從Macbook Pro iSight與Opencv捕獲

Question

我試圖從Macbook Pro的iSight使用OpenCV 2.4.6捕獲幀，並在Xcode上使用Apple LLVM 4.2編譯器構建。

但是，我沒有收到任何幀。通常我會設置一個while循環來運行，直到幀已滿，但下面的運行時間約爲30秒，沒有結果。我怎樣才能調試呢？

void testColourCapture() { 

    cv::VideoCapture capture = cv::VideoCapture(0); //open default camera 
    if(!capture.isOpened()) { 
     fprintf(stderr, "ERROR: ColourInput capture is NULL \n"); 
    } 
    cv::Mat capFrame; 

    int frameWaits = 0; 
    while (capFrame.empty()) { 
     capture.read(capFrame); 
     //capture >> capFrame; 
     cvWaitKey(30); 
     frameWaits++; 
     std::cout << "capture >> capFrame " << frameWaits << "\n"; 
     if (frameWaits > 1000) { 
      break; 
     } 
    } 
    imshow("capFrame", capFrame); 

} 

我確定它不是多線程的。另外，capture.isOpened總是返回true。

編輯：看來人都有過這樣的問題：OpenCV wont' capture from MacBook Pro iSight

編輯：我安裝OpenCV的程序是：

$ sudo的港口自更新

$ sudo的港口安裝OpenCV

然後，我將libopencv_core.dylib，libopencv_highgui.dylib，libopencv_imgproc.dylib和libopencv_video.dylib拖放到我的Xcode項目的Frameworks文件夾中，從/ opt/local/lib

Answer 1

OpenCV 2.4.6已損壞，無法與iSight攝像頭一起使用。所以請安裝2.4.5。我已經寫了一步的步指南，瞭解此：http://accidentalprogramming.blogspot.ch/2013/10/opencv-installation-on-mac-os-x.html

Answer 2

我得到了它與下面的代碼工作：

VideoCapture cap = VideoCapture(0); // open the video file for reading 

if (!cap.isOpened()) // if not success, exit program 
{ 
    cout << "Cannot open the video file" << endl; 
    return -1; 
} 

//cap.set(CV_CAP_PROP_POS_MSEC, 300); //start the video at 300ms 

double fps = cap.get(CV_CAP_PROP_FPS); //get the frames per seconds of the video 

cout << "Frame per seconds : " << fps << endl; 

namedWindow("MyVideo",CV_WINDOW_AUTOSIZE); //create a window called "MyVideo" 

while(1) 
{ 
    Mat frame; 

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

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

    imshow("MyVideo", frame); //show the frame in "MyVideo" window 

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