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Filtering method

A pixel and template technology, applied in image data processing, instruments, calculations, etc., can solve problems such as insufficient filtering effect

Pending Publication Date: 2021-03-26
SHANGHAI GMT DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing judgment conditions are set based on experience, resulting in the filtering effect not being stable enough, sometimes good and sometimes bad

Method used

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Embodiment Construction

[0039] In order to make the purpose, advantages and features of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in very simplified form and not drawn to scale, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention. In addition, the structures shown in the drawings are often a part of the actual structure. In particular, each drawing needs to display different emphases, and sometimes uses different scales. It should also be understood that, unless otherwise specified or pointed out, the terms “first”, “second”, “third” and other descriptions in the specification are only used to distinguish each component, element, step, etc. in the specification, rather than It is used to express the logical relationship or sequence relationship between various compo...

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Abstract

The invention provides a filtering method. The filtering method comprises the following steps: selecting a first template by taking a pixel to be filtered as a center; setting a threshold value according to the noise intensity near the pixel to be filtered; selecting a search area by taking the to-be-filtered pixel as a center; executing the following steps on each to-be-judged pixel in the searcharea: selecting a second template by taking the to-be-judged pixel as a center; calculating a template distance between the to-be-judged pixel and the to-be-filtered pixel; if the template distance is smaller than or equal to the threshold value, determining that the to-be-determined pixel is the same kind of pixel of the to-be-filtered pixel, and adding the to-be-determined pixel into the same kind of pixel set; and calculating an average value of pixel values of all pixels in the same pixel set, and taking the average value as a filtered value of the to-be-filtered pixel. By setting the threshold value according to the noise intensity, the pixels with the same true value can be more accurately judged as the pixels of the same kind, the average value of all the pixels of the same kind istaken as the pixel value of the pixel to be filtered after filtering, and a better filtering effect can be achieved.

Description

technical field [0001] The invention relates to the technical field of video image filtering, in particular to a filtering method under the condition of known noise intensity. Background technique [0002] Most of the existing filtering technologies do not consider the strength of the noise, but only achieve the filtering effect by designing a suitable filter. However, the intensity of noise in different videos and images is not the same, the general filtering method is not targeted, and there is still room for improvement in the filtering effect of specific videos and images. [0003] In recent years, the filtering method based on template matching has achieved good results. Its core idea is to take a template around a pixel. The template contains several template pixels. By comparing the templates of two pixels, it is judged whether the two pixels belong to the same type of pixels. That is, pixels with the same or very similar real values, the difference between the value...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T2207/10016G06T2207/20024G06T5/70
Inventor 赵海武王国中范涛陈勇赵东方
Owner SHANGHAI GMT DIGITAL TECH