We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Simultaneous Patch-Group Sparse Coding with Dual-Weighted ℓ p Minimization for Image Restoration.
- Authors
Zhang, Jiachao; Tong, Ying; Jiao, Liangbao
- Abstract
Sparse coding (SC) models have been proven as powerful tools applied in image restoration tasks, such as patch sparse coding (PSC) and group sparse coding (GSC). However, these two kinds of SC models have their respective drawbacks. PSC tends to generate visually annoying blocking artifacts, while GSC models usually produce over-smooth effects. Moreover, conventional ℓ 1 minimization-based convex regularization was usually employed as a standard scheme for estimating sparse signals, but it cannot achieve an accurate sparse solution under many realistic situations. In this paper, we propose a novel approach for image restoration via simultaneous patch-group sparse coding (SPG-SC) with dual-weighted ℓ p minimization. Specifically, in contrast to existing SC-based methods, the proposed SPG-SC conducts the local sparsity and nonlocal sparse representation simultaneously. A dual-weighted ℓ p minimization-based non-convex regularization is proposed to improve the sparse representation capability of the proposed SPG-SC. To make the optimization tractable, a non-convex generalized iteration shrinkage algorithm based on the alternating direction method of multipliers (ADMM) framework is developed to solve the proposed SPG-SC model. Extensive experimental results on two image restoration tasks, including image inpainting and image deblurring, demonstrate that the proposed SPG-SC outperforms many state-of-the-art algorithms in terms of both objective and perceptual quality.
- Subjects
IMAGE reconstruction; ALGORITHMS; INPAINTING; IMAGE quality analysis
- Publication
Micromachines, 2021, Vol 12, Issue 10, p1205
- ISSN
2072-666X
- Publication type
Article
- DOI
10.3390/mi12101205