The object of this work is to use image analysis on XRay images of textile to describe the structures of a textile and compute its permeability. The input is an Xray image of textile, with a size of 350 x 300 x 110. The void space in the image is first segmented into pores and then converted into a network of pore. This network is then used to run a pore network model and the hydraulic permeability of the textile is computed. The complete process (image analysis and permeability computation) takes a few minutes on a Pentium III 1Ghz computer.
Textile sample:
Sample of the image: gray represents solid part and empty part is transparent.  Structure of the void space: green balls represent "pores". blue balls represent interface between pores.  Local pressure in the sample. A gradient of pressure is applied between the lower and the upper face. 
Threshold study:
Permeability/Threshold value

Permeability/Threshold value

Permeability/Threshold value

Corrected Values (*1.3)

Corrected Image (Z/1.3)


Permeability distribution in the sample:
Permeability distribution along X

Permeability distribution along XY

Permeability distribution along XYZ

Sample size: 50*300*115

Sample size: 50*150*115

Sample size: 50*150*50

20022002
Relation Permeability/Porosity:
Permeability / Porosity computed for 50*150*50 voxels
elements

log/log representation of Permeability/Posority

Log/ representation of Permeability/Porosity

The lower point has a porosity of 0.97 and a Permeability of 9e27. Here is the 3D representation of the image used to compute that point:
There are almost no connectivity between the upper and lower face.
Segmentation of the yarn space.
Any comment? idea? 
last update: 06.12.2012 