Image defogging method and system

An image and image restoration technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as the inability to essentially remove haze and the limitation of the function of the defogging mirror.

Inactive Publication Date: 2016-12-21
BEIJING YUANXIN SCI & TECH
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  • Claims
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Problems solved by technology

In actual use, it is found that the anti-fog mirror is not very effective in haze days, or to be precise, the anti-fog mirror can make the color of the photo more colorful, but for the haze weather with no color itself, the function of the anti-fog mirror is also used. restricted
The defogging mirror can improve the contrast, enhance the color, enhance the level, and improve the sharpness. This function is not simply to increase the contrast or sharpen. With other adjustments in the post-production software, it can quickly improve the graying problem of the picture, but it cannot remove the fog in essence. haze

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[0027] The scope of applicability of the present invention will become apparent from the detailed description given below. It should be understood, however, that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are given for purposes of illustration only.

[0028] In computer vision and image processing technology, based on the atmospheric scattering model, the following equations are generally used to describe the model of foggy images:

[0029] I(x)=J(x)t(x)+A[1-t(x)] (1)

[0030] Among them, I(x) is the image to be defogged, J(x) is the haze-free and clear image to be restored, parameter A is the global atmospheric intensity coefficient, t(x) is the transmittance, and image defogging is the known condition I( x), find the target J(x).

[0031] Dark primary color prior: It is considered that the fog-free outdoor natural scene image, after the dark primary color priority processing, the brightness of most pixels is ...

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Abstract

The invention discloses an image defogging method and a system. The method comprises steps that downsampling of a to-be-defogged original image I and a guiding image p is carried out; on the basis of a downsampling image, mean values muk and Pk<-> of the original image I and the guiding image p in a kernel function window, and a variance Qk<2> are resolved; on the basis of the mean values and the variance, a guiding filtering image qi of the downsampling image is resolved, namely transmissivity of the downsampling image; rising-sampling of the transmissivity of the downsampling image is carried out to acqurie fine transmissivity t of the original image; no-fog image recovery of the to-be-defogged image is carried out on the basis of the fine transmissivity. Through the method, not only can image details be guaranteed, but also efficiency is improved, and thereby practicality of the defogging technology is guaranteed especially in a mobile terminal.

Description

technical field [0001] The present application relates to the general field of image data processing, and in particular to an image defogging method and system. Background technique [0002] In recent years, the air quality has deteriorated seriously, severe weather such as smog occurs frequently, and the PM2.5 value has attracted more and more widespread attention. For images taken in foggy weather, due to the serious influence of the turbid medium in the atmosphere on the absorption and scattering of light, the intensity of "transmitted light" is attenuated, which changes the light intensity received by the optical sensor and directly leads to a decrease in image contrast. , the dynamic range is reduced, blurred, not clear enough, the details of the image are not obvious, many features are covered or blurred, and the recognizability of information is greatly reduced. At the same time, the color fidelity decreases, and serious color shift and distortion appear, which not o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/73
Inventor 刘倩
Owner BEIJING YUANXIN SCI & TECH
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