OpenCV——ROI截取、线性混合、通道分离、合并、亮度对比度调整

 1 #include <opencv2/opencv.hpp>
 2 #include <iostream>
 3 
 4 using namespace cv;
 5 using namespace std;
 6 
 7 int main(int argc, char** argv)
 8 {
 9     Mat src = imread("test.jpg");
10     Mat logo = imread("logo.jpg");
11     
12     //设定ROI区域
13     Mat ROI = src(Rect(20, 25, logo.cols, logo.rows));//注意这边Rect函数，先列后行（长*高（宽））
14     imshow("原始ROI", ROI);
15 
16     //用logo的图像矩阵替换掉ROI区域的数据
17     logo.copyTo(ROI);
18 
19     imshow("后来ROI", ROI);
20     imshow("src", src);
21 
22     waitKey(0);
23     return 0;
24 
25 }

 1 #include <opencv2/opencv.hpp>
 2 #include <iostream>
 3 
 4 using namespace cv;
 5 using namespace std;
 6 
 7 int main(int argc, char** argv)
 8 {
 9     Mat src = imread("test.jpg");
10     Mat logo = imread("logo.jpg");
11     
12     //设定ROI区域
13     Mat ROI = src(Rect(20, 25, logo.cols, logo.rows));//注意这边Rect函数，先列后行（长*高（宽））
14     imshow("ROI", ROI);    
15 
16     addWeighted(ROI,1, logo, 0.1, 0., ROI,-1);//两张图片必须大小相同
17     imshow("src", src);
18 
19     waitKey(0);
20     return 0;
21 
22 }

 1 #include <opencv2/opencv.hpp>
 2 #include <iostream>
 3 
 4 using namespace cv;
 5 using namespace std;
 6 
 7 int main(int argc, char** argv)
 8 {
 9     Mat src = imread("test.jpg");
10     Mat ROI;
11     vector<Mat> channls;
12     split(src, channls);
13     ROI = channls.at(0);
14     
15     imshow("ROI", ROI);    
16     imshow("src", src);
17 
18     waitKey(0);
19     return 0;
20 
21 }

 1 #include <opencv2/opencv.hpp>
 2 #include <iostream>
 3 
 4 using namespace cv;
 5 using namespace std;
 6 
 7 int main(int argc, char** argv)
 8 {
 9     Mat src = imread("test.jpg");
10     Mat Red,Green,Blue,dst;
11     vector<Mat> channls;
12     split(src, channls);
13     Blue = channls.at(0);
14     Green = channls.at(0);
15     Red = channls.at(0);
16     
17     imshow("Blue", Blue);
18     imshow("Green", Green);
19     imshow("Red", Red);
20     imshow("src", src);
21 
22     merge(channls, dst);
23     imshow("dst", dst);
24 
25     waitKey(0);
26     return 0;
27 
28 }

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原文地址：https://www.cnblogs.com/long5683/p/9655910.html