Allan Hanbury (bibtex)
by Physics-based Segmentation of Colour Images in Spherical Coordinates
Abstract:
We present image segmentation and highlight detection algorithms based on the dichromatic reflection model. For image segmentation, we use the model prediction that objects of a certain colour produce lines (the matte lines) radiating away from the origin of the RGB colour space. These lines therefore show up as peaks in a 2-dimensional histogram of the angular coordinates of a spherical polar coordinate representation of the RGB space. An algorithm for automatically locating these peaks is suggested. When the matte line locations are known, one can define cylindrical polar coordinate systems having their $z$-axes centred on the matte lines. We suggest a Hough-based algorithm for the detection of highlight lines in 2D-histograms of the $\rho$ and $z$ coordinates of the cylindrical polar coordinate system. Examples of the results of applying these algorithms are given.
Reference:
Allan Hanbury (Physics-based Segmentation of Colour Images in Spherical Coordinates), Technical report, PRIP, TU Wien, 2003.
Bibtex Entry:
@TechReport{TR084,
  author =	 "Physics-based {S}egmentation of {C}olour {I}mages in
                  {S}pherical {C}oordinates",
  title =	 "Allan Hanbury",
  institution =	 "PRIP, TU Wien",
  number =	 "PRIP-TR-084",
  year =	 "2003",
  url =		 "ftp://ftp.prip.tuwien.ac.at/pub/publications/trs/tr84.pdf",
  abstract =	 " We present image segmentation and highlight
                  detection algorithms based on the dichromatic
                  reflection model. For image segmentation, we use the
                  model prediction that objects of a certain colour
                  produce lines (the matte lines) radiating away from
                  the origin of the RGB colour space. These lines
                  therefore show up as peaks in a 2-dimensional
                  histogram of the angular coordinates of a spherical
                  polar coordinate representation of the RGB space. An
                  algorithm for automatically locating these peaks is
                  suggested. When the matte line locations are known,
                  one can define cylindrical polar coordinate systems
                  having their $z$-axes centred on the matte lines. We
                  suggest a Hough-based algorithm for the detection of
                  highlight lines in 2D-histograms of the $\rho$ and
                  $z$ coordinates of the cylindrical polar coordinate
                  system. Examples of the results of applying these
                  algorithms are given.",
}
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