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Journal of Ocean University of China

, Volume 16, Issue 5, pp 757–765 | Cite as

Underwater image enhancement based on the dark channel prior and attenuation compensation

  • Qingwen Guo
  • Lulu Xue
  • Ruichun Tang
  • Lingrui Guo
Article

Abstract

Aimed at the two problems of underwater imaging, fog effect and color cast, an Improved Segmentation Dark Channel Prior (ISDCP) defogging method is proposed to solve the fog effects caused by physical properties of water. Due to mass refraction of light in the process of underwater imaging, fog effects would lead to image blurring. And color cast is closely related to different degree of attenuation while light with different wavelengths is traveling in water. The proposed method here integrates the ISDCP and quantitative histogram stretching techniques into the image enhancement procedure. Firstly, the threshold value is set during the refinement process of the transmission maps to identify the original mismatching, and to conduct the differentiated defogging process further. Secondly, a method of judging the propagating distance of light is adopted to get the attenuation degree of energy during the propagation underwater. Finally, the image histogram is stretched quantitatively in Red-Green-Blue channel respectively according to the degree of attenuation in each color channel. The proposed method ISDCP can reduce the computational complexity and improve the efficiency in terms of defogging effect to meet the real-time requirements. Qualitative and quantitative comparison for several different underwater scenes reveals that the proposed method can significantly improve the visibility compared with previous methods.

Key words

dark channel image defogging color cast histogram stretching 

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Notes

Acknowledgement

This work is supported by the National Natural Science Foundation of China (No. 61401413).

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Copyright information

© Science Press, Ocean University of China and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Qingwen Guo
    • 1
  • Lulu Xue
    • 1
  • Ruichun Tang
    • 1
  • Lingrui Guo
    • 2
  1. 1.College of Information Science and EngineeringOcean University of ChinaQingdaoP. R. China
  2. 2.College of Oceanic and Atmospheric SciencesOcean University of ChinaQingdaoP. R. China

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