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A fast, image technology, applied in image data processing, instruments, calculations, etc., can solve the problems of image contrast drop, color distortion, etc., to achieve fast processing speed, fast defogging, and good processing effect.
Inactive Publication Date: 2011-05-18
HARBIN INST OF TECH
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[0006] The purpose of the present invention is to provide a fast defogging method, which can not only effectively improve the problems of image contrast reduction and color distortion obtained in foggy weather, but also has a fast processing speed and can meet the occasions with high real-time requirements
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example 1
[0034] Example 1: This example is the process of defogging a grayscale image, and the specific process is as follows.
[0035] 1: The original foggy grayscale image is read in, and the grayscale image is marked as I.
[0036] 2: Perform minimum value filtering on each pixel point I(x, y) in I to obtain I g dark (x, y), the calculation formula is as follows:
[0037] I g dark ( x , y ) = min ( i , j ) ∈ Ω ( x , y ) ( I ( i , j ) )
[0038] Wherein Ω (x, y) is a sma...
example 2
[0054] Example 2: This example is the process of dehazing a color image, and the specific process is as follows.
[0055] 1: The original foggy color image is read in, and the image is marked as I.
[0056] 2: For each pixel in I, find the minimum value of the three channels of R, G, and B, and assign it to the current pixel. After processing, a grayscale image is obtained, which is recorded as I g ,Calculated as follows:
[0057] I g ( x , y ) = min c ∈ { R , G , B } ( I c ( x , y ) )
[0058] Among them, R, G and B are the three channels of the pixel point I...
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Abstract
The invention relates to a rapid defogging method, comprising the following steps of: solving for the RGB (Red Green Blue) minimum of each pixel point to obtain a grayscale image, carrying out minimum filtering on the grayscale image to obtain a dark primary-color image, estimating atmospheric parameters by using the dark primary-color image, uniformly selecting some points in the image to solve for transmissivity, carrying out binary bilinear regression analysis to obtain the transmissivity of all points of the image, and recovering a fog-free image according to the transmissivity and the atmospheric parameters. The algorithm provided by the invention has the characteristics of good processing effect and high speed, and can be easily applied to systems with higher requirements on real-time property.
Description
Technical field: [0001] The invention belongs to the technical field of digital image processing, in particular to a fast defogging method for improving the quality of foggy images in the field of computer vision. Background technique: [0002] In the case of foggy weather, due to the low visibility of the scene, the characteristics such as target contrast and color are attenuated, resulting in the outdoor video surveillance system not working properly, so the video and image need to be processed to eliminate the impact of the weather, so the image defogging Processing has become the focus of people's research. [0003] The current methods of fog image processing can be roughly divided into two categories: one is based on image enhancement methods, which do not consider the specific formation process of fog images, but only select the interesting part of the image for enhancement. Commonly used image enhancement methods mainly include histogram equalization, homomorphic fil...
Claims
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