1、载入图片 2、获得鼠标位置 3、获得鼠标在图片位置处的灰度值 4、获得鼠标在图片位置21*21范围为中心的灰度直方图 非本人编写-1, 2 load image, get the mouse position 3, mouse gray value images obtained at the position 4, to get the mouse position in the picture 21* 21 as the center of the range of non-