Shearlet transform and fast bilateral filter image denoising method

A bilateral filter and image technology, applied in the field of medical ultrasound image denoising, can solve problems such as difficult to promote data space for excellent performance

Inactive Publication Date: 2016-11-16
ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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  • Application Information

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Problems solved by technology

Wavelet analysis lays the foundation for the sparseness of signals and images. Wavelet transform can optimally approximate the zero-Vitch heterogeneity, but its excellent performance is difficult to

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  • Shearlet transform and fast bilateral filter image denoising method

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Embodiment 1

[0069] Such as figure 1 As shown, a kind of shearlet transform and fast bilateral filter image denoising method of the present embodiment, such as figure 1 shown, including the following steps:

[0070] 1) Utilize the noise imaging system to collect the envelope signal of the noise image, and establish a medical ultrasound image model through logarithmic transformation; obtain the two-dimensional discrete shearlet coefficient after the two-dimensional discrete shearlet transformation, and the two-dimensional discrete shearlet coefficient includes noise-free Image two-dimensional discrete shearlet coefficient and speckle noise image two-dimensional discrete shearlet coefficient;

[0071] 2) the medical ultrasound image model after the logarithmic transformation obtained in the step 1) utilizes a pyramid filter bank to carry out multi-scale and multi-directional decomposition, and obtains k+1 subband images equal in size to the medical ultrasound image model, so Described sub-...

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Abstract

The invention discloses a shearlet transform and fast bilateral filter image denoising method, comprising the following steps: 1) using a noise imaging system to collect the envelope signal of a noise image, and establishing a medical ultrasonic image model; 2) performing the step 1 ) The medical ultrasound image model obtained after the logarithmic transformation utilizes a pyramid filter bank to perform multi-scale and multi-directional decomposition, 3) the two-dimensional discrete shearlet transformation coefficient of the high-frequency part in each sub-band image obtained in the step 2) Carry out threshold method contraction processing; 4) Utilize fast bilateral filter to carry out filter processing to the shearlet coefficient of step 2) middle and low frequency part; 5) Perform shearlet inverse transformation processing to all coefficients after step 3) and step 4) processing, obtain Noised medical ultrasound images. The introduction of the fast bilateral filter in the present invention can not only improve the denoising performance but also greatly improve the processing efficiency.

Description

technical field [0001] The invention relates to a shearlet transform and a fast bilateral filter image denoising method. The invention belongs to the field of denoising of medical ultrasound images, and in particular refers to a method of denoising the medical ultrasound images based on shearlet transformation and fast bilateral filter. 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. The application of ultrasound diagnosis as a diagnostic technique in medical diagnosis began in 1972 with the advent of grayscale ultrasound. Especially in recent years, ultrasound diagnosis has been widely used in medical clinical diagnosis, especially in the observation of fetal growth in pregnant women and In clinical applications such as the diagnosis of abdominal organ lesions, the use of ultrasound imaging technology is more important. [0003] However, in the clin...

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/002G06T2207/10132G06T2207/20016G06T2207/20028G06T2207/20048G06T2207/20056G06T2207/20192G06T2207/30004
Inventor 张聚程义平刘敏超柴金良
Owner ZHEJIANG COLLEGE OF ZHEJIANG UNIV OF TECHOLOGY
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