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I need to develop an application which detects QR codes through a webcam. I have been working with OpenCV and Visual Studio 2010, detecting squares in general. Then I found a library called "libdecodeqr" which you can use with OpenCV. With this library there is an example (the name is "webcam") to detect and decode QR codes using a webcam and it works succesfully, but if there are various QR codes on the screen or paper, the application only recognizes a QR code,not the rest. I would like to know where I can find the algorithm to detect QR codes (something similar to the "square.cpp" in OpenCV) or the steps to develop it.

Thanks in advance.

Lucía
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  • I am new in OpenCv and C++, that's why I need help to develop the application. I have been searching information, I have read the ISO/IEC 18004 and other documents about QR codes, but I don't understand very well the steps of the decode algorithm and I don't know if that algorithm is what I need to recognize QR codes through a webcam. – Lucía Jul 20 '11 at 09:37

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Try the ZBar library, it's also very easy to use and here you can find how to use it with OpenCV. It works fine for me but you should be aware of the typo in the example:

It's (char*)img->data.ptr, not (char)img->data.ptr.

Community
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Eingehirner
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  • Just as an add-on; I made a reduced version of zbar with no dependencies and a working vs build environment (without the need for mingw/cygwin). It also includes a nice and clean interface, so you might want to give it a try: http://code.google.com/p/zbar-redux/ – Oliver Zendel Dec 14 '12 at 10:14