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Electrical tomography method and system based on robust principal component analysis

A technology of electrical tomography and principal component analysis, which is applied in the field of image processing, can solve the problems that the image cannot be restored, and the image quality and material distribution cannot be guaranteed at the same time, so as to achieve accurate process parameters, overcome the interference of environmental noise, and reduce the image quality. noise effect

Inactive Publication Date: 2016-12-14
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Traditional denoising methods such as averaging and filtering remove a large part of the time-varying material distribution information while improving image quality, and cannot guarantee image quality and time-varying material distribution information at the same time.
In addition, for images that are severely disturbed by noise and cannot be reconstructed, traditional methods cannot restore the frame of the image based on the information of the previous and subsequent frames.

Method used

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  • Electrical tomography method and system based on robust principal component analysis

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Embodiment 1

[0035] figure 1 It is a flowchart of an electrical tomography imaging method according to a specific embodiment of the present invention.

[0036] The process is as follows:

[0037] (1). For different measurement objects, the voltage measurement data of the electrical capacitance tomography sensor is collected.

[0038] (2). Using the linear back projection (LBP) image reconstruction algorithm and the collected voltage data for image reconstruction, the material distribution image that changes continuously with time is obtained.

[0039] (3). Convert each frame of image into a column vector, and accumulate multiple frames of images into an image matrix.

[0040] (4). The image matrix is ​​used as input, and the Alternating Direction Method of Multipliers (ADMM) is used to perform robust principal component analysis to obtain low-rank images and sparse noise.

[0041] figure 1 In the process of constructing the image matrix, you can select an image with a fixed number of f...

Embodiment 2

[0043]It is the same as that of Embodiment 1, except that in step (4), an iterative soft threshold (Iterative Soft-Thresholding, IST) method is used to perform robust principal component analysis.

Embodiment 3

[0045] The same as the embodiment 1, the only difference is that in step (4), the robust principal component analysis is performed by using the Accelerated Proximal Gradient (APG) method.

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Abstract

The invention relates to an electrical tomography method based on robust principal component analysis, which comprises the steps of acquiring measurement data of a tomography system in a region to be imaged; carrying out image reconstruction by using an image reconstruction algorithm and the acquired measurement data so as to acquire an electrical parameter distribution image of a substance which continuously changes along with the time; and carrying out robust principal component analysis on the electrical parameter distribution image of the continuously changing substance so as to acquire an image with noises being removed. Through introducing robust principal component analysis into the electrical tomography method, image noises are reduced, and the image quality is improved. The electrical tomography method can be applied to the fields of energy resources, medicines and chemical engineering.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an electrical tomography method based on robust principal component analysis and an electrical tomography system based on robust principal component analysis. Background technique [0002] Electrical tomography technology is to reconstruct the two-phase or multi-phase material distribution of the measured cross-section or area through the change of the measured quantity caused by the change of the electrical parameters of the measured material. According to the different electrical parameters measured, electrical tomography can be divided into electrical resistance tomography (Electrical Resistance Tomography, ERT, measuring the conductivity of substances), electrical capacitance tomography (Electrical Capacitance Tomography, ECT, measuring the dielectric constant of substances) , Impedance tomography (ElectricalImpedance Tomography, EIT, measurement of material conductivity and p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T11/00
CPCG06T11/003
Inventor 叶佳敏吴蒙王海刚
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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