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Switch weighting vector median filter method utilizing edge detection

A technology of vector median filtering and weighted vector, which is applied in image data processing, instrumentation, calculation, etc., to achieve the effect of protecting details, improving processing effect, and suppressing impulse noise

Inactive Publication Date: 2014-05-07
TIANJIN UNIV
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Problems solved by technology

Weighted vector median filtering is to apply different weights to each pixel in the filtering window, so as to control the filtering process more accurately and improve the filtering effect, but there are no reports of related mature technologies.

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  • Switch weighting vector median filter method utilizing edge detection
  • Switch weighting vector median filter method utilizing edge detection
  • Switch weighting vector median filter method utilizing edge detection

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Embodiment Construction

[0034] The invention relates to a switch weighted vector median filter based on image edge detection, which is used for eliminating impulse noise in color images while protecting image details.

[0035] The purpose of the design of the present invention is to perform noise monitoring by comparing the similarity between the pixels in the noise image and the corresponding pixels in a reference image (obtained by scalar median filtering of the R, G, and B components of the noise image). , the vector median filter is performed on the suspected noise points through a weighting method based on edge detection, so as to improve the noise reduction ability of the vector median filter and protect the image details at the same time.

[0036] First take an n×n window (n can be 3, 5, 7, 9, 11, etc.), let X i =(R i ,G i ,B i ), (i=1,2,...,N; N=n×n) represent the pixel vector of the pixel in the window. figure 1 Indicates a 5×5 filter window, and the numbers in the figure represent the n...

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Abstract

The invention relates to the technical field of digital image processing, in particular to a switch weighting vector median filter method utilizing edge detection. The switch weighting vector median filter method improves noise reduction capacity vector median filter, and protects image details. According to the technical scheme, the switch weighting vector median filter method comprises the following steps that the similarity of pixel points in a noise image are compared with that of the corresponding pixel points in a reference image obtained through scalar median filter which is carried out on R, G and B components of the noise image, so that noise monitoring is carried out, vector median filter is carried out on suspected noise points through the weighting method based on edge detection, the noise reduction capacity of vector median filter is improved, and the image tails are protected. The switch weighting vector median filter method is mainly applied to digital image processing.

Description

technical field [0001] The invention relates to the technical field of digital image processing, in particular to a switch weighted vector median filter method using edge detection. Background technique [0002] Scalar median filter replaces the center pixel of the window with the median of the gray value of each pixel in a given window to eliminate the gray image vector median filter (vector median filter, VMF) algorithm is often used to eliminate the pulse generated in the color image noise. Treat the R (red), G (green), and B (blue) data of each pixel as a vector. For a window of a given size, calculate the sum of the Euclidean distances between each pixel and other pixels, and then The results are sorted, and the pixel vector corresponding to the smallest value is output. The vector median filter can effectively reduce the noise in the color image, and will not introduce the color that does not exist in the image, so it is widely used in various digital image processin...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T7/00
Inventor 史再峰王磊姚素英徐江涛高静
Owner TIANJIN UNIV
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