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| DiffusivityFunctor Class Template Reference |
--- | --- | ---

Diffusivity functor for non-linear diffusion. More...

`#include "vigra/nonlineardiffusion.hxx"`

## Public Types

typedef Value | first_argument_type
typedef Value | second_argument_type
typedef NumericTraits< Value >::RealPromote | result_type
typedef Value | value_type

## Public Methods

| DiffusivityFunctor (Value const &thresh)
result_type | operator() (first_argument_type const &gx, second_argument_type const &gy) const
result_type | operator() (RGBValue< Value > const &gx, RGBValue< Value > const &gy) const

## Detailed Description

### template<class Value>
class vigra::DiffusivityFunctor< Value >

Diffusivity functor for non-linear diffusion.

This functor implements the diffusivity recommended by Weickert:

where `thresh` is a threshold that determines whether a specific gradient magnitude is interpreted as a significant edge (above the threshold) or as noise. It is meant to be used with nonlinearDiffusion().

Examples:

  smooth.cxx.

## Member Typedef Documentation

typedef Value first_argument_type

| the functors first argument type (must be an algebraic field with `exp()` defined). However, the functor also works with RGBValue<first_argument_type> (this hack is necessary since Microsoft C++ doesn't support partial specialization).

typedef NumericTraits<Value>::RealPromote result_type

| the functors result type

typedef Value second_argument_type

| the functors second argument type (same as first). However, the functor also works with RGBValue<second_argument_type> (this hack is necessary since Microsoft C++ doesn't support partial specialization).

typedef Value value_type

Deprecated:
  use first_argument_type, second_argument_type, result_type

## Constructor & Destructor Documentation

DiffusivityFunctor | ( | Value const & | thresh | ) | `[inline]`

| init functor with given edge threshold

## Member Function Documentation

result_type operator() | ( | RGBValue< Value > const & | gx,
|  | RGBValue< Value > const & | gy
| ) | const`[inline]`

| calculate diffusivity from RGB arguments

result_type operator() | ( | first_argument_type const & | gx,
|  | second_argument_type const & | gy
| ) | const`[inline]`

| calculate diffusivity from scalar arguments

The documentation for this class was generated from the following file:

- vigra/nonlineardiffusion.hxx

© Ullrich Köthe (koethe@informatik.uni-hamburg.de) Cognitive Systems Group, University of Hamburg, Germany | html generated using doxygen and Python VIGRA 1.4.0 (21 Dec 2005)