@TechReport{TR083,
  author =	 "Hubert Mara",
  title =	 "Automated {P}rofile {E}xtraction of {A}rchaeological
                  {F}ragments",
  institution =	 "PRIP, TU Wien",
  number =	 "PRIP-TR-083",
  year =	 "2003",
  url =		 "https://www.prip.tuwien.ac.at/pripfiles/trs/tr83.pdf",
  abstract =	 " Thousands of fragments of ceramics are found at
                  archaeological excavation sites. Till today
                  archaeologists have drawn and classified them
                  manually. This method is very time consuming and
                  classification depends on the experiences of the
                  archaeologists. Therefore we developed a system that
                  speeds up this process by using a 3D-scanner for the
                  acquisition and a software that generates a
                  registered 3D-model of the sherd. The features for
                  classification used by archaeologists and a 3D
                  reconstruction of the unbroken vessel are estimated
                  automatically. The registration of different views
                  of the sherd are based on the estimation of the
                  rotational axis by a Hough inspired method. The
                  classification and reconstruction is done by
                  extraction of the longest profile line, which is an
                  intersection of the sherd along the rotational axis
                  of the unbroken vessel. The extracted features for
                  classification are diameters, heights and their
                  relation to each other. These features are estimated
                  by the use of extremal points of the profile
                  line. Results of the system developed are presented
                  for both synthetic and real input data.",
}