A contrast enhancement method using dynamic range separate histogram equalization

In this paper, a contrast enhancement method using dynamic range separate histogram equalization (DRSHE) is proposed. Histogram equalization (HE) method is widely used for contrast enhancement. However, HE is not suitable for consumer electronic products directly because it may cause side-effects su...

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Bibliographic Details
Published in:IEEE transactions on consumer electronics 2008-11, Vol.54 (4), p.1981-1987
Main Authors: Park, Gyu-Hee, Cho, Hwa-Hyun, Choi, Myung-Ryul
Format: Article
Language:English
Subjects:
Brightness
Color
Consumer electronics
Contouring
Contrast Enhancement
Dynamic range
Electronics
Equalization
Flat panel displays
Gray-scale
Histogram Equalization
Histograms
Image coding
Image enhancement
Image processing
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Summary:In this paper, a contrast enhancement method using dynamic range separate histogram equalization (DRSHE) is proposed. Histogram equalization (HE) method is widely used for contrast enhancement. However, HE is not suitable for consumer electronic products directly because it may cause side-effects such as washed out appearance and false contouring due to the significant change in brightness. DRSHE separates the dynamic range of histogram into k parts and resizes the grayscale range based on its area ratio. Then intensities of histogram are uniformly redistributed in resized grayscale range. DRSHE uses weighted average of absolute color difference (WAAD) in order to emphasize the edge of original image and moderate the histogram variation effectively. We introduced a linear adaptive scale factor to reduce excessive changes in brightness. The experimental results show that DRSHE suppresses unintended changes in brightness and preserves naturalness of the original image compared with conventional methods.
ISSN:0098-3063
1558-4127
DOI:10.1109/TCE.2008.4711262