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Method and apparatus for eliminating noise

A technology for eliminating noise and noise, applied in the field of image processing

Inactive Publication Date: 2011-07-13
VIMICRO CORP
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Problems solved by technology

[0003] Therefore, when the above method is adopted, the suppression effect of noise is enhanced as the search area of ​​the surrounding pixels expands. However, using the surrounding pixels as an average operation, The information at the edge of the image is also reduced similar to the noise. As a result, although the noise is reduced, the entire image becomes blurred, that is, the quality of the image deteriorates.

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  • Method and apparatus for eliminating noise

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Embodiment Construction

[0050] In order to make the purpose of the present invention more clear, it will now be described in conjunction with the accompanying drawings and specific embodiments. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0051] figure 1 It is a flow chart of the noise elimination method of the present invention.

[0052] Such as figure 1 As shown, the process of noise elimination is realized through the following steps:

[0053] S101, comparing the center pixel with the pixels in the neighborhood;

[0054] The coordinate value of the center pixel point can be expressed as (x, y), and the coordinate value of each pixel point in the neighborhood is correspondingly expressed as (x+i, y+j), where j represents the number of rows above and below the center pixel point , i represents the number of rows to the left and right of the center pixel; where...

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Abstract

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

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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 沈操王浩
Owner VIMICRO CORP
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