Dr. Jui-Ching Lin Profile

Dr. Jui-Ching Lin

at Dow Inc

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Proceedings Article | 4 October 2016 Paper

Analysis of x-ray tomography data of an extruded low density styrenic foam: an image analysis study

Jui-Ching Lin, William Heeschen

Proceedings Volume 9967, 99671G (2016) https://doi.org/10.1117/12.2236676

KEYWORDS: Foam, 3D image processing, X-rays, Tomography, Machine learning, 3D metrology, Image analysis, Image segmentation, Image filtering, Image processing

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Extruded styrenic foams are low density foams that are widely used for thermal insulation. It is difficult to precisely characterize the structure of the cells in low density foams by traditional cross-section viewing due to the frailty of the walls of the cells. X-ray computed tomography (CT) is a non-destructive, three dimensional structure characterization technique that has great potential for structure characterization of styrenic foams. Unfortunately the intrinsic artifacts of the data and the artifacts generated during image reconstruction are often comparable in size and shape to the thin walls of the foam, making robust and reliable analysis of cell sizes challenging. We explored three different image processing methods to clean up artifacts in the reconstructed images, thus allowing quantitative three dimensional determination of cell size in a low density styrenic foam. Three image processing approaches - an intensity based approach, an intensity variance based approach, and a machine learning based approach - are explored in this study, and the machine learning image feature classification method was shown to be the best. Individual cells are segmented within the images after the images were cleaned up using the three different methods and the cell sizes are measured and compared in the study. Although the collected data with the image analysis methods together did not yield enough measurements for a good statistic of the measurement of cell sizes, the problem can be resolved by measuring multiple samples or increasing imaging field of view.

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