A Smart System for Low-Light Image Enhancement with Color Constancy and Detail Manipulation in Complex Light Environments

被引:20
作者
Rahman, Ziaur [1 ]
Aamir, Muhammad [1 ]
Pu, Yi-Fei [1 ]
Ullah, Farhan [1 ,2 ]
Dai, Qiang [1 ]
机构
[1] Sichuan Univ, Coll Comp Sci & Technol, Chengdu 610065, Sichuan, Peoples R China
[2] COMSATS Univ Islamabad, Dept Comp Sci, Sahiwal Campus, Islamabad 57000, Pakistan
来源
SYMMETRY-BASEL | 2018年 / 10卷 / 12期
基金
中国国家自然科学基金;
关键词
image enhancement; color constancy; Retinex theory; naturalness preservation; camera response framework; low illumination; ADAPTIVE HISTOGRAM EQUALIZATION; CONTRAST ENHANCEMENT; MULTISCALE RETINEX; WAVELET; FUSION; ALGORITHM;
D O I
10.3390/sym10120718
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Images are an important medium to represent meaningful information. It may be difficult for computer vision techniques and humans to extract valuable information from images with low illumination. Currently, the enhancement of low-quality images is a challenging task in the domain of image processing and computer graphics. Although there are many algorithms for image enhancement, the existing techniques often produce defective results with respect to the portions of the image with intense or normal illumination, and such techniques also inevitably degrade certain visual artifacts of the image. The model use for image enhancement must perform the following tasks: preserving details, improving contrast, color correction, and noise suppression. In this paper, we have proposed a framework based on a camera response and weighted least squares strategies. First, the image exposure is adjusted using brightness transformation to obtain the correct model for the camera response, and an illumination estimation approach is used to extract a ratio map. Then, the proposed model adjusts every pixel according to the calculated exposure map and Retinex theory. Additionally, a dehazing algorithm is used to remove haze and improve the contrast of the image. The color constancy parameters set the true color for images of low to average quality. Finally, a details enhancement approach preserves the naturalness and extracts more details to enhance the visual quality of the image. The experimental evidence and a comparison with several, recent state-of-the-art algorithms demonstrated that our designed framework is effective and can efficiently enhance low-light images.
引用
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页数:15
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