发明名称 |
Method of monitoring the quality of distributed digital images by detecting false contours |
摘要 |
A method and device for monitoring the quality of distributed digital images coded by blocks of pixels in which a false contour phenomenon may be generated when the image is reproduced. An image average for pixels represented by at least one luminance respectively chrominance components is calculated and a false contour effect on the basis of a criterion for discriminating the luminance or chrominance component difference between adjacent pixels of adjacent groups of pixels is detected in at least one reference direction of each current image. A visibility coefficient of at least one current image is calculated from the value of the image average speed vector and psycho-visual criteria relating to the existence of the false contour effect in the reference direction.
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申请公布号 |
US6707943(B2) |
申请公布日期 |
2004.03.16 |
申请号 |
US20010777028 |
申请日期 |
2001.02.05 |
申请人 |
FRANCE TELECOM;TELEDIFFUSION DE FRANCE |
发明人 |
GICQUEL JEAN-CHARLES;PEFFERKOHN STEPHANE;WYCKENS EMMANUEL;BLIN JEAN-LOUIS |
分类号 |
G06T7/00;(IPC1-7):G06K9/48 |
主分类号 |
G06T7/00 |
代理机构 |
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