Medical ultrasound image noise reduction method based on thresholding improved wavelet transform and guide filter

A guided filter and wavelet transform technology, applied in the field of medical ultrasound image denoising, can solve the problem of not taking into account the denoising ability and so on.

Inactive Publication Date: 2015-05-27
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0011] The present invention overcomes the shortcomings of the prior art that can not take into account both the denoising ability and the edge details of the image, and provides a medical treatment based on improved threshold wavelet transform and guided filter. Ultrasound image denoising method

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  • Medical ultrasound image noise reduction method based on thresholding improved wavelet transform and guide filter
  • Medical ultrasound image noise reduction method based on thresholding improved wavelet transform and guide filter
  • Medical ultrasound image noise reduction method based on thresholding improved wavelet transform and guide filter

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[0092] In order to make the purpose of the present invention, technical solutions and advantages clearer, the following combination Attached picture The technical solution of the present invention is further described. Such as figure 1 As shown, the medical ultrasound based on the improved threshold wavelet transform and guided filter of the present invention picture Like the denoising method, it includes the following steps:

[0093] Step 1) Set up medical ultrasound picture like model.

[0094] If it is considered that the ultrasound imaging system can make appropriate dynamic compensation for those factors that affect the acoustic power, the envelope signal collected by the ultrasound imaging system consists of two parts, one is the reflection signal of meaningful internal tissues, and the other is the noise signal . The noise signal can be divided into multiplicative noise and additive noise. Multiplicative noise is related to the principle of ultrasound signal im...

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Abstract

The invention relates to a medical ultrasound image noise reduction method based on thresholding improved wavelet transform and guide filter. The medical ultrasound image noise reduction method based on thresholding improved wavelet transform and guide filter comprises the following steps: step one, establishing a medical ultrasound image model; step two, carrying out wavelet decomposition on images after logarithmic transformation obtained in the first step to obtain four frequency domains (LL1, LH1, HL1 and HH1); carrying out wavelet decomposition on the low frequency domain LL1, and then obtaining four frequency domains (LL2, LH2, HL2 and HH2); then repeating the step until the maximum number of layers J is decomposed; step three, carrying out threshold value method shrinkage treatment on wavelet coefficients of high frequency parts (LHj, HLj and HHj, j is equal to 1, 2,..., J) on each layer; step four, carrying out filtering processing on wavelet coefficients of low frequency part (LLJ) on the last layer by utilizing the guide filter; step five, carrying out wavelet inverse transformation to obtain medical ultrasound images after noise reduction.

Description

technical field [0001] The invention is applied to the field of medical ultrasonic image denoising. Background technique [0002] In the field of medical imaging, imaging technologies such as ultrasound imaging, CT, and MRI have been applied in medical clinical diagnosis. Ultrasound imaging technology has become a widely used and safe medical diagnostic technology due to its non-invasive, non-radiation damage, fast and convenient characteristics. Especially in clinical applications such as observing fetal growth in pregnant women and diagnosing abdominal organ lesions, the use of ultrasound imaging technology is even more important. [0003] According to the statistics of breast cancer in women given by the American Cancer Society in 2013, in the past year, there were 232,340 new cases of breast cancer and 39,620 deaths from breast cancer in American women. The main technology for detecting human breasts and other organs of the abdomen is ultrasonic imaging technology, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 张聚林广阔吴丽丽崔文强程义平
Owner ZHEJIANG UNIV OF TECH
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