发明名称 |
Method of and apparatus for eliminating interblock distortion due to compressed image data. |
摘要 |
Interblock distortion often appears on a boundary of pixel blocks in a reproduced image produced from compressed image data. The interblock distortion is eliminated by correcting a density distribution in the reproduced image. First, an average density (Aij of a selected pixel block (Bij) is computed. Second, a standard deviation ( sigma ij) of a density distribution in the selected deviation is computed. If the standard deviation is equal to zero, correction value distributions DELTA fm, DELTA fn) along a main scanning direction and a subscanning direction are obtained. Finally, corrected density distribution (fmn) is obtained as a sum of the average density and the correction value distributions. |
申请公布号 |
EP0336365(B1) |
申请公布日期 |
1995.07.19 |
申请号 |
EP19890105877 |
申请日期 |
1989.04.04 |
申请人 |
DAINIPPON SCREEN MFG. CO., LTD. |
发明人 |
ARAGAKI, MASAMI DAINIPPON SCREEN MFG.CO.LTD. |
分类号 |
G03F3/08;G06T5/00;G06T9/00;H04N1/41;H04N1/415 |
主分类号 |
G03F3/08 |
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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