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Image defogging method

An image and image filtering technology, which is applied in the field of image defogging, can solve the problems that the processing effect is restricted by the actual environment, the processing result is not ideal, and it is not easy to realize the hardware, so as to ensure the high efficiency of defogging, overcome the loss of image details, and enhance the image The effect of details

Active Publication Date: 2020-05-08
NANJING INST OF TECH
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AI Technical Summary

Problems solved by technology

Although this method has a good image defogging effect, the processing results for bright areas including the sky are not ideal, and the algorithm is complex to implement, and the processing effect is restricted by the actual environment, so it is not easy to implement on hardware

Method used

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] see figure 1 , the present invention provides a technical solution: a method for image defogging of the present invention, comprising the steps of:

[0039] Step (1): collect an image I through the image acquisition system, convert it into an RGB image and obtain RGB data, and separate the three channel values ​​of R, G, and B.

[0040] Step (2): Statistically calculate the histogram information of the three channels R, G, and B in step (1), first perform h...

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Abstract

The invention discloses an image defogging method, and the method comprises the steps: firstly obtaining an outdoor foggy image I through image collection equipment, and separating the outdoor foggy image I to obtain RGB three-channel values; carrying out histogram equalization on a G channel, determining a filter coefficient, and carrying out equalization on a R channel and a B channel; meanwhile, subjecting the independent images of RGB three channels to Fourier transform to a frequency domain, to obtain filtered images by a Butterworth high-pass filter, and subjecting the filtered images to inverse Fourier transform; adding equalized images and the filtered images to obtain defogged images, and calculating gray values; and finally, changing the parameters of a filter to know that the gray entropy of the output defogged images is the maximum, namely a final result. The defect of image detail loss after traditional time domain histogram equalization is overcome, the information entropy of the image is increased, the image quality is better, the defogging efficiency is high, and hardware implementation of the algorithm is facilitated.

Description

technical field [0001] The invention belongs to the field of digital image processing, and in particular relates to an image defogging method. Background technique [0002] The current digital image processing technology has been applied to all aspects of people's daily life, traffic monitoring, target recognition, unmanned driving and other fields have put forward high requirements for digital image quality. However, with the development of world industry, automobile exhaust, industrial waste gas and other human activities have aggravated the smog weather, seriously affecting the quality of outdoor image collection, resulting in blurred pictures. Therefore, image dehazing has important research significance. At present, there are two main methods of image defogging: enhancement methods based on image processing and restoration methods based on physical models. The enhancement method based on image processing is not specifically aimed at the field of image defogging, but i...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T5/40G06T7/90
CPCG06T7/90G06T5/40G06T2207/20056G06T5/70
Inventor 陈敏聪梁瑞宇田丽鸿花涛
Owner NANJING INST OF TECH
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