c++ - OpenCV 中的叠加图像

Question

我正在尝试使用 OpenCV 在我的程序的视频捕获上覆盖图像，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区域。然后我将它复制到原始框架。但是，它从未出现在网络摄像头捕获的新帧中。我测试了它并且图像加载正确但由于某种原因它没有被复制到新框架。

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;
}

如有任何建议或帮助，我们将不胜感激。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;
}