I am trying to develop an android application to decode QR codes, however i do not want to use libraries such as zxing, i must implement it. The main problem i am having is how to perfectly extract a QR code from taking a picture of it so that it can be perfectly aligned. It is very easy to decode a qr code if it is perfectly aligned, however when you take a picture with a mobile camera, it may be rotated and not perfectly aligned. Please help!
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