期刊
COMPUTERS & ELECTRICAL ENGINEERING
卷 66, 期 -, 页码 569-582出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.compeleceng.2017.09.012
关键词
Image enhancement; Contrast enhancement; Adaptive gamma correction; Negative image; CDF truncation; Dimmed image; Bright image
类别
资金
- National Natural Science Foundation of China [61401408, 61772539, 61402484, 61673052]
As an efficient image contrast enhancement (CE) tool, adaptive gamma correction (AGC) was previously proposed by relating gamma parameter with cumulative distribution function (CDF) of the pixel gray levels within an image. ACG deals well with most dimmed images, but fails for globally bright images and the dimmed images with local bright regions. However, such two categories of brightness-distorted images are universal in real scenarios, such as those incurred by improper exposure and white objects. In order to attenuate such deficiencies, in this paper we propose an improved AGC technique. The novel strategy of negative images is used to realize CE of the bright images, and the gamma correction modulated by truncated CDF is employed to enhance the dimmed ones. As such, local over enhancement and structure distortion can be alleviated effectively. Extensive qualitative and quantitative experimental results show that our proposed method yields consistently good CE results. (C) 2017 Elsevier Ltd. All rights reserved.
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