科研成果详情

题名Auto-calibration and motion recovery from silhouettes for turntable sequences
作者
发表日期2005
会议名称16th British Machine Vision Conference, BMVC 2005
会议录名称BMVC 2005 - Proceedings of the British Machine Vision Conference 2005
会议日期5 September 2005--8 September 2005
会议地点Oxford
摘要

This paper addresses the problem of structure and motion from silhouettes for turntable sequences. Previous works have exploited corresponding points induced by epipolar tangencies to estimate the image invariants under turntable motion and recover the epipolar geometry. In these approaches, however, camera intrinsics are needed in order to obtain Euclidean motion and reconstruction. This paper proposes a novel approach to precisely estimate the image invariants and the rotation angles in the absence of the camera intrinsics, and to perform auto-calibration. By exploiting a special parameterization of the epipoles, it is shown that the imaged circular points can be formulated in terms of the image invariants. A fixed scalar k, introduced to account for the different scales in the homogeneous representations of the image invariants used in the parameterizations, is found crucial in both calibration and motion estimation. Given the image invariants, namely the horizon, the imaged rotation axis and its orthogonal vanishing point, this scalar can be determined from the epipoles in an image triplet. A robust method for estimating k is proposed and the rotation angles can be recovered using this estimated value of k. All the estimated variables are then refined using bundle-adjustment and auto-calibration is performed using the imaged circular points, the imaged rotation axis and the associated vanishing point. This allows the recovery of the full camera positions and orientations, and hence Euclidean reconstruction. Experimental results demonstrate the simplicity of this novel approach and the high precision in the estimated motion and reconstruction.

DOI10.5244/C.19.7
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语种英语English
Scopus入藏号2-s2.0-84898432982
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被引频次[WOS]:0   [WOS记录]     [WOS相关记录]
文献类型会议论文
条目标识符https://repository.uic.edu.cn/handle/39GCC9TT/6856
专题个人在本单位外知识产出
作者单位
Department of Computer Science, University of Hong Kong,Pokfulam Rd.,Hong Kong,Hong Kong
推荐引用方式
GB/T 7714
Zhang, Hui,Zhang, Guoqiang,Wong, Kwan Yee Kenneth. Auto-calibration and motion recovery from silhouettes for turntable sequences[C], 2005.
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