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Bidirectional filtration-based real-time image de-hazing and enhancing method

A bilateral filtering, real-time image technology, used in image enhancement, image data processing, instruments, etc., can solve the problems of slow processing speed, high hardware requirements, slow image processing speed, etc., to improve image processing speed and ensure dehazing effect. , the effect of high practical value

Inactive Publication Date: 2011-01-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

This method also has a good effect on dense foggy images, but its limitations lie in the high complexity of the algorithm, slow processing speed, high hardware requirements, and difficult application in the fields of video surveillance, target tracking, and machine vision.
[0007] Therefore, due to the slow image processing speed of the prior art, there are problems that only static images can be processed and it is difficult to process dense foggy images.

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Embodiment Construction

[0042] In order to better illustrate the purpose and advantages of the present invention, the present invention will be further described below.

[0043] Step 1: Calculate the dark element map D of the foggy image based on the input foggy image I and estimate the atmospheric light vector A.

[0044] When the input image is a color image, D is the minimum value of the three RGB channels of each pixel of the input image;

[0045] D ( x , y ) = min c ( I ( x , y ) )

[0046] Among them, x, y represent the pixel coordinates in the image, and c=1, 2, 3 are the number of color channels of the image.

[0047] When the input image is a grayscale image, D is the grayscale value of each pixel of the grayscale image itself;

[0048] D(x,y)=I(...

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Abstract

The invention discloses bidirectional filtration-based real-time image de-hazing and enhancing technology, which is particularly applicable to the de-hazing and enhancement of images and videos under severe weather conditions and belongs to the field of digital image processing. The technology specifically comprises the following steps of: estimating an atmospheric light vector value A of an input hazy image; educing an atmospheric light curtain graphic V; calculating the irradiance R of the de-hazed image according to the calculated atmospheric light vector and the atmospheric light curtain graphic; and finally enhancing the calculated irradiance. The technology can accurately estimate the atmospheric light vector by a dark element-based method and estimate the atmospheric light curtain based on a bidirectional filtering method, reduces the calculation complexity and can ensure the image de-hazing effect; meanwhile, by improving the bidirectional filtering method, the technology increases the image processing speed qualitatively.

Description

technical field [0001] The invention relates to a real-time image defogging enhancement method based on bilateral filtering, which is particularly suitable for image defogging enhancement under bad weather conditions, and belongs to the field of digital image processing. Background technique [0002] In thin dust and fog weather, the outdoor images obtained by people are degraded images after being absorbed and scattered by particles such as mist and smoke in the atmosphere. These images have poor resolution, contrast and color fidelity, which has great impact on image analysis and information extraction. It has a great impact, reduces the application value of the image, and is not conducive to the extraction of image features. [0003] At present, most application systems such as reconnaissance, monitoring, intelligent vehicles and target tracking need to fully extract image features, and low-visibility images bring great difficulties to the normal work of outdoor machine v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/10
Inventor 孙抗汪渤郑智辉周志强董明杰石永生高志峰沈军
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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