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Menu:   Processing > Filters… > Edges->Variance  
Script:   variance  
Use this function to detect edges and textures in an image. The filter works by adding the squares of the differences between the intensity of the central pixel and its neighbors. If an overflow occurs, the result is clipped to the minimum or maximum pixel value for the given image type.

If you choose this command, the following options will become available:

Displays the input image frame number. If you want to process another image, type or select the corresponding value.  

Displays the number of the frame in which the output image will be created. Depending on the Preferences. ImageWarp will set it either to the first available value or to the Input frame number. Type or select another value if you want the output image to be created in a different frame.  

Select this check box to watch the Preview of the output image.  
Lets you choose the size of the square neighborhood in which the variance is calculated. This value must not exceed 2*Overscan+1. See Preferences for more details.  
Select this check box to invert the resulting image. The edges will be presented as dark lines on a bright background.