Single image defogging method based on luminance dark priori method and bilateral filtering

A bilateral filtering, single image technology, applied in the field of image processing, which can solve the problems of reducing time complexity, dehazing failure, etc.

Inactive Publication Date: 2014-08-13
XIAN UNIV OF TECH
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[0006] The object of the present invention is to provide a single image defogging method based on luminance dark prior and bilateral filtering, which

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  • Single image defogging method based on luminance dark priori method and bilateral filtering
  • Single image defogging method based on luminance dark priori method and bilateral filtering
  • Single image defogging method based on luminance dark priori method and bilateral filtering

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[0048] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0049] The main reason for image degradation in foggy weather is the scattering effect of atmospheric particles. Its scattering effect mainly has two effects. One is that due to the scattering of atmospheric particles in foggy days, the target light energy will attenuate before reaching the monitoring equipment, thereby reducing the intensity of the target light energy; The scattering of atmospheric particles in foggy days reaches the monitoring range of the monitoring equipment and is captured by the monitoring equipment, which interferes with the target image. It is precisely because of the existence of these two effects that the images taken in foggy days are so unclear. These two effects can be expressed as two physical models: the direct attenuation model of incident light and the atmospheric light imaging model. Narasimhan and Nayar et...

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Abstract

The invention discloses a single image defogging method based on a luminance dark priori method and bilateral filtering. A new image priori method, the luminance dark priori method, is used for estimating the fog concentration and restoring an image, the priori method is based on the statistical law of fog-free image HSI color space luminance components, and according to the statistical law, some pixels exist in local areas of most fog-free images, and the strength value of the luminance components I of the pixels is low and approaches to zero. Based on the priori method, the image is firstly transformed to the HSI color space to obtain the luminance components, a dark priori image is calculated, then atmosphere light and transmissivity are estimated through the luminance dark priori method, the transmissivity is refined through the bilateral filtering, and finally restoration is carried out according to an atmosphere scattering model to obtain the fog-free images. According to the method, the contrast ratio of the image is enhanced obviously, grain details in the images are restored, the visual effect of the image is obviously improved, and the good algorithm performance is achieved.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a method for defogging a single image based on brightness-dark prior and bilateral filtering. Background technique [0002] With the development of computer vision and image processing technology, outdoor vision systems have been widely used in transportation, security defense, terrain detection and other fields. However, under foggy conditions, due to the scattering effect of atmospheric particles, the images acquired by the outdoor vision system have quality degradation problems such as reduced contrast, color distortion, and blurring, resulting in feature extraction, target discrimination, and target tracking. Therefore, it has important practical application value to study the dehazing technology of degraded images in foggy weather. [0003] The scene depth information of the degraded image is an important clue to restore the foggy image. According to w...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 石争浩杨欢娣
Owner XIAN UNIV OF TECH
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