发明授权
- 专利标题: Switching distortion metrics during motion estimation
- 专利标题(中): 运动估计过程中的切换失真度量
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申请号: US11400049申请日: 2006-04-07
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公开(公告)号: US08155195B2公开(公告)日: 2012-04-10
- 发明人: Shankar Regunathan , Chih-Lung Lin , Thomas W. Holcomb
- 申请人: Shankar Regunathan , Chih-Lung Lin , Thomas W. Holcomb
- 申请人地址: US WA Redmond
- 专利权人: Microsoft Corporation
- 当前专利权人: Microsoft Corporation
- 当前专利权人地址: US WA Redmond
- 代理机构: Klarquist Sparkman, LLP
- 主分类号: H04B1/66
- IPC分类号: H04B1/66 ; H04N7/12 ; H04N11/02 ; H04N11/04
摘要:
Techniques and tools for switching distortion metrics during motion estimation are described. For example, a video encoder determines a distortion metric selection criterion for motion estimation. The criterion can be based on initial results of the motion estimation. To evaluate the criterion, the encoder can compare the criterion to a threshold that depends on a current quantization parameter. The encoder selects between multiple available distortion metrics, which can include a sample-domain distortion metric (e.g., SAD) and a transform-domain distortion metric (e.g., SAHD). The encoder uses the selected distortion metric in the motion estimation. Selectively switching between SAD and SAHD provides rate-distortion performance superior to using only SAD or only SAHD. Moreover, due to the lower complexity of SAD, the computational complexity of motion estimation with SAD-SAHD switching is typically less than motion estimation that always uses SAHD.
公开/授权文献
- US20070237226A1 Switching distortion metrics during motion estimation 公开/授权日:2007-10-11