Edge extraction technique

Details Edge extraction technique Edge extraction technique

1984-09-04

1987-01-20

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 382 22, 382 54, H04N 140

Patent

active

046383697

ABSTRACT:
An improved edge extraction technique for use in copying a halftone original to produce a halftone copy is described. The prior art uses a two path system to rescreen a halftone, a filter path to remove the original screen and an edge extraction path to enhance the edges. The final gray scale signal, before rescreening, is the addition of the outputs of the two paths. This invention is an improved edge extraction technique for use in such a system. First, the sign and magnitude of horizontal and vertical edges is computed. Then a root mean square of these values is taken to provide a two dimensional enhancement. Next, the enhancement is tested against certain thresholds to test whether the value is a result of image noise, or whether there is a probability that a small enhancement may be in the wrong direction. Finally, the enhancement is added to the filter path output.

REFERENCES:
patent: 4115816 (1978-09-01), Moe et al.
patent: 4259694 (1981-03-01), Liao

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