How to count cameras in OpenCV 2.3?

Question

I want to get the number of available cameras.

I tried to count cameras like this:

for(int device = 0; device<10; device++) 
{
    VideoCapture ca         


        

Answer 1

Even if it's an old post here a solution for OpenCV 2/C++

/**
 * Get the number of camera available
 */
int countCameras()
{
   cv::VideoCapture temp_camera;
   int maxTested = 10;
   for (int i = 0; i < maxTested; i++){
     cv::VideoCapture temp_camera(i);
     bool res = (!temp_camera.isOpened());
     temp_camera.release();
     if (res)
     {
       return i;
     }
   }
   return maxTested;
}

Tested under Windows 7 x64 with :

• OpenCV 3 [Custom Build]
• OpenCV 2.4.9
• OpenCV 2.4.8

With 0 to 3 Usb Cameras