Method and apparatus for automatic gain and exposure control for maintaining target image brightness in video imager systems

摘要: In an image processing system, the imager gain and exposure time are adjusted based on a predefined stepping sequence using table designed to maximize signal-to-noise ratio in image. This is achieved by providing with each step having largest suitable integration (exposure) appropriate amplifier digital setting, while achieving equal relative percentage change brightness between adjacent steps. The size of executed AE steps proportional distance current luminance target luminance. capability skip one or more sequence, if appropriate, for relevant step, number skipped steps, any, being magnitude deviation from brightness.