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Store data on paper with Twibright OptarStore data on paper with Twibright OptarPosted Aug 4, 2007 13:29 UTC (Sat) by pimlottc (guest, #44833)In reply to: Store data on paper with Twibright Optar by elicriffield Parent article: Store data on paper with Twibright Optar
PARC has a (non-free) 2D barcode system called Dataglyphs, composed of patterns of simple fore- and back-slashes, which can be used as halftone dots, changing their thickness, lengths and colors as needed to render an image. It's very nice and unobtrusive, especially at high resolution. There's a bunch of example images on their webpage and even an interactive demo page where you can encode and decode your own test images. The density is not as good - 1 KB/inch^2 @ 600 dpi (comes to 96KB for an A4 page) - but the simplicity of the patterns makes it fade easily into the background and allows for a good amount of alteration for aesthetic purposes which still being machine-recognizable.
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