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I tested several optical mice and wondered whether they really Take Pictures of their surface or only of the reflecttion of the LED or LASER that is emitted from the mouse?

  1. If mice take a picture every millisecond or less then where are the pictures saved?

  2. Can we access the pictures from the computer?

  3. If the pictures are processed by a DSP(digital signal processor) then why is it that on some surfaces optical mice don't detect the movement of the mouse but laser mice do detect it? (source)

  4. I tested that on some surfaces like wood that has a wooden pattern optical mice don't work, however they work on completely black mouse pads?

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A simple web search answers your question: computer.howstuffworks.com/question631.htm –  Ben Richards Apr 17 '13 at 20:52
    
i read this before don't you see "source" in my description ? –  shotgunner Apr 17 '13 at 20:57
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2 Answers

Optical mice don't save any pictures to your computer, so there is no way for you to access them, unless you were to somehow rewire the mouse's hardware. Even if you could access the pictures, they would be very low resolution because the mouse has a very low resolution video camera.

See http://en.wikipedia.org/wiki/Optical_mouse for more info.

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Suggest google and How Stuff Works.

Optical mice don't take pictures that are saved anywhere. They use two images to compare them to each other and then throw away the old one to make room for the next image.

The technology underlying the modern optical computer mouse is known as digital image correlation, a technology pioneered by the defense industry for tracking military targets. Optical mice use image sensors to image naturally occurring texture in materials such as wood, cloth, mouse pads and Formica. These surfaces, when lit at a grazing angle by a light emitting diode, cast distinct shadows that resemble a hilly terrain lit at sunset. Images of these surfaces are captured in continuous succession and compared with each other to determine how far the mouse has moved.

Some surfaces reflect that light better than others.

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the optical mouse actually uses a tiny camera to take 1,500 pictures every second –  shotgunner Apr 17 '13 at 20:55
    
updated to be more specific. –  Brad Patton Apr 17 '13 at 21:03
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