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Sensors 2017, 17(5), 1048; doi:10.3390/s17051048

Full-Field Calibration of Color Camera Chromatic Aberration using Absolute Phase Maps

1
School of Mechanical Engineering, Hebei University of Technology, Tianjin 300130, China
2
Centre for Precision Technologies, University of Huddersfield, Huddersfield HD1 3DH, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 26 March 2017 / Revised: 28 April 2017 / Accepted: 3 May 2017 / Published: 6 May 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [8410 KB, uploaded 6 May 2017]   |  

Abstract

The refractive index of a lens varies for different wavelengths of light, and thus the same incident light with different wavelengths has different outgoing light. This characteristic of lenses causes images captured by a color camera to display chromatic aberration (CA), which seriously reduces image quality. Based on an analysis of the distribution of CA, a full-field calibration method based on absolute phase maps is proposed in this paper. Red, green, and blue closed sinusoidal fringe patterns are generated, consecutively displayed on an LCD (liquid crystal display), and captured by a color camera from the front viewpoint. The phase information of each color fringe is obtained using a four-step phase-shifting algorithm and optimum fringe number selection method. CA causes the unwrapped phase of the three channels to differ. These pixel deviations can be computed by comparing the unwrapped phase data of the red, blue, and green channels in polar coordinates. CA calibration is accomplished in Cartesian coordinates. The systematic errors introduced by the LCD are analyzed and corrected. Simulated results show the validity of the proposed method and experimental results demonstrate that the proposed full-field calibration method based on absolute phase maps will be useful for practical software-based CA calibration. View Full-Text
Keywords: chromatic aberration; closed sinusoidal fringe patterns; absolute phases; LCD (liquid crystal display) screen; systematic errors; deviation calibration chromatic aberration; closed sinusoidal fringe patterns; absolute phases; LCD (liquid crystal display) screen; systematic errors; deviation calibration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, X.; Huang, S.; Zhang, Z.; Gao, F.; Jiang, X. Full-Field Calibration of Color Camera Chromatic Aberration using Absolute Phase Maps. Sensors 2017, 17, 1048.

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