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(20, 25, 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(0);
    return 0;

}

#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(20, 25, logo.cols, logo.rows));//注意这边Rect函数，先列后行（长*高（宽））
    imshow("ROI", ROI);    

    addWeighted(ROI,1, logo, 0.1, 0., ROI,-1);//两张图片必须大小相同
    imshow("src", src);

    waitKey(0);
    return 0;

}

#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(0);
    
    imshow("ROI", ROI);    
    imshow("src", src);

    waitKey(0);
    return 0;

}

#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(0);
    Green = channls.at(0);
    Red = channls.at(0);
    
    imshow("Blue", Blue);
    imshow("Green", Green);
    imshow("Red", Red);
    imshow("src", src);

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

    waitKey(0);
    return 0;

}