Chapter 4. Image Enhancement

  1. Maria Petrou1 and
  2. Panagiota Bosdogianni2

Published Online: 17 OCT 2001

DOI: 10.1002/0470841907.ch4

Image Processing: The Fundamentals

Image Processing: The Fundamentals

How to Cite

Petrou, M. and Bosdogianni, P. (2001) Image Enhancement, in Image Processing: The Fundamentals, John Wiley & Sons, Ltd, Chichester, UK. doi: 10.1002/0470841907.ch4

Author Information

  1. 1

    University of Surrey, Guildford, UK

  2. 2

    Technical University of Crete, Chania, Greece

Publication History

  1. Published Online: 17 OCT 2001

ISBN Information

Print ISBN: 9780471998839

Online ISBN: 9780470841907



  • histogram equalisation;
  • principal component analysis;
  • image sharpening;
  • variable illumination


This chapter covers histogram equalisation and hyperbolisation, local histogram modification, contrast enhancement, principal component analysis, noise removal by filtering (median filtering and Gaussian smoothing), image sharpening, and homomorphic filtering for dealing with spatially variable illumination. Several images are used to demonstrate the various techniques.