NDLI: Compensating images for absorption variations before acoustic seabed classification

Content Provider	IEEE Xplore Digital Library
Author	Maushake, C. Schiller, U. Preston, J.
Copyright Year	2011
Description	Author affiliation: Bundesanstalt für Wasserbau, Abteilung Wasserbau im Küstenbereich, Hamburg, Germany (Maushake, C.; Schiller, U.) \|\| Quester Tangent Corporation, Saanichton, BC, Canada (Preston, J.)
Abstract	Dividing sonar images into regions that have similar seabeds is often done by expert interpretation. Automated classification systems are becoming more widely used. This paper describes techniques, based on image amplitudes and texture, that lead to useful and practical automated segmentation of multibeam images. Seabed (or riverbed or lakebed) type affects amplitudes and texture, but so do system operating details, water conditions, and survey geometry. Effects of the last three must be compensated to isolate the effects of seabed type. Images from multibeam surveys are accompanied by bathymetric data from which grazing angles of all sonar footprints can be calculated. By compiling tables of amplitude against range and grazing angle, systematic changes in amplitude with these two variables can be removed consistently. If sound absorption varies, though, this empirical method compensates with some average absorption and local effects get lost. This paper explores using independent absorption data for calculated range compensation, and shows that the accuracy of maps of acoustic classes is thereby improved.
Starting Page	1
Ending Page	8
File Size	1481051
Page Count	8
File Format	PDF
ISBN	9781457714276
e-ISBN	9780933957398
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Absorption Sediments Sonar Rivers Backscatter Acoustics Tides turbidity acoustic absorption acoustic seabed classification image compensation suspended sediment
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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