@TechReport{TR131,
  author =	 "Ines Janusch",
  title =	 "Examination of root development by means
of topological image analysis",
  institution =	 "PRIP, TU Wien",
  number =	 "PRIP-TR-131",
  year =	 "2013",
  url =		 "https://www.prip.tuwien.ac.at/pripfiles/trs/tr131.pdf",
  abstract =	 "The focus of this work is to examine root plant development by means of topological image
analysis. As roots grow and develop they change their shape (for example when branches
are formed). Due to this aspect this application is well suited for a topological analysis.
The aim of the scientific practical is to represent the root images as Reeb graphs. A method
to compute critical points using a height function and to build a Reeb graph based on these
points, is presented. All nodes in the graph are classified according to their type and their
color. There are four different types of nodes in a Reeb graph: minima, maxima, saddle
nodes and regular nodes. When storing color information with the nodes and interpret
the graylevels as levels of elevation, the nodes can be further classified according to their
elevation.",
}