区域填充是指先将区域内的一个像素 ，一般称为种子点赋予给定的颜色和辉亮，然后将该颜色扩展到整个区域内的过程。(Area filling refers to the process that a pixel in a region is generally called a seed point to give a given color and highlight, and then the color is extended to the entire region.)