发明名称 |
Method and apparatus for MPEG-4 FGS performance enhancement |
摘要 |
An architecture of a fine granularity scalable (FGS) codec has an encoder and a decoder configurable in three prediction modes. The coarse prediction loop in the base layer of the encoder has a switch for selecting either coarse prediction output or fine prediction output in the encoder. The fine prediction loop in the enhancement layer of the encoder also has a switch for selecting either coarse prediction output or fine prediction output. Two-pass encoding is used in the encoder. The first pass extracts coding parameters and classifies macroblocks of a video frame into three groups each being assigned with all-coarse prediction mode, all-fine prediction mode or mix prediction. The second pass uses the assigned modes to encode the macroblocks. A rate adaptation algorithm is provided to truncate the enhancement bit-planes for low bit rate, medium bit rate and high bit rate and allocate bit efficiently for achieving higher video quality.
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申请公布号 |
US7227894(B2) |
申请公布日期 |
2007.06.05 |
申请号 |
US20040786971 |
申请日期 |
2004.02.24 |
申请人 |
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE |
发明人 |
LIN CHIA-WEN;CHEN SU-REN |
分类号 |
H04N7/18;H04N7/12;H04N7/26;H04N7/50 |
主分类号 |
H04N7/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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