OpenCV, or Open Computer Vision, is an open-source project to open up computer vision to the masses. Computer Vision is a process where a computer receives images from a camera somewhere, interprets these as an array or matrix, and does some math to analyze them. Sometimes the math is simple, like "find the orange circle, and the green circle, then line them up." Sometimes it's more difficult.
Suddenly I realize we can make red and green circles on the walls with LEDs. Can we make "different colors" of infrared light with LEDs? Is anyone making infrared CCDs yet?
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