Journal of Xidian University ›› 2022, Vol. 49 ›› Issue (3): 137-146.doi: 10.19665/j.issn1001-2400.2022.03.016

• Computer Science and Technology & Artificial Intelligence • Previous Articles     Next Articles

Algorithm for clarification of the underwater image combining saliency information

WANG Zhaoyu(),GUO Jichang(),WANG Tianbao(),ZHENG Sida(),ZHANG Yi()   

  1. School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China
  • Received:2021-01-31 Revised:2021-12-08 Online:2022-06-20 Published:2022-07-04
  • Contact: Jichang GUO E-mail:wangzhaoyuisjoy@tju.edu.cn;jcguo@tju.edu.cn;wangtianbao@tju.edu.cn;zhengsida@tju.edu.cn;zhangyi123@tju.edu.cn

Abstract:

Due to the selective absorption of light by water and the scattering effect of particles in water,underwater images usually have some defects,such as color distortion,low contrast and blurred details.Considering the color distortion and low contrast in the underwater images,an underwater image clarification algorithm combining saliency information is proposed.First,the background light is estimated by a hierarchical search algorithm based on quadtree segmentation.Second,in combination with the underwater imaging model,the perliminary clarification of the underwater image is performed.Furthermore,the superpixels are achieved via the Simple Linear Iterative Clutering algorithm.The global distance matrixes are constructed according to the feature similarity of each superpixel and the boundary background clusters.Then,the global distance matrixes are integrated to generate a saliency map by the Multi-Layer Cellular Automata.Finally,based on the saliency map,the color of underwater images is corrected in the Lab color space.In the experiment,1500 underwater images in UFO-120 dataset are selected as research objects.The algorithm has a significant improvement in the Patch-based Contrast Quality Index,Entropy,Underwater Image Sharpness Measure,Underwater Image Contrast Measure and subjective color restoration.Extensive experiments show that the proposed algorithm outperforms state-of-the-art methods in color correction and contrast enhancement of underwater images.

Key words: underwater image clarification, color correction, image saliency, k-means clustering

CLC Number: 

  • TP391.41