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http://dx.doi.org/10.7843/kgs.2011.27.11.093

Image Calibration Techniques for Removing Cupping and Ring Artifacts in X-ray Micro-CT Images  

Jung, Yeon-Jong (Dept. of Civil and Environmental Engineering, Yonsei Univ.)
Yun, Tae-Sup (Dept. of Civil and Environmental Engineering, Yonsei Univ.)
Kim, Kwang-Yeom (Korea Institute of Construction Technology)
Choo, Jin-Hyun (Korea Institute of Construction Technology)
Publication Information
Journal of the Korean Geotechnical Society / v.27, no.11, 2011 , pp. 93-101 More about this Journal
Abstract
High quality X-ray computed microtomography (micro-CT) imaging of internal microstructures and pore space in geomaterials is often hampered by some inherent noises embedded in the images. In this paper, we introduce image calibration techniques for removing the most common noises in X-ray micro-CT, cupping (brightness difference between the periphery and central regions) and ring artifacts (consecutive concentric circles emanating from the origin). The artifacts removal sequentially applies coordinate transformation, normalization, and low-pass filtering in 2D Fourier spectrum to raw CT-images. The applicability and performance of the techniques are showcased by describing extraction of 3D pore structures from micro-CT images of porous basalt using artifacts reductions, binarization, and volume stacking. Comparisions between calibrated and raw images indicate that the artifacts removal allows us to avoid the overestimation of porosity of imaged materials, and proper calibration of the artifacts plays a crucial role in using X-ray CT for geomaterials.
Keywords
Cupping artifacts; Image processing; Pore space; Ring artifacts; X-ray micro-CT;
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Times Cited By KSCI : 1  (Citation Analysis)
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