发明名称 |
Method for preventing dual-step half-pixel motion compensation accumulation errors in prediction-rich MPEG-2 sequences |
摘要 |
A two-step motion prediction for MPEG-2 interpolation case-D will yield visual artifacts if not corrected. An improved MPEG-2 decoder includes a logic gate, multiplexer, and adder. When both the horizontal (h0) and vertical (h1) motion vector components require a half pixel interpolation (case-D), the multiplexer forwards the constant minus three to the adder, otherwise a constant zero is used. Such adder modifies the DC coefficient input to the inverse discrete cosine transformer to include a correction term for the predicted pixels calculated by a two-step predictor. A correction value of -0.375 is evenly distributed over all sixty-four resulting spatial coefficients during the inverse discrete cosine transform. This results statistically in a slightly brighter set of correction terms. Such offsets result in a slightly darker prediction that is formed by the two-step predictor. The output frames are statistically correct images. <IMAGE> |
申请公布号 |
GB2363279(B) |
申请公布日期 |
2003.10.22 |
申请号 |
GB20010023396 |
申请日期 |
2000.03.31 |
申请人 |
* RAVISENT TECHNOLOGIES INC;* RAVISENT TECHNOLOGIES INC;* STMICROELECTRONICS INC. |
发明人 |
ROBERT M * WOLFF;RANDY * LANGER;ULRICH * SIGMUND |
分类号 |
G06F9/46;H04N7/26;H04N7/32;H04N7/36;H04N7/50;(IPC1-7):H04N7/62 |
主分类号 |
G06F9/46 |
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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