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Hybrid high-order variation ultrasonic image denoising method based on Weibull distribution

An ultrasound image, high-level technology, applied in the field of image processing, can solve the problems of unsatisfactory denoising effect and high complexity of denoising algorithm

Pending Publication Date: 2020-10-23
CHINA THREE GORGES UNIV
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Problems solved by technology

Some of these methods have unsatisfactory denoising effects, and some denoising algorithms have high complexity.

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  • Hybrid high-order variation ultrasonic image denoising method based on Weibull distribution
  • Hybrid high-order variation ultrasonic image denoising method based on Weibull distribution
  • Hybrid high-order variation ultrasonic image denoising method based on Weibull distribution

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Embodiment Construction

[0029] A hybrid high-order variational ultrasound image denoising method based on Weibull distribution, comprising the following steps:

[0030] Step 1: Fit the noise distribution of the ultrasound image, use the Weibull probability density function to fit the gray histogram of the selected local uniform area of ​​the image, and estimate the fitting distribution parameters using the maximum likelihood method.

[0031] In the step 1, the real noise-free image v is disturbed by the multiplicative noise n to generate the observed ultrasonic image f, and satisfies the ultrasonic image imaging model f=vn, wherein the multiplicative noise n is in the local grayscale of the image The uniform area is approximately Weibull distribution, that is, the probability density function of the noise satisfies:

[0032]

[0033] Among them, exp() is an exponential function; λ and k are the scale parameters and shape parameters of the Weibull distribution, respectively, and the local uniform g...

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Abstract

The invention discloses a hybrid high-order variation ultrasonic image denoising method based on Weibull distribution, and the method comprises the steps of carrying out the noise distribution fittingof an ultrasonic image, carrying out the gray histogram fitting of a selected image local uniform region through employing a Weibull probability density function, and carrying out the estimation of afitting distribution parameter through employing a maximum likelihood method; deducing a likelihood function of the logarithm real noiseless image according to the fitted noise distribution, and performing negative logarithm transformation on the likelihood function to obtain a data fidelity term of the minimized energy function; performing weighted fusion on the first-order regularization expression and the second-order regularization expression of the logarithmic real noiseless image, and constructing a mixed high-order regularization term of a minimized energy function; and enabling the data fidelity term and the mixed high-order regularization term to form a minimized energy function model, using a Spit-Bregman iterative method to perform rapid solution, and after iterative convergence, exponential transformation is utilized to obtain a denoised ultrasonic image. According to the method, speckle noise can be effectively reduced, and details and edge information of the image can bebetter reserved, so that the visual interpretation of the ultrasonic image is enhanced.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a hybrid high-order variational ultrasonic image denoising method based on Weibull distribution. Background technique [0002] At present, ultrasound imaging has become the first choice for clinical diagnosis of various diseases, and has developed into a series of diagnostic techniques that can provide a variety of parameters. Ultrasound imaging methods are often used to judge the location, size, and shape of organs, determine the scope and physical properties of lesions, provide anatomical maps of some glandular tissues, and identify normal and abnormal fetuses. , The application of the urinary system is very extensive. Ultrasound imaging adopts the principle of echo. The probe of the instrument emits a beam of ultrasound into the human body, and performs linear, fan-shaped or other forms of scanning. When encountering the interface of two tissues with different acoust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10132G06T5/70
Inventor 崔文超邵良志徐德伟孙水发吴义熔
Owner CHINA THREE GORGES UNIV
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