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11355217
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2012-07-06T02:48:52.473
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2012-07-06T02:48:52.473
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2017-05-23T11:48:21.040
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176769
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text
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Understand that most of the C interface of OpenCV deals with <code>IplImage</code>, not <code>Buffer</code> nor any other custom data type. In other words, doing: <pre><code>Buffer B = Buf; cvThreshold( B, B, 200, 255, CV_THRESH_BINARY ); </code></pre> will issue a compiling error because <code>cvThreshold()</code> requires the data to be encapsulated in an <code>IplImage</code>. I don't want to run the risk of being Captain Obvious, but you need to convert <code>Buffer</code> to <code>IplImage</code>. So how do you do that, one might ask. Well, <code>IplImage</code> is simple data type that holds these important pieces of information together: <ul> <li>The size of the image (width/height);</li> <li>The bit depth of the image;</li> <li>The number of channels;</li> <li>And the data (pixels) of the image;</li> </ul> And <a href="https://stackoverflow.com/a/10125322/176769">how do you create a <code>IplImage</code> from scratch</a>? Call <a href="http://opencv.willowgarage.com/documentation/operations_on_arrays.html#createimageheader" rel="nofollow noreferrer"><code>cvCreateImageHeader()</code></a> followed by <a href="http://opencv.willowgarage.com/documentation/operations_on_arrays.html?highlight=cvsetdata#cvSetData" rel="nofollow noreferrer"><code>cvSetData()</code></a>. Note: for the depth parameter, you might want to use either <a href="http://opencv.willowgarage.com/documentation/basic_structures.html#iplimage" rel="nofollow noreferrer">IPL_DEPTH_16U or IPL_DEPTH_16S</a>. If your image is RGB, the number of channels is 3. After you are done using the <code>IplImage</code>, don't forget to call <code>cvReleaseImage()</code> to free it's resources. I believe the real challenge is: how will you extract all these information from <code>Buffer</code>. Good luck!
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