Calculate difference between two images and threshold it.

Namespace:  AForge.Imaging.Filters
Assembly:  AForge.Imaging (in AForge.Imaging.dll) Version: (


public class ThresholdedDifference : BaseFilter2


The filter produces similar result as applying Difference filter and then Threshold filter - thresholded difference between two images. Result of this image processing routine may be useful in motion detection applications or finding areas of significant difference.

The filter accepts 8 and 24/32color images for processing. In the case of color images, the image processing routine differences sum over 3 RGB channels (Manhattan distance), i.e. |diffR| + |diffG| + |diffB|.

Sample usage:

// create filter
ThresholdedDifference filter = new ThresholdedDifference( 60 );
// apply the filter
filter.OverlayImage = backgroundImage;
Bitmap resultImage = filter.Apply( sourceImage );

Source image:

Background image:

Result image:

Inheritance Hierarchy


See Also