Journal ArticleDOI
Naturalness Preserved Enhancement Algorithm for Non-Uniform Illumination Images
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TLDR
Experimental results demonstrate that the proposed enhancement algorithm can not only enhance the details but also preserve the naturalness for non-uniform illumination images.Abstract:
Image enhancement plays an important role in image processing and analysis. Among various enhancement algorithms, Retinex-based algorithms can efficiently enhance details and have been widely adopted. Since Retinex-based algorithms regard illumination removal as a default preference and fail to limit the range of reflectance, the naturalness of non-uniform illumination images cannot be effectively preserved. However, naturalness is essential for image enhancement to achieve pleasing perceptual quality. In order to preserve naturalness while enhancing details, we propose an enhancement algorithm for non-uniform illumination images. In general, this paper makes the following three major contributions. First, a lightness-order-error measure is proposed to access naturalness preservation objectively. Second, a bright-pass filter is proposed to decompose an image into reflectance and illumination, which, respectively, determine the details and the naturalness of the image. Third, we propose a bi-log transformation, which is utilized to map the illumination to make a balance between details and naturalness. Experimental results demonstrate that the proposed algorithm can not only enhance the details but also preserve the naturalness for non-uniform illumination images.read more
Citations
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Night Time Image Enhancement by Improved Nonlinear Model
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Retinex Image Enhancement Based on Sequential Decomposition With a Plug-and-Play Framework
TL;DR: A plug-and- play framework based on the Retinex theory for simultaneously image enhancement and noise removal and a convolutional neural network-based (CNN-based) denoiser is developed into this framework to generate a reflectance component.
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Brightness and Contrast Enhancement Method for Color Images Via Pairing Adaptive Gamma Correction and Histogram Equalization
TL;DR: In this article , an adaptive gamma generator is proposed to adaptively calculate gamma parameters in accordance with dark, medium, or bright image conditions, and the computed gamma parameters are used to propose a cumulative distribution function that produces an optimized curve for illumination values.
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Effective method for low-light image enhancement based on the JND and OCTM models.
TL;DR: Zhang et al. as mentioned in this paper proposed an effective method for low-light image enhancement based on the just-noticeable-difference (JND) and the optimal contrast-tone mapping (OCTM) models.
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A Structure Preservation and Denoising Low-Light Enhancement Model via Coefficient of Variation
TL;DR: SPDLEM as mentioned in this paper uses the coefficient of variation to process the original low-light image, which is used to obtain the enhanced illumination gradient reference map, and then combines the above two constraint terms with the Retinex theory, which contains the denoising regular term.
References
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Journal ArticleDOI
Lightness and Retinex Theory
Edwin H Land,John J. McCann +1 more
TL;DR: The mathematics of a lightness scheme that generates lightness numbers, the biologic correlate of reflectance, independent of the flux from objects is described.
Journal ArticleDOI
A multiscale retinex for bridging the gap between color images and the human observation of scenes
TL;DR: This paper extends a previously designed single-scale center/surround retinex to a multiscale version that achieves simultaneous dynamic range compression/color consistency/lightness rendition and defines a method of color restoration that corrects for this deficiency at the cost of a modest dilution in color consistency.
Book
Handbook of Image and Video Processing
TL;DR: The Handbook of Image and Video Processing contains a comprehensive and highly accessible presentation of all essential mathematics, techniques, and algorithms for every type of image and video processing used by scientists and engineers.
Journal ArticleDOI
Properties and performance of a center/surround retinex
TL;DR: A practical implementation of the retinex is defined without particular concern for its validity as a model for human lightness and color perception, and the trade-off between rendition and dynamic range compression that is governed by the surround space constant is described.
Journal ArticleDOI
Realization of the Contrast Limited Adaptive Histogram Equalization (CLAHE) for Real-Time Image Enhancement
TL;DR: A system level realization of CLAHE is proposed, which is suitable for VLSI or FPGA implementation and the goal for this realization is to minimize the latency without sacrificing precision.
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