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 Homogenity
The filter finds objects' edges by calculating maximum difference of processing pixel with neighboring pixels in 8 directions.
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 Difference
The filter finds objects' edges by calculating maximum difference between pixels in 4 directions around the processing pixel.
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 Sobel
The filter searches for objects' edges by applying Sobel operator.
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 Canny
The filter searches for objects' edges by applying Canny edge detector.
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