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Image enhancement using Exposure based Sub Image Histogram Equalization
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DOI：10.1016/j.patrec.2013.08.024.png)
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Abstract
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This paper presents a novel Exposure based Sub-Image Histogram Equalization (ESIHE) method for contrast enhancement for low exposure gray scale image. Exposure thresholds are computed to divide the original image into sub-images of different intensity levels. The histogram is also clipped using a threshold value as an average number of gray level occurrences to control enhancement rate. The individual histogram of sub images is equalized independently and finally all sub images are integrated into one complete image for analysis. The simulation results show that ESIHE outperforms other conventional Histogram Equalization (HE) methods in terms of image visual quality, entropy preservation and better contrast enhancement. (C) 2013 Elsevier B.V. All rights reserved.
Keywords:
Histogram equalization
Image information content
Image exposure
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