
arXiv: 2407.13120
Recently, the degenerate preconditioned proximal point (PPP) method provides a unified and flexible framework for designing and analyzing operator-splitting algorithms such as Douglas-Rachford (DR). However, the degenerate PPP method exhibits weak convergence in the infinite-dimensional Hilbert space and lacks accelerated variants. To address these issues, we propose a Halpern-type PPP (HPPP) algorithm, which leverages the strong convergence and acceleration properties of Halpern's iteration method. Moreover, we propose a novel algorithm for image restoration by combining HPPP with denoiser priors such as Plug-and-Play (PnP) prior, which can be viewed as an accelerated PnP method. Finally, numerical experiments including several toy examples and image restoration validate the effectiveness of our proposed algorithms.
Halpern iteration, FOS: Computer and information sciences, Convex programming, preconditioned proximal point algorithms, regularization by denoising, Computer Vision and Pattern Recognition (cs.CV), Computing methodologies for image processing, plug-and-play prior, image restoration, Optimization and Control (math.OC), Optimization and Control, FOS: Mathematics, Contraction-type mappings, nonexpansive mappings, \(A\)-proper mappings, etc., Applications of operator theory in optimization, convex analysis, mathematical programming, economics, Computer Vision and Pattern Recognition, Image processing (compression, reconstruction, etc.) in information and communication theory, Monotone operators and generalizations
Halpern iteration, FOS: Computer and information sciences, Convex programming, preconditioned proximal point algorithms, regularization by denoising, Computer Vision and Pattern Recognition (cs.CV), Computing methodologies for image processing, plug-and-play prior, image restoration, Optimization and Control (math.OC), Optimization and Control, FOS: Mathematics, Contraction-type mappings, nonexpansive mappings, \(A\)-proper mappings, etc., Applications of operator theory in optimization, convex analysis, mathematical programming, economics, Computer Vision and Pattern Recognition, Image processing (compression, reconstruction, etc.) in information and communication theory, Monotone operators and generalizations
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