Learning immediately: https://edu.csdn.net/course/play/26281/327073?utm_source=blogtoedu
Image Smoothing:
1. The average filtering (edge will be smooth, loss of image detail)
2. The weighted average filter (Gaussian filter: removing noise without loss of detail, the most commonly used, for best Gaussian noise)
3. bilateral filtering
4. The median filtering (salt and pepper noise, noise isolation)
These are the spatial filtering.
