Backlight correction system

Details Backlight correction system Backlight correction system

1990-11-13

1991-12-24

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821319, H04N 526

Patent

active

050757784

ABSTRACT:
A television camera with automatic lens opening control provides pictures from backlighted scenes which neither overly darken the subject nor overly brighten the background. The lens opening is controlled by the average value of the incident light intensity, but not before the incident light intensity is subjected to a white compression process. The signal corresponding to the incident light is processed by a white compression circuit to compress the brighter portions of the signal. The compressed output is averaged and used to control the lens opening.

REFERENCES:
patent: 3555181 (1971-01-01), Thommen
patent: 4365272 (1982-12-01), Nagai
patent: 4396957 (1983-08-01), Tanaka
patent: 4821100 (1989-04-01), Yamamoto

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