Turbidity Underwater Image Restoration Using Spectral Properties and Light Compensation

Huimin LU  Yujie LI  Shota NAKASHIMA  Seiichi SERIKAWA  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E99-D   No.1   pp.219-227
Publication Date: 2016/01/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2014EDP7405
Type of Manuscript: PAPER
Category: Image Processing and Video Processing
Keyword: 
underwater image enhancement,  wavelength compensation,  guided filter,  

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Summary: 
Absorption, scattering, and color distortion are three major issues in underwater optical imaging. Light rays traveling through water are scattered and absorbed according to their wavelength. Scattering is caused by large suspended particles that degrade underwater optical images. Color distortion occurs because different wavelengths are attenuated to different degrees in water; consequently, images of ambient underwater environments are dominated by a bluish tone. In the present paper, we propose a novel underwater imaging model that compensates for the attenuation discrepancy along the propagation path. In addition, we develop a fast weighted guided normalized convolution domain filtering algorithm for enhancing underwater optical images. The enhanced images are characterized by a reduced noise level, better exposure in dark regions, and improved global contrast, by which the finest details and edges are enhanced significantly.