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  • Research Article
  • Open Access

Multiband Segmentation of a Spectroscopic Line Data Cube: Application to the HI Data Cube of the Spiral Galaxy NGC 4254

  • 1Email author,
  • 1,
  • 2 and
  • 2
EURASIP Journal on Advances in Signal Processing20052005:921039

  • Received: 28 May 2004
  • Published:


A new method for the multiband segmentation of a spectroscopic line data cube is presented. This method is intended to help astronomers to handle complex spectroscopic line data cubes where the inspection of the channel and moment maps is difficult. Due to the Hughes phenomenon, the number of input images for the segmentation process is limited. Therefore, the spectrum of each pixel is fitted with a mixture of 6 Gaussians with fixed mean values and variances. The maps of the Gaussian weights are the input for a Markovian segmentation algorithm. The final segmentation map contains classes of pixels with similar spectral line profiles. The application of our method to the HI data cube of the Virgo spiral galaxy NGC 4254 shows that kinematically interesting regions can be detected and masked by our method.


  • spectroscopic data cube reduction
  • Gaussian mixture model
  • hierarchical hidden Markov model
  • multicomponent image
  • Bayesian segmentation
  • HI 21 cm line spiral galaxy NGC 4254

Authors’ Affiliations

Laboratoire des Sciences de l'Image, de l'Informatique et de la Télédétection (LSIIT) UMR 7005, Université Louis Pasteur (Strasbourg 1), Boulevard Sébastien Brant, B.P. 10413, Illkirch, Cedex, 67412, France
Centre de Données Astronomiques de Strasbourg (CDS), UMR 7550, Observatoire Astronomique de Strasbourg, 11 rue de l'Université, Strasbourg, 67000, France


© Flitti et al. 2005