OpenCV中的叠加图像

Question

我正在尝试使用 OpenCV 将图像覆盖在我的程序的视频捕获上，但我无法让它工作。我以矩形的形式在从网络摄像头拍摄的原始帧中设置了一个感兴趣的区域。然后我将它复制到原始框架。但是，它永远不会出现在网络摄像头捕获的新帧上。我对其进行了测试，图像加载正确，但由于某种原因它没有被复制到新框架中。

C++ 代码如下：

#include<opencv2/core/core.hpp>
#include<opencv2/contrib/contrib.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<iostream>
#include<vector>

using namespace std;
using namespace cv;

int main(){
    VideoCapture cap;
    cap.open(0);

    if(!cap.isOpened()){
        cerr << "Error opening the webcam!" << endl;
        return -1;
    }


    for(;;){
        Mat frame;

        cap>>frame; 

        Mat newFrame;
        frame.copyTo(newFrame);

        Mat image = imread("C:\\User\\Desktop\\images\\image.png");


    int cx = (newFrame.cols - 70) / 2;
        if (image.data) {
            // Get a BGR version of the face, since the output is BGR color
            Mat srcBGR = Mat(face.size(), CV_8UC3);
            cvtColor(image, srcBGR, CV_GRAY2BGR);
            // Get the destination ROI (and make sure it is within the image)
            Rect dstRC = Rect(cx, newFrame.rows/2, 70, 70);
            Mat dstROI = newFrame(dstRC);
            // Copy the pixels from src to dst.
            srcBGR.copyTo(dstROI);
        }


        imshow("frame", newFrame);
        char key = (char) waitKey(30);
        // Exit this loop on escape:
        if(key == 27)
            break;
    }   

    return 0;
}

任何建议或帮助将不胜感激。谢谢。

Answer 1

您使用未转换的图像将图像转换为 BGR： 改变这个： image.copyTo(dstROI);到这个 srcBGR.copyTo(dstROI);

#include<opencv2/core/core.hpp>
#include<opencv2/contrib/contrib.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<iostream>
#include<vector>

using namespace std;
using namespace cv;

int main(){
    VideoCapture cap;
    cap.open(0);

    if(!cap.isOpened()){
        cerr << "Error opening the webcam!" << endl;
        return -1;
    }
    Mat image = imread("D:\\ImagesForTest\\Lena.jpg",0);
    cv::resize(image,image,Size(70,70));  
    Mat frame;
    for(;;){
        cap>>frame; 
        Mat newFrame=frame.clone();
        int cx = (newFrame.cols - 70) / 2;
        if (!image.empty()) {
            // Get a BGR version of the face, since the output is BGR color
            Mat srcBGR = Mat(image.size(), CV_8UC3);
            cvtColor(image, srcBGR, CV_GRAY2BGR);
            // Get the destination ROI (and make sure it is within the image)
            Rect dstRC = Rect(cx, newFrame.rows/2, 70, 70);
            Mat dstROI = newFrame(dstRC);
            // Copy the pixels from src to dst.
            srcBGR.copyTo(dstROI);
        }
        imshow("frame", newFrame);
        char key = (char) waitKey(30);
        // Exit this loop on escape:
        if(key == 27)
            break;
    }   

    return 0;
}