Dot image discrimination circuit for discriminating a dot image

Details Dot image discrimination circuit for discriminating a dot image Dot image discrimination circuit for discriminating a dot image

1993-03-22

1994-08-23

Coles, Sr., Edward L.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358462, 382 9, H04N 140, H04N 146

Patent

active

053412273

ABSTRACT:
In a dot image discrimination circuit, a dot image in an area composed of many multi-tone pixels including a central pixel is discriminated. A pixel (change point) at which the density of the image data is prominent in a first direction is detected in a plurality of pixels. Then, it is inspected if change points exist continuously in a second direction perpendicular to the first direction. The change points are counted in an area of a prescribed size around the central pixel, but some change points existing continuously in the second direction are not counted. Thus, a pixel in an image made of regular dots can be discriminated from a pixel in another type of image such as a character image. The discrimination of a dot image can be performed fast and precisely.

REFERENCES:
patent: 4722008 (1988-01-01), Ibaraki et al.
patent: 5193122 (1993-03-01), Kowalski et al.

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