01

"Lag for skew on row accumulation"

Definition at line 76 of file makerow.cpp.

int textord_skewsmooth_offset = 2

"For smooth factor"

Definition at line 61 of file makerow.cpp.

int textord_skewsmooth_offset2 = 1

"For smooth factor"

Definition at line 62 of file makerow.cpp.

int textord_spline_medianwin = 6

"Size of window for spline segmentation"

Definition at line 67 of file makerow.cpp.

int textord_spline_minblobs = 8

"Min blobs in each spline segment"

Definition at line 66 of file makerow.cpp.

double textord_spline_outlier_fraction = 0.1

"Fraction of line spacing for outlier"

Definition at line 74 of file makerow.cpp.

double textord_spline_shift_fraction = 0.02

"Fraction of line spacing for quad"

Definition at line 72 of file makerow.cpp.

bool textord_straight_baselines = FALSE

"Force straight baselines"

Definition at line 53 of file makerow.cpp.

bool textord_test_landscape = FALSE

"Tests refer to land/port"

Definition at line 51 of file makerow.cpp.

int textord_test_x = -1

"coord of test pt"

Definition at line 63 of file makerow.cpp.

int textord_test_y = -1

"coord of test pt"

Definition at line 64 of file makerow.cpp.

double textord_underline_width = 2.0

"Multiple of line_size for underline"

Definition at line 88 of file makerow.cpp.

double textord_width_limit = 8

"Max width of blobs to make rows"

Definition at line 78 of file makerow.cpp.

double textord_xheight_error_margin = 0.1

"Accepted variation"

Definition at line 101 of file makerow.cpp.

double textord_xheight_mode_fraction = 0.4

"Min pile height to make xheight"

Definition at line 92 of file makerow.cpp.