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A new majorization–minimization framework for $$\ell _p$$ ℓ p – $$\ell _q$$ ℓ q image restoration is presented. The solution is sought in a generalized Krylov subspace that is build up during the solution process. Proof of convergence to a stationary point of the minimized $$\ell _p$$ ℓ p – $$\ell _q$$ ℓ q functional is provided for both convex and nonconvex...
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