发明名称 |
DEVICE AND PROCESS FOR ESTIMATING NOISE LEVEL, NOISE REDUCTION SYSTEM AND CODING SYSTEM COMPRISING SUCH A DEVICE |
摘要 |
The present invention relates to a device and a process for estimating the noise level of video images before coding. The device comprises in particular means of storage of at least one input image, a blockwise motion estimation module, designed to produce, blockwise, first quantities representative of motion-compensated image variations, on the basis of a current input image and of at least one input image stored previously in the said means of storage, means of estimation of a global noise level for each image as a function of at least certain of the said quantities representative of motion-compensated image variations, The said device comprises means of estimation of a local noise level for each block of the image as a function of second quantities representative of motion-compensated image variations and of the global noise level. |
申请公布号 |
EP1419658(A1) |
申请公布日期 |
2004.05.19 |
申请号 |
EP20020796209 |
申请日期 |
2002.08.06 |
申请人 |
NEXTREAM FRANCE |
发明人 |
LE MEUR, OLIVIER;BABONNEAU, JEAN-YVES;JOULAUD, GEORGES |
分类号 |
H04N5/21;H03M7/36;H04N7/26;H04N7/30;H04N7/50;(IPC1-7):H04N7/26 |
主分类号 |
H04N5/21 |
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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