A three-dimensional reconstruction algorithm of nonwoven fabric based on an anthill model

Abstract

The structure of nonwoven fabric has a great influence on the fabric properties, and the filtration performance of the fabric is determined by its pore structures and key parameters such as pore size, distribution and porosity, which should be described accurately and appropriately. However, at present problems exist in the methods of describing the three-dimensional structure of nonwovens, such as the high cost, slow speed and inaccurate model. This paper proposes a new method of reconstruction algorithm, inspired by the criss-cross internal structure of nonwovens. This nonwoven structure with a certain depth presents some implication of the processing information, which is similar to the formation of an anthill. The reconstructing processes are as follows. First, the multi-focused images of fibers are captured by the microscope and the images are then fused into a two-dimensional image. Second, the three-dimensional coordinate of the source point is calculated by the fiber segmentation and One-to-Many projection. Finally, the fiber axis is generated by connecting the source point according to the prescribed conditions, and then the closed three-dimensional surface is the three-dimensional path of a dynamic-radius sphere rolling along the fiber axis. The experiment results demonstrate that the proposed method can reconstruct the accurate structure of the nonwoven fabric and retain its vertical connection information, which is of great significance to the interception of harmful substances, the production and preparation of filter medium and the follow-up study of the filtration mechanism.

Reconstruction of 3D Non-Rigid Moving Human Targets Based on Reliable Estimation of Contour Deformation Degree

“…Numerous scholars have conducted extensive research on issues in related fields. Li, C, and others conducted research on 3D reconstruction algorithms based on the ant hill model [2]. However, this method uses a dynamic radius sphere to roll along the fiber axis to construct a closed 3D surface, which suffers from unstable path tracking and results in inaccurate 3D reconstruction results.…”

An improved algorithm for three-dimensional reconstruction of nonwoven microstructures by using multi-focus images

“…In the recent literature, we have found the application of image processing technology by some scholars [7][8][9] to describe the structure of nonwovens, particularly the scanning electron microscope (SEM), 10 the digital volumetric imaging (DVI) micro-imager, 11 computer tomography (CT), 12,13 and the optical microscope (OM). 14,15 However, these methods cannot reconstruct the internal longitudinal structure of nonwovens completely or in a systematic way. Most of the reconstructed structure is an inseparable whole; the fiber cannot be disassembled for analysis, as the process of reconstructing will lose the independence and coherence of the fiber itself.…”