Salt and pepper noise filtering method based on color image

Abstract

The invention discloses a salt and pepper noise filtering method based on a color image, relating to the image processing field. In the method, based on a vector median filter for detecting a gradual switch median, a vector median filtering method is utilized to effectively inhibit the pulse noise, and the advantages of the gradual switch median detection method are combined to effectively eliminate the noise and synchronously avoid blurring of the image details; the gradual way is firstly reflected in that the detecting process of each iteration is performed based on the result of previous detection; with respect to a color image with high contaminating rate, densely distributed noise can be gradually detected one by one through the iteration process and is avoided being remained by regarding the noise as the real information of the image; the iteration process prevents the small noise which are densely distributed originally from gathering to be a large noise area; and the filteringprocess is used for filtering the noise based on the previous detecting results.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a salt and pepper noise filtering method based on color images. Background technique [0002] Color images are easily polluted by impulse noise during acquisition and transmission. In order to eliminate the impact of impulse noise, scientists have proposed many filters for impulse noise, among which the vector median filter and many methods based on vector sorting can effectively eliminate impulse noise. However, this type of filter filters all the noise in the image indiscriminately, so that the pixels that are not noise are modified, and the original structural information of the image is changed, resulting in the blurring of image details. Contents of the invention [0003] In order to avoid all the noises in the image being filtered without distinction, the pixels that are not noises are modified, the original structural information of the image is changed, and the details ...

AI Technical Summary

Problems solved by technology

However, this type of filter filters all the noise in the image indiscriminately, so that the original non-noise pixels are modified, and the original structural information of the image changes, resulting in blurred image details.

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