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So I have been using OpenCV and Affdex SDK to capture image and process emotion. But when the camera is in use by another application then 

        // Capture an image from the camera
        cv::Mat frame_image;
        if (!video_capture.read(frame_image)) {}

read still returns true but however frame_image.data contains garbage value in debug version but in release version it's empty. I had been using this code in release version to detect if the data is empty:

bool CEmotionTracker::is_frame_data_empty(const uchar *frame_data) const
{
if (frame_data && frame_data[0] == '\0')
    return true;

return false;
}

but this won't work in debug version because of garbage value and I don't think it's a good idea to check if data contains garbage value to determine if it contains a valid frame data or not. Is there any way to check if frame_image.data contains valid data or not?

Edit:

frame_image.empty() will return false so it's not what I am looking for

Asesh
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  • I don't think `frame_image.data` would indicate you about the garbage values any way. So a better way would be keep a check is the camera is already being used by another application before capturing the frame. – ZdaR Jun 22 '17 at 16:54
  • Thanks for replying. Is there any API to find out if the camera is being used by another app? video_capture.isOpened() will still return true if the camera is being used by another app that's why I used is_frame_data_empty to check if it contains empty data or not – Asesh Jun 23 '17 at 03:23

0 Answers0