Centroidal Voronoi Tessellation Algorithms for Image Compression, Segmentation, and Multichannel Restoration

  • Authors:
  • Qiang Du;Max Gunzburger;Lili Ju;Xiaoqiang Wang

  • Affiliations:
  • Department of Mathematics, Penn State University, University Park, USA 16802;School of Computational Science, Florida State University, Tallahassee, USA 32306-4120;Aff3 Aff4;Aff1 Aff5

  • Venue:
  • Journal of Mathematical Imaging and Vision
  • Year:
  • 2006

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Abstract

Centroidal Voronoi tessellations (CVT's) are special Voronoi tessellations for which the generators of the tessellation are also the centers of mass (or means) of the Voronoi cells or clusters. CVT's have been found to be useful in many disparate and diverse settings. In this paper, CVT-based algorithms are developed for image compression, image segmenation, and multichannel image restoration applications. In the image processing context and in its simplest form, the CVT-based methodology reduces to the well-known k-means clustering technique. However, by viewing the latter within the CVT context, very useful generalizations and improvements can be easily made. Several such generalizations are exploited in this paper including the incorporation of cluster dependent weights, the incorporation of averaging techniques to treat noisy images, extensions to treat multichannel data, and combinations of the aforementioned. In each case, examples are provided to illustrate the efficiency, flexibility, and effectiveness of CVT-based image processing methodologies.