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

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...

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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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