DC level control circuitry for CCD images

Details DC level control circuitry for CCD images DC level control circuitry for CCD images

1992-08-17

1994-07-12

Powell, Mark R.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348257, H04N 518

Patent

active

053293126

ABSTRACT:
There are disclosed electronic imaging systems employing CCD imaging units and one or more unique analog signal processors (ASP's). Each ASP receives color-component image signals from the CCD unit and provides respective output image signals, such as red, green and blue color components, having proper white balance for combining into a full color image. The dark background or zero level of the output image signals is referenced to a common "dark" reference voltage to minimize dark background variations in the combined color image regardless of the gain setting of the ASP or ASP's. Each ASP is substantially identical and has a unique architecture which facilitates its implementation as an integrated circuit. The ASP has a dynamic range of substantially better than 8-bits and provides for a wide range of signal sample rates (e.g., 1 to 40 MHz).

REFERENCES:
patent: 3818127 (1974-06-01), Walter
patent: 4549215 (1985-10-01), Levine
patent: 4886986 (1989-12-01), Watanabe
patent: 4980768 (1990-12-01), Stehle et al.
patent: 4987321 (1991-01-01), Toohey
patent: 5010408 (1991-04-01), Toohey
M. H. White et al., entitled "Characterization of Surface Channel CCD Image Arrays at Low Light Levels," IEEE Journal of Solid-State Circuits, vol. SC-9, No. 1, Feb. 1974, pp. 1-13.

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