Texture-based detection of sea wave direction

Karathanassi, V; Topouzelis, K; Sarantopoulos, D

dc.contributor.author	Karathanassi, V	en
dc.contributor.author	Topouzelis, K	en
dc.contributor.author	Sarantopoulos, D	en
dc.date.accessioned	2014-03-01T02:49:55Z
dc.date.available	2014-03-01T02:49:55Z
dc.date.issued	2004	en
dc.identifier.issn	0277786X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/34788
dc.subject	Cooccurrence matrix	en
dc.subject	Range dependence	en
dc.subject	SAR	en
dc.subject	Texture	en
dc.subject	Velocity bunching	en
dc.subject	Wave direction	en
dc.subject.other	Data acquisition	en
dc.subject.other	Doppler effect	en
dc.subject.other	Image processing	en
dc.subject.other	Mathematical models	en
dc.subject.other	Matrix algebra	en
dc.subject.other	Modulation	en
dc.subject.other	Nonlinear systems	en
dc.subject.other	Speckle	en
dc.subject.other	Statistical methods	en
dc.subject.other	Synthetic aperture radar	en
dc.subject.other	Textures	en
dc.subject.other	Velocity measurement	en
dc.subject.other	Water waves	en
dc.subject.other	Wave propagation	en
dc.subject.other	Cooccurrence matrix	en
dc.subject.other	Range dependence	en
dc.subject.other	Velocity bunching	en
dc.subject.other	Wave direction	en
dc.subject.other	Radar imaging	en
dc.title	Texture-based detection of sea wave direction	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1117/12.564631	en
heal.identifier.secondary	http://dx.doi.org/10.1117/12.564631	en
heal.identifier.secondary	81	en
heal.publicationDate	2004	en
heal.abstract	Various phenomena in the radar imaging mechanism, such as velocity bunching, azimuthal cutoff, tilt modulation, range dependence etc affect the SAR image. Among them, velocity bunching and azimuthal cutoff, straightly related to SAR azimuth direction, have been most investigated. However, in this study, the range factor, mainly due to lower radar image intensity for far range, is proved to be more pronounced. In the study framework, 2nd order texture analysis was performed in order to investigate a) the potential of texture to detect wave direction, b) wave range dependence, and c) velocity bunching effects. For this purpose, the Haralick Cooccurrence matrix was calculated on a despeckled ERS2 image for four directions. Eight texture images were generated and compared to the wave direction resulting from the TOPEX/POSEIDON model. The comparison showed that a) the texture image produced in the range direction detected sea wave direction efficiently, and b) accuracy was affected by the range factor. Thus, a range correction was proposed and implemented on the despeckled texture images. Following this correction, an accuracy of 88.6% was achieved for wave direction detection, if texture is calculated along the range direction and 74.9% if texture is calculated along the azimuth direction.	en
heal.journalName	Proceedings of SPIE - The International Society for Optical Engineering	en
dc.identifier.doi	10.1117/12.564631	en
dc.identifier.volume	5574	en
dc.identifier.spage	482	en
dc.identifier.epage	492	en