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    <p>The relevant snippet of the error message is <code>Unrecognized or unsupported array type in function cvGetMat</code>. The <code>cvGetMat()</code> function converts arrays into a <code>Mat</code>. A <code>Mat</code> is the matrix data type that OpenCV uses in the world of C/C++ (Note: the Python OpenCV interface you are utilizing uses Numpy arrays, which are then converted behind the scenes into <code>Mat</code> arrays). With that background in mind, the problem appears to be that that the array <code>im</code> you're passing to <code>cv2.imshow()</code> is poorly formed. Two ideas:</p> <ol> <li><p>This could be caused by quirky behavior on your webcam... on some cameras null frames are returned from time to time. Before you pass the <code>im</code> array to <code>imshow()</code>, try ensuring that it is not null.</p></li> <li><p>If the error occurs on <em>every</em> frame, then eliminate some of the processing that you are doing and call <code>cv2.imshow()</code> immediately after you grab the frame from the webcam. If that still doesn't work, then you'll know it's a problem with your webcam. Else, add back your processing line by line until you isolate the problem. For example, start with this:</p> <pre><code>while True: # Grab frame from webcam retVal, image = capture.read(); # note: ignore retVal # faces = cascade.detectMultiScale(image, scaleFactor=1.2, minNeighbors=2, minSize=(100,100),flags=cv.CV_HAAR_DO_CANNY_PRUNING); # Draw rectangles on image, and then show it # for (x,y,w,h) in faces: # cv2.rectangle(image, (x,y), (x+w,y+h), 255) cv2.imshow("Video", image) i += 1; </code></pre></li> </ol> <p>source: <a href="https://stackoverflow.com/questions/3940780/opencv-c-video-capture-does-not-seem-to-work">Related Question: OpenCV C++ Video Capture does not seem to work</a></p>
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    1. USBrandon Jackson
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    1. COThanks A lot, I was eagerly waiting for your reply.Yes it have some problem in cv2.imshow.And when i try to print image, it is None.IS it the problem of webcam? But it works fine for my simple video capture code of old version. When i try individually printing, it shows >>> capture <VideoCapture 0x2c949d0> >>> cascade >>> print image <None>. What should I Do??
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    2. COwhere are you printing the image? If it is None right after capture.read(), then check the retVal variable which may contain an error code. Else tell me where you're printing it.
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    3. COI am using python Idle as editor and when i print it gives as none and retVal as False.
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