windows - OpenCV VideoCapture 在 Visual Studio 2017 (Windows 10) 中不起作用

Question

我有一个很奇怪的问题。当我从 Visual Studio 运行 C++ 应用程序时，VideoCapture 既不打开网络摄像头也不打开视频文件，如果是网络摄像头，则会出现以下错误:

WinRT originate error - 0xC00D36B3 : 'The stream number provided was invalid.'

其次是

Microsoft C++ exception: _com_error at memory location 0x000000D9B66FCBB0. Microsoft C++ exception: _com_error at memory location 0x000000D9B66FCAA0. Microsoft C++ exception: cv::Exception at memory location 0x000000D9B66FEFD0. Microsoft C++ exception: cv::Exception at memory location 0x000000D9B66FEFD0.

但是当我从 VS 外部运行应用程序时，一切正常。我使用 OpenCV v4.0.0

Answer 1

要诊断您的问题，请先尝试以下操作并向我提供反馈。

#include <opencv2/opencv.hpp>

using namespace cv;

int main()
{
    VideoCapture cap(0); // open the default camera
    if (!cap.isOpened())  // check if we succeeded
        return -1;

    Mat edges;
    Mat frame;
    namedWindow("edges", WINDOW_NORMAL);

    while (true)
    {
        cap >> frame; // get a new frame from camera
        cvtColor(frame, edges, COLOR_RGB2GRAY);
        GaussianBlur(edges, edges, Size(7, 7), 1.5, 1.5);
        Canny(edges, edges, 0, 50, 3);
        imshow("edges", edges);
        if (waitKey(30) >= 0) break;
    }
    // the camera will be deinitialized automatically in VideoCapture destructor
}

所需的库:

opencv_core401.lib
opencv_imgproc401.lib
opencv_videoio401.lib
opencv_highgui401.lib