Sonar target enhancement by shrinkage of incoherent wavelet coefficients

Alan J Hunter, Robbert van Vossen

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
160 Downloads (Pure)

Abstract

Background reverberation can obscure useful features of the target echo response in broadband low-frequency sonar images, adversely affecting detection and classification performance. This paper describes a resolution and phase-preserving means of separating the target response from the background reverberation noise using a coherence-based wavelet shrinkage method proposed recently for de-noising magnetic resonance images. The algorithm weights the image wavelet coefficients in proportion to their coherence between different looks under the assumption that the target response is more coherent than the background. The algorithm is demonstrated successfully on experimental synthetic aperture sonar data from a broadband low-frequency sonar developed for buried object detection.

Original languageEnglish
Pages (from-to)262-268
JournalThe Journal of the Acoustical Society of America
Volume135
Issue number1
DOIs
Publication statusPublished - Jan 2014

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