A gradient of 2 and a gradient of -2 have the same steepness, one going up and the other going down, from left to right. Image caption, Parallel lines have the same gradient. Both lines have a ...
(Wikipedia) The Canny edge detection algorithm is composed of 5 steps: We've covered steps 1 and 2 in the Image Convolution section. Gradients using Sobel Kernels did a pretty good job of detecting ...
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