Time series case based reasoning for image categorisation

  • Authors:
  • Ashraf Elsayed;Mohd Hanafi Ahmad Hijazi;Frans Coenen;Marta García-Fiñana;Vanessa Sluming;Yalin Zheng

  • Affiliations:
  • Department of Computer Science, University of Liverpool, Liverpool, UK;Department of Computer Science, University of Liverpool, Liverpool, UK;Department of Computer Science, University of Liverpool, Liverpool, UK;Centre for Medical Statistics and Health Evaluation, University of Liverpool, Liverpool, UK;School of Health Sciences, University of Liverpool, Liverpool, UK;Department of Eye and Vision Science, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool, UK

  • Venue:
  • ICCBR'11 Proceedings of the 19th international conference on Case-Based Reasoning Research and Development
  • Year:
  • 2011

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Abstract

This paper describes an approach to Case Based Reasoning (CBR) for image categorisation. The technique is founded on a time series analysis mechanism whereby images are represented as time series (curves) and compared using time series similarity techniques. There are a number of ways in which images can be represented as time series, this paper explores two. The first considers the entire image whereby the image is represented as a sequence of histograms. The second considers a particular feature (region of interest) contained across an image collection, which can then be represented as a time series. The proposed techniques then use dynamic time warping to compare image curves contained in a case base with that representing a new image example. The focus for the work described is two medical applications: (i) retinal image screening for Age-related Macular Degeneration (AMD) and (ii) the classification of Magnetic Resonance Imaging (MRI) brain scans according to the nature of the corpus callosum, a particular tissue feature that appears in such images. The proposed technique is described in detail together with a full evaluation in terms of the two applications.