Magic square coding-based median filter method

A magic square and encoding technology, which is applied in image data processing, instrumentation, calculation, etc., can solve problems such as large amount of calculation, large consumption of time and resources, etc.

Inactive Publication Date: 2010-12-08
HEBEI NORMAL UNIV
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Problems solved by technology

This method has the problem of large amount of calculation, which consumes a lot of time and resources

Method used

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  • Magic square coding-based median filter method
  • Magic square coding-based median filter method
  • Magic square coding-based median filter method

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Embodiment Construction

[0043] For the processing flow of the median filtering method based on magic square coding, see figure 1 and figure 2 , which is processed as follows:

[0044] Step 101, read and store the coordinates and gray value of each pixel in the image.

[0045] In this step, the storage method can be the same as the prior art, and can be stored in the function f(x, y), and the gray value of each pixel is stored correspondingly to the coordinate value.

[0046] Step 102, take the image block of (2N+1)×(2N+1) centered on the pixel to be processed as a processing unit, encode the position of the pixel in the processing unit according to the magic square, and obtain the magic square The square encoding sequence is {p 1，1 ,p 1，2 ,...,p 2N+1，2N ,p 2N+1，2N+1}, the gray value sequence corresponding to the magic square encoding sequence is {a 1，1 , a 1，2 ,...,a 2N+1，2N , a 2N+1，2N+1}, where N is a natural number, p i，j Encoding the magic square at position (i, j), a i，j is the gray...

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Abstract

The invention discloses a magic square coding-based median filter method comprising the following steps of: firstly, reading the coordinates and the gray value of each pixel in an image; secondly, traversing the image and judging whether each pixel is a noise pixel or positioned in a linear detail area or not by using a magic square coding-based method; and thirdly, maintaining the gray value of a non-noise image unchanged and removing the noise of the noise pixel by amending the gray value of the noise pixel. The invention can be used for judging whether the pixel processed as the noise pixel is positioned in the linear detail area or not without generating pixel loss in the linear detail area, thereby ensuring the integrity of image information; the pixels in the linear detail area are judged by using the magic square coding-based method with small calculated quantity; and a proper value is selected to replace the noise pixel according to the difference condition between the gray median value and the mean value of the maximum gray value and the minimum gray value so as to reduce the fuzzy phenomenon caused during the the image noise removing processing.

Description

technical field [0001] The invention relates to a method for filtering image noise, in particular to a method for removing image noise by median filtering based on magic square coding technology. Background technique [0002] Studies have shown that the visual image information obtained by humans accounts for three quarters of the information received by humans, and it is an important means for humans to obtain, express and transmit information. However, in the process of image generation, transmission or transformation, due to the imperfection of the image acquisition system, transmission medium or imaging system, different degrees of noise will be introduced, thereby degrading the quality of the output image. Since the success or failure of many subsequent image processing (such as edge detection, pattern recognition, or image segmentation, etc.) depends to a large extent on the effect and quality of noise removal, in the field of digital image processing, image noise filt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 张有会王志巍赵金霍利岭杨会云杨芳芳
Owner HEBEI NORMAL UNIV
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