Rapid image defogging method based on spatial continuity principle

A technology of spatial continuity and image, applied in the field of image processing, it can solve the problems of difficult real-time processing, difficult implementation, and blurred image details for dehazing processing.

Active Publication Date: 2013-04-03
HUAQIAO UNIVERSITY
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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 restoration based on partial differential equations, restoration based on depth ...

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  • Rapid image defogging method based on spatial continuity principle
  • Rapid image defogging method based on spatial continuity principle
  • Rapid image defogging method based on spatial continuity principle

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Embodiment Construction

[0036] The present invention is a fast image defogging method based on the principle of spatial continuity. First, two integer Gaussian filter lookup tables are prepared according to the selected parameters, and the fast integer fixed-point calculation is realized by using the lookup table method, replacing the original floating-point function. Calculation; then based on the principle of spatial continuity, the estimated atmospheric light curtain filter is blurred, and the atmospheric scattering physical model is used to dehaze and restore the fog image; finally, a simple linear function is used to correct the image brightness to improve the visual effect of the image.

[0037] First define the following variables to facilitate the description of the algorithm:

[0038] Sliding window size Win_size during filtering processing: the actual value is determined according to the nature of the image, and the value range is [5, 25];

[0039] The size of the image to be processed Imag...

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Abstract

The invention discloses a rapid image defogging method based on a spatial continuity principle. The method includes firstly preparing two integer type filter lookup tables according to selected parameters to perform space domain and value domain bilateral filtering based on the lookup tables; then, performing blurring processing on an atmospheric light curtain estimation image based on the spatial continuity principle, and performing image restoration processing on a fog image by using an atmospheric scattering physical model; and finally, performing brightening processing on the restored image. The rapid image defogging method is general and universal, not only the definition of images is improved effectively, but also timeliness of algorithms is improved effectively.

Description

technical field [0001] The invention belongs to the field of image processing, and relates to a fast image defogging method based on the principle of spatial continuity, 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 elements in the air (such as aerosols, dust, fog and smoke, etc.) can cause the color of the surface of the object to fade, and cause the contrast of the...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 戴声奎张冰冰王伟鹏孙万源
Owner HUAQIAO UNIVERSITY
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