OpenCV官方文档研究（二）卷积

I(i,j) = 5 * I(i,j) − [I(i − 1,j) + I(i + 1,j) + I(i,j − 1) + I(i,j + 1)]
⇐⇒ I(i,j) * M,where M =
(0 -1 0)
(-1 5 -1)
(0 -1 0)

OpenCV用filter2D(I, K, I.depth(), kern)进行领域卷积运算


Mat A=imread (picName,CV_LOAD_IMAGE_COLOR);
Mat mask=(Mat_(3,3)<<0,-1,0,-1,5,-1,0,-1,0);
Mat B;
filter2D (A,B,A.depth (),mask);