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Underwater image processing method based on Retinex and high dynamic range image gradient compression

A high dynamic range, underwater image technology, applied in image data processing, image analysis, image communication, etc., can solve problems such as color distortion, and achieve the effect of improving the effect of color shift and suppressing the halo effect.

Inactive Publication Date: 2021-03-26
DALIAN OCEAN UNIV
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Problems solved by technology

The HDR compression algorithm has attracted the attention and in-depth research of many researchers because of its superiority in contrast reproduction and halo removal. However, the existing HDR compression algorithm also compresses the color gamut during the high dynamic range image compression process. prone to color distortion

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  • Underwater image processing method based on Retinex and high dynamic range image gradient compression
  • Underwater image processing method based on Retinex and high dynamic range image gradient compression
  • Underwater image processing method based on Retinex and high dynamic range image gradient compression

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Embodiment Construction

[0029] A kind of underwater image processing method based on Retinex and high dynamic range image gradient compression of the present invention, carries out according to following steps successively:

[0030] Step 1: Input an underwater image;

[0031] Step 2: Perform multi-scale Retinex algorithm (MSR) processing on the underwater image, which can attenuate the low-frequency component of the illumination component in the underwater image, but the processed underwater image will have a halo effect;

[0032] Step 3: Perform high dynamic range image gradient compression on the image, that is, map the pixel value R of the image to the compression range R min , R max , through normalization processing, the output pixel value is R new Image;

[0033] The R min =avg(R)-n·var(R), R max =avg(R)+n·var(R),

[0034] In the formula: avg (R) represents the average value of the image pixel value R, var (R) represents the variance of the image pixel value R, n compression range adjus...

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Abstract

The invention discloses an underwater image processing method based on Retinex and high dynamic range image gradient compression, and the method comprises the steps: firstly carrying out the multi-scale Retinex algorithm processing of an underwater image, then carrying out the pixel value compression of the image after Retinex processing through a gradient domain high dynamic range image compression algorithm, attenuating the low-frequency noise through a high-pass filter, and enhancing the edge of the image; and finally, recovering the chromaticity by using a color saturation adjustment function. The halo effect caused after the Retinex method is used for processing the underwater image can be inhibited, the color cast influence caused by the underwater environment is improved, and the problems of low illumination, uneven illumination and the like of the underwater image are effectively solved.

Description

technical field [0001] The invention relates to an image processing method, in particular to an underwater image processing method based on Retinex and high dynamic range image gradient compression. Background technique [0002] Underwater image is an image taken underwater by optical imaging system, which is an important carrier of marine information. It has been widely used in marine energy exploration, marine ecological protection, marine military and other fields. However, due to the different attenuation characteristics of different wavelengths of light propagating in water, coupled with the influence of suspended particles and artificial light sources in underwater scenes, underwater images often have low contrast, blurred textures, color distortion, non-uniform illumination, and Quality degradation problems such as limited viewing range have brought great inconvenience to practical applications and scientific research. In order to restore clear and real underwater im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/04G06T5/00
CPCG06T2207/20024G06T2207/20192G06T2207/20208H04N25/11G06T5/90G06T5/70
Inventor 祝开艳苏钒维宋维波
Owner DALIAN OCEAN UNIV
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