发明授权
US07822118B2 Method and apparatus for control of rate-distortion tradeoff by mode selection in video encoders
有权
用于通过视频编码器中的模式选择来控制速率失真折衷的方法和装置
- 专利标题： Method and apparatus for control of rate-distortion tradeoff by mode selection in video encoders
- 专利标题（中）： 用于通过视频编码器中的模式选择来控制速率失真折衷的方法和装置
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申请号： US11344591申请日： 2006-01-30
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公开(公告)号： US07822118B2公开(公告)日： 2010-10-26
- 发明人: Barin Geoffry Haskell , Adriana Dumitras , Atul Puri
- 申请人： Barin Geoffry Haskell , Adriana Dumitras , Atul Puri
- 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： Adeli & Tollen LLP
- 主分类号： H04B1/66
- IPC分类号： H04B1/66
摘要：
A Method And Apparatus For Control of Rate-Distortion Tradeoff by Mode Selection in Video Encoders is Disclosed. The system of the present invention first selects a distortion value D near a desired distortion value. Next, the system determines a quantizer value Q using the selected distortion value D. The system then calculates a Lagrange multiplier lambda using the quantizer value Q. Using the selected Lagrange multiplier lambda and quantizer value Q, the system begins encoding pixelblocks. If the system detects a potential buffer overflow, then the system will increase the Lagrange multiplier lambda. If the Lagrange multiplier lambda exceeds a maximum lambda threshold then the system will increase the quantizer value Q. If the system detects a potential buffer underflow, then the system will decrease the Lagrange multiplier lambda. If the Lagrange multiplier lambda falls below a minimum lambda threshold then the system will decrease the quantizer value Q.