Improved watershed analysis for segmenting contacting particles of coarse granular soils in volumetric images
Improved watershed analysis for segmenting contacting particles of coarse granular soils in volumetric images
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DOI：
10.1016/j.powtec.2019.08.028
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发表时间：
2019-11-01
影响因子：
5.2
通讯作者：
Li, Cheng
中科院分区：
文献类型：
--
作者：
Sun, Quan;Zheng, Junxing;Li, Cheng
分水岭分析被广泛应用于从X射线计算机层析成像(X-ray CT)获得的体积图像中分割接触颗粒。然而，分水岭分析不能区分两个颗粒的接触和花生形状颗粒的“脖子”。然后，花生形状的颗粒被错误地过度分割为两个颗粒。为了解决这个问题，这项研究开发了一种改进的分水岭分析，它定义了一个无量纲参数α来区分接触和颈部。提出了一种基于参数α修正距离图的图像形态重建技术。为了克服过度分割问题，在改进的距离图上进行分水岭变换。用6个砂样验证了该方法的准确性和有效性。超分割对颗粒大小和形状表征的影响也被证明。结果表明，改进的三维分水岭分析方法能够有效地分割不同颗粒土壤的三维颗粒接触面，同时保持了不同颗粒土壤颈部的连续性。(C)2019爱思唯尔B.V.保留所有权利。
The watershed analysis has been widely used to segment contacting particles in volumetric images obtained from X-ray Computed Tomography (X-ray CT). However, the watershed analysis cannot discriminate between contacts of two particles and "necks" of peanut-shaped particles. Then, peanut-shaped particles are mistakenly oversegmented as two particles. To addresses this issue, this study developed an improved watershed analysis, which defines a dimensionless parameter alpha to discriminate contacts and necks. An image morphological reconstruction technique was developed to modify the distance map based on the parameter alpha. The watershed transform was performed on a modified distance map to overcome oversegmentation. The accuracy and effectiveness of the proposed technique were validated by six sand specimens. The influence of oversegmentation on particle size and shape characterizations were also demonstrated. The results showed that the improved 3D watershed analysis can effectively segment 3D particle contacts while preserving the continuity of necks for different granular soils. (C) 2019 Elsevier B.V. All rights reserved.