Journal ArticleDOI
Image contrast enhancement with brightness preservation using an optimal gamma correction and weighted sum approach
G. Jiang,Chin Yeow Wong,S. C. F. Lin,M. A. Rahman,T.R. Ren,Ngaiming Kwok,Haiyan Shi,Ying-Hao Yu,Tonghai Wu +8 more
TLDR
The non-linear gamma correction method is adopted to enhance the contrast, while a weighted sum approach is employed for brightness preservation, and results have shown that the proposed method outperforms currently available methods in contrast to enhancement and brightness preservation.Abstract:
The enhancement of image contrast and preservation of image brightness are two important but conflicting objectives in image restoration. Previous attempts based on linear histogram equalization had achieved contrast enhancement, but exact preservation of brightness was not accomplished. A new perspective is taken here to provide balanced performance of contrast enhancement and brightness preservation simultaneously by casting the quest of such solution to an optimization problem. Specifically, the non-linear gamma correction method is adopted to enhance the contrast, while a weighted sum approach is employed for brightness preservation. In addition, the efficient golden search algorithm is exploited to determine the required optimal parameters to produce the enhanced images. Experiments are conducted on natural colour images captured under various indoor, outdoor and illumination conditions. Results have shown that the proposed method outperforms currently available methods in contrast to enhancement and...read more
Citations
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Journal ArticleDOI
Contrast enhancement via texture region based histogram equalization
TL;DR: The novel idea presented in this paper is to suppress the impact of pixels in non-textured areas and to exploit texture features for the computation of histogram in the process of HE.
Journal ArticleDOI
Image contrast and color enhancement using adaptive gamma correction and histogram equalization
TL;DR: An effective image contrast enhancement method called an Adaptive Gamma Correction with Weighted Histogram Distribution (AGCWHD) method is proposed to improve contrast while preserving natural color and richer details in images.
Journal ArticleDOI
A Comprehensive Review of Computational Dehazing Techniques
Dilbag Singh,Vijay Kumar +1 more
TL;DR: This paper carries out a comprehensive review of dehazing techniques to show that these could be effectively applied in real-life practice and encourages the researchers to use these techniques for removal of haze from hazy images.
Journal ArticleDOI
Fuzzy dissimilarity color histogram equalization for contrast enhancement and color correction
TL;DR: An efficient method called Fuzzy Dissimilarity Adaptive Histogram Equalization with Gamma Correction (FDAHE-GC) algorithm is proposed, obtained from the neighborhood characteristics of an intensity, which is applied to the intensity value of HSI space to improve visual appearance of an image.
Journal ArticleDOI
Low-dose CT image reconstruction using gain intervention-based dictionary learning
TL;DR: Computed tomography approach is extensively utilized in clinical diagnoses, however, X-ray residue in human body may introduce somatic damage such as cancer.
References
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An introduction to optimization
TL;DR: This review discusses mathematics, linear programming, and set--Constrained and Unconstrained Optimization, as well as methods of Proof and Some Notation, and problems with Equality Constraints.
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Digital Image Processing 3rd Edition
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Journal ArticleDOI
Contrast enhancement using brightness preserving bi-histogram equalization
TL;DR: It is shown mathematically that the proposed algorithm preserves the mean brightness of a given image significantly well compared to typical histogram equalization while enhancing the contrast and, thus, provides a natural enhancement that can be utilized in consumer electronic products.
Journal ArticleDOI
Image enhancement based on equal area dualistic sub-image histogram equalization method
Yu Wang,Qian Chen,Baeomin Zhang +2 more
TL;DR: The simulation results indicate that the algorithm can not only enhance the image information effectively but also preserve the original image luminance well enough to make it possible to be used in a video system directly.
Journal ArticleDOI
Bi-histogram equalization with a plateau limit for digital image enhancement
TL;DR: This paper presents bi-histogram equalization with a plateau level (BHEPL) as one of the options for the system that requires a short processing time image enhancement, and shows better enhancement results as compared with some multi-sections mean brightness preserving histograms equalization methods.
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