Artifact-Free Resolution Enhancement Using a Shearlet Sparsity Prior

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abstract acquisitions affected altering apparent artifact artifacts assuming assumption assumptions attention augmented bank basis bilinear blurriness choice choices choosing chosen clearly comes compact compressed computationally consider convergence correctly cost depend design drawback easily either eliminates employed enhancement enlarged evaluated even experiment fast filter filters focuses frame free frequencies fully functions give gives good guess handle implementation implemented implicitly impulse infinite initial interpolation introduces iterations iterative journal little longer manifests matrix missing mitigate mitigated modalities modify noise observations occurs operator optimal optimally optimization option pass performance phantom placed posed prior problem problems property propose proposed pseudo radial reconstructed reconstructing reconstruction reducing redundancy regularized repeating required resolution response ringing rise sampled sampling scale scanner scenario sensing simple smooth soft software solve space sparse sparsity spatially speed spirally stands step steps support synthesis table tailored threshold thresholding tight transform transformation transient trio trivial true typical uniformly unit variety viewing wavelet wavelets wide zoom zooming