Wednesday, October 5, 2011

Embedding images in QR codes

In class we discussed qr codes and saw some examples of qr codes with embedded logos or other artwork. Looking into this, I found at http://hackaday.com/2011/08/11/how-to-put-your-logo-in-a-qr-code/ a nice overview that shows which areas of the qr code can be safely modified. With error correction, you can obscure up to 30% of the data and still have a functioning code. Unfortunately, I really couldn't find any more reliable technique than trial and error, so I just had to give it a try. I removed sections from the middle of the qr code and populated it with the GIMP bell pepper, just to see if it would still work. It turns out you can remove quite a bit of the pattern and still have a functioning code.



If you don't have a reader, you can read codes at http://zxing.org/w/decode.jspx

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