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Method for lowering noise of medical sonogram anisotropic diffusion

An anisotropic, ultrasonic image technology, applied in the field of medical ultrasonic image processing, can solve problems such as difficult selection of scale, limited processing effect, sensitive window selection, etc.

Active Publication Date: 2007-11-21
SONOSCAPE MEDICAL CORP
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Problems solved by technology

The method based on median filtering automatically selects the weights of each point in the filtering window and the size and shape of the window according to the local statistical characteristics of the image. The choice of is very sensitive, which limits the processing effect
The method based on wavelet transform transforms the ultrasonic image into the wavelet domain, uses wavelet thresholding to discard some coefficients, and then inversely transforms them to remove noise, but it is difficult to choose a suitable scale in this method

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  • Method for lowering noise of medical sonogram anisotropic diffusion
  • Method for lowering noise of medical sonogram anisotropic diffusion
  • Method for lowering noise of medical sonogram anisotropic diffusion

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with accompanying drawing:

[0044] Referring to FIG. 5 , the steps of this embodiment are as follows: the first step is to calculate the edge reliability of each pixel, and thus determine the diffusion parameter value of each pixel. The second step is the anisotropic diffusion algorithm for noise reduction. The third step is to calculate I x，y t+1 and I x，y t The nonlinear correlation coefficient of , if it is greater than the specified value, stop, otherwise go to the second step.

[0045] 1, the K and λ of the diffusion method based on the present invention and the anisotropic diffusion algorithm are the same, the parameters of the diffusion algorithm are set to K=30, λ=0.15, and the threshold value of the nonlinear correlation coefficient is 0.61. Because the edge reliability is not sensitive to noise, the edge reliability is only calculated at the beginning of the diffusion algorithm, and is ...

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Abstract

A method for decreasing noise of anisotropic diffusion on medical ultrasonic image includes confirming diffusion level according to gradient and diffusion parameter of pixel and updating grey scale of pixel simultaneously, calculating nonlinear correlation coefficient of this image diffusion noise-decreasing result to image being not diffused and ending image noise-decreasing treatment if said coefficient is less than assigned value or otherwise confirming diffusion level according to new gradient and diffusion parameter of pixel and updating grey scale of pixel till nonlinear correlation coefficient of adjacent two times of image is less than assigned value.

Description

(1) Technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a medical ultrasonic image processing technology. (2) Background technology [0002] In medical ultrasound imaging, the speckle noise caused by superposition of coherent waves has a serious impact on ultrasound images, which reduces the ability of the ultrasound imaging system to distinguish objects, affects people's understanding of images and the detection and extraction of automatic features, and limits medical imaging. Further application of ultrasound images in clinical diagnosis. Noise reduction processing for ultrasound images is an important part of medical ultrasound image processing. Ultrasound image noise reduction algorithm should effectively suppress speckle noise while retaining image detail information useful for later analysis and diagnosis. [0003] Image noise reduction techniques are generally divided into two categories: spatial doma...

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Application Information

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IPC IPC(8): G06T5/00A61B8/00
Inventor 沈毅芦蓉
Owner SONOSCAPE MEDICAL CORP
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