An enhanced high-order variational model based on speckle noise removal with Gdistribution

Research output: Contribution to journalArticle

Authors

  • Yunping Mu
  • Baoxiang Huang
  • Zhenkuan Pan
  • Huan Yang
  • Guojia Hou

Colleges, School and Institutes

Abstract

Speckle noise removal problem has been researched under the framework of regularization-based approaches. The regularizer is normally defined as total variation (TV) that induces staircase effect. Although higher-order regularizer can conquer the staircase effect to some extent, it often leads to blurred. Considering the upper questions, the combination of first and second-order regularizer will be an effective and prior method to tackle speckle noise removal. So a variational model with hybrid TV and higher-order total curvature (TC) term is proposed in this paper, the data fidelity term is derived based on G0 distribution. In order to preserve the edge detail better, the boundary detection function is combined with the regularizer. Furthermore, the Mellin transform is used to estimate the parameters of the model. To address the speckle noise removal optimization problem, alternating direction method of multipliers (ADMM) framework is employed to design a convex numerical method for the proposed model. The numerical method can be used to update the variables flexibly as required by the hybrid regularizer. The numerous experiments were performed on both synthetic and real SAR images. Compared with some classical and state-of-theart SAR despeckling methods, experiment results demonstrate the improved performance of the proposed method, including that speckle noise can be removed effectively, and staircase effect can be prevented while preserving image feature.

Details

Original languageEnglish
Pages (from-to)104365-104379
Number of pages15
JournalIEEE Access
Volume7
Early online date29 Jul 2019
Publication statusPublished - 13 Aug 2019

Keywords

  • Speckle noise, synthetic aperture radar (SAR), G 0 distribution, total variation(TV), total curvature(TC), boundary detection function, alternating direction method of multipliers (ADMM), Mellin transform