Quick image defogging method based on two times of guide filtration

A technology of guiding filtering and guiding images, which is applied in the field of image processing, and can solve problems such as general defogging effect, difficulty in real-time processing of defogging processing, and high difficulty in implementation.

Inactive Publication Date: 2014-09-17
HUAQIAO UNIVERSITY
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  • Description
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Problems solved by technology

Enhancement methods based on image processing include global image enhancement methods, such as global histogram equalization, homomorphic filtering, wavelet method, Retinex algorithm, etc., or localized image enhancement methods, such as local histogram equalization, local contrast Enhancement method; the above image processing algorithm is relatively simple, and the effect of defogging for complex scenes is general
Restoration methods based on physical models include restorati

Method used

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  • Quick image defogging method based on two times of guide filtration
  • Quick image defogging method based on two times of guide filtration
  • Quick image defogging method based on two times of guide filtration

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Embodiment Construction

[0042] The present invention provides a fast image defogging method based on two guiding filters. Firstly, the original fog image is preprocessed to obtain a rough estimation map of the atmospheric light curtain, and the guiding filter is used to obtain the guiding image; Then, the atmospheric light intensity value is calculated and the transmittance value is obtained based on the atmospheric scattering physical model, and the original fog image is restored; finally, the restored image is enhanced.

[0043] First define the following variables to facilitate the description of the algorithm:

[0044] The size of the image to be processed Image_size: image width weight*image height high;

[0045] Original foggy image I: If it is a color image, the values ​​of the R, G, and B channels are respectively I R ,I G ,I B ; If it is a grayscale image, then I is a single channel;

[0046] Atmospheric light intensity value A: the intensity of atmospheric light components, which can be...

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Abstract

The invention discloses an image defogging method based on two times of guide filtration. Firstly, an original foggy image is preprocessed to obtain an atmospheric light curtain rough estimation graph, and a guide image is obtained through a guide filter; secondly, a refined atmospheric light curtain graph is obtained through the guide filter; thirdly, the atmospheric light intensity value is calculated, and an atmospheric scattering physical model is adopted to conduct image restoration processing on the original foggy image; finally, the restored image is enhanced. The image defogging method based on two times of guide filtration has universality and popularity, effectively improves the definition of the image which is defogged and also effectively improves the real-time performance of an algorithm.

Description

technical field [0001] The invention belongs to the field of image processing, and relates to a fast image defogging method based on twice guided filtering, which can be used for fast defogging of a single image or continuous video. Background technique [0002] Fog is a common natural phenomenon. When images are taken in foggy days, due to the scattering effect of suspended particles in the atmosphere, the brightness of the captured image increases, the contrast decreases, and the recognizability of the image decreases. Even for photos taken under sunny conditions, the sharpness of the photos will be affected due to atmospheric scattering. In every real scene, photo clarity suffers because of the fact that light bounces off surfaces and scatters into the air before reaching the camera. This is because certain factors in the air (such as aerosols, dust, fog and smoke, etc.) can cause the surface color of the object to fade and cause the contrast of the entire image to decre...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 戴声奎王伟鹏高剑萍
Owner HUAQIAO UNIVERSITY
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