title: Cosine transform based preconditioners for total variation deblurring.
abstract: In PDE image restoration problems, one has to invert operators which is a sum of a blurring operator and an elliptic operator with highly varying coefficient. We present a preconditioner for such operators, which can be used with the conjugate gradient (CG) method, and compare it with Vogel and Oman's product preconditioner.
authors.forename: R H
authors.initials: RH
authors.lastname: Chan
authors.forename: T F
authors.initials: TF
authors.lastname: Chan
authors.forename: C K
authors.initials: CK
authors.lastname: Wong