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Improved High Dynamic Range for 3D Shape Measurement based on Saturation of the Coloured Fringe

Shanyu Chua, Chee Chin Lim1, Swee Kheng Eng, Yen Fook Chong and Chiun Tai Loh

Pertanika Journal of Science & Technology, Volume 29, Issue 2, April 2021

DOI: https://doi.org/10.47836/pjst.29.2.04

Keywords: 3D scanning, fringe profilometry, phase-shifting profilometry

Published on: 30 April 2021

Phase-shifting fringe projection methods have been developed for three-dimensional scanning (Zuo et al., 2018). However, the 3-Dimensional (3D) scanning of objects with a high dynamic reflectivity range based on structured light is a challenging task to achieve (Feng et al., 2018). The incorrect intensities captured will cause phase and measurement errors. Thus, this paper proposes a method that improves the current High Dynamic Range (HDR) (Jiang et al., 2016)) method to increase the dynamic range. The camera and projector have 3 channels, red, green, and blue, which can absorb and project these lights independently. This paper proposes a method that makes use of this by controlling the intensity of each projected for the camera. Each image can be split into 3 channels and provide 3 images which contain different intensities, then it will be used to compute the 3D information. In general, this is done by controlling the projection of red, green and blue (RGB) channel and apply the Jiang’s algorithm (Jiang et al., 2016). The results are compared and analysed with current HDR (Jiang’s method) and the regular three-step phase-shifting methods. From the experimental results, it has shown that our proposed method outperforms the current HDR and the regular three-step phase-shifting methods. Specifically, the proposed method manages to increase the dynamic range of the reflective property of objects. Additionally, our proposed method has also significantly reduced the times of 3D object measurements.

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ISSN 0128-7680

e-ISSN 2231-8526

Article ID

JST-2248-2020

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