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We will take a small device (available for $100 at Dallas Semiconductor), about the size of an iPod Shuffle, but capable of executing Java-Byte-Code, and connect it to a digital toy camera, (available for about $10 on eBay).
Then we are going to write some Java code that we load on to the device and execute and even run some JUnit tests remotely. But be warned, we are targeting an 8-bit processor running at only 40 MHz and its 1MB SRAM serves as file-system, program memory, and runtime heap.
Along the way we may add some more hardware and learn a few things about how CMOS sensors capture image data and how a Bayer-pattern can be used to decode the sensor data.