从相机OpenCV获取输入C ++

Question

使用opencv显示图像时，总是出现灰色屏幕，该图像是从相机捕获的。 有什么帮助吗？

#include "stdafx.h"
#include <opencv2\opencv.hpp>
#include <opencv2\imgcodecs.hpp>

using namespace cv;

cv::Mat takePicture() {
cv::Mat pic;
VideoCapture cam(0);
while (!cam.isOpened()) {
    std::cout << "Failed to make connection to cam" << std::endl;
    VideoCapture cam(0);
}
cam >> pic;
return pic;
}
int main()
{

cv::Mat pic1;

pic1 = takePicture();

imshow("camera", pic1);

}

Answer 1

相机需要时间初始化。 也许您应该像这样更改代码：

#include "stdafx.h"
#include <opencv2\opencv.hpp>
#include <opencv2\imgcodecs.hpp>    
VideoCapture cam(0);
cv::Mat pic;
cv::Mat takePicture(){
    while (!cam.isOpened()) {
        std::cout << "Failed to make connection to cam" << std::endl;
        cam.open(0);
    }
    cam>>pic;
    return pic;
}
int main(){
    cv::waitKey(1000);
    cv::Mat pic1;
    pic1 = takePicture();
    imshow("camera", pic1);
    cv::waitKey();
}