Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1998-04-30
1999-11-30
Lee, John R
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502081, 250234, 25055944, 345158, 345163, 382313, G06K 1118
Patent
active
059947101
ABSTRACT:
A scanning mouse has two optical navigation sensors to allow measurement of both translation and rotation of the scanning mouse. It also has an image sensor, and the ability to digitize the sensed image data. There may be a second image sensor at perpendicular to the first. A high speed digital data path connects the scanning mouse to the computer. Software in the computer processes image line data that includes the locations of the navigation sensors and the digitized image data to produce partial scanned images that are further assembled into a complete image within the environment of the computer. Each optical navigation sensor images as an array of pixels the spatial features of generally any micro textured or micro detailed work surface below the mouse. The photo detector responses are digitized and stored as a frame into memory. Motion produces successive frames of translated patterns of pixel information, which are compared by autocorrelation to ascertain the direction and amount of movement. A hold feature suspends the production of movement signals to the computer.
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Davis Bradley K.
Knee Derek L.
Hewlett--Packard Company
Lee John R
Miller Edward L.
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