Fast defogging method for underground pipeline images based on dark channel color prior

A dark primary color prior, underground pipeline technology, applied in the field of fast dehazing algorithm for underground pipeline images, can solve the problems of high algorithm complexity, inability to use real-time dehazing processing, unable to meet the requirements of video stream processing, etc., to improve the definition , taking into account the effect of timeliness

Active Publication Date: 2020-04-28
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

However, this method uses the soft matting method to refine the transmittance map, resulting in high algorithm complexity, which cannot meet the requirements of video stream processing, and cannot be used for real-time defogging processing.

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  • Fast defogging method for underground pipeline images based on dark channel color prior
  • Fast defogging method for underground pipeline images based on dark channel color prior
  • Fast defogging method for underground pipeline images based on dark channel color prior

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[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, which are not intended to limit the present invention.

[0021] Such as figure 1 As shown, the implementation process of the method of the present invention specifically includes the following steps:

[0022] S1.1: Preprocess the original foggy underground pipeline image to obtain the dark channel image corresponding to the original foggy image, and use the obtained dark channel image to eliminate the factors that affect the atmospheric light value in the foggy image. In this embodiment, the dark channel prior algorithm is used to preprocess the foggy images, wherein the dark channel prior algorithm is obtained through the statistics of multiple fog-free images, specifically: in most of the fog-free images In the local area except the area where the...

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Abstract

The present invention proposes a fast underground pipeline image defogging method based on dark channel prior. By preprocessing the image of the foggy underground pipeline, the dark primary color image corresponding to the foggy image is obtained; mean filtering is performed on the acquired dark primary color image to estimate the image transmittance; an offset value is compensated for the result of the mean filtering to obtain the transmission The rough estimate of the rate; the pixel value of the original image and the mean-filtered image is used to estimate the global atmospheric light; the physical restoration model is used to restore the image after dehazing. The beneficial effect of the present invention is that the method not only guarantees a certain defogging effect, but also takes into account the rapidity of the algorithm, can realize real-time defogging, and is suitable for scientific fields such as video monitoring of underground pipeline environments, underground pipeline disease identification, and the like.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a fast defogging algorithm for underground pipeline images based on dark channel priors. Background technique [0002] In the environment of urban underground pipelines, the internal images of the pipeline acquired by the pipeline disease detection robot play an important role in the identification of pipeline diseases. The image of the pipeline received has degradation phenomena such as low contrast and fuzzy details, which affect the normal work of the vision system of the pipeline inspection robot. Therefore, it is necessary to dehaze and restore the collected images. [0003] At present, researchers mainly study the problem of image dehazing from two directions: the direction based on image enhancement and the direction based on physical model. The defogging method in the direction of image enhancement is mainly aimed at the degraded image itself, using image processing meth...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T5/20
CPCG06T5/003G06T5/008G06T5/20G06T2207/20024G06T5/007G06T2207/10024G06T5/009G06T2207/30184
Inventor 李策何坦杨峰
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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