Method and device for image denoising

An image and image block technology, applied in the field of image processing, can solve problems such as image smearing

Active Publication Date: 2020-07-03
SPREADTRUM COMM (TIANJIN) INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem solved by the present invention is how to avoid the smearing phenomenon of the image after denoising while ensuring the noise denoising effect

Method used

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  • Method and device for image denoising
  • Method and device for image denoising
  • Method and device for image denoising

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Embodiment Construction

[0102] In order to filter out color noise, at present, when using IIR, denoising is performed through the following steps: according to the horizontal and vertical edge information of the image block, the variance, and the center pixel of the image block and the pixel selected in the previous row or column The difference of the chrominance components is used to judge whether the image block is a flat area. When the image block is a flat area, according to the brightness of the image block and the difference between the chrominance components of the central pixel of the image block and its surrounding pixels, determine the filtering strength of the image block, and then use the The filter strength filters the image block.

[0103] However, if the above method is used for image denoising processing, if the filtering intensity is not well controlled, smearing will occur while removing noise. Taking color noise as an example, this kind of tailing is manifested by the color draggi...

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Abstract

A method and device for image denoising, performing recursive filtering on the pixels in the image, and obtaining the filtering strength of the current pixel to be processed by the following method: calculating the edge information on the horizontal and vertical chrominance components of the central pixel, Take the maximum value as the maximum value of the first edge information; calculate the variance of the image block; calculate the center pixel and the filtered pixel selected in the k-1th row / k-1th column in the image block Calculate the edge information on the luminance component of the central pixel; judge whether the frequency region where the central pixel is located is a flat region; when the frequency region where the central pixel is located is a flat region, calculate The current brightness of the center pixel; according to the current brightness, acquire a first filter strength as the filter strength of the center pixel. By adopting the above scheme, the smearing phenomenon of the image after denoising can be avoided while ensuring the denoising effect of the noise.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image denoising method and device. Background technique [0002] Whether it is a digital camera, a mobile phone camera, or a computer camera, in the process of image collection, it will be more or less disturbed by color noise. Generally speaking, in order to suppress color noise, the most common method is to design a filter to filter it out. For the high-frequency characteristics of color noise, a series of low-pass filters are usually designed to suppress it. This type of filter uses a template of a certain size. In order to effectively remove color noise with a lower frequency, a larger template is often used, and a recursive filter (Infinite Impulse Response, IIR) is often used to simulate the denoising function of a larger template due to its unique transfer characteristics. [0003] In order to filter out color noise, at present, when using IIR, the following steps are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/002
Inventor 王微
Owner SPREADTRUM COMM (TIANJIN) INC
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