Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Secondorder characteristics of the edge system of random tessellations and the PPI value of foams
 Methodology and computing in applied probability 18 (2016), Nr.1, S.5979 ISSN: 13875841 (Print) ISSN: 15737713 (Online) 

 Englisch 
 Zeitschriftenaufsatz 
 Fraunhofer ITWM () 
 image analysis; cellular materials; pores per inch; bartlett spectrum 
Abstract
The mean number of pores per inch (PPI) is widely used as a pore size characteristic for foams. Nevertheless, there is still a lack of fast and reliable methods for estimating this quantity. We propose a method for estimating the PPI value based on the Bartlett spectrum of a dark field image of the material. To this end, secondorder properties of the edge systems of random tessellations are investigated in detail. In particular, we study the spectral density of the random length measure of the edges. It turns out that the location of its first local maximum is proportional to the PPI value. To determine the factor of proportionality, several random tessellation models as well as examples of real foams are investigated. To mimic the image acquisition process, 2D sections and projections of 3D tessellations are considered.