The paper proves novel error bounds showing that a previously proposed closed-form TV proximal approximation can be made arbitrarily accurate by shrinking its scaling parameter.
A fast iterative shrinkage-thresholding algorithm for linear inverse problems,
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Closed-Form Approximation of the Total Variation Proximal Operator
The paper proves novel error bounds showing that a previously proposed closed-form TV proximal approximation can be made arbitrarily accurate by shrinking its scaling parameter.