发明名称 |
A PREDICTIVE PICTURE ENCODING CIRCUIT WHICH SELECTIVELY SUPPRESSES AND REPLACES PREDICTION ERROR VALVES, AND A CORRESPONDING PREDICTIVE DECODING CIRCUIT |
摘要 |
In a predictive encoding circuit the transmission of prediction errors to the predictive decoding circuit is selectively suppressed and prediction errors having a predetermined value are applied to the prediction circuit in both the encoding circuit and in the decoding circuit, instead of the non-transmitted prediction errors. In order to determine which prediction errors are not transmitted, a masking function value is determined for an actual pixel in the encoding circuit. This is a linear combination of weighted differences between two pixel values of a predetermined cluster of pixels located in the vicinity of the actual pixel. The actual prediction error is not transmitted only if, for example this masking function value is within a certain range and the previous prediction error has been transmitted. In the decoding circuit the masking function values are determined, starting from the regained local pixel values. |
申请公布号 |
AU626232(B2) |
申请公布日期 |
1992.07.23 |
申请号 |
AU19890046952 |
申请日期 |
1989.12.19 |
申请人 |
N.V. PHILIPS GLOEILAMPENFABRIEKEN |
发明人 |
GAETANO CARONNA |
分类号 |
G06T9/00;H04N7/32;(IPC1-7):H04N7/137 |
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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