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Image restoration method based on underwater prior constraints

An underwater image and image technology, applied in the field of image restoration, can solve problems such as no separate solution, and achieve the effect of good visual effect, clear detailed information, and good image details.

Inactive Publication Date: 2018-04-13
TIANJIN UNIV
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Problems solved by technology

Galdran et al. [8] The Red Channel prior is proposed to reduce the influence of the severely attenuated red channel on the transmittance estimation by inverting the red channel and adding the saturation component. Although this method points out the relationship between the transmittance of the three channels, it does not solve it separately The transmittance of each channel, but by weighting the background light to adjust each color component, the restored image still has serious color distortion

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  • Image restoration method based on underwater prior constraints
  • Image restoration method based on underwater prior constraints

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[0051] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, and the described specific embodiments are only for explaining the present invention, and are not intended to limit the present invention.

[0052] Since both underwater images and foggy images are affected by suspended particles in their respective media, many scholars use the atmospheric scattering model as the imaging model for underwater images. However, when light propagates underwater, it is affected by both scattering and absorption. Therefore, it is unreasonable to use the atmospheric scattering model reflecting the attenuation characteristics of foggy weather as the imaging model of underwater images.

[0053] Literature [9] assumes that the underwater ambient light and the color of the light source are approximately equal, and through this assumption, a new underwater imaging model is given:

[0054]...

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Abstract

The invention discloses an image restoration method based on underwater prior constraints. The method comprises the steps that firstly, a new image imaging model suitable for an underwater environmentis proposed by considering the difference of underwater three-channel attenuation; secondly, an effective color correction algorithm is used to remove color cast from an underwater image, and the Shades of Gray algorithm is used to estimate underwater environment light in the color-corrected image; thirdly, the boundary constraint of an original clear image is used to estimate the transmissivity,which can make up for the defect of inaccurate transmittance estimation of many current methods and the estimated transmissivity is refined; and finally, a clear restoration result is recovered by using the acquired transmissivity and the estimated environment light in combination with the new underwater imaging model. According to the invention, color distortion in the underwater image can be effectively removed; the image contrast can be enhanced; and the restored result is natural in color and clear in detail.

Description

technical field [0001] The invention relates to a computer image processing method, in particular to an image restoration method. Background technique [0002] Marine energy is an important strategic resource of our country, and the development and protection of marine resources is an important foundation for my country to build a powerful marine country. In recent years, underwater images have been widely used in the fields of marine energy exploration, marine ecological protection, and marine military. [1] . However, due to the influence of organic matter and suspended particles in underwater scenes, water has a strong absorption and scattering effect on light energy, which makes underwater images have problems such as low contrast, color distortion and loss of details. [2] . Therefore, the problem of underwater image restoration needs to be solved urgently in the field of computer vision application and digital image processing. [3] . [0003] The existing underwater...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10024G06T5/00G06T5/90
Inventor 杨爱萍曲畅田鑫杨炳旺
Owner TIANJIN UNIV
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