Media type: Electronic Conference Proceeding Title: Automatic detection in a maritime environment: gradient filter versus intensity background estimation Contributor: van Valkenburg-van Haarst, Tanja Y. C.; Bolderheij, Fok; Groen, Frans C. A. imprint: SPIE, 2008 Published in: SPIE Proceedings Extent: Language: Not determined DOI: 10.1117/12.777061 ISSN: 0277-786X Origination: Footnote: