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Method for defogging single image

A single image, image technology, applied in the field of single image dehazing, can solve the problem of time-consuming calculation and achieve the effect of improving real-time performance

Inactive Publication Date: 2014-08-27
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The dark channel method needs to calculate the minimum value twice for each sliding window image block. The operation of calculating the minimum value needs to sort all the pixels in the image block according to the pixel value, so the calculation is more time-consuming.

Method used

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  • Method for defogging single image
  • Method for defogging single image

Examples

Experimental program
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Embodiment

[0051] As shown in Figure 2(a), the dehazing process of the color image I to be defogged is 470×350 in detail as follows: Step A, obtain the regional color mean vector and L2 norm of the RGB image I to be defogged;

[0052] Step A-1. Input the RGB image I to be defogged with a size of 470×350. Each pixel in the image I corresponds to a 1×3 color vector [I R (i,j),I G (i,j),I B (i, j)], where i, j represent pixel coordinates, i∈[1,470], j∈[1,350];

[0053] Step A-2: Get all the area windows Ω(i,j) in the image I that meet the following conditions: the area window takes the i-th row and j-th column as the center pixel point, and the size is (2r+1)×(2r+1 ); wherein, r is the radius of the region window, r=7 means to take 7 pixels, that is, the size of the region window is 15×15, and the value range of i is an integer between 8 and 463; the value range of j is an integer between 8 and 354;

[0054] Step A-3: Use the following formula to obtain the image I region color mean vec...

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Abstract

The invention discloses a method for defogging a single image. A propagation image is acquired through regional color mean vectors of an RGB image I to be defogged and an L2 norm of the RGB image I to be defogged, and then the defogged image is calculated according to the propagation image and an atmosphere light value. According to the method, the single RGB color image can be directly utilized, and no information provided from the outside is needed; meanwhile, in the calculation process of the defogged image, the defogged image can be directly obtained through coefficients, and the brightness of the image does not need to be further increased after the image is defogged so as to meet the display requirement.

Description

technical field [0001] The invention belongs to the field of digital image processing, is suitable for preprocessing in the early stage of computer vision applications, and can be widely used in the fields of road, square video monitoring, driving recorder and the like, and more specifically is a method for defogging a single image. Background technique [0002] In recent years, my country's air pollution has become more and more serious. The resulting smog has reduced the visibility of the atmosphere. It is difficult for the outdoor video surveillance system to directly obtain image information with a certain degree of visibility, which directly leads to the failure of the surveillance system. Therefore, on the basis of the image obtained by the camera, it is of great significance to use the software algorithm to realize the image defogging process and increase the visibility of the image. [0003] The existing image defogging algorithms mainly include: methods based on mul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 丁萌魏丽王帮峰刘中杰
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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