Automatic contrast correctin useful in video-to-print apparatus

Details Automatic contrast correctin useful in video-to-print apparatus Automatic contrast correctin useful in video-to-print apparatus

1993-02-26

1994-03-01

Powell, Mark R.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358538, 358523, 348678, H04N 146

Patent

active

052913139

ABSTRACT:
Disclosed is an automatic contrast correction method and apparatus for optimizing contrast of a picture screen. There is included an effective picture screen extractor for extracting video data corresponding to the effective picture screen among video data in the picture screen, a plurality of amplifiers for receiving the video data and amplifying the received video data for output, and a microcomputer for comparing the average value which is calculated from the video data of the effective picture screen with a previously set reference value and regulating an amplification factor by supplying a control signal to the amplifiers according to the comparison result. Even if video images photographed toward the sun are printed, it can be prevented from being printed in a dark state, thereby obtaining a good quality of picture.

REFERENCES:
patent: 4887150 (1989-12-01), Chiba et al.
patent: 5119187 (1992-06-01), Ikeda et al.

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