Underwater image enhancement method based on anisotropic color channel attenuation difference

A color channel and underwater image technology, applied in the field of image processing, can solve the problems of not considering the difference of color channel attenuation, the enhancement effect is not very good, etc., to achieve the effect of improving brightness and contrast, and enhancing the image

Pending Publication Date: 2022-07-12
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

Although algorithms such as HE and gamma transformation can effectively improve the details of grayscale images, they do not consider the attenuation differences of color channels when correcting, and the enhancement effect is not very good.

Method used

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  • Underwater image enhancement method based on anisotropic color channel attenuation difference
  • Underwater image enhancement method based on anisotropic color channel attenuation difference
  • Underwater image enhancement method based on anisotropic color channel attenuation difference

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Embodiment Construction

[0037] The technical solutions of the present invention are further described below with reference to the accompanying drawings.

[0038] like figure 1 As shown, an underwater image enhancement method based on anisotropic color channel attenuation difference disclosed in the present invention specifically includes the following steps:

[0039] Step 1, normalize the image pixels of the original image, extract three color channels R, G, and B from the original image, and calculate the total pixel value, mean and variance of each color channel respectively;

[0040] (1) Suppose the number of rows and columns of the original image I are m and n, respectively, namely:

[0041] I={(i,j)|1≤i≤m,1≤j≤n}

[0042] (2) Normalize the original image I, that is, normalize the pixel values ​​of the image to the range of [0,1]:

[0043]

[0044] In the formula, a represents the smallest pixel value in the original image, and b represents the largest pixel value in the original image.

[...

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Abstract

The invention discloses an underwater image enhancement method based on anisotropic color channel attenuation difference. The method comprises the following steps: (1) carrying out normalization processing on an original image; obtaining three color channels, and calculating a total pixel value, a mean value and a variance of each color channel; (2) judging whether a color channel meeting conditions exists or not; if a channel meeting the condition exists, the channel is used as a reference image, and a self-adaptive gamma transformation function is adopted to enhance the remaining channels; if two or more channels meeting the conditions exist, randomly selecting one channel as a reference image, and enhancing the remaining channels by adopting an adaptive gamma transformation function; if no channel meeting the condition exists, the channel with the maximum total pixel value is selected as a reference image, and the changed gamma correction formula is adopted to enhance the remaining channels; and (3) combining the reference image and the enhanced image to form a final enhanced image. According to the invention, the brightness and contrast of the underwater image can be effectively improved and enhanced.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an underwater image enhancement method based on anisotropic color channel attenuation differences. Background technique [0002] Affected by the complex underwater environment, underwater images often have problems such as low contrast, blurred details and color distortion, so the enhancement of underwater images has great research significance. When light propagates underwater, it is attenuated by absorption and scattering. Underwater images captured in turbid or deep water exhibit large differences in the degree of attenuation between channels. Although algorithms such as HE and gamma transformation can effectively improve the details of grayscale images, they do not consider the attenuation difference of color channels during correction, and the enhancement effect is not very good. SUMMARY OF THE INVENTION [0003] Purpose of the invention: In view of the above sh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/50G06T7/90
CPCG06T5/007G06T5/50G06T7/90G06T2207/20221Y02A90/30
Inventor 李昌利潘欣欣潘志庚王超周先春蔡创新
Owner NANJING UNIV OF INFORMATION SCI & TECH
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