Facsimile and static presentation processing – Natural color facsimile – Color correction
Patent
1997-01-09
2000-05-02
Boudreau, Leo H.
Facsimile and static presentation processing
Natural color facsimile
Color correction
358 19, 358298, G03F 308
Patent
active
060579463
ABSTRACT:
An image processing apparatus and method which inputs multivalued image data capable of m-level representation, performs image processing on the input data, and converts the processed data into multivalued image data capable of n-level (m<n) tonality. Upon forming an image on a print medium based on input image data, the image is formed such that the difference between an image density D(x) of the image formed on a print medium at a tonality level x and an image density D(x+1) of an image formed on the print medium at the next tonality level x+1 satisfies D(x+1) -D(x).ltoreq.A.times.D(x) (A.ltoreq.0.08) (A.ltoreq.0.08). Further, a pattern signal having a rectified sine wave having a predetermined period is generated, and a pulse-width modulated signal for generating a beam is generated by performing pulse-width modulation on the input image data based on the pattern signal.
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Atsumi Tetsuya
Honbo Tsunao
Ikeda Yuichi
Nakamura Tetsuya
Sasanuma Nobuatsu
Boudreau Leo H.
Canon Kabushiki Kaisha
Sherali Ishrat
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