Full-field calibration and compensation of lateral chromatic aberration based on unwrapped phase

Xiaohong Liu; Shujun Huang; Zonghua Zhang; Feng Gao; Xiangqian Jiang

doi:10.1117/12.2245839

31 October 2016 Full-field calibration and compensation of lateral chromatic aberration based on unwrapped phase

Xiaohong Liu, Shujun Huang, Zonghua Zhang, Feng Gao, Xiangqian Jiang

Proceedings Volume 10021, Optical Design and Testing VII; 1002119 (2016) https://doi.org/10.1117/12.2245839
Event: SPIE/COS Photonics Asia, 2016, Beijing, China

Abstract

Lateral chromatic aberration (CA) of color cameras has great effects on the imaging quality. This paper presents a novel method to full-field calibrate lateral CA between color channels by using unwrapped phase data. Closed circle sinusoidal fringe patterns having the optimum three-fringe numbers are generated and displayed on a liquid crystal screen consecutively through red, green and blue channels. These closed fringe patterns are captured by a color camera. The wrapped phase and unwrapped phase of each pixel can be calculated by using four-step phase shifting algorithm and optimum three-fringe number method, respectively. The pixel deviations produced by lateral CA are computed by comparing the obtained absolute phase data between red, blue, and green channels in polar coordinate system and calibration is accomplished in Cartesian coordinate system. Lateral CA between color channels of the color camera can be compensated by using the calibrated data. Simulated and experimental results show the validity of the proposed calibration and compensation method.

Citation Download Citation

Xiaohong Liu, Shujun Huang, Zonghua Zhang, Feng Gao, and Xiangqian Jiang "Full-field calibration and compensation of lateral chromatic aberration based on unwrapped phase", Proc. SPIE 10021, Optical Design and Testing VII, 1002119 (31 October 2016); https://doi.org/10.1117/12.2245839

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KEYWORDS

Calibration

Cameras

LCDs

Fringe analysis

Chromatic aberrations

Imaging systems

3D metrology

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