Real time edge detection

Details Real time edge detection Real time edge detection

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

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