Patent ID: 7388999

Claim:
A method of processing an input image compressed in accordance with a block discrete cosine transform (DCT) image compression process, comprising: computing spatially-shifted forward transforms of the input image, each of the forward transforms being computed based on a denoiser transform Z having an associated transpose Z′, wherein a matrix multiplication between Z and Z′ produces a diagonal matrix Λ, Z=F(D), F specifies a nonlinear mapping from coefficients of D to coefficients of Z, and D substantially corresponds to a frequency-domain transform; denoising the forward transforms based on nonlinear mappings derived from quantization values linked to the input image; computing spatially-shifted inverse transforms of the denoised forward transforms, each of the inverse transforms being computed based on Z and Z′; and computing an output image based on a combination of ones of the spatially-shifted inverse transforms.