Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-10-27
1990-11-20
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358166, 358162, H04N 514
Patent
active
049722620
ABSTRACT:
A detector for detecting, in images of camera scanned scenes, edges which extend generally parallel to the scanning lines. Accordingly, by comparing an undelayed signal to a first signal delayed by slightly more than one scan line, a differential can be obtained at a 45 degree angle going downward from the left to the right of the image. By delaying a second signal slightly less than one scan line, the differential becomes 45 degrees going downward from the right to the left of the image. These differentials are utilized to detect edges extending parallel to the scan lines.
REFERENCES:
patent: 3328761 (1967-06-01), Yamamoto et al.
patent: 3609685 (1971-09-01), Deutsch
patent: 3708753 (1973-01-01), Radecke
patent: 4020463 (1977-04-01), Himmel
Atlass Michael B.
Groody James J.
Harvey David E.
Honeywell Inc.
Mersereau C. G.
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