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Image defogging method based on dark channel prior

A dark channel prior and dark channel prior technology, which is applied in the field of image defogging based on dark channel prior, can solve problems affecting the effectiveness of outdoor vision systems, hue shift, and target contrast reduction.

Inactive Publication Date: 2017-09-05
ZHONGYUAN WISDOM CITY DESIGN RES INST CO LTD
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Problems solved by technology

It will lead to the reduction of contrast, saturation and hue shift of the target in the image, which will directly affect the effectiveness of the outdoor visual system. Therefore, it is very important to clear the degraded image in foggy weather

Method used

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  • Image defogging method based on dark channel prior
  • Image defogging method based on dark channel prior
  • Image defogging method based on dark channel prior

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Embodiment Construction

[0057] The technical solutions of the present invention will be described in further detail below through specific implementation methods.

[0058] Such as figure 1 As shown, an image defogging method based on the dark channel prior includes the following steps:

[0059] Step 1, read in the original foggy image;

[0060]

[0061] Among them, x is the spatial coordinate, I(x) is the foggy image, J(x) is the scene irradiance or clear and fog-free image, A is the atmospheric light value, ρ(x) is the scene albedo, t(x) is the medium transmittance; A(1-t(x)) is the atmospheric dissipation function;

[0062] Step 2, take the minimum value operation on both sides of the original foggy image I(x), and use the prior knowledge of the dark channel to preliminarily estimate the atmospheric light value A(x) through the grayscale opening operation, and perform white balance processing on the atmospheric light. Thereby obtaining the simplified image I'(x) of the original foggy image;

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Abstract

The invention discloses an image defogging method based on dark channel prior. The image defogging method based on dark channel prior comprises steps of 1) reading an original fogged image I(x), 2 ) performing an operation of taking a minimum value on two sides of the original fogged image I (x), using the dark channel prior knowledge to initially estimate an atmosphere light value and a medium transmissivity value through a grey scale opening operation, performing white balance processing on the atmosphere illumination so as to obtained a simplified image I'(x) of the original fogged image, 3) introducing a threshold T to obtain a mixed dark channel I<~><dark> of the simplified image I'(x), 4) using a sectional type mapping equation to perform mapping processing on the mixed dark channel I<~><dark> to obtain a rough estimation value t''(x) of the medium transmissivity and 5) obtaining an accurate estimation value t''' (x) of the medium transmissivity through a guided filtering method,, 6) using an adaptive parameter regulation method to perform revising on the medium transmissivity of a sky area to obtain a medium transmissivity t(x)m and 7) calculating a defogged image according to a final estimation value of the medium transmissivity t(x).

Description

technical field [0001] The invention relates to an image defogging method, in particular to an image defogging method based on dark channel prior. Background technique [0002] Haze is a common natural phenomenon, which is produced by the scattering and absorption of light by a large number of tiny water droplets, aerosols and other particles suspended in the atmosphere. It will lead to the reduction of contrast, saturation and hue shift of the target in the image, which will directly affect the effectiveness of the outdoor visual system. Therefore, it is very important to clear the degraded image in fog. [0003] In order to solve the above existing problems, people have been seeking an ideal technical solution. Contents of the invention [0004] The purpose of the present invention is to address the deficiencies of the prior art, thereby providing an image defogging method based on dark channel prior, which has the advantages of scientific design and good defogging effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/73
Inventor 陈长宝杜红民侯长生孔晓阳王茹川郭振强郧刚王磊王莹莹
Owner ZHONGYUAN WISDOM CITY DESIGN RES INST CO LTD
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