Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1995-06-07
1997-06-24
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358447, 358298, 358456, 358457, 358463, 358532, 358448, 358453, 382272, 382273, H04N 140, H04N 121, H04N 138, H04N 146
Patent
active
056422040
ABSTRACT:
An improved error diffusion method for incorporating into a halftoning algorithm for processing gray scale images to counterpart binary images. The improved error diffusion method adopts a tone scale function to process the input gray scale image before proceeding with the halftoning (error diffusion) processing in order to improve the image darkening problem caused by the conventional error diffusion method and a noise correction process to eliminate the background noises resulted from the accumulated error of the conventional error diffusion method. The proceeding of the tone scaling process and the halftoning process are parallel with the correction process so that errors generated in either one will not affect the other.
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Coles Sr. Edward L.
Harris Tia M.
Industrial Technology Research Institute
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