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Method of enhancing underwater image based on Retinex model

An underwater image and model technology, applied in the field of image processing, can solve problems such as high complexity, underexposure, color cast, etc., and achieve natural performance, good visual effect, and low computational complexity

Active Publication Date: 2017-12-22
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
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Problems solved by technology

In general, underwater imaging will encounter three main problems: color cast, blur, underexposure
Fu Xueyang's method works well, but the complexity is too high

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  • Method of enhancing underwater image based on Retinex model
  • Method of enhancing underwater image based on Retinex model
  • Method of enhancing underwater image based on Retinex model

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Embodiment Construction

[0042] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0043] The invention provides an underwater image enhancement method based on the Retinex model for comprehensive color correction and brightness adjustment. First, the underwater image color is corrected by stretching the color contrast, and then the image is converted from the RGB space to the HSV space, and then based on the Retinex model , adjust the brightness of the V channel representing the brightness separately: first decompose the V channel into reflection and illumination parts, initialize the illumination part with the value of the V channel, and then optimize and purify according to the constraints of preserving the structure edge and removing texture details, Then perform gamma correction to obtain the brightness-adjusted V channel, which is merged with the other two channels and convert...

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Abstract

The invention discloses a method of enhancing an underwater image based on a Retinex model, which includes the following steps: correcting the colors of an underwater image; transforming the image from an RGB color space to an HSV color space; decomposing a V color channel into a reflecting part and a lighting part based on a Retinex model; initializing, purifying and correcting the lighting part to get a V channel after brightness adjustment; and combining the V channel with the other two channels, and transforming the image to the RGB space to get a final enhanced image. The method includes a color correction process and a brightness adjustment process. Compared with the existing method, an image processed using the method of the invention has realer colors, more natural performance and a better visual effect, and the method has the advantages of low computational complexity and short processing time.

Description

technical field [0001] The invention belongs to the technical field of image processing, and relates to underwater image enhancement technology, in particular to an underwater image enhancement method based on Retinex model-based comprehensive color correction and brightness adjustment. Background technique [0002] The study of underwater imaging is of great significance to the exploration of marine resources, the study of seabed ecology, and marine military applications. However, the underwater environment is very harsh, because the light is severely absorbed and scattered during the propagation of the medium. Light is reflected in all directions by large suspended particles, which blurs the image. Further, light is absorbed by water resulting in reduced energy, resulting in underexposure and color shift. The reason for the color shift is that different wavelengths have different absorption rates. When reaching a certain depth, the longer wavelength will disappear first...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/90
CPCG06T7/90G06T2207/20172G06T5/77G06T5/90
Inventor 李革张文豪应振强王荣刚王文敏
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL