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Journal of Electronic Imaging

Image contrast enhancement based on the generalized histogram
Author(s): Byoung-Woo Yoon; Woo-Jin Song
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Paper Abstract

We present an adaptive contrast enhancement method based on the generalized histogram, which is obtained by relaxing the restriction of using the integer count. For each pixel, the integer count 1 allocated to a pixel is split into the fractional count and the remainder count. The generalized histogram is generated by accumulating the fractional count for each intensity level and distributing the remainder count uniformly throughout the intensity levels. The intensity mapping function, which determines the contrast gain for each intensity level, is derived from the generalized histogram. Since only the fractional part of the count allocated to each pixel is used for increasing the contrast gain of its intensity level, the amount of contrast enhancement is adjusted by varying the fractional count according to regional characteristics. The proposed scheme produces visually more pleasing results than the conventional histogram equalization.

Paper Details

Date Published: 1 July 2007
PDF: 8 pages
J. Electron. Imag. 16(3) 033005 doi: 10.1117/1.2775482
Published in: Journal of Electronic Imaging Volume 16, Issue 3
Show Author Affiliations
Byoung-Woo Yoon, Pohang Univ. of Science and Technology (South Korea)
Woo-Jin Song, Pohang Univ. of Science and Technology (South Korea)

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