TY - JOUR T1 - Wavelet Based Restoration of Images with Missing or Damaged Pixels JO - East Asian Journal on Applied Mathematics VL - 2 SP - 108 EP - 131 PY - 2018 DA - 2018/02 SN - 1 DO - http://doi.org/10.4208/eajam.020310.240610a UR - https://global-sci.org/intro/article_detail/eajam/10923.html KW - Image restoration, impulsive noise, tight frame, sparse approximation, split Bregman method. AB -

This paper addresses the problem of how to restore degraded images where the pixels have been partly lost during transmission or damaged by impulsive noise. A wide range of image restoration tasks is covered in the mathematical model considered in this paper – e.g. image deblurring, image inpainting and super-resolution imaging. Based on the assumption that natural images are likely to have a sparse representation in a wavelet tight frame domain, we propose a regularization-based approach to recover degraded images, by enforcing the analysis-based sparsity prior of images in a tight frame domain. The resulting minimization problem can be solved efficiently by the split Bregman method. Numerical experiments on various image restoration tasks – simultaneously image deblurring and inpainting, super-resolution imaging and image deblurring under impulsive noise – demonstrated the effectiveness of our proposed algorithm. It proved robust to mis-detection errors of missing or damaged pixels, and compared favorably to existing algorithms.