Oct 24 2007

More Fun With QR-Codes

Published by at 2:40 pm under Bookmarks,Programming,Technology

This is an old article and the information contained within it may be out of date, not reflect my current views and/or contain broken links. If you feel this article is still valid and requires updating, you can use the contact form to let me know. However, I make no guarantee that it will get updated.

bomb I promise this will be the last post for a while to include a QR-Code.  If you don’t know what a QR-Code is, go read about it on wikipedia.  There are several QR-Code readers out there but I have personally chosen to go with the Kaywa Reader.  I also use the Kaywa QR-Code generator.

The reason for this post was to play with an idea I came up with after reading the Wikipedia article on QR-Codes.  One of the images they show is of an picture encoded into the code.  Whilst I haven’t yet been able to figure out how they encoded the image into the code I have made another discovery.  It turns out that QR-Codes contain a lot of redundancy.  It is possible to loose up to 30% of the code and still be able to read its content.

I’ve found that it is possible to paste an image over the top of the QR-Code.  My experiments so far indicate seem to indicate the image needs to cover less than 30%.  I haven’t had to time to find out how the QR-Codes are structured.  It may be possible in re-structure the data so that more of it can be lost to the embedded image.

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