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Bin-scanning:Segmentation of X-ray CT volume of binned parts using Morse skeleton graph of distance transform

Computational Visual Media 2023年第2期9卷 319-333页

作者： Yuta Yamauchi tatsuya yatagawa Yutaka Ohtake Hiromasa Suzuki School of Engineering The University of Tokyo7–3–1HongoBunkyo-kuTokyoJapan

X-ray CT scanners,due to the transmissive nature of X-rays,have enabled the non-destructive evaluation of industrial products,even inside their *** light of its effectiveness,this study introduces a new approach to accelerate the inspection of many mechanical parts with the same shape in a *** input to this problem is a volumetric image(i.e.,CT volume)of many parts obtained by a single CT *** need to segment the parts in the volume to inspect each of them;however,random postures and dense contacts of the parts prohibit part segmentation using traditional template *** address this problem,we convert both the scanned volumetric images of the template and the binned parts to simpler graph structures and solve a subgraph matching problem to segment the *** perform a distance transform to convert the CT volume into a distance ***,we construct a graph based on Morse theory,in which graph nodes are located at the extremum points of the distance *** experimental evaluation demonstrates that our fully automatic approach can detect target parts appropriately,even for a heap of 50 ***,the overall computation can be performed in approximately 30 min for a large CT volume of approximately 2000×2000×1000 voxels.

关键词： X-ray computed tomography(CT) volume segmentation graph matching non-destructive inspection

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Real-time rendering of layered materials with anisotropic normal distributions

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Computational Visual Media 2020年第1期6卷 29-36页

作者： Tomoya Yamaguchi tatsuya yatagawa Yusuke Tokuyoshi Shigeo Morishima Waseda University Tokyo155-8885Japan The University of Tokyo Tokyo153-8656Japan Intel Corporation CA95054USA

This paper proposes a lightweight bidirectional scattering distribution function(BSDF)model for layered materials with anisotropic reflection and refraction *** our method,each layer of the materials can be described by a microfacet BSDF using an anisotropic normal distribution function(NDF).Furthermore,the NDFs of layers can be defined on tangent vector fields,which differ from layer to *** method is based on a previous study in which isotropic BSDFs are approximated by projecting them onto base ***,the adequateness of this previous work has not been well investigated for anisotropic *** this paper,we demonstrate that the projection is also applicable to anisotropic BSDFs and that the BSDFs are approximated by elliptical distributions using covariance matrices.

关键词： layered materials microfacet BSDF reflection modeling real-time rendering

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