New calibration approach for light stripe sensor

Qingyang Wu; Xianyu Su; Bin Hui; Jingzhen Li

doi:10.1117/12.783360

27 November 2007 New calibration approach for light stripe sensor

Qingyang Wu, Xianyu Su, Bin Hui, Jingzhen Li

Proceedings Volume 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 67232W (2007) https://doi.org/10.1117/12.783360
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

A simple, flexible and real-time calibration method is proposed to solve the calibrating problems of line structure light sensor such as requirement of high accurate calibration model, complicated calibrating procedure and so on. First, a 2D calibration plane with tessellated pattern is placed at several arbitrary places in the measurement range of sensor, and the pictures of calibration board on these positions are recoded. The parameters of camera are estimated from these pictures. Secondly, the line structure light is turned on, and projected on the surface of calibration board. Several pictures are captured while the board is being moved along the direction of line structure light. Thirdly, the rotating matrixes and transform vectors between the local coordinates of these planes and the global coordinate of sensor are estimated. The global coordinates of the control points falling on the line structure light plane were calculated according to these matrixes and vectors. Finally, the model parameters of the sensor at working state are optimized with these control points. The cost of calibration equipment is greatly reduced and the calibrating procedure is simplified with the proposed approach. So it can promote the engineering applications of the line structure light sensor. It shows that this method is practical for surface measurement. The height error (RMS) of the measured object reaches 0.03mm in the region of 200mm x 150mm.

Citation Download Citation

Qingyang Wu, Xianyu Su, Bin Hui, and Jingzhen Li "New calibration approach for light stripe sensor", Proc. SPIE 6723, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 67232W (27 November 2007); https://doi.org/10.1117/12.783360

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KEYWORDS

Calibration

Cameras

Sensors

Distortion

Optical sensors

Imaging systems

Control systems

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