OpenCV——ROI截取、线性混合、通道分离、合并、亮度对比度调整

 #include <opencv2/opencv.hpp>
 #include <iostream>

 using namespace cv;
 using namespace std;

 int main(int argc, char** argv)
 {
     Mat src = imread("test.jpg");
     Mat logo = imread("logo.jpg");

     //设定ROI区域
     Mat ROI = src(Rect(, , logo.cols, logo.rows));//注意这边Rect函数，先列后行（长*高（宽））
     imshow("原始ROI", ROI);

     //用logo的图像矩阵替换掉ROI区域的数据
     logo.copyTo(ROI);

     imshow("后来ROI", ROI);
     imshow("src", src);

     waitKey();
     return ;

 }

 #include <opencv2/opencv.hpp>
 #include <iostream>

 using namespace cv;
 using namespace std;

 int main(int argc, char** argv)
 {
     Mat src = imread("test.jpg");
     Mat logo = imread("logo.jpg");

     //设定ROI区域
     Mat ROI = src(Rect(, , logo.cols, logo.rows));//注意这边Rect函数，先列后行（长*高（宽））
     imshow("ROI", ROI);    

     addWeighted(ROI,, logo, 0.1, ., ROI,-);//两张图片必须大小相同
     imshow("src", src);

     waitKey();
     return ;

 }

 #include <opencv2/opencv.hpp>
 #include <iostream>

 using namespace cv;
 using namespace std;

 int main(int argc, char** argv)
 {
     Mat src = imread("test.jpg");
     Mat ROI;
     vector<Mat> channls;
     split(src, channls);
     ROI = channls.at();

     imshow("ROI", ROI);
     imshow("src", src);

     waitKey();
     return ;

 }

 #include <opencv2/opencv.hpp>
 #include <iostream>

 using namespace cv;
 using namespace std;

 int main(int argc, char** argv)
 {
     Mat src = imread("test.jpg");
     Mat Red,Green,Blue,dst;
     vector<Mat> channls;
     split(src, channls);
     Blue = channls.at();
     Green = channls.at();
     Red = channls.at();

     imshow("Blue", Blue);
     imshow("Green", Green);
     imshow("Red", Red);
     imshow("src", src);

     merge(channls, dst);
     imshow("dst", dst);

     waitKey();
     return ;

 }