Image signal processing circuit in a digital camera having gain

Details Image signal processing circuit in a digital camera having gain Image signal processing circuit in a digital camera having gain

1995-06-27

1996-12-17

Peng, John K.

Television

Camera, system and detail

Combined image signal generator and general image signal...

348255, 348674, H04N 5202

Patent

active

055858465

ABSTRACT:
A digital camera for processing a digital signal. The camera includes an image signal processing circuit which uses a low-resolution analog-to-digital converter. The processing circuit performs AGC and gamma control on both digital and analog signals. Gain control and gamma control are performed by auto gain controllers which either process an analog signal prior to converting the analog signal to a digital signal or after the analog signal is converted to a digital signal. The image signal processing circuit performs processing based on the output of one of a m-bit output of an AGC/gamma controller and a m-bit output of an A/D converter. The AGC/gamma controller receives an n-bit clamped image signal from a clamper, while the m-bit A/D converter receives an analog input. This selection operation minimizes the need for a high-resolution A/D converter.

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