Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-03-17
1994-06-14
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358462, H04N 140
Patent
active
053215265
ABSTRACT:
In the white level detection circuit for an optical image reader, for a low value portion in an image, the white level signal corresponding to an image signal of a high value background portion which precedes to the low value portion is held steady. Accordingly, even if the low value image portion has a long duration, the white level signal may be kept at a proper value for the image signal corresponding to the low value image signal. For the high value background portion, the white level signal that immediately follows a variation of the image signal can be obtained. Therefore, a proper white level signal can be generated for the background portion. Various processing applied to the image signal on the basis of the white level signal may be performed in a satisfactory manner. As a consequence, the read performance of the optical image reader may be remarkably improved.
REFERENCES:
patent: 4234867 (1980-11-01), Butin
patent: 4481666 (1984-11-01), Niwa
patent: 4486781 (1984-12-01), Wilmer et al.
patent: 4680624 (1987-07-01), Murakami
patent: 4811101 (1989-03-01), Yagi
patent: 4829379 (1989-05-01), Takakai
patent: 5060083 (1991-10-01), Ueno
Burgess Glenton B.
Groody James J.
Sumitomo Electric Industries Ltd.
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