Self-calibration and Motion Recovery from Silhouettes with Two Mirrors

Zhang, Hui, Shao, Ling and Wong, Kwan-Yee Kenneth (2013) Self-calibration and Motion Recovery from Silhouettes with Two Mirrors. In: 11th Asian Conference on Computer Vision, 5th - 9th November 2012, Daejeon, Korea.

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Official URL: http://dx.doi.org/10.1007/978-3-642-37447-0_1

Abstract

This paper addresses the problem of self-calibration and motion recovery from a single snapshot obtained under a setting of two mirrors. The mirrors are able to show five views of an object in one image. In this paper, the epipoles of the real and virtual cameras are firstly estimated from the intersection of the bitangent lines between corresponding images, from which we can easily derive the horizon of the camera plane. The imaged circular points and the angle between the mirrors can then be obtained from equal angles between the bitangent lines, by planar rectification. The silhouettes produced by reflections can be treated as a special circular motion sequence. With this observation, technique developed for calibrating a circular motion sequence can be exploited to simplify the calibration of a single-view two-mirror system. Different from the state-of-the-art approaches, only one snapshot is required in this work for self-calibrating a natural camera and recovering the poses of the two mirrors. This is more flexible than previous approaches which require at least two images. When more than a single image is available, each image can be calibrated independently and the problem of varying focal length does not complicate the calibration problem. After the calibration, the visual hull of the objects can be obtained from the silhouettes. Experimental results show the feasibility and the preciseness of the proposed approach.

Item Type: Conference or Workshop Item (Paper)
Subjects: G400 Computer Science
Department: Faculties > Engineering and Environment > Computer Science and Digital Technologies
Depositing User: Paul Burns
Date Deposited: 16 Jun 2015 14:21
Last Modified: 10 Aug 2015 11:07
URI: http://nrl.northumbria.ac.uk/id/eprint/22959

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