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A Dehazing Method Based on Shape-variable Morphological Reconstruction

A technology of morphology and deformation structure, applied in image enhancement, image analysis, instrumentation, etc., to achieve clear texture details, avoid color distortion, and smooth transmittance

Active Publication Date: 2018-12-07
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0005] The purpose of the present invention is to provide a defogging method based on shape-variable morphological reconstruction to solve the problems existing in existing defogging algorithms

Method used

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Embodiment Construction

[0037] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] According to the atmospheric scattering model proposed by McCartney, the degradation process of the image in foggy days is inverted to obtain the scene image According to the image J, each channel satisfies the [0,255] pixel boundary limit, and the transmittance inequality is obtained as follows:

[0039]

[0040]

[0041] Combining the local contrast enhanced by defogging is inversely proportional to the transmittance, the optimal transmittance is obtained as:

[0042]

[0043] The first term in the formula is the transmittance corresponding to the minimum color channel image, and the second term is the transmittance corresponding to the maximum color channel. I(p)-A c The purpose of the operation can be understood as obtaining a high-brightness sky area, and Ac is the threshold value. However, if the atmospheric light va...

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Abstract

The invention discloses a defogging method based on shape-variable morphological reconstruction. The minimum color channel and the maximum color channel of the image are used to simultaneously calculate the corresponding medium transmittance in parallel, and the minimum color channel transmittance is optimized through morphological expansion reconstruction. Fusion of radiation transmittance distribution maps to obtain the optimal transmittance immune to the sky. Compared with the media transmittance refinement method in the existing defogging algorithm, the present invention can fundamentally suppress the halo phenomenon without prior detection, adaptively compensate for the low estimated transmittance of the sky area, and avoid distortion of the sky area in the dehazing result.

Description

technical field [0001] The invention relates to the technical field of image restoration, and specifically discloses a defogging method. Background technique [0002] In recent years, the air quality has deteriorated seriously, and severe weather such as fog and haze frequently occurs. Affected by fog and haze, the image presents the characteristics of low contrast and low definition, the detail information in the near view is seriously lost, and the features in the distant view are completely covered or blurred, and the identifiability of information is greatly reduced. At the same time, the color fidelity decreases, and serious color shift occurs. [0003] Image defogging is to remove the fog interference in the image through certain technical means, so as to obtain satisfactory visual effects and obtain more effective information. He et al. proposed the dark channel prior statistical law, and on this basis, proposed the "dark channel prior + guided filtering" algorithm,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10024G06T2207/20032G06T2207/20008G06T5/00
Inventor 张斌杨宏伟饶磊李艳婷
Owner XI AN JIAOTONG UNIV
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