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A vector filtering method of double-threshold type color image

A color image and vector filtering technology, which is applied in image enhancement, image data processing, instruments, etc., can solve problems such as image blur and noise, and achieve the effect of reducing the possibility of wrongly changing the pixels of the original image

Inactive Publication Date: 2009-09-30
GUANGDONG UNIV OF TECH
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Problems solved by technology

However, the above methods may cause blurring of the filtered image, and some details are misjudged as noise and removed.

Method used

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  • A vector filtering method of double-threshold type color image
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  • A vector filtering method of double-threshold type color image

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[0014] The main idea of ​​this method is to first judge whether the current point in the filtering window is impulse noise, if so, select the vector with the smallest output order; if not, keep the original pixel content unchanged. Do this for all the points in the graph in turn. like figure 2 , a specific embodiment of this method is as follows:

[0015] Step S201: take the current point x c The pixels within the filtering window size N of , form a set of filtering vectors W={x 1 ,...,x c ,...x N};

[0016] Step S202: Calculate the mutual distance according to the Euclidean distance of the pixel vector, D(i, j)=‖x i -x j ‖, if the vector is a ternary vector, such as a vector in common color spaces such as RGB and HSV, the Euclidean distance can be used | | x i - x j | | = ( x ...

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Abstract

The invention discloses a vector filtering method of double-threshold type color image, aiming at de-noising of the pulse-type noises in the color image. The method judges if the pixel is noise according to the sorting value of the center pixel in the neighboring widow and the distance between the original pixel and the ranked first pixel. If that is noise, then the ranked first pixel is output, or, the original pixel value is output. Every point of the image is treated by the above operation. The method can be used in de-noising of static image or dynamic video.

Description

technical field [0001] The invention relates to a filtering method for an image system, in particular to a double-threshold switching type color image vector filtering method. Background technique [0002] In the acquisition and transmission process of the image system, there will always be various kinds of noises that cause the image quality to decline. Impulse noise is a more common noise. Different from grayscale images, a multi-channel numerical representation of color is used in color image systems. For example: RGB and HSV color spaces use three components to represent different channel components respectively. Nonlinear Vector Median Filters (VMF) have received extensive attention because they have shown good denoising capabilities, see Astola J, Haavisto P, Neuvo Y. Vector MedianFilters.In: Proc.IEEE.1990, 78 (4): 678-689. It treats the multi-channel value of the pixel as a vector in the color space. In the filter design work, how to strike a balance between fil...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 钟灵章云
Owner GUANGDONG UNIV OF TECH
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