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Controlling an uninstrumented manipulator by visual servoing ArchiMer
Marchand, Eric; Chaumette, François; Spindler, F; Perrier, Michel.
In this paper we present a method to control the displacement of a robot arm with no proprioceptive sensor. The joint positions are not available and this manipulator is usually open-loop controlled. In order to get a more efficient control interface, we propose a closed-loop system based on an eye-to-hand visual servoing approach. We show that, using such an approach, measurement of the manipulator motion with proprioceptive sensors is not required to precisely control the end-effector motion. We propose solutions for position-based control and velocity control of the manipulator. To maintain. the end effector in the camera field of view, the camera orientation is also controlled. Various results show the validity and the efficiency of the approach.
Tipo: Text Palavras-chave: Real time; Pose computation; No proprioceptive sensors; Eye to hand visual servoing.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-758.pdf
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3D Reconstruction of Natural Underwater Scenes Using the Stereovision System IRIS ArchiMer
Brandou, Vincent; Allais, Anne-gaelle; Perrier, Michel; Malis, E.; Rives, P.; Sarrazin, Jozee; Sarradin, Pierre-marie.
The aim of this study is to propose a 3-dimension reconstruction method of small-scale scenes improved by a new image acquisition method for quantitative measurements. A stereovision system is used to acquire images in order to obtain several shots of an object, at regular intervals according to a predefined trajectory. A complete methodology of 3D reconstruction is exposed to perform a dense 3D model with texture mapping. A first result on natural images collected with the stereovision system during sea trials has been obtained.
Tipo: Text Palavras-chave: Underwater imaging; Stereovision system; Visual servoing; Dense disparity map; 3D reconstruction.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3598.pdf
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