An accurate projector calibration method based on polynomial distortion representation.
In structure light measurement systems or 3D printing systems, the errors caused by optical distortion of a digital projector always affect the precision performance and cannot be ignored. Existing methods to calibrate the projection distortion rely on calibration plate and photogrammetry, so the calibration performance is largely affected by the quality of the plate and the imaging system. This paper proposes a new projector calibration approach that makes use of photodiodes to directly detect the light emitted from a digital projector. By analyzing the output sequence of the photoelectric module, the pixel coordinates can be accurately obtained by the curve fitting method. A polynomial distortion representation is employed to reduce the residuals of the traditional distortion representation model. Experimental results and performance evaluation show that the proposed calibration method is able to avoid most of the disadvantages in traditional methods and achieves a higher accuracy. This proposed method is also practically applicable to evaluate the geometric optical performance of other optical projection system.
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. excalibur_s@tju.edu.cn.
Miao
M
Liu
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China. sunck@tju.edu.cn.
Changku
C
Sun
School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China. huangsj@hebut.edu.cn.
Shujun
S
Huang
School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China. zhzhang@hebut.edu.cn.
Zonghua
Z
Zhang
3D printing; aberration compensation; photodiode; projector calibration; structure light measurement; subpixel measurement