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Single image defogging method based on quadtree decomposition and non-local prior

A quadtree decomposition, single image technology, applied in image enhancement, image analysis, image data processing and other directions, can solve problems such as block effect, noise interference, etc., achieve fast running speed, small amount of calculation, fine transmittance image accurate effect

Active Publication Date: 2020-08-28
XIAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a single image defogging method based on quadtree decomposition and non-local prior, which solves the problem of not only noise interference but also block effect in the prior art

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  • Single image defogging method based on quadtree decomposition and non-local prior
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  • Single image defogging method based on quadtree decomposition and non-local prior

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Embodiment Construction

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] refer to figure 1 , the method of the present invention is implemented according to the following steps:

[0022] Step 1. Utilize the image acquisition device to obtain the haze image I(x) that needs to be dehazed, and use the quadtree decomposition method to divide the haze image I(x) into different blocks.

[0023] Then the quadtree is decomposed into: in, Is the block after quadtree decomposition, l=1,2,3,...,L represents the number of blocks, Indicates that the quadtree decomposition is performed on the image I(x), where I(x) is the original haze image, and k is a threshold constant;

[0024] Quadtree decomposition first decomposes the image into four blocks, and then performs threshold judgment. If the difference between the maximum value and minimum value of a certain block is greater than the threshold constant k, the blo...

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Abstract

The invention discloses a single image defogging method based on quadtree decomposition and non-local prior, and the method comprises the steps: 1, obtaining a haze image I (x) which needs to be defogged through image collection equipment, and dividing the haze image I (x) into different blocks in a quadtree decomposition mode; 2, estimating the rough transmissivity of the haze image based on non-local prior; 3, performing morphological closing operation on the rough transmissivity obtained in the step 2; 4, obtaining fine transmissivity by using smooth filtering; and 5, recovering the fog-free image according to the atmospheric scattering model. According to the method, the problems of noise interference and blocking effect in the prior art are solved.

Description

technical field [0001] The invention belongs to the technical field of computer vision and digital image processing, and relates to a single image defogging method based on quadtree decomposition and non-local prior. Background technique [0002] In recent years, the development of intelligent vision systems is very rapid, such as intelligent vehicle visual navigation systems, intelligent robot vision systems, etc. The quality of images collected by the vision system has an important impact on the stability of the system. However, frequent fog and haze weather reduces the quality of images obtained by outdoor smart devices, which poses a threat to the security and stability of the system. serious negative impact. Therefore, restoring clear and fog-free images has certain practical application value. [0003] The current methods for haze image processing are mainly divided into three categories: based on image enhancement, based on physical model restoration and dehazing ba...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10004G06T2207/20024G06T5/00
Inventor 孙帮勇余喆
Owner XIAN UNIV OF TECH