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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 possible effect of wrongly changing the pixels of the original image

Inactive Publication Date: 2011-04-13
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
  • A vector filtering method of double-threshold type color image
  • 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 filter window is impulse noise, if so, select the vector with the smallest output order; if not, keep the original pixel content unchanged. Perform the above operations on all points in the graph in turn. Such as figure 2 , a specific implementation of the method is as follows:

[0015] Step S201: Get the current point x c The pixels within the filter window size N form a filter vector set 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, a vector in a common color space such as RGB and HSV, you can use the Euve vector distance | | x i - x j | | = ( ...

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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 dual-threshold switch type color image vector filtering method. Background technique [0002] In the acquisition and transmission process of the image system, there will always be various noises that cause the degradation of image quality. Impulse noise is a relatively common noise. Unlike grayscale images, color image systems use multi-channel numerical representations of colors. For example: RGB and HSV color spaces use three components to represent different channel components respectively. The nonlinear vector median filter (VMF) has received extensive attention because of its good denoising ability, see Astola J, Haavisto P, Neuvo Y.Vector MedianFilters.In:Proc.IEEE.1990,78 (4): 678-689. It treats the multi-channel values ​​of pixels uniformly as vectors in the color space. In the design of filtering, how to strike a balance between filtering out noise and ret...

Claims

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Application Information

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