Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-06-25
1994-08-09
Ip, Paul
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358456, 340 71, H04N 123
Patent
active
053371623
ABSTRACT:
An image processing apparatus in which a multilevel image signal generated from an original image by a scanner is input and processed so as to produce multilevel image data describing a gray level of each pixel of an output image, includes a detection part for repeatedly detecting a peak of a multilevel image signal generated by a scanner and a valley thereof with respect to pixels of the original image aligned in a scanning direction of the scanner, and for outputting the peak of the multilevel image signal and the valley thereof, and a correction part for correcting a gray level of the multilevel image data with respect to each of the pixels depending on a difference between the peak and the valley, so as to reduce changes in gray level of pixels of the output image.
REFERENCES:
patent: 4468704 (1984-08-01), Stoffel et al.
patent: 4731863 (1988-03-01), Sezan et al.
patent: 4912569 (1990-03-01), Petilli
patent: 4984097 (1991-01-01), Shu
patent: 4987495 (1991-01-01), Arai
patent: 5055942 (1991-10-01), Levien
Ip Paul
Ricoh & Company, Ltd.
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