Rapid image defogging method based on atmospheric physical scattering model

A scattering model and atmospheric technology, applied in the field of image processing, can solve problems such as long operation time and unsatisfactory recovery effect, and achieve the effect of avoiding halo artifacts and accurate estimation.

Inactive Publication Date: 2015-04-08
XIDIAN UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the above-mentioned existing defogging methods, such as unsatisfactory recovery effect and long operation time, etc. Based on the atmospheric physical scattering model, a new method for quickly obtaining ambient light, atmospheric curtain and transmittance is proposed. The optical model solves the reflection coefficient of the scene to obtain the final restored image

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  • Rapid image defogging method based on atmospheric physical scattering model
  • Rapid image defogging method based on atmospheric physical scattering model
  • Rapid image defogging method based on atmospheric physical scattering model

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Embodiment approach

[0060] The present invention proposes a method for estimating ambient light A based on grayscale morphology, and the implementation method is as follows:

[0061] (1) The basic principle of the imaging model

[0062] Order L 0 (x, y)=ρ(x, y)×A, ρ(x, y) is the reflectivity of the target, for the low reflectivity target in the image, when ρ(x, y)→0,

[0063] L 0 (x, y) → 0 (4)

[0064] Substituting formula (4) into formula (1), we can get,

[0065] L(x,y)=A(1-e -kd(x，y) ) (5)

[0066] It can be seen from formula (5) that for low-reflectivity targets, the greater the target depth of field, the more atmospheric particles in the optical path, so that the scattering effect of atmospheric particles on ambient light is stronger, and the image brightness is greater. When d(x, y)→∞, from formula (5) we can get

[0067] L(x,y)→A (6)

[0068] From equations (4), (5) and (6), we can see that ρ(x, y)→0 and d(x, y)→∞ are the solutions to L 0 Constraints on (x, y).

[0069] Based on...

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Abstract

The invention discloses a rapid image defogging method based on an atmospheric physical scattering model and relates to an image restoration method. Based on the atmospheric physical scattering model under weather conditions of fog and haze given by Narasimhan and the like, an image can be restored through rapid image defogging processing only by inputting the single image. The rapid image defogging method comprises the following steps of: taking minimum values of RGB (Red Green Blue) components at each pixel point of a collected color fog-degraded image, defining a generated gray-scale image as Idc, then conducting gray-scale erosion and expansion for the gray-scale image Idc, defining a result a I'dc which is also a gray-scale image, obtaining ambient light A by taking a maximum value of pixel grey-scale in the I'dc, conducting rapid combined double-sideband filtering for the Idc and the I'dc to obtain an atmospheric curtain V (x, y), then calculating the transmittance distribution ratio t (x, y), substituting the estimated ambient light A, the atmospheric curtain V (x, y), and the transmittance t (x, y) into the atmospheric physical scattering model to obtain a preliminary restoration result, and then further calculating the reflectivity of the RGB components of a scene target to obtain a final restored image.

Description

technical field [0001] The present invention relates to the field of image processing, and further relates to an image restoration method, specifically an image defogging method based on a physical model. According to an atmospheric physical scattering model, the opposite process is adopted to perform rapid image defogging processing to complete image restoration. The method effectively removes the haze in the image, reproduces the contrast and color of the scene, greatly improves the definition of the image, and has a good effect on removing the stain of the image. Background technique [0002] As the distance from the object to the imaging device increases, the impact of the scattering effect of atmospheric particles on the imaging gradually increases. This effect is mainly caused by two scattering processes: 1) when the reflected light on the surface of the object reaches the imaging device, it is attenuated due to the scattering of atmospheric particles; 2) natural light...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 孙伟郭宝龙韩龙陈龙
Owner XIDIAN UNIV
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