It looks like that Sobel convolution kernels are wrong. From ImageJ forum discussion : http://forum.imagej.net/t/questions-about-the-5x5-sobel-filter-in-directionality-plugin/10230/2
It looks like that Sobel convolution kernels are wrong.
From ImageJ forum discussion : http://forum.imagej.net/t/questions-about-the-5x5-sobel-filter-in-directionality-plugin/10230/2