Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1994-11-08
1997-02-11
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358455, 358458, 358460, 358463, H04N 140
Patent
active
056026536
ABSTRACT:
Image data (10) is represented by a plurality of scan lines (30). Each scan line (30) includes a line of pixels (32) along a fast scan access. Each pixel (32) represents an optical density for a specific location in the image data (10). Pairs of pixels in the fast scan direction of odd numbered scan lines (30) are grouped in even/odd pixel pairs by logic circuit (12). Pairs of pixels of even numbered scan lines (3) are grouped in odd/even pixel pairs such that the groupings in adjacent lines are offset. Each pixel pair contains n addressability units defining a halftone cell. The addressability units of the pixel pair are combined. A propagated error value from a previous pixel pair and the data values of each pixel pair are combined and used to address a memory location in a look-up table (14). The memory location contains a corresponding binary data value representing an intensity level for each pixel of the pixel pair. The binary data is outputted to a gray modulator (16) to be printed by a printer (18). The outputted data grid is equivalent to a very high frequency halftone screen having a Moire pattern not visually perceivable.
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Coles Sr. Edward L.
Stoll Thomas L.
Xerox Corporation
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