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Cayley approach for 3D points registration in visual SLAM

ZHANG Hongyan, WANG Jingyan, ZHOU Lusha, WANG Binghui   

  1. (Sino-European Institute of Aviation Engineering, CAUC, Tianjin 300300, China)
  • Received:2017-01-10 Revised:2017-02-23 Online:2017-10-25 Published:2017-12-14

Abstract: An essential problem in SLAM system is to compute the 3D rigid body transformation of cameras, which aligns two sets of points when correspondences are known. The errors accumulated during the locating and mapping process result in the drift of scale for the pairs of points. The Euclidean transformation will be degraded into the similarity transformation due to the drift. A closed-form solution using Cayley transform is presented to estimate the similarity transformation between 3D corresponding points. The accuracy and robustness of the proposed Cayley approach are verified by simulation and error analysis. Apart from SLAM system, this approach is also suitable for 3D reconstruction and registration in computer vision.

Key words: SLAM, 3D registration, similarity transformation, Cayley transform

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