Method and apparatus for automatic gain and exposure control...

Details Method and apparatus for automatic gain and exposure control... Method and apparatus for automatic gain and exposure control...

2007-07-17

2007-07-17

Vu, Ngoc-Yen (Department: 2622)

Television

Camera, system and detail

Combined image signal generator and general image signal...

C348S362000, C348S364000

Reexamination Certificate

active

10160089

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

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