发明名称 |
Target bitrate estimator, picture activity and buffer management in rate control for video coder |
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.
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申请公布号 |
US7453938(B2) |
申请公布日期 |
2008.11.18 |
申请号 |
US20040812062 |
申请日期 |
2004.03.30 |
申请人 |
APPLE INC. |
发明人 |
HASKELL BARIN GEOFFRY;DUMITRAS ADRIANA;NORMILE JAMES;WU HSI-JUNG;NIE XIAOCHUN;PURI ATUL |
分类号 |
H04B1/66;H04N7/12;H04N11/02 |
主分类号 |
H04B1/66 |
代理机构 |
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主权项 |
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地址 |
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