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A system and method for using cameras to download data to cell phones or other devices as an alternative to CDMA/GPRS, BlueTooth, Infrared or cable connections. The data is encoded as a sequence of images such as 2D bar codes, which can be displayed in any flat panel display, acquired by a camera, and decoded by software embedded in the device. The decoded data is written to a file. The system and method meet the following challenges:(1) To encode arbitrary data as a sequence of images.(2) To process captured images under various lighting variations and perspective distortions while maintaining real time performance.(3) To decode the processed images robustly even when partial data is lost.