opencv中copyTo的用法

参考链接：

https://www.cnblogs.com/phoenixdsg/p/8420716.html

https://blog.youkuaiyun.com/qch494562564/article/details/50589253

https://blog.youkuaiyun.com/u013270326/article/details/72730812

A.copyTo（B，C）

理解：将C与A取交集,只保留相交（相同）的地方，其余C中没有被交掉的地方都转化为黑色，然后作为最后B的体现

#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include<iostream>
using namespace cv;

bool ROI_AddImage()
{
    Mat srcImage1 = imread("1.jpg");  
    Mat logoImage = imread("5.png");

    if (!srcImage1.data && !logoImage.data)
    {
        std::cout << "read filed" << std::endl;
        return false;
    }

    Mat imageROI = srcImage1(Rect(0, 0, logoImage.cols, logoImage.rows));
    imshow("imageROI",imageROI);
    Mat mask = imread("2.png",0);

    logoImage.copyTo(imageROI, mask);
    //正解：将mask与logoImage取交集,只保留相交（相同）的地方，其余mask中没有被交掉的地方都转化为黑色，然后作为最后imageROI的体现
    //mask和logoImage必须大小相同?
    //logoImage.copyTo(imageROI);  //没有mask的作用
    imshow("imageROI11",imageROI);
    imshow("logoImage",logoImage);
    namedWindow("srcImage1");
    imshow("srcImage1", srcImage1);

}
void main()
{
    ROI_AddImage();
    waitKey();
}

结果图：