A Dehazing Method Based on Dual-tree Complex Wavelet

A dual-tree complex wavelet and normalization technology, applied in the field of image processing, can solve the problems of ignoring influence, only considering, and unsatisfactory removal effect, and achieve the effect of simple calculation, improved quality, and enhanced display effect

Active Publication Date: 2018-02-02
CHANGZHOU LEMENG PRESSURE VESSEL CO LTD
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AI Technical Summary

Problems solved by technology

These defogging algorithms all assume that the ambient light is the same size value, and only consider the single scale of the image, ignoring the influence of different scale information on image processing
[0005] At present, although the dehazing algorithm in some simple scenes is relatively mature, the removal effect is not ideal in images with severe fog

Method used

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  • A Dehazing Method Based on Dual-tree Complex Wavelet
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  • A Dehazing Method Based on Dual-tree Complex Wavelet

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The invention proposes a two-step defogging method based on double-tree complex wavelet, which is used for misjudgment caused by fog in many visual fields such as transportation, military, aerospace, remote sensing, etc., improves the quality of obtained pictures, and enhances the display effect of images. This method has a good defogging effect on the image under uniform haze, improves the contrast of the image, and enhances the display effect of the image, so it is also an effective image defogging method. In the first step of the present invention, the high-frequency information of the image is analyzed by dual-tree complex wavelet transform to obtain an approximate value of atmospheric ambient light, and then in the second step, the atmospheric transmittance is derived by using the prior knowledge of the improved dark channel, and t...

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Abstract

The invention discloses a method for defogging based on double-tree complex wavelet, which belongs to the technical field of image processing. In the first step of the present invention, the approximate value of atmospheric ambient light is obtained through dual-tree complex wavelet transform, and then the second step uses the improved dark channel to derive the nonlinear normalized atmospheric transmittance map, and then estimates the fog map, and finally according to the original map , to eliminate the fog and form a fog-free map. The invention has better effect on removing natural images such as uniform fog.

Description

technical field [0001] The invention relates to image processing technology, in particular to a method for defogging based on double-tree complex wavelet. Background technique [0002] Vision is one of the most important sources for human beings to obtain external information, and there are many ways to obtain it. With the development of modern technology, most of the visual information is almost obtained through images. Due to severe weather (such as fog, haze, etc. ), the contrast of the image captured by the imaging system is significantly reduced, and the details will be blurred, which cannot reflect the real scene information at that time, which seriously affects the further analysis and decision-making of military, transportation, aerospace and daily life. Therefore, image defogging is very important Outdoor work plays a very important role. [0003] In recent years, image dehazing research has attracted more and more attention from many researchers at home and abroad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 朱锡芳相入喜吴峰许清泉蔡建文张美凤夏靖杰
Owner CHANGZHOU LEMENG PRESSURE VESSEL CO LTD
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