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Median filtering method and device

A median and median technology, applied in the field of median filtering methods and devices, can solve the problems of easy loss of image details, diffuse image edges and noise, etc., so as to maintain and optimize image edges, denoising capabilities and edge retention capabilities. , the effect of good image edges

Active Publication Date: 2019-12-20
BEIJING HUAJIE IMI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the filters used in traditional multi-image filtering methods such as joint bilateral filtering and guided filtering have smooth characteristics, which are easy to lose image details and diffuse image edges and noise.

Method used

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  • Median filtering method and device
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  • Median filtering method and device

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Embodiment 1

[0071] In the embodiment of the present invention, the value of T in formula 10 is 0, which is equivalent to that the weighted summation result is equal to the median value of the pixel values ​​of the first category corresponding to the median value of the weight value of the second category.

[0072] The embodiment of the present invention is the application of the present invention in depth map filtering enhancement, and the resolution of the input image is 121×166. The filtering process uses a fixed 9×9 window neighborhood. When the value of ε is 5, the similarity value of the second type of pixel value is calculated by formula 1. When the value of λ is 0.05, the pixel distance attenuation factor is calculated by formula 4. Use Formula 5 to calculate the second-type weight of each pixel in the neighborhood. When α is 0.5, use Formula 6 to calculate the median value of the second-type weight. When T is 0, use Formula 7 to calculate the weight For the summation value, when t...

Embodiment 2

[0075] The embodiment of the present invention is an application example of the present invention on one-dimensional digital baseband signal filtering, and the sampling length of the input image is 200. The filtering process uses a 1×9 fixed window neighborhood. When the value of ε is 0.02, the similarity value of the second type of pixel value is calculated by formula 1. When the value of λ is 0, the pixel distance attenuation factor is calculated by formula 4. Formula 5 calculates the second-type weight of each pixel in the neighborhood. When α is 0.5, use formula 6 to calculate the median value of the second-type weight. When T is 0.2, use formula 7 to calculate the weighted value and value, when the value of σ is 0.1, formula 8 is used to calculate the first type weight value of each pixel in the neighborhood, and formula 9 is used to calculate the first type pixel value filter output.

[0076] In the embodiment of the present invention, such as figure 2 As shown, the id...

Embodiment 3

[0078] The embodiment of the present invention is an application example of the present invention in image fusion, and the input image is a 512×512 resolution, 3-channel RGB color image. The filtering process adopts a fixed 17×17 window neighborhood. When the value of ε is 0.03, the similarity value of the second type of pixel value is calculated by formula 1. When the value of λ is 0, the pixel distance attenuation factor is calculated by formula 4. Use Formula 5 to calculate the second-type weight of each pixel in the neighborhood. When α is 0.5, use Formula 6 to calculate the median value of the second-type weight. When T is 0, use Formula 7 to calculate the weight For the summation value, when the value of σ is 0.1, formula 8 is used to calculate the first-type weight value of each pixel in the neighborhood, and formula 9 is used to calculate the first-type pixel value filter output. The three channels of the image are filtered separately.

[0079]The ideal output image i...

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Abstract

A median filtering method and device, the method includes: calculating the first type of pixel value similarity and distance attenuation factor value between neighbor pixels and central pixels in the first image; according to the first type of pixel value similarity and distance attenuation The factor value calculates the median value of the first type of weight value of the neighborhood pixel; finds the median value of the second type of pixel value corresponding to the median value of the first type of weight value; converts the second type of pixel value of the neighborhood pixel in the second image. The second pixel values ​​of some pixels in the class pixel values ​​that are close to the median value of the second class pixel value are weighted and summed to obtain a weighted summation value. The median filtering method and device provided by the present invention combine the first image to perform weighted median filtering on the second image. Compared with the traditional multi-image filtering method, this method can better maintain and optimize the image edges without causing edge blur. and noise diffusion effect; at the same time, the denoising ability and edge preservation ability are better than the traditional single image filtering method.

Description

technical field [0001] The invention relates to stereo vision processing technology, in particular to a median filtering method and device. Background technique [0002] Image filtering methods can be divided into two categories according to the processed objects: one is single-image filtering methods, such as mean filtering, median filtering, bilateral filtering, etc.; the other is multi-image filtering methods, such as joint bilateral filtering and guided filtering. filtering etc. The processing object of the single-image filtering method is a single image, and the auxiliary information of other images such as guide images cannot be used. Therefore, when there are guide images, its filtering ability is limited. Since the multi-image filtering method uses the information of the guide image, its denoising ability and edge preservation ability are generally better than the single-image filtering method. [0003] Most of the filters used in traditional multi-image filtering ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T2207/20032G06T5/73G06T5/70
Inventor 王行李骊盛赞周晓军李朔杨淼
Owner BEIJING HUAJIE IMI TECH CO LTD
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