Method and apparatus for eliminating noise

A technology for eliminating noise and noise, applied in the field of image processing, it can solve problems such as image quality deterioration and image blurring, and achieve the effect of eliminating noise and maintaining image edge information.
CN101308573AInactive Publication Date: 2008-11-19VIMICRO CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
VIMICRO CORP
Publication Date
2008-11-19
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention provides a method to eliminate noise, comprising the following steps: to compare a central pixel point and a neighborhood middle pixel point; to determine whether the central pixel point is a noise point based on the comparison result; if the central pixel point is a noise point, to replace the pixel value of the central pixel point with a weighted average of the pixel value of the neighborhood middle pixel point; if not, to replace the pixel value of the central pixel point with a weighted average between the pixel value of the neighborhood middle pixel point and the pixel value of the central pixel point. The method effectively eliminates the noise and well maintains the image edge information.
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Description

technical field

[0001] The invention relates to the technical field of image processing, in particular to a method and device for eliminating noise. technical background

[0002] A simple and effective method for reducing noise is to use a low-pass filter. When observing from different points, the low-pass filter uses the average value of the observed pixel and its surrounding adjacent pixels as the observed The new value of the pixel. With this method, there is no large change in the value of the observed pixel, but the random noise component having no correlation is averaged with the noise component contained in the surrounding pixels, and the value of this component is close to "0".

[0003] Therefore, when the above method is adopted, the suppression effect of the noise is enhanced with the expansion of the search area of ​​the surrounding pixels. However, using the surrounding pixels as an average operation, the information of the edge of the image is also reduced simi...

Claims

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