【opencv4】opencv视频教程 C++（opencv教程）3、矩阵的掩膜操作（filter2D）

#include 
#include 

using namespace cv;

int main(int argc, const char* argv[]) {

	Mat src, dst;
	src = imread("./test.jpg");
	//if (src.empty()) {
	if (!src.data){
		printf("could not load image...n");
		return -1;
	}
	namedWindow("input img");	//默认自动窗口大小
	imshow("input img", src);

	

	//投机取巧调包侠上线！也看不太懂
	Mat kernel = (Mat_(3, 3) << 0, -1, 0, -1, 5, -1, 0, -1, 0);	//默认
	//Mat kernel = (Mat_(3, 3) << -1, -1, -1, -1, 5, -1, -1, -1, -1);	//没效果，一片黑
	//Mat kernel = (Mat_(3, 3) << 0, -1, 0, -1, 10, -1, 0, -1, 0);	//感觉有种曝光过度感觉
	//Mat kernel = (Mat_(3, 3) << 0, -2, 0, -2, 16, -2, 0, -2, 0);	//明显曝光过度
	//Mat kernel = (Mat_(3, 3) << 0, -2, 0, -2, 8, -2, 0, -2, 0);	//直接变白素描了
	//Mat kernel = (Mat_(3, 3) << 0, -2, 0, -2, 9, -2, 0, -2, 0);	//貌似跟（0, -1, 0, -1, 5, -1, 0, -1, 0）相同
	//Mat kernel = (Mat_(3, 3) << 0, -10, 0, -10, 41, -10, 0, -10, 0);	//这。。。
	filter2D(src, dst, src.depth(), kernel);

	namedWindow("output img");	//默认自动窗口大小
	imshow("output img", dst);

	waitKey(0);
	return 0;
}

vs编译运行结果：

opencv filter2D()函数（卷积）计算原理