Single night image defogging method based on Retinex theory

An image and theoretical technology, applied in the field of single night image defogging based on Retinex theory, can solve problems such as haze interference, blurred details, noise amplification, etc., to achieve the effect of improving clarity and solving image quality degradation

Pending Publication Date: 2021-11-19
SOUTHWEST UNIVERSITY
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Problems solved by technology

[0005] The present invention proposes a single night image defogging method based on the Retinex theory, aiming to simultaneously overcome the problems of glow effect, too dark brightness, haze interference, fuzzy details and noise amplification of foggy images at night

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  • Single night image defogging method based on Retinex theory
  • Single night image defogging method based on Retinex theory
  • Single night image defogging method based on Retinex theory

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] Such as figure 1 Shown in, the present invention is a kind of single night image defogging method based on Retinex theory, it is characterized in that, mainly comprises the following steps:

[0023] (1) Use the glow decomposition method to preprocess the input single nighttime fog image, and decompose the glow layer;

[0024] (2) Construct a Retinex decomposition model using mixed norm constraints to simultaneously decompose the residual image after glow decomposition into illumination image, reflection image and noise image;

[0025] (3) Perform brightness compensation and defogging operations on the decomposed illumination image using gamma correction and prior knowledge;

[0026] (4) Use nonlinear stretching operations to enhance texture details of reflected images;

[0027] (5) Combine the processed illuminance image and...

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Abstract

The invention discloses a single night image defogging method based on a Retinex theory, and relates to the technical field of image defogging. The method comprises the following steps: (1) preprocessing an input single night foggy day image by using a glow decomposition method, decomposing a glow layer, and solving a glow effect caused by an artificial light source in the night foggy day image; (2) utilizing a mixed norm constraint to construct a Retinex decomposition model to simultaneously decompose a residual image after glow decomposition into an illumination image, a reflection image and a noise image; (3) performing brightness compensation and defogging operation on the image by using gamma correction and priori knowledge in sequence according to a contrast image, and solving the problems of relatively dark brightness and haze interference of the night foggy day image; (4) carrying out nonlinear stretching on the reflection image to enhance texture detail information; and (5) finally, combining the processed illumination image and reflection image to obtain a final defogged image. The method has universality and universality, and can solve the degradation problems of haze interference, relatively dark brightness, fuzzy texture, noise amplification and the like at the same time for night foggy day images of most scenes.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to a single nighttime image defogging method based on the Retinex theory. Background technique [0002] With the rapid development of computer technology and the reduction of the cost of hardware equipment, cameras and their computer vision systems have been widely used in various outdoor scenes instead of human eyes, such as target recognition and tracking, intelligent monitoring systems, locomotive navigation, wireless Human driving and satellite remote sensing, etc. However, the basis for these outdoor computer vision systems to work properly is that the acquired images or videos have good clarity. Under severe weather conditions such as fog and haze, the light emitted by the object is attenuated by the scattering of suspended particles (water vapor, aerosol, etc.) in the atmosphere during the imaging process of the image collected outdoors, and the scattered ambient ligh...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/50
CPCG06T5/50G06T5/94G06T5/92G06T5/73G06T5/70
Inventor 刘运严中圣赵泽游倩
Owner SOUTHWEST UNIVERSITY
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