Sonar target enhancement by shrinkage of incoherent wavelet coefficients
article
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. © 2014 Acoustical Society of America.
Topics
TNO Identifier
489129
Source
Journal of the Acoustical Society of America, 135(January), pp. 262-268.
Pages
262-268
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