发明名称 |
VIDEO DECODER APPARATUS USING NON-REFERENCE FRAME AS AN ADDITIONAL PREDICTION SOURCE AND METHOD THEREFOR |
摘要 |
<p>An video decoder system, such as for use with MPEG video compression, uses a previous B-frame as an additional prediction source for the current B-frame, along with the past and future reference frames as defined by the MPEG specification. In one embodiment a given macroblock within a current B-frame "N" reuses pixel values from the previous B-frame "N-1" if they are "similar enough" to the anticipated pixels which would otherwise need to be computed. For a given macroblock, motion vectors for both B-frames are compared: if they differ by less than a similarity threshold value, then the pixel values from the previous B-frame are reused without further computation. The similarity threshold may be adaptively adjusted to reduce the computational burden of video decompression, while affording a gradual degradation of picture quality, rather than wholesale skipping of entire frames.</p> |
申请公布号 |
EP0821857(B1) |
申请公布日期 |
1999.09.01 |
申请号 |
EP19960912840 |
申请日期 |
1996.04.17 |
申请人 |
ADVANCED MICRO DEVICES, INC. |
发明人 |
TUCKER, MICHAEL, R.;STRONGIN, GEOFFREY, S.;YI, LIU |
分类号 |
G06T9/00;H04N7/46;(IPC1-7):H04N7/46 |
主分类号 |
G06T9/00 |
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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