Sonar target enhancement by shrinkage of incoherent wavelet coefficients

Sonar target enhancement by shrinkage of incoherent wavelet coefficients.

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-nois...

Wavelet shrinkage with correlated wavelet coefficients

This paper investigates the statistical characterization of multiscale wavelet coefficients corresponding to random signals and images. Virtually all approaches to wavelet shrinkage model the wavelet coefficients as independent; we challenge that assumption and demonstrate several cases where substantial correlations may be present in the wavelet domain. In particular, the correlation between s...

Incoherent Synthetic Aperture Sonar Processing

This chapter investigates the incoherent approach applied in synthetic aperture sonar processing. The details of implementation are shown, and the technical properties of this technique are presented. Simulations are presented along the way for purposes of illustrations and comparisons. Discussions of the potential and limitation of this approach are made. All the simulations and analytical inv...

A New Method for Speech Enhancement Based on Incoherent Model Learning in Wavelet Transform Domain

Quality of speech signal significantly reduces in the presence of environmental noise signals and leads to the imperfect performance of hearing aid devices, automatic speech recognition systems, and mobile phones. In this paper, the single channel speech enhancement of the corrupted signals by the additive noise signals is considered. A dictionary-based algorithm is proposed to train the speech...

Scattered data smoothing by empirical Bayesian shrinkage of second generation wavelet coefficients