Apparatus outputting quantized image data, selecting from filter

Details Apparatus outputting quantized image data, selecting from filter Apparatus outputting quantized image data, selecting from filter

1992-09-24

1994-11-08

Ip, Paul

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358446, 358459, 358462, 358443, 382 54, 382 22, G06F 1570

Patent

active

053632109

ABSTRACT:
An image processing apparatus includes an edge detector for detecting whether or not a target pixel of an input image signal is at an edge portion of a discontinuous density image; a first quantizer for generating quantized image data with respect to the target pixel by using a first error spreading filter having a relatively high error spreading effect, such that a density error between the input image signal and an output multilevel image signal is incorporated in "m" neighboring pixels surrounding the target pixel; a second quantizer for generating quantized image data with respect to the target pixel by using a second error spreading filter having a relatively low error spreading effect, such that a density error between the input image signal and the output multilevel image signal is incorporated in "m" neighboring pixels surrounding the target pixel; and a selector for selecting either the quantized image data generated by the first quantizer or the quantized image data generated by the second quantizer in accordance with the result of a detection made by the edge detector.

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patent: 4982285 (1991-01-01), Sugiyama
patent: 5054100 (1991-10-01), Tai
patent: 5068746 (1991-11-01), Ohsawa et al.
patent: 5086484 (1992-02-01), Katayama et al.
patent: 5121447 (1992-06-01), Tanioka et al.
patent: 5157741 (1992-10-01), Katayama
patent: 5179442 (1993-01-01), Azadegan et al.
patent: 5208871 (1993-05-01), Eschbach
patent: 5226094 (1993-07-01), Eschbach

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