最简单的平滑滤波是将原图中一个像素的灰度值和它周围邻近8个像素的灰度值相加，然后将求得的平均值（除以9）作为新图中该像素的灰度值。它采用模板计算的思想，模板操作实现了一种邻域运算，即某个像素点的结果不仅与本像素灰度有关，而且与其邻域点的像素值有关。-Smoothing filter is the most simple gray gray of a pixel in the original image and its neighboring 8 pixel value, average val

opencv 找到物体的重心，主要是参照了通过计算多边形的平均值-opencv find the center of gravity is mainly calculated by reference to the average of the polygon