Correcting an optical black level by feeding forward a calculate

Details Correcting an optical black level by feeding forward a calculate Correcting an optical black level by feeding forward a calculate

1996-03-22

1999-12-21

Ho, Tuan

Television

Camera, system and detail

Combined image signal generator and general image signal...

348222, 348250, H04N 5228, H04N 964

Patent

active

060056150

ABSTRACT:
An image processing apparatus constructed in a manner such that an image signal is inputted, the inputted image signal is clamped to a predetermined reference voltage in a clamp circuit, an optical black level of the clamped image signal is detected by a detection circuit, the detected optical black level and a predetermined black level are compared and a correction amount is calculated in an operation circuit, and the optical black level is corrected by operating the correction amount obtained by the operation circuit for the clamped image signal in a correction circuit.

REFERENCES:
patent: 3737571 (1973-06-01), Gaebele et al.
patent: 4559559 (1985-12-01), Hashimoto et al.
patent: 4972266 (1990-11-01), Tani
patent: 5278658 (1994-01-01), Takase
patent: 5512947 (1996-04-01), Sawachi et al.

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