c++ - 使用 Visual Studio 2015 的网络摄像头

Question

我有 VS-15 和 OpenCV-3.1。在输出窗口上，我得到一个纯灰色的空白显示。我该如何解决？

#include <opencv2\highgui\highgui.hpp>

int main() {
cvNamedWindow("Webcam Stream", CV_WINDOW_AUTOSIZE);
CvCapture* capture = cvCreateCameraCapture(0);
IplImage* frame;
while (1) {
    frame = cvQueryFrame(capture);
    if (!frame) break;
    cvShowImage("Streaming", frame);
    char c = cvWaitKey(33);
    if (c == 27) break;
}
cvReleaseCapture(&capture);
cvDestroyWindow("Example");
return 0;
}

Answer 1

不知道为什么它不起作用。但我设法从这里找到了另一个代码。此新代码不显示镜像，因此视图被横向翻转。但它有效。

要编辑它以使图像不翻转，请将 while 循环替换为：

    while (1)
{
    Mat frame;
    Mat flipped; //***added new line

    bool bSuccess = cam.read(frame); // read a new frame from video

    if (!bSuccess) //if not success, break loop
    {
        cout << "Cannot read a frame from video stream" << endl;
        break;
    }

    cv::flip(frame, flipped, 1); //***added new line

    imshow("MyVideo", flipped); //***editted line

    if (waitKey(30) == 27) //wait for 'esc' key press for 30ms. If 'esc' key is pressed, break loop
    {
        cout << "esc key is pressed by user" << endl;
        break;
    }
}