Range Filter

Category:	Image Filters
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Description:	Filter to compute the maximum difference (maximum-minimum) image. The difference between the maximum and minimum values from the nine kernel (3 x 3) generated images result in excellent edge finding. Note this is a not a 'recognised' filter.
Acknowledgements:	For an excellent overview of image processing methods and applications see 'The Image Processing Handbook' by john Russ
Script version:	2.0
DM/GMS version:	3.6.5
Script written as a function:	No
Source:	Show code
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