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copied!<p>If you are looking for particular shapes inside a larger image then <a href="http://opencv.willowgarage.com/wiki/" rel="nofollow">OpenCV</a> is a great alternative. <a href="http://www.emgu.com/wiki/index.php/Main_Page" rel="nofollow">Emgu.CV</a> is a good .Net wrapper for it. See <a href="http://blog.tedd.no/2011/03/12/kinect-opencv-object-recognition/" rel="nofollow">my picture of a SURF implementation</a> for this. Also see <a href="http://opencv.willowgarage.com/documentation/c/imgproc_structural_analysis_and_shape_descriptors.html?highlight=cvconvexitydefects#cvConvexityDefects" rel="nofollow">other options in OpenCV</a>, it has plenty to offer. Note that this approach requires a lot of processing power.</p> <p>If you can easily identify the shape you want as a BLOB (that is, give the algorithm a picture of only this shape) you can do a search for "ANN OCR" ("Artificial Neural Networks" and "Optical Character Recognition"). Many (most?) ANN-implementations come with sample code for feeding it shapes (letters) and recognizing closest shape (hand written letters). For example <a href="http://www.codeproject.com/KB/cs/neural_network_ocr.aspx" rel="nofollow">Neural Network OCR</a>. I believe this approach would solve your problem. (Sidenote: I've encountered and tested numerous libs that can do this. It's Neural Networks 101.)</p> <p>If you need BLOB algorithms for the ANN-OCR OpenCV can provide this.</p> <p>Both these approaches are farily easy to implement.</p>

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