Invention Grant
- Patent Title: Scene-aware automatic-exposure control
- Patent Title (中): 场景感知自动曝光控制
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Application No.: US13292353Application Date: 2011-11-09
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Publication No.: US08493501B2Publication Date: 2013-07-23
- Inventor: Douglas Price , Xiaosong Zhou , Hsi-Jung Wu , James Oliver Normile
- Applicant: Douglas Price , Xiaosong Zhou , Hsi-Jung Wu , James Oliver Normile
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Wong, Cabello, Lutsch, Rutherford & Brucculeri, LLP
- Main IPC: H04N5/238
- IPC: H04N5/238

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.
Public/Granted literature
- US20120057073A1 Scene-Aware Automatic-Exposure Control Public/Granted day:2012-03-08
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