New Cubic Cross filter detector for multi beam data recorded with DIDSON acoustic camera

0330233 - BC 2010 RIV GR eng C - Conference Paper (international conference)
Balk, H. - Lindem, T. - Kubečka, Jan
New Cubic Cross filter detector for multi beam data recorded with DIDSON acoustic camera.
Underwater acoustic measurements, Technologies & Results. Heraklion: Foundation for Research & Technology, 2009 - (Papadakis, J.; Bjorno, L.), s. 1461-1468. ISBN 978-960-98883-3-2.
[Underwater acoustic measurements, Technologies & Results. Nafplion (GR), 21.06.2009-27.06.2009]
R&D Projects: GA ČR(CZ) GA206/07/1392
Institutional research plan: CEZ:AV0Z60170517
Keywords : fish tracking * fish detection
Subject RIV: BI - Acoustics

Target detection in data from the DIDSON (dual-frequency identification sonar) is a challenge. Due to high frequency and many narrow beams, the system can take series of acoustic pictures of passing fish. The entire body can be seen, but are often blurred and unclear in individual pictures. It is only when series of pictures are played like a film one can see that the target actually is a swimming fish. Hence, a good target detector should not be based on individual frames, but on using series of pictures. The Cross filter detector was originally designed for single, dual and split beam systems, to detect targets under very low signal to noise ratio conditions. In order to operate on multi beam data, we have added an extra dimension to the detecting filters. This resulted in a detector that takes into account both the time, range, and width dimensions in the data during the detection process. Preliminary tests of cubic detector were performed with various parameter settings.
Permanent Link: http://hdl.handle.net/11104/0176067