Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Feature Extraction for Content-Based Image Retrieval

  • Raimondo Schettini
  • Gianluigi Ciocca
  • Isabella Gagliardi
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_162

Synonyms

Image indexing

Definition

Feature extraction for content-based image retrieval is the process of automatically computing a compact representation (numerical or alphanumerical) of some attribute of digital images, to be used to derive information about the image contents. It can be seen as a case of dimensionality reduction. A feature, or attribute, can be related to a visual characteristic, but it may also be related to an interpretative response to an image or to a spatial, symbolic, semantic, or emotional characteristic. A feature may relate to a single attribute or be a composite representation of different attributes. Features can be classified as general purpose or domain-dependent. The general purpose features can be used in any context, while the domain-dependent features are designed specifically for a given application. Every feature is intimately tied with the kind of information that it captures. The choice of a particular feature over another depends on the given...

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Recommended Reading

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Raimondo Schettini
    • 1
  • Gianluigi Ciocca
    • 1
  • Isabella Gagliardi
    • 2
  1. 1.University of Milano-BicoccaMilanItaly
  2. 2.National Research Council (CNR)MilanItaly

Section editors and affiliations

  • Jeffrey Xu Yu
    • 1
  1. 1.The Chinese University of Hong KongHong KongChina