Underwater image color correction method based on complex underwater imaging model

An underwater image and imaging model technology, applied in the field of image processing, can solve the problems of not considering the influence of water, not having robustness, and the effect needs to be improved, so as to achieve the effect of restoring color and contrast and stabilizing the restoration result

Pending Publication Date: 2021-10-22
DALIAN MARITIME UNIVERSITY
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Problems solved by technology

However, the simple underwater imaging model is improved from the fog imaging model, and does not consider the influence of water on the selective absorption of light
The method based on this model is not robust, and the effect needs to be improved

Method used

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  • Underwater image color correction method based on complex underwater imaging model
  • Underwater image color correction method based on complex underwater imaging model
  • Underwater image color correction method based on complex underwater imaging model

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Embodiment 1

[0051] Such as figure 1 As shown, the present invention provides a method for correcting underwater image color based on a complex underwater imaging model, comprising the following steps:

[0052] Step S01: performing contrast stretching processing on the input original underwater image;

[0053] The contrast stretching process uses the following formula:

[0054]

[0055] where x min and x max Respectively represent the minimum and maximum values ​​of the pixels of each channel in the original underwater image, x represents each pixel of the image, and y represents the image after contrast stretching;

[0056] Step S02: Obtain a relative depth map of the underwater image after contrast stretching, and use guided filtering to enhance depth details;

[0057] Obtaining the depth map can be based on a self-supervised monocular depth estimation method (C.Godard, O.Mac Aodha, M.Firman, and G.Brostow, "Digging into self-supervised monocular depthestimation," in Proc.IEEE / CVF...

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Abstract

The invention provides an underwater image color correction method based on a complex underwater imaging model. The method comprises the following five processes: depth map estimation, back scattering removal, brightness map estimation, bandwidth attenuation coefficient estimation and image restoration; firstly, carrying out depth map estimation on an acquired underwater degraded image; secondly, estimating backscattering by using the depth map and the original underwater image; then, estimating a brightness map for the image subjected to back scattering removal; estimating a bandwidth attenuation coefficient by using the brightness map and the depth map; and finally, recovering an underwater image in combination with the complex underwater imaging model. The method can effectively realize color correction and contrast enhancement of the underwater image, improves the visual effect of the image, and can be applied to image preprocessing.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to an underwater image color correction method based on a complex underwater imaging model. Background technique [0002] Underwater images play an important role in marine environmental protection, marine engineering development, marine archaeology, etc., and provide visual basis for underwater robots to complete main tasks such as pipeline inspection and deep sea exploration. However, unlike terrestrial imaging, underwater imaging will be affected by light, climate, season, and suspended matter in the water, resulting in problems such as blue-green color cast and decreased contrast in underwater images. These problems greatly reduce the quality of underwater images and affect the application of underwater images in advanced vision tasks. [0003] Image restoration is an important means to recover degraded images. Restoration methods typically model the imaging environme...

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06T5/00G06T5/20
CPCG06T5/20G06T2207/10024G06T2207/10028G06T5/00G06T5/90
Inventor张维石杨彤雨周景春
OwnerDALIAN MARITIME UNIVERSITY