Non-uniform illumination correction based on the retinex theory in digital image correlation measurement method

• Autorzy: Gu G. , She B. , Xu G. , Xu X.

Identyfikatory

DOI

10.5277/oa170203

• Języki publikacji: EN

Abstrakty

EN

Digital image correlation is a well-known optical measurement method for full-field deformation and strain measurements. The quality of speckle images used in digital image correlation calculation can directly affect the measurement accuracy of digital image correlation. In most practical measurement circumstances, a uniform illumination environment is usually required to illuminate the detected object in order to capture speckle images upon different deformed states with uniform background intensity. However, the tested object becomes so large that the adopted light source cannot cover all the interested area with uniform illumination, and the speckle images acquired by CCD camera may have non-uniform background intensity distributions. In this paper, the influence of non-uniform illumination is first analyzed in detail by means of a comparison of experimental results of digital image correlation using speckle patterns with both uniform and non-uniform intensity distributions. Then, a new correctional method based on the combination of the basic retinex theory and the illumination formulae of a point light source is proposed. Finally, a real experiment with non-uniform illumination is implemented to verify the effectiveness of this method.

Słowa kluczowe

EN

digital image correlation (DIC); non-uniform illumination correction; retinex theory; deformation measurement

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2017
• Tom: Vol. 47, nr 2
• Strony: 199--208
• Opis fizyczny: Bibliogr. 13 poz., rys.

Twórcy

autor

Gu G.

• School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China

autor

She B.

• School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China

autor

Xu G.

• School of Civil Engineering, Yancheng Institute of Technology, Yancheng 224051, China

autor

Xu X.

• Shenzhen Orbbec Co., Ltd., Shenzhen 518000, China

Bibliografia

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• [9] XIAO-YONG LIU, QING-CHANG TAN, LEI XIONG, GUO-DONG LIU, JIAN-YING LIU, XIN YANG, CHUN-YAN WANG, Performance of iterative gradient-based algorithms with different intensity change models in digital image correlation, Optics and Laser Technology 44(4), 2012, pp. 1060–1067.
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• [13] JIA LI, Application of image enhancement method of digital images based on retinex theory, Optik – International Journal for Light and Electron Optics 124(23), 2013, pp. 5986–5988.

Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).