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A cyclic projected gradient method

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Abstract

In recent years, convex optimization methods were successfully applied for various image processing tasks and a large number of first-order methods were designed to minimize the corresponding functionals. Interestingly, it was shown recently in Grewenig et al. (2010) that the simple idea of so-called “superstep cycles” leads to very efficient schemes for time-dependent (parabolic) image enhancement problems as well as for steady state (elliptic) image compression tasks. The “superstep cycles” approach is similar to the nonstationary (cyclic) Richardson method which has been around for over sixty years.

In this paper, we investigate the incorporation of superstep cycles into the projected gradient method. We show for two problems in compressive sensing and image processing, namely the LASSO approach and the Rudin-Osher-Fatemi model that the resulting simple cyclic projected gradient algorithm can numerically compare with various state-of-the-art first-order algorithms. However, due to the nonlinear projection within the algorithm convergence proofs even under restrictive assumptions on the linear operators appear to be hard. We demonstrate the difficulties by studying the simplest case of a two-cycle algorithm in ℝ2 with projections onto the Euclidean ball.

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Authors and Affiliations

  1. Dept. of Mathematics and Computer Science, Saarland University, Campus E1.7, 66041, Saarbrücken, Germany

    Simon Setzer

  2. Dept. of Mathematics, Felix-Klein-Center, University of Kaiserslautern, 67653, Kaiserslautern, Germany

    Gabriele Steidl & Jan Morgenthaler

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  1. Simon Setzer
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  2. Gabriele Steidl
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  3. Jan Morgenthaler
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Correspondence to Simon Setzer.

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Setzer, S., Steidl, G. & Morgenthaler, J. A cyclic projected gradient method. Comput Optim Appl 54, 417–440 (2013). https://doi.org/10.1007/s10589-012-9525-4

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