Laplacian Filter

The Laplacian Filter calculates the local second derivative of image values at each point in the image. This filter is used to calculate the strength of edges and discontinuities for features in the image. Different filter types calculate the Laplacian value using a different local neighborhood description. To calculate the directional gradient, or directional first derivative, see the Compass Gradient Filter.

The Laplacian Filter command opens from the Image Window > Process > Filters menu and button on the Main Toolbar. The "immediate" form, shown first, opens when an image or image set is displayed in the top-most window. The general form can be used to select source images from folders, windows, or by matching templates.

Laplacian Filter

Profile [\|>]	Selects the parameter profile for this command and allows you to save or work with existing presets.
[Select]	Opens the Select Source Images dialog to choose images from an image window, folder, files, name template, or a Mira File List.
Filter Type	Provides options for specifying the local neighborhood in different ways.
Source Region	Specifies the rectangular region to be processed. The options are as follows: Entire image: The entire image is processed. Image Cursor: The region to be processed is selected using the Image Cursor. Rectangle: The region specified by Min andMax limits for Column and Row coordinates is processed. Column and Row, Min and Max: When Rectangle is selected, these values specify the column and row limits to be processed.

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