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A high-resolution electrical tomography conductivity distribution reconstruction method

A high-resolution technology of electrical tomography, which is applied in the generation of 2D images, image data processing, and image-to-image conversion, can solve the problems of less research on data fidelity and the need to improve image resolution, and achieve the goal of overcoming Edge over-smooth effect, extended application range, improved applicability and ease of use

Active Publication Date: 2019-06-21
HENAN NORMAL UNIV
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Problems solved by technology

However, the resolution of the image still needs to be improved
In addition, most of these methods focus on the study of the penalty term, and less research is done on the data fidelity term in the process of improving the reconstructed image quality.

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  • A high-resolution electrical tomography conductivity distribution reconstruction method
  • A high-resolution electrical tomography conductivity distribution reconstruction method
  • A high-resolution electrical tomography conductivity distribution reconstruction method

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Embodiment Construction

[0025] The high-resolution electrical tomography conductivity distribution reconstruction method provided by the present invention will be described in detail with reference to the accompanying drawings and embodiments.

[0026] The high-resolution electrical tomography conductivity distribution reconstruction method of the present invention is based on total variation regularization, aiming at the problem of low resolution of traditional total variation regularization images, using weighting matrix in the iterative process The constant updating of the data fidelity term of the total variation regularization is used to control the data fidelity term of the total variational regularization. The method of automatically selecting the threshold value in the weighting matrix is ​​used to ensure the accuracy and speed of the solution. At the same time, a scale factor is set to control the weight of the weighting matrix. The final inverse problem is solved iteratively.

[0027] like ...

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Abstract

The invention discloses a high-resolution electrical tomography conductivity distribution reconstruction method. According to the method, a weighting matrix is adopted to control a data fidelity item;a method for automatically selecting a threshold value in a weighting matrix is provided to ensure the solving accuracy and speed, meanwhile, a scale factor is set to control the weight of the weighting moment, the method is suitable for electrical tomography, an electrical tomography problem is regarded as solving a linear uncertain problem, and an objective function is determined; The method comprises the following steps: obtaining a relative boundary measurement value vector and a sensitivity matrix required by reconstruction according to a measured field domain; Setting initialization parameters; Calculating a gradient and a Hessian matrix of the objective function; Updating the value of the solution by using a Gauss-Newton iteration method; Judging whether iteration is finished or not; And performing imaging according to the finally solved imaging gray value. According to the invention, the quality and image resolution of an electrical tomography reconstructed image are effectively improved, the complexity of the algorithm is simplified, and the applicability of the algorithm is enhanced.

Description

technical field [0001] The invention belongs to the technical field of electrical tomography, and in particular relates to a high-resolution method for reconstructing conductivity distribution of electrical tomography. Background technique [0002] Electrical tomography (ET) appeared in the late 1980s and is a process tomography technology based on a sensitive mechanism of electrical characteristics. Dielectric coefficient / complex admittance / permeability) distribution information is imaged, and then the distribution information of the medium is obtained. Electrical tomography techniques mainly include electrical resistance tomography (ERT), electrical capacitance tomography (ECT), electrical impedance tomography (Electrical Impedance Tomography, EIT) and electromagnetic tomography (Electrical Magnetic Tomography, EMT). Electrical tomography has broad application prospects in the fields of multiphase flow, geological exploration and medical imaging. It can realize long-term...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/40G06T11/00
Inventor 施艳艳饶祖广王萌刘伟娜
Owner HENAN NORMAL UNIV
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