发明授权
- 专利标题: Scene-aware automatic-exposure control
- 专利标题(中): 场景感知自动曝光控制
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申请号: US12793848申请日: 2010-06-04
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公开(公告)号: US08077256B1公开(公告)日: 2011-12-13
- 发明人: Douglas Price , Xiaosong Zhou , Hsi-Jung Wu , James Oliver Normile
- 申请人: Douglas Price , Xiaosong Zhou , Hsi-Jung Wu , James Oliver Normile
- 申请人地址: US CA Cupertino
- 专利权人: Apple, Inc.
- 当前专利权人: Apple, Inc.
- 当前专利权人地址: US CA Cupertino
- 代理机构: Wong, Cabello, Lutsch, Rutherford & Brucculeri, L.L.P.
- 主分类号: H04N5/238
- IPC分类号: H04N5/238
摘要:
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.
公开/授权文献
- US20110298965A1 SCENE-AWARE AUTOMATIC-EXPOSURE CONTROL 公开/授权日:2011-12-08
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