Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1986-05-02
1989-05-23
Groody, James J.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 29, 358 75, 358163, G03F 308, H04N 146, H04N 5228, H04N 973
Patent
active
048335339
ABSTRACT:
The charge coupled device (23) provides serialized signals from a line of a document (11) to an A/D converter (28). In order to compensate for factors such as non-uniformity of lighting, non-uniformity of CCD cell response and variations with time, a reference strip (29) is read before each reading of a document and the corresponding digital values are stored in a RAM (31). Thereafter the stored values and the values read from each line of the document are compared to provide compensated values to a half tone generator (42) which codes the output. In particular, the comparison is effected by means of an EPROM (32) addressed in part by the digital value derived from a pixel in the line of the document and in part by the digital value stored in the RAM (31) from the corresponding pixel in the reference strip. The values held in the EPROM (32) correspond to the ratios between the addressing values. The EPROM (32) includes a plurality of sections, one for each of a plurality of different colors selected by a multiplexer ( 41) in correspondence with the selection of a filter (24) determining the scanning color. The reference strip is scanned through each filter before the document is scanned to determine the values in the RAM (31).
REFERENCES:
patent: 3800078 (1974-03-01), Cochran et al.
patent: 4520395 (1985-05-01), Abe
patent: 4554583 (1985-11-01), Saitoh et al.
patent: 4647961 (1987-03-01), Kammoto et al.
patent: 4679073 (1987-07-01), Hayashi
patent: 4727434 (1988-02-01), Kawamura
patent: 4731661 (1988-03-01), Nagano
Patent Abstracts of Japan, vol. 5, No. 113 (E-66) [785], Jul. 22, 1981, For Kokai 56-50668, Sasaki et al.
William H. Bruce, Jr., et al. "Calibration Mechanism for a CVT Image Input Module", Xerox Disclosure Journal, vol. 8, No. 3, May/Jun. 1983, pp. 273-274.
Mitsuo Togashi et al., "Facsimile Shading Corrector", 1984 IEEE International Solid-State Circuits Conference Digest of Technical Papers, pp. 204-205.
Patent Abstracts of Japan, vol. 9, No. 4 (E-288) [1727], Jan. 10, 1985, For Kokai 59-153377, Nagashima.
Augusti Ferdinando
Bonatto Luigi
Puglisi Anna M.
Groody James J.
Ing. C. Olivetti & C. S.p.A.
Svihla Randall S.
LandOfFree
Color image reacting apparatus having a non-uniformity correctio does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Color image reacting apparatus having a non-uniformity correctio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color image reacting apparatus having a non-uniformity correctio will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1734192