The object of this work is to use image analysis on X-Ray images of textile to describe the structures of a textile and compute its permeability. The input is an X-ray 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 X-Y	Permeability distribution along X-Y-Z
Sample size: 50*300*115	Sample size: 50*150*115	Sample size: 50*150*50

20-02-2002

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 9e-27. 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.