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Fast video defogging method based on space-time consistency constraint

A consistent and video technology, applied in the field of image processing and computer vision, can solve problems such as interrelated video flicker, achieve the effect of easy implementation and transplantation, ensure self-adaptive ability, and avoid flicker phenomenon

Active Publication Date: 2019-04-16
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology

Although some results have been achieved in image dehazing based on physical models, most of the existing methods are for single-frame image processing.
Human vision is very sensitive to the spatio-temporal consistency of videos, so simply applying a single-frame dehazing algorithm to a video without considering the interrelationships between video frames will result in video flickering after dehazing

Method used

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  • Fast video defogging method based on space-time consistency constraint
  • Fast video defogging method based on space-time consistency constraint
  • Fast video defogging method based on space-time consistency constraint

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] Step 1: According to the input image I c , use the quad-tree partition to find the instantaneous atmospheric light value

[0045] will input image I c Divide into 4 subspaces on average to form a quadtree, and use the mean value of each subspace minus the standard deviation as the final score of the subspace; select the subspace with the highest score to continue quadtree division, and repeat the process until the subspace after division Until the number of pixels in the space is less than the set value Z, Z=(M×N) / 2 7 , where M and N represent the length and width of the image respectively; the subspace with the highest score after the last segmentation is I c s (p), in the subspace I c s (p) Select the point with the closest Euclidean distance between RGB and [255,255,255] as the instantaneous atmospheric light value

[0046] Step 2: ...

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Abstract

The invention provides a fast video defogging method based on space-time consistency constraint. The method comprises: dividing the input image by using a quadtree to obtain an instantaneous atmospheric light value; and performing spatial-temporal consistency constraint on the instantaneous atmospheric light value, solving a global atmospheric light value, solving an initial transmissivity according to the global atmospheric light value and the input image, performing edge maintaining filtering on the initial transmissivity, solving a fine transmissivity, and performing defogging restoration according to the input image, the global atmospheric light value and the fine transmissivity. According to the method, the global atmospheric light value is subjected to space-time consistency constraint, so that the flickering phenomenon possibly generated when a video image is processed by a single-frame defogging algorithm is avoided. In the transmissivity estimation, the fog concentration of the image is judged, and the minimum value of the transmissivity is constrained by using the judgment result, so that the self-adaptive capability of the method under different fog conditions is ensured. A comparison algorithm is mostly adopted in transmissivity estimation, and hardware logic implementation and transplantation are very convenient.

Description

technical field [0001] The invention relates to the technical fields of image processing and computer vision, in particular to a fast video defogging method. Background technique [0002] Due to the complex ground and sea backgrounds and various types of targets, the detected targets at long distances are easily submerged in the background noise, especially in low visibility conditions, where aerosol particles such as haze, water vapor, and dust in the environment have a large impact on light waves. The absorption and scattering effect of the photoelectric system seriously affects the combat effectiveness of the photoelectric system. Image defogging technology is a means of image restoration to remove the influence of haze from images and videos taken in foggy scenes, restore the original color and detail information of objects, obtain high-quality images and obtain more effective image information the process of. [0003] According to whether it depends on the physical mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/11
CPCG06T7/11G06T2207/10016G06T2207/20024G06T5/73
Inventor 万锦锦仇振安崔灿张春景彭群聂
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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