Abstract
Images captured underwater usually suffer from color distortion, detail blurring, low contrast, and a bluish or greenish tone due to light scattering and absorption in the underwater medium, which in turn the visibility is adversely affected by these factors seriously. Over the last decades, various image restoration and enhancement methods have been developed by many researchers to improve the quality (visibility and highlight richer details) of underwater images. This paper introduces the overview of state-of-the-art underwater image restoration and enhancement techniques and classifies the approaches in two categories: image restoration (physical-based model) and image enhancement (nonphysical-based model). Furthermore, the classification of these two methods is elaborated. Then, the typical underwater image restoration and enhancement methods are discussed in detail, as well as a comprehensive study and fair evaluation of the methods is carried out from both qualitative and quantitative perspectives. Finally, the research process of underwater image restoration and enhancement is summarized and the suggestions for future research are prospected.
Highlights
The exploitation and utilization of rich mineral resources in the marine environment is beneficial to national defense security and economic construction
Clear underwater images are widely used in the fields of underwater optical imaging (UOI) [1]–[3], underwater detection [4]–[7], underwater target tracking [8], marine biology research [9], marine surveillance [10], and underwater environmental protection [11]
1) This paper provides a comprehensive summary of recent advances in underwater image restoration and enhancement
Summary
WEIDONG ZHANG 1, (Student Member, IEEE), LILI DONG 1, (Member, IEEE), XIPENG PAN 2, PEIYU ZOU 1, LI QIN 3, AND WENHAI XU 1.
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