Underwater image quality improvement method based on multi-scale fusion

A multi-scale fusion and underwater image technology, applied in the field of image processing, can solve the problems of relying on degraded models, underwater image noise, complex process, etc., and achieve the effect of reducing quality degradation, detail and edge enhancement, and fast speed

Inactive Publication Date: 2018-08-24
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0009] In order to solve the technical problems of the existing underwater image quality improvement methods that are complicated in process or rely too much on degenerate models, the present invention proposes an underwater image quality improvement method based on multi-scale fusion, which is mainly used to improve underwater image noise, Problems with large color difference and low contrast to improve image quality

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  • Underwater image quality improvement method based on multi-scale fusion
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  • Underwater image quality improvement method based on multi-scale fusion

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[0065] Below in conjunction with accompanying drawing, the present invention will be further described.

[0066] see figure 1 , the underwater image quality improvement method based on multi-scale fusion provided by the present invention comprises the following steps:

[0067] Step 1. Carry out color correction to the original underwater image (low-quality underwater image) to eliminate the image color cast caused by various light sources and restore the white and gray shadows of the image. The specific method is:

[0068] Step 1.1 performs white balance processing on the original underwater image.

[0069] Step 1.2 Convert the image after white balance processing from RGB color space to Lab color space, and record the resulting image as image I 1 .

[0070] Step 2, to described image I 1 Perform contrast enhancement to reduce image quality degradation caused by volumetric scattering, the specific method is:

[0071] Step 2.1 on Image I 1 Performs limited contrast histog...

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Abstract

In order to solve the technical problem that a current underwater image quality improvement method is complex in process or depends too much on an involution-form model, the invention provides an underwater image quality improvement method based on multi-scale fusion. The method is mainly used to improve the problems of large noise, large aberration and low contrast of an underwater image and improve the image quality. The current underwater image quality improvement method comprises the steps of: performing color correction of original images, eliminating color cast of the images caused by various light sources, performing enhancement of the contrast of the images, reducing the quality degradation caused by volume scattering, and finally, performing multi-scale fusion of the images to obtain an underwater image with observably enhanced details and edges, reduced noise, more clear dark areas and higher global contrast. The current underwater image quality improvement method is low in calculation cost and can perform execution at a relatively rapid speed on general-purpose hardware.

Description

technical field [0001] The invention belongs to the technical field of image processing and relates to a method for improving underwater image quality. The invention can be applied to the fields of marine resource exploration and development, marine ecological monitoring, underwater military reconnaissance and the like. Background technique [0002] Water has a serious absorption and scattering effect on light. Absorption will reduce light energy, and scattering will cause changes in light direction, making light decay exponentially with distance and depth, resulting in large image noise and degrading image quality. Moreover, the propagation distance of light underwater is limited, which affects the aberration of general underwater imaging systems, resulting in increased chromatic aberration and distortion, poor imaging quality, and low image quality. Although the quality of underwater images can be improved by using multiple images, dedicated hardware, and polarization fil...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/50G06T5/40
CPCG06T5/007G06T5/40G06T5/50G06T2207/20016G06T2207/20221
Inventor 李学龙卢孝强陈文静
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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