An auto gain control (AGC) is an essential module for real-time camera systems, such as digital still camera, video hand recorder, etc. This paper presents an efficient technique for auto gain control with digital signal processing. We first develop an efficient algorithm to estimate the gain of the sampling image. The adaptive AGC method adopts a linear piecewise approach for low-cost and high-speed implementations. To meet real-time applications, we also present a cost-effective architecture for realizing the module of auto gain control, and the circuit can process the gain of each pixel per cycle. Compared to the conventional AGC method, the complexity of full camera system can be efficiently reduced.

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