Sobel and Prewitt gradient edge detector jit.sobel provides two different kinds of edge detection algorithms. Cycling '74 Jitter Jitter Blur/Sharpen in TEXT_HERE TEXT_HERE out TEXT_HERE dumpout TEXT_HERE char long float32 float64 Detection mode The detection mode. (default = 0 (Sobel))
0 = Sobel
1 = Prewitt Threshold The threshold below which matrix values are set to 0. (default = 0.) Both implemented edge detection modes use 3x3 convolution kernels to compute a 2-dimensional spatial gradient of an incoming matrix, brightening features with "high spatial frequency" -- a large amount of change from cell to cell -- and darkening features with less change. The Sobel detector is fairly good at detecting edges in all directions, while the Prewitt is more biased toward edges running vertically and horizontally along the matrix frame.