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Application of Splines and Wavelets along with TIN Decimation to 3D Imaging of Seafloor from Multibeam Sonar Data

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Contemporary seabed mapping/imaging systems employing processed bottom echo records, acquired by a multibeam sonar, can map the bottom with the resolution to one meter. However, despite these advantages, even after employing data preprocessing, the method results in an excessive amount of data and the warehouse of petabytes. To address the problem of a compact representation of the huge amount of these raw data and an accurate seabed surface reconstruction from the multibeam sonar records, the paper proposes the data reduction algorithms developed for this purpose. The first one represents the smoothing procedure using B-spline surface obtained from a set of bathymetric 3D data retrieved from the sonar echoes. Whereas, the second one transforms the echo records to the discrete wavelet coefficients domain, and subsequently uses the wavelet shrinkage theory. The second stage in both methods consists of TIN (Triangular Irregular Network) decimation procedure, which reduces the number of polygons in the mesh, while maintaining the sufficient resolution and accuracy of the reconstructed seabed surfaces. Both investigated methods seem to be quite promising tools for significant data reduction and compact representation of seabed 3D images retrieved from the sonar echoes.
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Document Type: Research Article

Publication date: 01 September 2002

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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