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Mosaicking Data in Seafloor Front-Scan Imaging

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In this paper, a complete set of methods able to generate and display geo-referenced acoustic images of the seafloor as well as compound mosaic images by starting from data obtained with a forward-looking sonar, are described. Actual acoustic images can be generated by two different projection methods: a simple analytical solution or a more precise ray-tracing approach. In particular, the ray-tracing scheme takes into account the actual bathymetry of an area, the sound velocity profile, and the changes in the position and attitude of the sonar system between pulse emission and each reception instant. To exploit the projection results in order to obtain an image defined over a dense matrix of pixels, an innovative interpolation algorithm, based on the generation of virtual beam signals (only when necessary), has been tested and compared with traditional techniques. The joint application of the ray-tracing projection approach and the virtual-beams interpolation technique allows one to generate high-quality images, which can be merged to create the mosaic image of a large seafloor area. The precision and quality of the resulting mosaics confirm the high degree of effectiveness of the methods proposed in this paper to project acoustic data and interpolate single images.
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Document Type: Research Article

Publication date: 2002-09-01

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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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