NDLI: Towards more accurate shadow modelling for simulated SAS imagery

Content Provider	IEEE Xplore Digital Library
Author	Hunter, A.J. Hayes, M.P.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Canterbury Univ., Christchurch, New Zealand (Hunter, A.J.; Hayes, M.P.)
Abstract	Shadows are a feature of particular interest in Synthetic Aperture Sonar (SAS) imagery. Shadows are cast by objects or features that are proud of the sea-floor. The shape of a shadow reveals information on the structure of the object or feature and can be used to assist in target classification. In most existing simulated imagery, the shadows are well-defined and resemble those obtained by conventional, high-frequency sonars. In practice, shadows are not well-defined or are sometimes lost in imagery obtained by low-frequency, free-towed, shallow-water SAS systems. In this paper, we show our attempts to simulate realistic SAS imagery and demonstrate some of the mechanisms responsible for the shadow degradation that is seen in practice. Our simulator uses a novel facet-based scattering model that incorporates wide-beam effects, shadowing, and multiple scattering. Using our simulator, we show that the fidelity of the shadow region is degraded by wide-beam effects, multi-path scattering from the sea-surface, and reconstruction artefacts caused by deviations from a linear tow-path.
Starting Page	713
Ending Page	718
File Size	885873
Page Count	6
File Format	PDF
ISBN	0780391039
DOI	10.1109/OCEANSE.2005.1511802
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-20
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Synthetic aperture sonar Acoustic scattering Computational modeling Degradation Computer simulation Shape Acoustic beams Shadow mapping Image reconstruction Image resolution
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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