Opening 720p webcam with OpenCV 2.4.5 (and unicap) [closed]
 
  
 
  
 
 
 
 
 
 asked Jul 2 '13 
 
 NikolasE gravatar image  
 
 
 
 
 
Hello
 
I just reinstalled OpenCV to activate TBB and also added the unicap option during cmake. So far, I used a webcam that can provide 1280x720 images. So far, I used 
 
  cap = VideoCapture(1);
  cap.set(CV_CAP_PROP_FRAME_HEIGHT,720);
  cap.set(CV_CAP_PROP_FRAME_WIDTH,1280);
 
to connect to the camera which worked perfectly. If I now try to open the stream as before, no Image is read (cap.read(rgb) does not return). If I uncomment the cap.set lines, I get a 720p image, but only the upper left 640*480 pixels contain the full image and the rest is just black. 
 
I am not sure if unicap has something to do with it, so it's just a guess. 
Has anyone experienced this problem before?
 
Cheers, 
    Nikolas 
 
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Closed for the following reason
      question is not relevant or outdated by
      sturkmen 

      close date 2020-10-04 15:04:36.275321
 
 
Comments
Could you try using: Mat rgb; cap >> rgb;
to see if this solves the problem. Using this all formatting is done correctly and automatic with preset properties. It works for me.
StevenPuttemans gravatar imageStevenPuttemans (Jul 3 '13)edit
no, same behavior. (I just get a VGA image)
NikolasE gravatar imageNikolasE (Jul 3 '13)edit
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