## Engauge Digitizer - Automatic Point Graph Tutorial

### Automatically Digitizing A Point Graph Image

The following steps automatically digitize a linear cartesian graph with one curve.

- Import the pointplot.bmp case from the Samples directory, using File/Import as shown. Not shown are the other methods of importing: using the "-import" command line option, by copying and pasting, and by dragging and dropping

- Click on the Axes Point button before entering axes points. These will define the coordinate system

- Click on one of the axes to add the first axes point, then enter its graph coordinates

- Click on one of the axes to add the second axes point, then enter its graph coordinates

- Click on one of the axes to add the third axes point, then enter its graph coordinates

- View the processed image by selecting the View/Processed Image menu option.

- Tune the discretize settings using the Settings/Discretize menu option, so unwanted information in the image is removed. The dialog that appears is explained at Discretize Dialog.

- Remove the grid lines from the original image using the Settings/Grid Removal menu option, so unwanted information in the image is removed. The dialog that appears is explained at Grid Removal Dialog.

- Click on the Point Match button.

- Click on the point in the processed image that is the best example of the type of point you want. A green box will appear around the image point that best matches the sample point you picked, and a green point will appear inside. A red box will appear around the image point that is next in terms of matching the sample point, and a red point will appear inside.

- Accept the red point in the red box by pressing the right arrow or up arrow. That red point will turn green, which means that it is accepted, and the green box will move to that point. The red box will move to the next most promising match point. To reject an accepted point, press the left arrow or down arrow. Use the arrow keys to accept points (change red points to green points), or reject points (change green points to red points). Continue accepting points until a useful set of accepted points is created.

- Leave Point Match mode to assign all accepted points to the current curve. If no points are acceptable, reject all points before leaving Point Match mode.

- Export the curve points into a tabular text file using the File/Export As menu option as shown. Not shown are the other methods of exporting the curve points from the curve geometry window: copying and pasting, and dragging and dropping