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UUV near sea surface visible light image defogging method

A visible light and image technology, applied in the field of optical vision imaging

Active Publication Date: 2017-10-13
HARBIN ENG UNIV
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Problems solved by technology

However, median filtering is not a good edge-preserving filtering method

Method used

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  • UUV near sea surface visible light image defogging method
  • UUV near sea surface visible light image defogging method
  • UUV near sea surface visible light image defogging method

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Embodiment Construction

[0036] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following describes the present invention in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Such as figure 1 As shown, a UUV near-sea visible light image defogging method includes the following steps:

[0038] 1. Use VS2010 and OPENCV language programming to input and display the UUV near sea surface visible light detection image, marked as I(x), the visible light image is as figure 2 Shown. Take the minimum value of the three color channels for I(x) and record

[0039]

[0040] Image M(x) such as image 3 Shown.

[0041] 2. Using the improved method of M(x) and quadtree subdivision method to obtain global atmospheric light, the steps include:

[0042] (1) Divide the picture into four rectangular areas.

[0043] (2) Calculate the pixel average value and variance of each area, and the average pixel value minus the variance is r...

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Abstract

The invention provides a UUV near sea surface visible light image defogging method. According to the method, (1), an original foggy image is acquired, and the minimum value of three color channels is solved and is recorded as M(x); (2), an improved method of M(x) and a quadtree segmentation method is utilized to solve global atmosphere light; (3), adaptive surface fuzziness of the M(x) is carried out; (4), an atmosphere scattering function is solved; and (5), a fog imaging physical model is utilized to solve a no-fog image which is outputted. According to the method, adaptive surface fuzziness of the minimum value image of the three color channels is carried out, each pixel has a respective convolution matrix, edges of a target object can be excellently kept, subsequent target identification, positioning and tracking are facilitated, moreover, for solving a problem of a local dark phenomenon after filtering, the global atmosphere light is utilized to roughly divide the image into a dark area and a bright area, and different radiuses are utilized for fuzzy processing. The method is advantaged in that the relatively good defogging effect is realized, and a sky halation phenomenon can be overcome.

Description

Technical field [0001] The invention relates to an optical vision imaging method, in particular to a defogging method for UUV visible light images on the offshore surface. Background technique [0002] China has a long coastline and complicated maritime weather conditions. Ship collision accidents caused by sea fog are not uncommon. When light propagates in the atmospheric medium, it is refracted or reflected by suspended particles, resulting in a large number of features in the video image captured by a camera mounted on a maritime buoy or UUV being masked, the contrast is reduced, and the edge details are blurred, which can easily cause misjudgment of the image content. Thereby affecting the subsequent target positioning, recognition and tracking. Therefore, the defogging processing of marine light visual images is a practical and challenging problem. [0003] The document "Single Image Haze Removal Using Dark Channel Prior" (Proceedings of IEEE CVPR.Miami, USA: IEEE Computer S...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T7/11
CPCG06T7/11G06T2207/30181G06T5/73
Inventor 管凤旭周丽萍严浙平张宏瀚周佳加车浩刘怀东
Owner HARBIN ENG UNIV
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