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Image processing method for filtering mixed noise

An image processing and noise mixing technology, applied in the field of image processing, to achieve the effect of removing and Gaussian noise, simple algorithm and small amount of calculation

Inactive Publication Date: 2013-04-03
LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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Problems solved by technology

[0004] The purpose of the present invention is to provide an image processing method for removing mixed noise, to solve the shortcomings of median filtering, mean filtering and Wiener filtering in the image denoising process

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  • Image processing method for filtering mixed noise

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Embodiment Construction

[0019] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0020] In order to overcome the point removal existing in the image denoising process of median filter, mean filter and Wiener filter, the present invention provides a method that can better remove Gaussian white noise and salt and pepper noise, and at the same time has better A denoising method with good engineering real-time performance, the process flow of an image processing method for removing mixed noise of the present invention is as follows image 3 As shown, the specific process is as follows:

[0021] 1. Select an image with a size of 256×256 pixels containing mixed salt and pepper noise and Gaussian noise, such as figure 1 As shown, the increment of the number of columns is M, the increment of the number of rows is N, and the initial values ​​of M and N are both 1.

[0022] 2. Construct a filter window with a size of 3×3, that i...

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Abstract

The invention relates to an image processing method for filtering mixed noise and belongs to the image processing technical field. The image processing method for filtering the mixed noise comprises enabling a filter window center and pixel points of coordinates in the image to achieve superposition by building the filter window; obtaining mid-values of gray values of all the image pixel points in the filter window and determining a range of the gray values by utilizing threshold values; obtaining mean values as pixel point gray values of the image coordinates according to the sum of the pixel gray values and the pixel point numbers within the obtained range of the gray values; obtaining all the pixel point gray values of all the coordinates of the entire image to achieve the entire image processing in the same manner. The image processing method for filtering the mixed noise has the advantages of being capable of effectively filtering the impulse noise by choosing the mid-values as the center of the gray level window; restraining the gaussian noise by setting the threshold values to determine the range of the gray values according to the actual conditions and performing average on the pixel point gray values which fall within the range; not only effectively filtering the mixed salt and pepper noise and the gaussian noise, but also being simple in algorithm and being small in calculated amount simultaneously and being beneficial to the real-time application of the engineering.

Description

technical field [0001] The invention relates to an image processing method for removing mixed noise, belonging to the technical field of image processing. Background technique [0002] In the process of acquisition, acquisition, encoding and transmission, the image will be interfered by various noises to varying degrees, so that the image cannot truly reflect the scene, and the image quality is seriously degraded. Therefore, removing noise plays an important role in image processing. Image segmentation, feature extraction, image recognition, etc. have a direct impact. In order to reduce the influence of noise as much as possible, the degraded image must be pre-processed for denoising. [0003] There are many methods for image denoising, among which mean filtering, median filtering and Wiener filtering are three very effective methods. They have different denoising capabilities for different noises. The median filter has a better denoising ability for impulse noise. The alg...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 汪江华潘晓东
Owner LUOYANG INST OF ELECTRO OPTICAL EQUIP OF AVIC
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