Single image defogging method based on structural information

A technology of structure information and single image, applied in image enhancement, image data processing, instrument, etc., can solve the problems of defogging image detail structure information preservation, color distortion, not very good, etc.

Inactive Publication Date: 2015-01-14
NORTHEAST NORMAL UNIVERSITY
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a single image defogging method based on structural information to solve the existing problems of serious color distortion, only partial fog removal, and poor retention of detailed structural information of the defogged image

Method used

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  • Single image defogging method based on structural information
  • Single image defogging method based on structural information
  • Single image defogging method based on structural information

Examples

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Embodiment Construction

[0082] Include the following steps

[0083] 1. Given a foggy image, such as figure 1 As shown, the resolution of the image is 450×441;

[0084] 2. Establish a physical model of image fog degradation;

[0085] The degradation model of foggy images consists of two parts. The first part is the direct attenuation term, which describes the attenuation result of the light reflected by the scene object in the medium. The second part is ambient light, which reflects the comprehensive effect of various light sources.

[0086] I(x)=J(x)t(x)+L ∞ (1-t(x)), (1)

[0087] Among them, I is the observed foggy image, J is the real image to be restored, L ∞ is atmospheric light, t(x)=e -d(x) is the transmittance, and t(x)∈(0,1), d(x) is the depth of field, it can be seen that the transmittance has a direct relationship with the depth of field.

[0088] A=L ∞ (1-t(x)) This term is called ambient light;

[0089] 3. Estimated atmospheric light L ∞ ;

[0090] Firstly, the hazy image is di...

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Abstract

The invention relates to a single image defogging method based on structural information and belongs to the field of digital image processing. A foggy image is given, an image foggy day degradation physical model is set up, atmosphere light is estimated, initial environment light is calculated, the structural information of the foggy image is extracted, the environment light is corrected, and a true image is restored. According to the single image defogging method based on the structural information, close-shot photographed images, medium-long-shot photographed images and long-shot photographed images can be better restored, and particularly the single image defogging method can be expanded to conduct defogging on videos.

Description

technical field [0001] The invention belongs to the field of digital image processing. Background technique [0002] Due to the atmospheric scattering phenomenon in the foggy environment, the visibility and contrast of the captured scenes are reduced, and the color is degraded. In many application fields, such as military defense, target recognition, traffic navigation, remote sensing, satellite imaging, etc., what is needed is clear, high-quality images or videos. Therefore, it is of great research significance to improve the reliability of the vision system by effectively removing the influence of fog. [0003] In general, existing image dehazing methods fall into two categories, multi-image and single-image based dehazing methods. Methods based on multiple image dehazing estimate depth information by obtaining multiple images of the same scene under different weather conditions, or by rotating the vibration filter on the camera, or using multiple priors. Such methods ca...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 齐妙郝巧红秦占民吕英华孔俊
Owner NORTHEAST NORMAL UNIVERSITY
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