Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-12-28
1990-06-26
Coles, Sr., Edward L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358447, H04N 140
Patent
active
049376829
ABSTRACT:
A document scanner generates an 8-bit binary word for each picture element (PEL) of a document. One of a group of 256 different binary words is thereby generated in accordance with the image/background content of each document PEL. These scan words vary in magnitude from hexadecimal "00" to "FF", representing a PEL containing only white background, or representing a PEL containing only the most dense black portion of the document's image, respectively. An intensity and/or contrast look-up table memory element, or a computation means, each having 256 addressable locations or inputs, is addressed using the scan words. Each storage location or input is addressed by one of the 256 possible document PEL words. The stored content of each storage location in the look-up table memory element, or the value that is computed by the computation means, comprises an enhanced 8-bit binary word that varies as a function of user selected image intensity and/or contrast enhancement. In this way, each document PEL scan word produces its intensity and/or contrast enhanced equivalent PEL word.
REFERENCES:
patent: 4129853 (1978-12-01), Althauser et al.
patent: 4339774 (1982-07-01), Temple
patent: 4636845 (1987-01-01), Alkofer
patent: 4689691 (1987-08-01), Isogai et al.
patent: 4695884 (1987-09-01), Anastassiou et al.
patent: 4807045 (1989-02-01), Shimano
IBM Journal of Research and Development, Jan. 1987, pp. 2-15, "Digital halftoning on the IBM 4250 Printer", by Goertzel and G. Thompson.
Coles Sr. Edward L.
Hewlett--Packard Company
LandOfFree
Method and apparatus for providing contrast/intensity control in does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for providing contrast/intensity control in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for providing contrast/intensity control in will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1129352