A dynamic histogram equalization for image contrast enhancement

M. Abdullah Al Wadud, Md Hasanul Kabir, M. Ali Akber Dewan, Oksam Chae

Research output: Contribution to journalJournal Articlepeer-review

822 Citations (Scopus)


In this paper, a smart contrast enhancement technique based on conventional histogram equalization (HE) algorithm is proposed. This Dynamic Histogram Equalization (DHE) technique takes control over the effect of traditional HE so that it performs the enhancement of an image without making any loss of details in it. DHE partitions the image histogram based on local minima and assigns specific gray level ranges for each partition before equalizing them separately. These partitions further go though a repartitioning test to ensure the absence of any dominating portions. This method outperforms other present approaches by enhancing the contrast well without introducing severe side effects, such as washed out appearance, checkerboard effects etc., or undesirable artifacts.

Original languageEnglish
Pages (from-to)593-600
Number of pages8
JournalIEEE Transactions on Consumer Electronics
Issue number2
Publication statusPublished - May 2007


  • Contrast enhancement
  • Equalization
  • Histogram partition
  • Normal distribution


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