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arXiv 2301.07587stat.AP
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利用CT数据和R-vine Copula函数对颗粒形态和矿物组成的多维表征

Multidimensional characterization of particle morphology and mineralogical composition using CT data and R-vine copulas

Orkun Furat, Tom Kirstein, Thomas Leißner, Kai Bachmann, Jens Gutzmer, Urs A. Peuker, Volker Schmidt

摘要:

计算机断层扫描(CT)可以捕获足够大的体积,以测量统计学上有意义的数量的微米级颗粒,并具有足够好的分辨率,以允许分析单个颗粒。然而,有效地调查这样的图像数据和可解释的模型所观察到的颗粒特征的方法的发展仍然是一个活跃的研究领域。当考虑表现出广泛的形状和尺寸的颗粒的图像数据时,传统的图像分割方法,例如经典的分水岭算法,难以以令人满意的精度识别颗粒。因此,必须利用更先进的机器学习方法进行图像分割,以提高后续分析的有效性。此外,CT数据不包括关于颗粒的矿物组成的信息,因此,必须采集附加的SEM-EDS图像数据。在本文中,显微CT图像数据的颗粒系统主要由锌华石-石英复合材料被认为是。首先,应用图像分割方法,其使用深度卷积神经网络,特别是U-网架构的适配。这具有比其他机器学习方法需要更少的手动标记的优点,同时也具有迁移学习的可能性。然后,完全参数化模型的基础上藤copula的设计,以确定多变量概率分布的描述符向量的大小,形状,纹理和组成的颗粒-允许的估计和可解释的表征颗粒描述符之间的相互依赖性。对于模型拟合,使用分割的三维CT数据和共配准的二维SEM-EDS数据。

英文摘要:

Computed tomography (CT) can capture volumes large enough to measure a statistically meaningful number of micron-sized particles with a sufficiently good resolution to allow for the analysis of individual particles. However, the development of methods to efficiently investigate such image data and interpretably model the observed particle features is still an active field of research. When image data of particles exhibiting a wide range of shapes and sizes is considered, traditional image segmentation methods, such as the classic watershed algorithm, struggle to recognize particles with satisfying accuracy. Thus, more advanced methods of machine learning must be utilized for image segmentation to improve the validity of subsequent analyzes. Moreover, CT data does not include information about the mineralogical composition of particles and, therefore, additional SEM-EDS image data has to be acquired. In this paper, micro-CT image data of a particle system mostly consisting of zinnwaldite-quartz composites is considered. First, an image segmentation method is applied which uses deep convolutional neural networks, in particular an adaptation of the U-net architecture. This has the advantage of requiring less hand-labeling than other machine learning methods, while also being more flexible with the possibility of transfer learning. Then, fully parameterized models based on vine copulas are designed to determine multivariate probability distributions of descriptor vectors for the size, shape, texture and composition of particles -- allowing for the estimation and interpretable characterization of interdependencies between particle descriptors. For model fitting, the segmented three-dimensional CT data and co-registered two-dimensional SEM-EDS data are used.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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