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	Provedor de dados ArchiMer (1) Autor Cadiou, Jean-francois (1) Rochet, Marie-joelle (1) Trenkel, Verena (1) Palavra-chave Auto focus method (1) Error estimation (1) Fish lenght (1) Laser method (1) Measurement methods (1) Tipo do documento Text (1) Ano 2006 (1) País France (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 1 Primeira ... 1 ... Última Precision and accuracy of fish length measurements obtained with two visual underwater methods ArchiMer Rochet, Marie-joelle; Cadiou, Jean-francois; Trenkel, Verena. During the VIITAL cruise in the Bay of Biscay in summer 2002, two devices for measuring the length of swimming fish were tested: 1) a mechanical crown that emitted a pair of parallel laser beams and that was mounted on the main camera and 2) an underwater auto-focus video camera. The precision and accuracy of these devices were compared and the various sources of measurement errors were estimated by repeatedly measuring fixed and mobile objects and live fish. It was found that fish mobility is the main source of error for these devices because they require that the objects to be measured are perpendicular to the field of vision. The best performance was obtained with the laser method where a video-replay of laser spots (projected on fish bodies) carrying... Tipo: Text Palavras-chave: Auto focus method; Laser method; Error estimation; Measurement methods; Fish lenght. Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-978.pdf Registros recuperados: 1 Primeira ... 1 ... Última

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