Introduction - If you have any usage issues, please Google them yourself
canny edge detection total of four parts:
1. Gaussian smoothing the original image
2. After the images were Gaussian smoothing sobel edge detection. Here and there on request transverse vertical joint, so a total of three needs sobel edge detection image.
3. sobel combined detection image greatly suppress non-
4. Connect the edge point and hysteresis thresholding.