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L'une des contraintes les plus complexes a resoudre lorsqu'on developpe une application web consiste a ne pas generer deux fois la meme page. Pour y parvenir, la plupart des developpeurs ont recours a
http://bokode.com We present a new low-cost optical design so that the tags can be shrunk to 3mm visible diameter, and unmodified ordinary cameras several meters away can be set up to decode the identity plus the relative distance and angle. The design exploits the bokeh effect of ordinary cameras lenses, which maps rays exiting from an out of focus scene point into a disk like blur on the camera sensor. We show that an off-the-shelf camera can capture Bokode features of 2.5 microns from a distance of over 4 meters. We use intelligent binary coding to estimate the relative distance and angle to the camera, and show potential for applications in augmented reality and motion capture.