Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1996-05-30
1998-09-22
Wong, Peter S.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358443, G02B 2608, G03B 2156
Patent
active
058122745
ABSTRACT:
An image signal processing apparatus to realize signal processing system and apparatus constitution, where an image signal inputted using a photoelectric conversion element such as a CCD or a contact type image sensor is obtained in circuit constitution of small scale with high picture quality. In order to solve the problems, data width of a signal referred to in a shading corrector, an MTF corrector and an error diffusion circuit is made b+f+j.ltoreq.8 per one pixel. Or error component commonly possessed by plural pixels (N pixels) in the error diffusion circuit is made b+f+j'.ltoreq.8, data width per one pixel being made j'=j/N. Image signal processing is realized in this constitution, thereby data width of a signal referred to in respective signal processings is reduced, and an image signal satisfying accuracy of signal processing sufficiently and having high picture quality can be obtained. For example, when a circuit is constituted by LSI, the memory section can be easily mounted on the same LSI. A memory required in the image signal processing can be made 8 bits per one pixel and a cheap memory constitution can be utilized.
REFERENCES:
patent: 5091965 (1992-02-01), Kobayashi et al.
patent: 5130822 (1992-07-01), Nagata et al.
patent: 5262873 (1993-11-01), Ishizuka
patent: 5555095 (1996-09-01), Inuzuka et al.
Inuzuka Tatsuki
Kojima Yasuyuki
Nakamura Toshiaki
Shinoda Shinichi
Hitachi , Ltd.
Law Patrick B.
Wong Peter S.
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