A nearest-neighbor approach to relevance feedback in content based image retrieval

  • Authors:
  • Giorgio Giacinto

  • Affiliations:
  • University of Cagliari, Cagliari, Italy

  • Venue:
  • Proceedings of the 6th ACM international conference on Image and video retrieval
  • Year:
  • 2007

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Abstract

High retrieval precision in content-based image retrieval can be attained by adopting relevance feedback mechanisms. The main difficulties in exploiting relevance information are i) the gap between user perception of similarity and the similarity computed in the feature space used for the representation of image content, and ii) the availability of few training data (users typically label a few dozen of images). At present, SVM are extensively used to learn from relevance feedback due to their capability of effectively tackling the above difficulties. However, the performances of SVM depend on the tuning of a number of parameters. In this paper a different approach based on the nearest neighbor paradigm is proposed. Each image is ranked according to a relevance score depending on nearest-neighbor distances. This approach is proposed both in low-level feature spaces, and in "dissimilarity spaces", where image are represented in terms of their dissimilarities from the set of relevant images. Reported results show that the proposed approach allows recalling a higher percentage of images with respect to SVM-based techniques.