Invention Grant
- Patent Title: Scene adaptive temporal filtering
- Patent Title (中): 场景自适应时间滤波
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Application No.: US13619592Application Date: 2012-09-14
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Publication No.: US09215355B2Publication Date: 2015-12-15
- Inventor: Ting Chen , Yongfang Liang , Anita Nariani Schulze
- Applicant: Ting Chen , Yongfang Liang , Anita Nariani Schulze
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Kenyon & Kenyon LLP
- Main IPC: H04N5/217
- IPC: H04N5/217 ; H04N5/14 ; H04N5/213 ; G06T5/00 ; H04N5/357

Abstract:
Calculating a temporal filter values to filter video data for noise and ghosting artifacts. A sensor specific noise model may be derived using the video capture settings of the video source to estimate the noise variance for an image, and to determine the amount of the temporal filtering to be applied to a frame or pixel. The global motion and sensor specific noise model may be used to populate filter coefficient look-up tables based on the local motion and luma values of each pixel in the frame. The maximum absolute difference between frames may be used to estimate global motion between two frames such that filter strength may be reduced for frames exhibiting high global motion and increased for frames exhibiting low global motion. According to an embodiment, the increase in temporal filtering between frames may be capped to avoid sudden visible noise differences between frames.
Public/Granted literature
- US20130083246A1 SCENE ADAPTIVE TEMPORAL FILTERING Public/Granted day:2013-04-04
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