Adaptive height-modified histogram equalization and chroma correction in YCbCr color space for fast backlight image compensation

Bonghyup Kang, Changwon Jeon, David K. Han, Hanseok Ko

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Automatic exposure controls in commercially available cameras often encounter difficulties in capturing scenes with backlight luminance which dominates the entire image. An Adaptive Height-Modified Histogram Equalization (AHMHE) algorithm is proposed as a compensation technique for backlight images. It simultaneously enhances contrast in both the dark and the bright areas without creating regions of degraded local contrast. Moreover AHMHE is an adaptive algorithm: thus it requires minimal user input, and its reduced computational requirement makes it suitable for real-time application. In addition to AHMHE, a chroma correction technique was applied to chroma components in the YCbCr color space to produce more vivid color images. A series of subjective and index evaluations were conducted to measure the resultant image quality improvements by the AHMHE and the chroma correction algorithms.

Original languageEnglish
Pages (from-to)557-568
Number of pages12
JournalImage and Vision Computing
Volume29
Issue number8
DOIs
Publication statusPublished - 2011 Jul

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Keywords

  • Backlight compensation
  • Contrast enhancement
  • Histogram equalization
  • Image enhancement
  • Saturation

ASJC Scopus subject areas

  • Signal Processing
  • Computer Vision and Pattern Recognition

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