如何在opencv C++中使用相应的掩码复制图像？

如何解决如何在opencv C++中使用相应的掩码复制图像？

代码：

#include <iostream>
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>

using namespace std;
using namespace cv;

int main()
{

 //   Mat faceImage = imread("/Users/softech66/Downloads/images 2/unvese_space.png");
 //   Mat glassBGR = imread("/Users/softech66/Downloads/images 2/sun.png");
  //  /Users/softech66/Downloads/images 2/sun_mask.bmp
  //  resize(glassBGR,glassBGR,Size(300,100));
    // check each pixel of glass and if its white(255,255,255) then change it with face image pixels
    Mat img2 = imread("/Users/softech66/Downloads/images 2/sun.png",0);
    Mat img4 = imread("/Users/softech66/Downloads/images 2/univese_space.png",0);
    Mat img3 = imread("/Users/softech66/Downloads/images 2/sun_mask.bmp",0);

    
    Mat img;
    cvtColor(imread("/Users/softech66/Downloads/images 2/sun.png",IMREAD_COLOR),img,cv::COLOR_RGB2RGBA);
    Mat mask = imread("/Users/softech66/Downloads/images 2/sun_mask.bmp",IMREAD_GRAYSCALE);
    for(int r = 0; r < img.rows; r++){
        for(int c = 0; c < img.cols; c++){
            uchar alpha = 0;
            if(r < mask.rows && c < mask.cols)
                alpha = mask.at<uchar>(r,c);
            img.at<Vec4b>(r,c)[3] = alpha;
        }
    }
    imwrite("result.png",img);
    
    Mat roi=img4(Rect(0,img.cols,img2.rows));
    Mat mask1(roi.rows,roi.cols,roi.depth(),Scalar(1));

       img.copyTo(roi,mask1);

  //  img4.copyTo(img);
    imshow("img3",img4);
  //  imshow("img33",img4);

    waitKey(0);
}

上面的图片是成对出现的，因为你需要使用对应的“mask”图片让OpenCV只将圆形区域复制到宇宙空间图片中。注意遮罩图像，扩展名为“.bmp”。这是因为 bmp 格式为位存储提供了更高的精度。但是OpenCV通过使用“imread(...,0)”以同样的方式加载它们并没有区别，第二个参数“0”表示要加载的单通道或灰度图像。

Moon Mask Earth Mask Sun Mask

Universe Space

Moon image Earth image Sun image

Result image