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Improved homomorphic filtering-based multi-scale Retinex image defogging method

A homomorphic filtering, multi-scale technology, applied in the field of image processing, to suppress the illumination component, improve the multi-scale Retinex dehazing residue, and improve the dehazing effect.

Inactive Publication Date: 2017-11-21
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a multi-scale Retinex image defogging method based on improved homomorphic filtering based on the defects of the background technology, so as to realize how to effectively improve the problem of excessive fog residue and unclear details in the defogged image

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  • Improved homomorphic filtering-based multi-scale Retinex image defogging method

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] First, if figure 1 As shown, a kind of multi-scale Retinex image defogging method based on improved homomorphic filtering provided by the present invention, it specifically comprises the following steps:

[0032] Step 01: Input the foggy image I(x);

[0033] Step 02: Improve the traditional homomorphic filter transfer function H(u,v), the expression of the traditional H(u,v) is: The improvement steps are as follows:

[0034] a: set the cutoff frequency D o ;

[0035] b: For the cutoff frequency at D o The part within is suppressed;

[0036] c: For the cutoff frequency at D o The above parts are enhanced;

[0037] d: set the cut-off frequency D o Other parameter values ​​other than , the improved homomorphic filtering transfer function expression is obtained:

[0038]

[0039] where r H Indicates the high-frequency gain, r L Indicates th...

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Abstract

The invention discloses an improved homomorphic filtering-based multi-scale Retinex image defogging method and belongs to the technical field of image processing. The method comprises the following steps of 01, inputting a foggy image I(x); 02, improving a conventional homomorphic filtering transfer function H(u,v); 03, decomposing the foggy image I(x) into R, G and B three color channel images, and performing improved homomorphic filtering on each color channel; 04, performing multi-scale Retinex algorithm processing on the filtered channel images obtained in the step 03; and 05, combining the channel images obtained in the step 04 to obtain a defogged image. The method has the advantages that the defogging effect is improved; and the defogged image is high in contrast, clear in detail, low in calculation complexity and high in speed.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a multi-scale Retinex image defogging method based on improved homomorphic filtering. Background technique [0002] Smog is a common weather phenomenon that occurs frequently and widely in my country. Affected by smog, it is difficult for imaging equipment to identify and extract image features, and our lives will be affected to a certain extent. For example, the incidence of traffic accidents increases in smog weather, the contrast of the images captured by the monitoring system is low, and it is difficult to extract the characteristics of people. Wait. [0003] Among the image enhancement-based dehazing methods, homomorphic filtering and Retinex algorithm are two representative dehazing algorithms. Both algorithms are based on the illumination reflection model, trying to remove the illumination light and retain the reflection light to obtain the original image. Color...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/73
Inventor 范保杰戴飞
Owner NANJING UNIV OF POSTS & TELECOMM
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