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    • 10. 发明申请
    • SPATIAL ACTIVITY METRIC AND METHOD FOR EVALUATING THE SAME
    • 空间活动度量及评估方法
    • WO2008042112A3
    • 2008-05-29
    • PCT/US2007020227
    • 2007-09-18
    • THOMSON LICENSINGLU XIAOANZHAI JIEFUGOMILA CRISTINA
    • LU XIAOANZHAI JIEFUGOMILA CRISTINA
    • G06T7/40
    • G06T7/41
    • A spatial activity metric for characterizing an image is established, typically based one of the image variance, image gradient or DCT coefficients. The spatial activity metric is then reduced by the amount of the estimated noise in the image so that upon the spatial activity metric in connection with spatial masking, the likelihood of unmasked distortion caused by the presence of noise, such as film grain will be reduced. The effectiveness of such a spatial activity metric can be determined by determining similarity of the measures made by the spatial activity metric for regions in the image of similar texture and by determining the difference in the measures made by the spatial activity metric for regions of different texture in the image.
    • 通常基于图像方差,图像梯度或DCT系数之一建立用于表征图像的空间活动度量。 然后,空间活动度量减少图像中的估计噪声的量,使得在与空间屏蔽相关的空间活动度量时,由于诸如胶片颗粒的噪声的存在而引起的未屏蔽失真的可能性将被降低。 这样的空间活动度量的有效性可以通过确定由相似纹理图像中的区域的空间活动度量所做出的度量的相似度,并且通过确定由不同纹理的区域的空间活动度量所做的度量的差异来确定 在图像中。