Self-adapting enhancement method of underwater degraded image

An adaptive enhancement and image technology, applied in the field of image processing, can solve problems such as not being able to perceive image details

Inactive Publication Date: 2015-07-08
HOHAI UNIV CHANGZHOU
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Problems solved by technology

Cones can recognize the details of the image, but do not work in low light, and rods work in low light, but cannot perceive the details of the image

Method used

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  • Self-adapting enhancement method of underwater degraded image
  • Self-adapting enhancement method of underwater degraded image
  • Self-adapting enhancement method of underwater degraded image

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0032] Such as figure 1 As shown, the adaptive enhancement method for underwater degradation images includes the following steps:

[0033] Step 1: Collect a single underwater color image, divide the color image into three channels of R, G, and B, and perform logarithmic transformation on the three channels of the color image respectively;

[0034] Step 2: Use the local contrast enhancement processing of the logarithmically transformed image based on the visual characteristics of the human eye; that is, use the local linear relationship between the subjective brightness perception of the human eye and the actual light intensity, and based on the brightness value of each pixel and its neighborhoo...

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Abstract

The invention discloses a self-adapting enhancement method of an underwater degraded image in the technical field of image processing. The method comprises the steps that a single underwater color image is collected, logarithm transformation is firstly carried out on an input image, then local contrast enhancement processing is carried out on the image obtained after logarithm transformation based on the human eye visual characteristic, and meanwhile illumination estimation is carried out on the image obtained after logarithm transformation through Gaussian homomorphic filtering with a weight; the image obtained after illumination estimation is subtracted by the image obtained after local contrast enhancement; finally, on the basis of analyzing all channel histograms of a deblurred image, color correction and restoration are carried out on the image obtained after multi-scale Retinex enhancement through a color gradation quantization algorithm of the histograms. Image burring caused by the water absorption and particle matter scattering function can be removed well, and the interference of water colors on the color of the image can be removed well.

Description

technical field [0001] The invention relates to an adaptive enhancement method for underwater degradation images, belonging to the technical field of image processing. Background technique [0002] Underwater, light waves do not have the excellent transmission characteristics of sound waves. Water bodies have a strong absorption effect on light energy. What is more unfavorable is that water bodies and suspended particles have a strong scattering effect on light. The lower the transparency of water, the lower the scattering effect. more serious. The absorption and scattering effects of underwater light transmission greatly limit the distance of underwater visible light imaging. Both theory and practical experience have proved that when the illumination power reaches a certain level, image contrast and observation distance cannot be improved only by increasing the illumination power. Therefore, it is an important means to increase the effective underwater observation distanc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 曹美盛惠兴程亚玲李庆武周妍俞楷仇春春郭晶晶程海粟
Owner HOHAI UNIV CHANGZHOU
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