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Method for removing mixed noise of a color image

A color image and mixed noise technology, which is applied in the field of image processing, can solve the problems of color image denoising, mixed noise denoising less involved, two kinds of noise superposition and denoising complex, etc.

Active Publication Date: 2018-12-14
JILIN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for removing mixed noise in color images, which solves the problem that the image denoising method in the prior art is designed for a single noise, the superposition and denoising of two kinds of noise is complicated, and the denoising of color image mixed noise is currently less Issues involved

Method used

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  • Method for removing mixed noise of a color image
  • Method for removing mixed noise of a color image

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Experimental program
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Embodiment

[0083] Color image mixed noise removal method, such as figure 1 As shown, follow the steps below:

[0084] Step S1, detecting the pixel x to be processed i,j Whether it contains impulse noise, if it does not contain impulse noise, it will output Gaussian noise denoising as it is, and if it contains impulse noise, it will perform impulse noise denoising;

[0085] Step S11, detecting the pixel point x to be processed i,j Whether it contains impulse noise, such as figure 2 As shown, follow the steps below:

[0086] Select a 5×5 detection window, K p is the pixel to be processed x i,j is the centered direction operator, where, p∈(1,2,3,4), x i,j is the pixel point to be processed in the i-th row and the j-th column, and the pixel sets in the four directions can be determined by K p Indicates that, as shown below, the pixel position is where "1" is located,

[0087]

[0088] The pixel to be processed x i,j Color difference judgment in four directions, with K 1 Directi...

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Abstract

The invention discloses a method for removing mixed noise of a color image, which relates to the technical field of image processing. The invention performs denoising processing on the mixed noise composed of impulse noise and Gaussian noise based on the block matching filter and combined with the local characteristics of the image. At first, the impulse noise is denoised by utilizing the local statistic characteristic of the image, and then 3-D matching filtering, namely Gaussian denoising is performed according to the global sparsity and autocorrelation of the image. The invention fully utilizes the information characteristics of the image, so the invention can more effectively remove the mixed noise of the color image compared with the prior method, and is more suitable for the denoising processing of the natural image with high resolution and large color depth, and has strong practicability.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a method for removing mixed noise of a color image. Background technique [0002] Digital image processing has always been an important issue of computer intelligent processing, and image denoising is the pre-basic link of other image processing. With the development of image processing technology, color image mixed noise denoising has become one of the main directions of image denoising. [0003] The noise types of image denoising processing include impulse noise, Gaussian noise, Rayleigh noise, gamma noise, uniform noise, etc. In actual images, the main noises are impulse noise caused by unstable transmission lines and Gaussian noise caused by thermal noise of electronic devices. And noise often appears in the form of superposition as mixed noise. Therefore, the removal of mixed noise in color images not only has certain scientific research value, but also has certa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/20G06T5/10G06T5/00G06K9/62
CPCG06T5/10G06T5/20G06T2207/20032G06F18/23213G06T5/70
Inventor 祝宇鸿张强李志军迟学芬莫秀玲
Owner JILIN UNIV
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