发明授权
US07453938B2 Target bitrate estimator, picture activity and buffer management in rate control for video coder
失效
视频编码器速率控制中的目标比特率估计器,图像活动和缓冲器管理
- 专利标题: Target bitrate estimator, picture activity and buffer management in rate control for video coder
- 专利标题(中): 视频编码器速率控制中的目标比特率估计器,图像活动和缓冲器管理
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申请号: US10812062申请日: 2004-03-30
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公开(公告)号: US07453938B2公开(公告)日: 2008-11-18
- 发明人: Barin Geoffry Haskell , Adriana Dumitras , James Normile , Hsi-Jung Wu , Xiaochun Nie , Atul Puri
- 申请人: Barin Geoffry Haskell , Adriana Dumitras , James Normile , Hsi-Jung Wu , Xiaochun Nie , 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: Kenyon & Kenyon LLP
- 主分类号: H04B1/66
- IPC分类号: H04B1/66 ; H04N11/02
摘要:
A rate control system is disclosed for video coding applications. The rate controller assigns a quantization parameter for video data in a picture in response to complexity indicators indicative of spatial complexity, motion complexity and/or bits per pel of the picture. A virtual buffer based quantizer parameter is proposed based on a virtual buffer fullness analysis and a target rate estimate, which is derived from the complexity indicators. A second quantizer parameter is proposed from a linear regression analysis of quantizer parameters used to code previously coded pictures of similar type (e.g., I pictures, P pictures or B pictures). A coding policy decision unit defines a final quantizer parameter from a comparison of the two proposed quantizer parameters.