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Method and system for estimating noise standard deviation

A noise standard deviation and noise technology, applied in the estimation method and system field of noise standard deviation, can solve problems such as too much noise, difficulty, uneven noise standard deviation, etc.

Active Publication Date: 2017-09-26
GENERAL ELECTRIC CO
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Problems solved by technology

It is very important to accurately estimate the noise standard deviation. If the noise standard deviation cannot be accurately estimated, the image obtained after denoising may have bad properties, such as too much noise, loss of resolution, and artifacts Wait
However, it is difficult to accurately estimate the standard deviation because the noise standard deviation is not uniform for different computed tomography (CT) images

Method used

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  • Method and system for estimating noise standard deviation
  • Method and system for estimating noise standard deviation
  • Method and system for estimating noise standard deviation

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[0015] Approximate language used herein may be used in quantitative terms, indicating that certain variations in quantities are permissible without changing essential function. Accordingly, values ​​modified by language such as "about", "approximately" and the like are not limited to the exact value itself. In some embodiments, "about" or "about" means that the corrected value is allowed to vary within the range of plus or minus ten percent (10%), for example, "about 100" means that it can be between 90 and 110 any value of . In addition, in the expression "about the first value to the second value", "about" modifies both the first value and the second value at the same time. In some cases, the language of approximation may relate to the precision of the measuring instrument.

[0016] Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms...

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Abstract

The present invention relates to a noise standard deviation estimation method, in which method, after receiving a noise-containing input image and filtering the input image to obtain a smooth image, taking the input image and the smooth image The difference is the original noise map. Pre-clearing the boundary in the original noise map, estimating a threshold T or threshold function Tg from the noise map with the pre-cleared boundary, then using the threshold T or threshold function Tg to determine the boundary in the original noise map, and The determined boundaries are cleaned from the original noise map, and the noise standard deviation is estimated from the boundary-cleaned noise map.

Description

technical field [0001] The present invention relates to a noise standard deviation estimation method and system, in particular to a noise standard deviation estimation method and system used in an image noise reduction algorithm. Background technique [0002] Standard deviation refers to a mathematical formula that expresses the degree to which a set of data deviates from the mean value of the set of data. Standard deviation is often used to measure and characterize noise. In the noise reduction algorithm, for example, in the non-local mean filter noise reduction algorithm, the noise standard deviation is an important parameter used to control the smoothness of the finally obtained reconstructed image. It is very important to accurately estimate the noise standard deviation. If the noise standard deviation cannot be accurately estimated, the image obtained after denoising may have bad properties, such as too much noise, loss of resolution, and artifacts Wait. However, it ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00A61B6/03G06V10/30
CPCG06T5/002G06T5/20G06T2207/10081G06T2207/20012G06T2207/20021G06T2207/20032G06T11/005G06V10/30
Inventor 闫铭范家华梅根.L.岳
Owner GENERAL ELECTRIC CO