Image processing system and method employing hybrid filtering to

Details Image processing system and method employing hybrid filtering to Image processing system and method employing hybrid filtering to

1991-12-31

1994-08-16

Chilcot, Jr., Richard E.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358457, 358461, 358462, 358447, 382 54, H04N 140

Patent

active

053391705

ABSTRACT:
An image processing system converts screen structured halftone images to continuous tone images. Value data is sequentially generated for successive pixels of a halftone image. An averaging filter is provided for sequentially filtering each pixel in the halftone image in the horizontal image direction in accordance with a first predetermined filter to generate an intermediately filtered image. A pattern matching filter then sequentially filters each pixel in the intermediately filtered image in the vertical direction to generate a hybrid filtered image. The hybrid filter arrangement is then iteratively operated for three additional sets of orthogonal directions, i.e. the vertical and horizontal directions, a first diagonal direction and a second diagonal direction, and the second and first diagonal directions. The best hybrid image is generated as an output continuous tone image for storage and/or processing to a halftone copy or print.

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