Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1997-10-28
1999-09-07
Coles, Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358457, 358456, H04N 140
Patent
active
059499664
ABSTRACT:
A host computer converts an entered gray scale image into a raster image expressing multiple tonal ranges, using an intermediate spot pattern determined in advance. Here, the intermediate spot pattern is a spot pattern composed of pixels which can take only binary value densities with information indicating tonal ranges embedded in the manner of arrangement of the pixels in the spot pattern. Therefore, this raster image logically expresses a large number of tonal ranges which cannot be actually expressed with pixels in binary value densities. A printer receives this raster image from the host computer and converts the intermediate spot pattern in this raster image into an output spot pattern which can assume tertiary values or more in density, thereby printing out a half-tone image actually expressing multiple tonal ranges.
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Coles Edward L.
Lee Cheukfan
Seiko Epson Corporation
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