Calibration of photometric stereo point light source based on standard block

Yang Yang; Xianglong Wang; Hao Fan; Xukun Qin; Muwei Jian; Junyu Dong

doi:10.1117/12.2625962

30 April 2022 Calibration of photometric stereo point light source based on standard block

Yang Yang, Xianglong Wang, Hao Fan, Xukun Qin, Muwei Jian, Junyu Dong

Proceedings Volume 12177, International Workshop on Advanced Imaging Technology (IWAIT) 2022; 121771J (2022) https://doi.org/10.1117/12.2625962
Event: International Workshop on Advanced Imaging Technology 2022 (IWAIT 2022), 2022, Hong Kong, China

Abstract

Light sources’ position calibration is critical to photometric stereo. This paper presents a method for the light source position calibration based on a standard block. Unlike prior works that use mirror spheres, we use a calibration target consisting of a flat plane and a standard block placed on the plane with known length. By analyzing and reasoning the shadow produced by the standard block under a fixed light, we find that the relations of shadow and light conform to the principle of trigonometric geometry. The near light source’s position can be obtained according to the position relationship between the line segment and the inflection point in the shadow. Compared with other methods, our method is convenient and fast, and has better results.

Citation Download Citation

Yang Yang, Xianglong Wang, Hao Fan, Xukun Qin, Muwei Jian, and Junyu Dong "Calibration of photometric stereo point light source based on standard block", Proc. SPIE 12177, International Workshop on Advanced Imaging Technology (IWAIT) 2022, 121771J (30 April 2022); https://doi.org/10.1117/12.2625962

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KEYWORDS

Light sources

Calibration

Cameras

Optical spheres

Light

Error analysis

Light sources and illumination

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