The research on calibration methods of dual-CCD laser three-dimensional human face scanning system

Jinjiang Wang; Tianyu Chang; Baozhen Ge; Qingguo Tian; Fengting Yang; Shendong Shi

doi:10.1117/12.2045916

19 September 2013 The research on calibration methods of dual-CCD laser three-dimensional human face scanning system

Jinjiang Wang, Tianyu Chang, Baozhen Ge, Qingguo Tian, Fengting Yang, Shendong Shi

Proceedings Volume 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications; 890535 (2013) https://doi.org/10.1117/12.2045916
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

In this paper, on the basis of considering the performance advantages of two-step method, we combines the stereo matching of binocular stereo vision with active laser scanning to calibrate the system. Above all, we select a reference camera coordinate system as the world coordinate system and unity the coordinates of two CCD cameras. And then obtain the new perspective projection matrix (PPM) of each camera after the epipolar rectification. By those, the corresponding epipolar equation of two cameras can be defined. So by utilizing the trigonometric parallax method, we can measure the space point position after distortion correction and achieve stereo matching calibration between two image points. Experiments verify that this method can improve accuracy and system stability is guaranteed. The stereo matching calibration has a simple process with low-cost, and simplifies regular maintenance work. It can acquire 3D coordinates only by planar checkerboard calibration without the need of designing specific standard target or using electronic theodolite. It is found that during the experiment two-step calibration error and lens distortion lead to the stratification of point cloud data. The proposed calibration method which combining active line laser scanning and binocular stereo vision has the both advantages of them. It has more flexible applicability. Theory analysis and experiment shows the method is reasonable.

Citation Download Citation

Jinjiang Wang, Tianyu Chang, Baozhen Ge, Qingguo Tian, Fengting Yang, and Shendong Shi "The research on calibration methods of dual-CCD laser three-dimensional human face scanning system", Proc. SPIE 8905, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Sensing and Imaging and Applications, 890535 (19 September 2013); https://doi.org/10.1117/12.2045916

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KEYWORDS

Calibration

Cameras

Imaging systems

Distortion

Stereo vision systems

Clouds

Laser scanners

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