| 摘要 |
Systems and methods of reducing artifices in compressed images (12) are described. In one aspect, spatially-shifted forward transforms or the input image (12) are computed to generate respective sets of forward transform coefficients (C1, C2, ..., CK). Nonlinear transforms (T1, T2, ...,TK) are applied to the forward transform coefficients of each set (C1, C2, ..., CK). Inverse transforms (C'1, C'2 ..., C'K)of the sets of nonlinearly transformed forward transform coefficients are computed to generate respective intermediate images (I1, I2, ..., IK). Respective measures of local spatial intensity variability are computed for pixels of each of the intermediate images (I1, I2, ..., IK). An output image (40) is computed with pixel values computed based at least in part of the competed measures of the local spatial intensity variability. |
