Picture image processor

Details Picture image processor Picture image processor

1986-04-09

1988-02-02

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358284, H04N 140

Patent

active

047231742

ABSTRACT:
A picture image processor wherein a white reference value with respect to an analog output of video data is established in response to a change in luminous energy, and the white reference output is compared with the video data output to obtain a binary signal, and this signal is stored in a memory system; then, the stored signal is subjected to a digital-to-analog conversion to form a reference signal, which is inputted to an A/D converter in synchronism with the respective picture elements of an original reading signal, and/or a dark or bright voltage value of the image sensor which has been previously stored is corrected on the basis of such gain from an amplifying means which changes automatically, and the output of the above image sensor is corrected based on the voltage value thus corrected.

REFERENCES:
patent: 4491963 (1985-01-01), Bellemare
patent: 4539600 (1985-09-01), Takahashi et al.
patent: 4623934 (1986-11-01), Taylor
G. J. Dohamich et al., "Gain Compensation System for Image Scanners" IBM Technical Discl. Bul., vol. 21, No. 1, 6/78.
D. G. Smith, Jr. "Reflective Document Detector" IBM Tech. Discl. Bulletin, vol. 23, No. 1., 6/80.

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