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http://www.asquare.org/networkresearch/?p=228

Each image shows an individual black and white pattern which has been painted manually with an edding 850. These patterns have been created by a special software on a computer. It is possible for any visitor to decode each “Semacode” by using a standard camera phone…Semacode makes it posssible to encode a specific amount of data within the pixel pattern. This string of data can be decoded from an image taken by the camera phone afterwards…For the users it serves as a tool to get simple access to websites on a mobile phone. Equiped with the software the user navigates to websites by just taking a photo of a semacode which has the specific webadress encoded.