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A New Strategy for Feature Initialization in Visual SLAM

By Guillaume Bresson, Thomas Féraud, Romuald Aufrère, Paul Checchin and Roland Chapuis


International audienceThis paper presents a Visual EKF-SLAM process using an original and very efficient strategy for initializing landmarks. Usually, with Cartesian coordinates, new points are created along the line-of-sight with a large variance. However, this type of initialization is subject to significant linearization issues making landmarks diverge from their real position. The immediate consequence is a failure of the Visual SLAM process. We propose here a new strategy that avoids or drastically limits the linearization errors. The first part of this strategy takes place during the tracking process where a coherent window is needed in order to successfully follow a point and make it converge. The second part concerns the update step. Due to linearization errors, a landmark in front of the observer can be updated behind it. We compute a corrective of the Kalman gain in order to preserve the integrity. We applied this strategy to real data illustrating its efficiency

Topics: [SPI.AUTO]Engineering Sciences [physics]/Automatic
Publisher: HAL CCSD
Year: 2011
OAI identifier: oai:HAL:hal-01351394v1
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