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Image Classification Using Spatial Pyramid Coding and Visual Word Reweighting

  • Chunjie Zhang
  • Jing Liu
  • Jinqiao Wang
  • Qi Tian
  • Changsheng Xu
  • Hanqing Lu
  • Songde Ma
Part of the Lecture Notes in Computer Science book series (LNCS, volume 6494)

Abstract

The ignorance on spatial information and semantics of visual words becomes main obstacles in the bag-of-visual-words (BoW) method for image classification. To address the obstacles, we present an improved BoW representation using spatial pyramid coding (SPC) and visual word reweighting. In SPC procedure, we adopt the sparse coding technique to encode visual features with the spatial constraint. Visual features from the same spatial sub-region of images are collected to generate the visual vocabulary. Additionally, a relaxed but simple solution for semantic embedding into visual words is proposed. We relax the semantic embedding from ideal semantic correspondence to naive semantic purity of visual words, and reweight each visual word according to its semantic purity. Higher weights are given to semantically distinctive visual words, and lower weights to semantically general ones. Experiments on a public dataset demonstrate the effectiveness of the proposed method.

Keywords

spatial pyramid coding bag-of-visual-words (BoW) reweighting image classification 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Chunjie Zhang
    • 1
  • Jing Liu
    • 1
  • Jinqiao Wang
    • 1
  • Qi Tian
    • 2
  • Changsheng Xu
    • 1
  • Hanqing Lu
    • 1
  • Songde Ma
    • 1
  1. 1.National Laboratory of Pattern Recognition, Institute of AutomationChinese Academy of SciencesBeijingChina
  2. 2.University of Texas at San AntonioSan Antonio TexasUSA

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