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Quadri-histogram equalization using cutoff limits based on the size of each histogram with preservation of average brightness

  • Isidro Augusto Brizuela PinedaEmail author
  • Rubén Darío Medina Caballero
  • Juan José Cáceres Silva
  • Julio César Mello Román
  • José Luis Vázquez Noguera
Original Paper
  • 15 Downloads

Abstract

The traditional methods of equalization based on the histogram increase the contrast of the images, at the expense of great changes in the average brightness of the image and loss of information, producing images with an unnatural appearance. Consequently, we desire to develop a technique of contrast enhancement that preserves the average brightness of the image and thus avoids the saturation levels that cause the loss of information. We present the quadri-histogram equalization with limited contrast, an algorithm that divides the histogram into four subhistograms, which are equalized independently with bounds on the contrast improvement. These bounds are designed to constrain the distortion on the image, and our experimental results show that the proposed method preserves both the average brightness and the details of the images, compared to several methods found in the literature.

Keywords

Contrast enhancement Loss of information Limited contrast Average brightness Equalization 

Notes

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  • Isidro Augusto Brizuela Pineda
    • 1
    Email author
  • Rubén Darío Medina Caballero
    • 1
  • Juan José Cáceres Silva
    • 2
  • Julio César Mello Román
    • 1
  • José Luis Vázquez Noguera
    • 1
  1. 1.Polytechnic SchoolNational University of AsuncionSan LorenzoParaguay
  2. 2.Department of Computer ScienceRoyal Holloway, University of LondonEghamUK

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