Correlating optical motion detector

Details Correlating optical motion detector Correlating optical motion detector

1984-01-20

1986-12-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340710, G01V 904

Patent

active

046314008

ABSTRACT:
An optical mouse utilizing a linear array of photodiodes is provided with circuitry to correlate during each self-timed cycle a new image with a stored image from the previous cycle with the new image offset relative to the stored image one pixel (photodiode signal) to the right, one pixel to the left, and also with no offset. All three correlations are done at the same time in separate correlators. Decision as to motion to the right, to the left or no motion is made on the basis of maximum correlation output. The new image is not stored in a second store array for use during the next cycle until any motion is detected, but it is stored in a first store array during the cycle when half the precharged photodiodes discharge below a predetermined level in response to incident light. A new cycle is initiated by precharging the photodiodes when any decision of motion or no motion is made.

REFERENCES:
patent: 4270143 (1981-05-01), Morris
patent: 4296434 (1981-10-01), Drewery et al.
patent: 4514726 (1985-04-01), Whetstone et al.
patent: 4521772 (1985-06-01), Lyon
patent: 4521773 (1985-06-01), Lyon
patent: 4527894 (1985-07-01), Geode et al.
Richard F. Lyon, "The Optical Mouse, and an Architectural Methodology for Smart Digital Sensors, Xerox, Palo Alto Research Center, Aug. 1981.

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