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enter image description here

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Can anyone explain it ?

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migrated from stackoverflow.com Feb 12 '11 at 15:18

This question came from our site for professional and enthusiast programmers.

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The optical mouse has a chip that has a lo-res camera in it, with a DSP. The DSP picks off certain high-contrast bits of the image in one frame, and looks at how they've tracked across the field of view in the next image. From this it infers X and Y motion, and reports the position change to the computer through a USB interface. The LED provides illumination to increase contrast on the surface, so there will be more bright spots the DSP can pick off.

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