Image defogging method and system

An image and input image technology, applied in the field of image processing and computer vision, can solve the problem of easy to produce halo effect, the color of the image is too saturated, etc., and achieve the effect of fast and effective dehazing.

CN105447825AInactive Publication Date: 2016-03-30HUBEI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-03-30
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides an image defogging method. The method comprises the following steps: step one, collecting a fog-contained image; step two, obtaining an initial atmospheric scattering function according to a boundary condition of the image; step three, refining the initial atmospheric scattering function by using a recursive two-sided filterer; step four, obtaining a local contrast by using the recursive two-sided filterer again; step five, on the basis of the local contrast, carrying out processing adaptively on fogged areas with different fog concentrations; and step six, obtaining a defogging result rapidly based on an image degradation model, carrying out hue adjustment, and then outputting and displaying a final result. With the method, edge information of the defogging result can be kept well and the detail is clear. Moreover, no residual fog and vignetting effect occurs at an area with a sudden change of the depth of field; the real scene is recovered to the greatest extent; and the visual feelings of people can be realized wholly.
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Description

technical field

[0001] The invention belongs to the field of image processing and computer vision, and in particular relates to an image defogging method and system thereof. Background technique

[0002] At present, for image dehazing, the research work mainly focuses on the dehazing of a single image. Commonly used image defogging methods include Retinex method, Fattal method, He method and Tarel method.

[0003] The Retinex method assumes that the input degraded image is the product of the brightness image and the reflection image. By removing or reducing the influence of the brightness image, the reflective image that reflects the essence of the scene is preserved as much as possible to remove the fog. However, it uses the non-linear function value of the chromaticity of the input image to compensate for the loss of color information in the process of color information processing, and cannot restore the true color of the scene.

[0004] The Fattal method first assumes ...

Examples

Embodiment Construction

[0022] Such as figure 1 As shown, the present invention provides a kind of image defogging method, and it comprises the following steps:

[0023] Step 1, collecting images containing fog;

[0024] Step 2, obtain the initial atmospheric scattering function according to the boundary conditions of the image;

[0025] Step 3, using recursive bilateral filtering to refine the initial atmospheric scattering function;

[0026] Step 4, use the recursive bilateral filter again to obtain the local contrast;

[0027] Step five, based on local contrast, adaptively process fog regions with different concentrations;

[0028] Step 6. According to the image degradation model, the dehazing result is quickly obtained, and the final result is output and displayed after adjusting the tone.

[0029] Preferably, in step 2, the global atmospheric light A is obtained according to the image degradation model, and a window ω(i) centered on the pixel i is used to perform minimum value filtering on t...