Scene-aware automatic-exposure control

Details Scene-aware automatic-exposure control Scene-aware automatic-exposure control

2010-06-04

2011-12-13

Henn, Timothy J (Department: 2622)

Television

Camera, system and detail

Optics

Reexamination Certificate

active

08077256

ABSTRACT:
A scene-aware auto-exposure control process stabilizes changes in a camera's auto-exposure settings so as to reduce lighting and color flicker during image capture operations. A metric, referred to as the Modified Adjusted Luminance (MAL) metric, is defined to remain relatively constant as long as the lighting of the scene being captured remains relatively constant. Thus, scene changes such as an object moving into, out of, or around in a scene do not significantly affect the MAL metric's value and do not, therefore, trigger an exposure adjustment. Once the MAL metric indicates a scene's lighting is stable, the camera's auto-exposure operation may be suppressed. As long as incoming frames indicate a stable lighting condition (based on the MAL metric), auto-exposure operation may remain suppressed. When incoming frames result in a substantially different MAL over a specified number of frames, auto-exposure operation may be restored.

REFERENCES:
patent: 5793422 (1998-08-01), Mochizuki et al.
patent: 7075577 (2006-07-01), Tang

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