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Journal of Information Science and Engineering, Vol. 24 No. 5, pp. 1551-1565 (September 2008)

Calibration of Motorized Object Rig and Its Applications*

Pang-Hung Huang1, Yu-Pao Tsai2, Wan-Yen Lo, Sheng-Wen Shih3 and Yi-Ping Hung1,2,4
 1Department of Computer Science and Information Engineering
2Graduate Institute of Networking and Multimedia
National Taiwan University
Taipei, 106 Taiwan
3Institute of Information Science
Academia Sinica
Taipei, 105 Taiwan
Email: hung@csie.ntu.edu.tw
4Department of Computer Science and Information Engineering
National Chi Nan University
Nantou, 545 Taiwan

Object Movies (OMs) have been successfully used in many applications. However, the techniques for acquiring OMs still need to be improved if high-quality and efficient OMs are desired. In this paper, we present a method for calibrating a motorized object rig to facilitate the acquisition of OMs. We first apply the CPC kinematic model to formulate the 3D configuration of the device, and then propose a method to estimate the parameters of the CPC model of the device. Furthermore, a visual tool is provided for users to adjust the controllable axes of the rig according to the estimated results. After this calibration, more accurate camera parameters can be obtained and then be used for different purposes. In this work, we use the parameters to reconstruct, from an OM, the 3D model of the 3D object, and then adjust the OM according to the center of the 3D model so that a high-quality OM can be obtained for rendering.

Keywords: object movie, camera calibration, CPC kinematic model, 3D reconstruction, motorized object rig

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Received September 29, 2006; revised April 13 & December 6, 2007; accepted January 17, 2008.
Communicated by Pau-Choo Chung.
*This work was supported in part by the National Science Council of Taiwan, R.O.C. under grants No. NSC 93-2422-H-002-022, NSC 93-2422-H-001-0004, and 96-EC-17-A-02-S1-032.