3D global optimization of calibration parameters of deflectometry system by using a spherical mirror

Gao, Yiqian; Tian, Ziyang; Wei, Haoyun; Li, Yan

doi:10.1016/j.measurement.2023.113287

Cited by 3 publications

(1 citation statement)

References 24 publications

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“…Consequently, comparing the deformed mirror image with a standard reference pattern, the imperfection of the specular surface can be inferred [4,5]. Thanks to its high-speed inspection and measurement precision, this technique is applicable in many different fields, such as in window shields and car bodies in the automobile industry [6], solar collectors [7,8], etc.…”

Section: Introductionmentioning

confidence: 99%

Precise Phase Measurement for Fringe Reflection Technique through Optimized Camera Response

Hu,

Zhu,

Huang

et al. 2023

Sensors

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The Fringe Reflection is a robust and non-contact technique for optical measurement and specular surface characterization. The periodic alternation between dark and light cycles of the fringe patterns encodes the geometric information and provides a non-contact method of spatial measurement through phase extraction. Precisely expressing the positions of the points of the fringe pattern is a fundamental requirement for an accurate fringe reflection measurement. However, the nonlinear processes, both in generating the fringe pattern on a screen and capturing it using pixel values, cause inevitable errors in the phase measurement and eventually reduce the system’s precision. Aiming at reducing these nonlinear errors, we focus on constructing a new quantity from the pixel values of the photos of the fringe patterns that could linearly respond to the ideal fringe pattern. To this end, we hypothesize that the process of displaying the fringe pattern on a screen using a control function is similar to the process of capturing the pattern and converting the illuminating information into pixel values, which can be described using the camera’s response function. This similarity allows us to build a scaled energy quantity that could have a better linear relation with the control function. We optimize the extracted camera response function using an objective to increase the precision and reduce the quoted error. Experiments designed to determine the positions of points along the quartile lines verify the effectiveness of the proposed method in improving fringe reflection measurement precision.

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Section: Introductionmentioning

confidence: 99%

Precise Phase Measurement for Fringe Reflection Technique through Optimized Camera Response

Hu,

Zhu,

Huang

et al. 2023

Sensors

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A 3D curved optical surface defect detection method with micro structured-light based on Multi-Parameter calibration

Li,

Hou,

Zhao

et al. 2024

Measurement

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Holistic calibration method of deflectometry by holonomic framework priors

Lang,

Zhang,

Chen

et al. 2024

Opt. Lett.

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Phase measuring deflectometry is a powerful measurement tool of optical surfaces, but the measuring accuracy relies on the quality of system calibration. Calibration errors arise from the oversimplified imaging models, error accumulation and amplification, and the bias in numerical optimization. A holistic calibration method is proposed to shorten the error propagation chain. The descriptive prowess of the imaging system is enhanced by calculating each incident ray independently and compensating the systematic errors resulting from the form error of the calibration mirror. Finally, a holonomic framework prior is defined to guarantee the calibration reliability by utilizing the physical constraints of the measurement system. Experimental results demonstrate that the proposed method improves measurement accuracy by at least 38% compared to traditional approaches.

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3D global optimization of calibration parameters of deflectometry system by using a spherical mirror

Cited by 3 publications

References 24 publications

Precise Phase Measurement for Fringe Reflection Technique through Optimized Camera Response

Precise Phase Measurement for Fringe Reflection Technique through Optimized Camera Response

A 3D curved optical surface defect detection method with micro structured-light based on Multi-Parameter calibration

Holistic calibration method of deflectometry by holonomic framework priors

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