Method and device for image analysis

Details Method and device for image analysis Method and device for image analysis

1981-12-28

1983-11-29

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358213, 358267, 382 59, H04N 110

Patent

active

044183623

ABSTRACT:
A device for image analysis comprising scanner (1) for producing a video signal indicative of the light intensity received at successive regular time intervals from an image scanned along a first direction at an automatically controlled known motion velocity and along a second direction at an unknown motion velocity, characterized in that it further comprises circuits (2,5) for determining a reference contrast value from the difference between light intensities received from points of the image scanned along the first direction, circuits (3,6) for determining a variable contrast value from the difference between light intensities received from points of the image scanned along the second direction, circuit (7) for comparing the variable contrast value with the reference contrast value, and circuits (8,10) for using the comparison for compensating for the unknown motion velocity in the production of the video signal.

REFERENCES:
patent: 3976973 (1976-08-01), Martin et al.
patent: 4260979 (1981-04-01), Smith
patent: 4327377 (1982-04-01), Takken

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