Method of and apparatus for detecting pixels constituting dotted

Details Method of and apparatus for detecting pixels constituting dotted Method of and apparatus for detecting pixels constituting dotted

1995-11-15

1998-05-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358448, 358467, 382224, H04N 140

Patent

active

057543127

ABSTRACT:
Disclosed is an apparatus for detecting pixels in a dotted image area (dotted area pixels). Image data corresponding to each of the pixels is coded into one of a predetermined number of discrete values. The distance between change points at which the value of the pixel after the coding is changed from a first value to a second value is detected. Further, it is examined whether or not periodicity is recognized in the distance between the change points in the vicinity of a target pixel. If periodicity is recognized in the distance between the change points, it is judged that the target pixel may constitute a dotted image area.

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Patent Abstracts of Japan, vol. 17, No. 174, 5 Apr. 1993, 04-330869, 18 Nov. 1992.
European Search Report No. 95118318 completed Nov. 29, 1996.

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