"Digital Image Processing" third edition Rafael C. Gonzalez waiting
P50
Take a point, (x,y), calculate the average value of the neighborhood, and assign it to all the neighborhoods. It can be blurred. Found that the larger the neighborhood, the more blurred
https://github.com/penkee/imagecal/blob/master/app-dao/src/main/java/com/dcloud/process/OperateImage.java