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Multimedia Tools and Applications

, Volume 73, Issue 3, pp 1195–1224 | Cite as

Image classification without segmentation using a hybrid pyramid kernel

  • Wai-Shing Cho
  • Kin-Man LamEmail author
Article

Abstract

Image classification usually requires complicated segmentation to separate foreground objects from the background scene. However, the statistical content of a background scene can actually provide very useful information for classification. In this paper, we propose a new hybrid pyramid kernel which incorporates local features extracted from both dense regular grids and interest points for image classification, without requiring segmentation. Features extracted from dense regular grids can better capture information about the background scene, while interest points detected at corners and edges can better capture information about the salient objects. In our algorithm, these two local features are combined in both the spatial and the feature-space domains, and are organized into pyramid representations. In order to obtain better classification accuracy, we fine-tune the parameters involved in the similarity measure, and we determine discriminative regions by means of relevance feedback. From the experimental results, we observe that our algorithm can achieve a 6.37 % increase in performance as compared to other pyramid-representation-based methods. To evaluate the applicability of the proposed hybrid kernel to large-scale databases, we have performed a cross-dataset experiment and investigated the effect of foreground/background features on each of the kernels. In particular, the proposed hybrid kernel has been proven to satisfy Mercer’s condition and is efficient in measuring the similarity between image features. For instance, the computational complexity of the proposed hybrid kernel is proportional to the number of features.

Keywords

Un-segmented image classification Bag-of-features Spatial-pyramid match Feature-space pyramid representation Hybrid kernel Relevance feedback Point-of-Interest 

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Centre for Signal Processing, Department of Electronic and Information EngineeringThe Hong Kong Polytechnic UniversityHung HomHong Kong

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