Introduction - If you have any usage issues, please Google them yourself
Smoothing filter is the most simple gray of a pixel in the original image and its neighboring 8 pixel value, average value and then the obtained (divided by 9) as the pixel gray value in the new. It uses the template computation theory, template operation to achieve a neighborhood operation, which results in a pixel is not only related to the pixel, and the pixel and its neighborhood points related to the value of.