Underwater image sharpening enhancement method

A technology for underwater image clarity, applied in the field of digital image processing, to achieve scientific and reliable principles, improve visibility, and enhance clarity

Active Publication Date: 2020-07-28
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the weaknesses of the prior art, to provide a variational frame-based underwater image clarity enhancement method, which combines the color correction strategy and the contrast enhancement strategy to perform the underwater image clarity process, Among them, the color correction strategy is used to eliminate the attenuation difference introduced by the propagation properties of light in the medium or artificial lighting, and improve the color cast problem. The contrast enhancement strategy is used to improve the contrast to eliminate the foggy appearance of the image and expose more scenes. detail

Method used

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Embodiment 1

[0050] The specific process of clearing and enhancing the underwater image in this embodiment is as follows:

[0051] (1) Input the original underwater image u 0 ;

[0052] (2) Construct a clear energy equation based on the variational framework:

[0053]

[0054] among them,

[0055]

[0056] Where I is the enhancement result, and the iteration is initially initialized to the unprocessed original image; a and b are scale parameters, used to control the weight of the two items; Ω is the entire image area; c∈{R,G,B}, Refers to the color channel of the image; U is the color correction image, D is the distance weighted average function, S is the weight function, and μ is the slope parameter; the first term in the energy equation is the data item to improve the color performance of the final output, The second term is the rule term, which is used to measure the contrast of the image. This term is stretched in the iterative process of minimizing the energy of the equation to increase the...

Embodiment 2

[0085] This embodiment adopts the technical scheme of embodiment 1 and other existing methods to sharpen and enhance the underwater image of the underwater greening scene, and the result is as follows image 3 As shown, (a) is the original underwater image, (b) is the output result of the ACE algorithm, (c) is the output result of the WCID algorithm, (d) is the output result of the UDCP, (e) is the output result of the IBLA algorithm, (f ) Is the experimental result of this embodiment.

Embodiment 3

[0087] This embodiment adopts the technical solution of embodiment 1 and other existing methods to sharpen and enhance the underwater image of the underwater bluening scene, and the result is as follows Figure 4 As shown, (a) is the original underwater image, (b) is the output result of the ACE algorithm, (c) is the output result of the WCID algorithm, (d) is the output result of the UDCP, (e) is the output result of the IBLA algorithm, (f ) Is the experimental result of this embodiment.

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Abstract

The invention belongs to the technical field of digital image processing, and relates to an underwater image sharpening enhancement method. A color correction strategy and a contrast enhancement strategy are combined to execute a sharpening process of an underwater image, the color correction strategy is used for eliminating attenuation difference caused by propagation attributes of light in a medium or artificial illumination and improving the color cast problem, and the contrast enhancement strategy is used for improving the contrast so as to eliminate the atomized appearance of the image and expose more scene details. The method is simple, the principle is scientific and reliable, the detectable image structure characteristics can be effectively increased, the underwater image definition is enhanced, the variational framework has good coupling, and the method can be combined with other technologies or used as a preprocessing step to be widely applied to the field of computer vision.

Description

Technical field: [0001] The invention belongs to the technical field of digital image processing, and relates to an underwater image sharpening and enhancing method, in particular to a variational method-based underwater image sharpening technology. Background technique: [0002] For a long time, images acquired under water often have many degradation problems, such as fogging, blue-green cast, blurry details, etc. This makes the original underwater images have low visibility and poor look and feel. The use of digital image processing technology to clarify details and restore their visibility is an effective solution currently available, which has the advantages of low cost and easy implementation. The current clarification technology for underwater images can be divided into two categories: one is the image restoration technology based on the inversion of the physical imaging process, which aims to obtain the real irradiation of the target; the other is the image itself to obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/13
CPCG06T5/003G06T5/007G06T7/13G06T2207/10024G06T2207/20016
Inventor 侯国家杨鑫李鑫杰任腾潘振宽
Owner QINGDAO UNIV
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