Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1994-06-06
1996-04-30
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358454, 358463, H04N 140
Patent
active
055130160
ABSTRACT:
In an improved method and apparatus for processing image signals, an input original image signal that contains a periodic pattern is smoothed to obtain a first unsharpness signal which is then processed for sharpness to obtain an output image signal having its edge enhanced and this output image signal is halftoned to obtain a halftone image signal from which a halftone image is reproduced. The mask size used in the smoothing step is computed in accordance with the pitch of said periodic pattern as optionally combined with the factor of scaling for conversion from an input to an output image. Alternatively, said first unsharpness signal is processed for sharpness only when the difference between said first unsharpness signal and the second unsharpness signal which is obtained by smoothing it is greater than a predetermined threshold value. The apparatus is capable of reproducing a sharp image with minimum moire even if the input original image contains a periodic pattern.
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Biosvert Marie-Claire
Coles Sr. Edward L.
Fuji Photo Film Co.
Stoll Thomas L.
Turner Richard C.
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