Facsimile and static presentation processing – Natural color facsimile – Specific image-processing circuitry
Patent
1994-10-11
1995-11-21
Rogers, Scott A.
Facsimile and static presentation processing
Natural color facsimile
Specific image-processing circuitry
358455, 358456, 358458, 382275, 395109, H04N 152, H04N 1405, G06T 500
Patent
active
054692768
ABSTRACT:
A gray balance correction technique eliminates artifacts, caused by the accumulation of diffusion errors, from a predominantly "gray" tonal area of a halftone image. According to the technique, pixel tonal values associated with three input colors are initially examined to detect a condition that specifies production of a gray image area. Upon detecting this condition, errors from previously processed pixels are averaged prior to being "diffused" among these input color pixels. Thereafter, the input pixels are processed in accordance with conventional halftoning operations and the resulting binary pixel values are passed to an output buffer for printing. Averaging of the errors prior to error diffusion ensures that the detected condition is maintained throughout preprocessing of those input color pixel values.
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Rogers Scott A.
Seiko Epson Corporation
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