Mac 上的 OpenCV 无法打开 USB 网络摄像头

2021-12-10 00:00:00 opencv macos webcam c++

我使用 OpenCV 的 VideoCapture.open(int) 获取视频捕获失败来自我的 MacBook Pro 中的 USB 网络摄像头，运行 MacOS X v10.7 (Lion).使用 open(0) 成功从 iSight 摄像头获取捕获.但我没有找到网络摄像头.

I have been unsuccessful using OpenCV's VideoCapture.open(int) to get video capture from a USB web cam in my MacBook Pro running Mac OS X v10.7 (Lion). Using open(0) successfully gets capture from the iSight camera. But I didn't have any luck trying to find the WebCam.

网络摄像头已安装并与 Skype 和 macam 驱动程序.

The WebCam is installed and works well with Skype, and the macam driver application.

这是我正在使用的部分代码:

Here is a portion of the code that I'm using:

VideoCapture cap; 
for (int i = 1; i < 1500; i++) {
    if (cap.open(i))
    {
        cout << "Found camera %d
" << i;
        break;
    }
}
if(!cap.isOpened()) {  // Check if we succeeded
    return -1;
}

如果我用 0 初始化 i，它会立即找到 iSight 摄像头.如果我用 1 初始化 i，那么当 i = 500 时它会再次找到 iSight.

If I initialize i with 0 it immediately finds the iSight camera. If I initialize i with 1, then it finds iSight again when i = 500.

我该如何解决这个问题?

How can I fix this problem?

推荐答案

尝试在没有以下行的情况下运行您的代码:break;.可能您会发现不止一台相机，其中一台是网络摄像头.
请注意，cap.open 的参数不仅是相机的数量 - 它还定义了您要使用的 API:

Try to run your code without this line: break;. Probably you will find more than just one camera, and one of them will WebCam.
Note that parameter of cap.open is not only the number of camera - it also defines which API you want to use:

摄像头调度方式:index为摄像头编号.

Camera dispatching method: index is the camera number.

  • 如果给定一个从 0 到 99 的索引，它会尝试找到第一个
  • 可以访问给定相机索引的 API.
  • 添加 100 的倍数以选择 API(来自 cap.cpp 的评论)

可能性(取自 highgui_c.h):

Possibilities (taken from highgui_c.h): 

CV_CAP_ANY      =0,     // autodetect  
CV_CAP_MIL      =100,   // MIL proprietary drivers  
CV_CAP_VFW      =200,   // platform native  
CV_CAP_V4L      =200,
CV_CAP_V4L2     =200,  
CV_CAP_FIREWARE =300,   // IEEE 1394 drivers  
CV_CAP_FIREWIRE =300,  
CV_CAP_IEEE1394 =300,  
CV_CAP_DC1394   =300,  
CV_CAP_CMU1394  =300,  
CV_CAP_STEREO   =400,   // TYZX proprietary drivers  
CV_CAP_TYZX     =400,  
CV_TYZX_LEFT    =400,  
CV_TYZX_RIGHT   =401,  
CV_TYZX_COLOR   =402,  
CV_TYZX_Z       =403,  
CV_CAP_QT       =500,   // QuickTime  
CV_CAP_UNICAP   =600,   // Unicap drivers  
CV_CAP_DSHOW    =700,   // DirectShow (via videoInput)  
CV_CAP_PVAPI    =800,   // PvAPI, Prosilica GigE SDK  
CV_CAP_OPENNI   =900,   // OpenNI (for Kinect)  
CV_CAP_OPENNI_ASUS =910,   // OpenNI (for Asus Xtion)  
CV_CAP_ANDROID  =1000,  // Android  
CV_CAP_XIAPI    =1100,   // XIMEA Camera API  
CV_CAP_AVFOUNDATION = 1200  // AVFoundation framework for iOS (OS X Lion will have the same API)

可能 CV_CAP_AVFOUNDATION = 1200 是你正在寻找的 - 尝试从 1200 开始循环，不要忘记删除 break; 我认为你会找到您要找的东西.

Probably CV_CAP_AVFOUNDATION = 1200 is what you are looking for - try to start you loop from 1200 and don't forget to remove break; and I think that you will find what you are looking for.

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