Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-05-26
1990-05-15
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358456, 358298, H04N 140
Patent
active
049262670
ABSTRACT:
A method and system for reproducing halftone originals utilizing threshold gray level values of the scanned pixels of the halftone original to determine adjacent pairs of pixels bordering the edges of the halftone dots. Edge errors for the adjacent pairs of pixels are determined using the scanned gray level values and a threshold value. A processing window defines sub-arrays of pixels whose thresholded gray level values are processed based on the edge errors. For each sub-array, the edge errors of the adjacent pairs of pixels are summed. The thresholded values of the adjacent pairs of pixels are then selectively changed in the order of pixel pairs of descending edge error until the number of values changed equals the closest integer to the summed edge error.
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Shu Joseph S.
Springer Robert
Yeh Chia L.
Coles Sr. Edward L.
Kirk Douglas
Nynex Corporation
Torrente John J.
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