Two-dimensional barcodes for mobile phones

Sarah Lyons, Frank R. Kschischang
2010 2010 25th Biennial Symposium on Communications  
There are several potential applications for a high data density barcode that can be easily photographed and decoded by mobile phones, but no such symbology currently exists. As a result, a new barcode was designed to exploit the low-pass characteristic of a camera phone channel and is presented as a means of facilitating wireless optical communication with mobile phones. A channel model was established and subsequent simulation results led to the design of a colour barcode with encoding done
more » ... the Discrete Cosine Transform domain. A waterfilling process and a noise-shaping algorithm enhance performance, while a new fast acquisition method allows for rotational and size invariance. An outer Accumulate-Repeat-Accumulate code is employed, followed by an inner Reed Muller code with a rate varying according to spatial frequency. The final barcode data-density is 3.5 times greater than the leading symbology and has proven robust to various impediments imposed by camera phones. ii
doi:10.1109/bsc.2010.5472949 fatcat:zevywgk7ajg4rex34ulmadriri