Accurate camera calibration method specialized for virtual studios

Hidehiko Okubo; Yuko Yamanouchi; Hideki Mitsumine; Takashi Fukaya; Seiki Inoue

doi:10.1117/12.769163

8 February 2008 Accurate camera calibration method specialized for virtual studios

Hidehiko Okubo, Yuko Yamanouchi, Hideki Mitsumine, Takashi Fukaya, Seiki Inoue

Proceedings Volume 6804, The Engineering Reality of Virtual Reality 2008; 68040F (2008) https://doi.org/10.1117/12.769163
Event: Electronic Imaging, 2008, San Jose, California, United States

Abstract

Virtual studio is a popular technology for TV programs, that makes possible to synchronize computer graphics (CG) to realshot image in camera motion. Normally, the geometrical matching accuracy between CG and realshot image is not expected so much on real-time system, we sometimes compromise on directions, not to come out the problem. So we developed the hybrid camera calibration method and CG generating system to achieve the accurate geometrical matching of CG and realshot on virtual studio. Our calibration method is intended for the camera system on platform and tripod with rotary encoder, that can measure pan/tilt angles. To solve the camera model and initial pose, we enhanced the bundle adjustment algorithm to fit the camera model, using pan/tilt data as known parameters, and optimizing all other parameters invariant against pan/tilt value. This initialization yields high accurate camera position and orientation consistent with any pan/tilt values. Also we created CG generator implemented the lens distortion function with GPU programming. By applying the lens distortion parameters obtained by camera calibration process, we could get fair compositing results.

Citation Download Citation

Hidehiko Okubo, Yuko Yamanouchi, Hideki Mitsumine, Takashi Fukaya, and Seiki Inoue "Accurate camera calibration method specialized for virtual studios", Proc. SPIE 6804, The Engineering Reality of Virtual Reality 2008, 68040F (8 February 2008); https://doi.org/10.1117/12.769163

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