| 发明名称 |
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| 摘要 |
<p>PURPOSE:To reduce block distortion without deteriorating the resolution of an image. CONSTITUTION:A DC component separation circuit 3 obtains a DC component of picture elements in the unit of blocks and replaces all picture elements in the unit of blocks with the obtained DC component to obtain a DC component signal. A subtractor 5 subtracts the DC component signal from a decoded signal to provide an output of a high frequency component signal. A control circuit 2 uses information of a block size of conversion coding obtained from a decoder and a quantization characteristic of each block to adaptively select a band limit characteristic for the control. When the block size is large and the step size of step size quantization characteristics is rough and the high frequency component of a conversion signal is limited in the quantization characteristics, a band limit filter 4 selects space filter characteristics of a narrow frequency band to limit the band of the DC component signal. An adder 6 adds the DC component signal and the high frequency component signal subjected to band limits to obtain an image signal in which block distortion is reduced.</p> |
| 申请公布号 |
JP2879298(B2) |
申请公布日期 |
1999.04.05 |
| 申请号 |
JP19930284842 |
申请日期 |
1993.11.15 |
| 申请人 |
NIPPON DENKI ENJINIARINGU KK |
发明人 |
SUZUKI NORIO |
| 分类号 |
H04N19/117;H03H11/04;H04N1/41;H04N19/134;H04N19/136;H04N19/14;H04N19/176;H04N19/423;H04N19/44;H04N19/46;H04N19/48;H04N19/503;H04N19/59;H04N19/60;H04N19/61;H04N19/625;H04N19/70;H04N19/80;H04N19/86;(IPC1-7):H04N7/30 |
主分类号 |
H04N19/117 |
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