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Dark channel prior and variation Retinex-based underwater image enhancement method

A dark channel prior, underwater image technology, applied in the field of underwater image enhancement based on dark channel prior and variational Retinex, can solve the problems of uneven illumination, color degradation, blurred details, etc., to enhance image details, improve Image contrast, the effect of correcting the blue-green cast

Inactive Publication Date: 2018-04-06
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides an underwater image enhancement method based on dark channel prior and variational Retinex, which solves the problems of color degradation, low contrast, fuzzy details, and uneven illumination in underwater images, and improves the quality of underwater degraded images. The visual quality of , as described below:
[0011] Convert the processed image from the RGB color space to the Lab color space, and use the variational Retinex model for the L component to solve the problem of uneven illumination;

Method used

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  • Dark channel prior and variation Retinex-based underwater image enhancement method
  • Dark channel prior and variation Retinex-based underwater image enhancement method
  • Dark channel prior and variation Retinex-based underwater image enhancement method

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Embodiment 1

[0039] The embodiment of the present invention provides an underwater image enhancement method based on dark channel prior and variational Retinex, see figure 1 , the underwater image enhancement method includes the following steps:

[0040] 101: Linearly stretch the original degraded underwater image in the RGB color space based on the mean and variance of each channel to correct the color deviation;

[0041] Wherein, the aforementioned RGB color space is a technical term well known to those skilled in the art, which will not be described in detail in this embodiment of the present invention.

[0042] 102: Apply the dark channel prior theory to remove the "fog" of the image after color cast correction, so as to remove the influence of backscattering and improve the image contrast;

[0043] Wherein, the dark channel prior theory is the technical knowledge known to those skilled in the art, and the embodiment of the present invention does not repeat it here.

[0044] 103: Con...

Embodiment 2

[0049] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and examples, see the following description for details:

[0050] 201: Linear stretch color correction based on mean and variance;

[0051]Among them, the R, G, and B channels of the input degraded underwater color image are separated, and the mean and variance of each channel are calculated respectively, using and represent the mean and variance of each channel, respectively.

[0052] According to the formula (1), the results of each channel after linear stretching are obtained, S CR Represents a color-corrected underwater image.

[0053]

[0054] in, The minimum value after stretching the gray value of the color channel; is the maximum value after stretching the gray value of the color channel; Get the new channel gray value for linear stretching; μ is the dynamic range parameter; S λ The gray value of the color channel of the original image.

[005...

Embodiment 3

[0083] Combine below image 3 and Figure 4 The scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0084] 11 underwater images are used to construct the test sample set. image 3 Some examples of processing results are listed, the left side is the color degraded underwater image, and the right side is the enhanced result image of this method. Compared with the original image, the blue-green tone of the enhanced image is removed, the contrast and detail clarity of the image are significantly improved, and the phenomenon of uneven illumination is effectively solved.

[0085] Figure 4 A comparison chart of the results of this method and the processing results based on the dark channel prior [7] and the Retinex model [2] proposed by Fu Xueyang et al. is listed. The first line is the original underwater image, the second line is the dark channel prior processing result, the third line is the processing result of F...

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Abstract

The invention discloses a dark channel prior and variation Retinex-based underwater image enhancement method. The underwater image enhancement method comprises the following steps of based on the meanvalue and the variance of each channel, linearly stretching on an original degraded underwater image in the RGB color space so as to correct the color cast; subjecting the image after being subjectedto color cast correction to defogging treatment based on the dark channel prior theory, removing the influence of backward scattering, and improving the contrast ratio of the image; converting the processed image from the RGB color space to the lab color space, and solving the uneven illumination problem on an L component by using a variable Retinex model; recombining the enhanced L component with a component a and a component b, and converting the image back to the RGB color space to obtain a final enhanced image. According to the invention, the problems of color degradation, low contrast ratio, fuzzy details and uneven illumination in an underwater image are solved. Meanwhile, the visual quality of underwater degraded images is improved.

Description

technical field [0001] The present invention relates to the field of image processing in the field of computer vision, in particular to an underwater image enhancement method based on dark channel prior and variational Retinex (an image enhancement algorithm known to those skilled in the art). Background technique [0002] Unlike optical imaging on land, the underwater optical imaging environment is particularly complex. This is because underwater imaging is affected by both the absorption and scattering of light by the water body, and the scattering and absorption coefficients are related to the specific underwater imaging environment. According to the classic Jaffe-McGlamery underwater optical imaging model [1] , the underwater image can be regarded as a linear superposition of direct attenuation, forward scattering, and backscattering. Direct attenuation refers to the light that is reflected by the target object without scattering, and the light that is scattered at a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/90
CPCG06T7/90G06T2207/10024G06T5/92G06T5/73
Inventor 徐岩曾祥波孙美双
Owner TIANJIN UNIV
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