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Method for testing three-dimensional Fourier-transform thoracico-abdominal surface measuring means
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A technology of Fourier transform and surface measurement, applied in diagnostic recording/measurement, application, medical science, etc., can solve problems such as no testing method
Inactive Publication Date: 2017-06-30
HARBIN UNIV OF SCI & TECH
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[0005] In order to preliminarily verify the effectiveness of this method, it is necessary to conduct a preliminary test on this method before the experiment, but since this method was proposed for the first time by this research group, there is no existing test method for this method
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specific Embodiment 1
[0041] A method for testing the three-dimensional Fourier transform chest and abdomen surface measurement method of this embodiment, the flow chart is as follows figure 1 As shown, the method includes the following steps:
[0042] Step a. For the fringe patterns captured at different times, establish a fringe pattern sequence intensity function model
[0043]
[0044] Among them, a(x,y,t) is the background light intensity, b(x,y,t) is the fringe modulation degree, f x0 is the carrier frequency of the spatial two-dimensional variable x, f y0 is the carrier frequency of the spatial two-dimensional variable y, f t0 is the carrier frequency of the time dimension variable t, is the phase distribution function;
[0047] Among them, K is the noise intensity, N p It is the percentage of adding noise interference, rand() m...
specific Embodiment 2
[0059] The method of the present invention is exemplified below by taking specific experimental data as an example.
[0060] In order to verify the method in this paper, a simulation experiment is carried out using a stripe pattern sequence. A sequence of 200 fringe patterns with a fringe frequency of 1 / 35 and each phase shift of 2π / 20 is used. The space size of the simulated stripe pattern is 768pixel×768pixel, and the mathematical description of the stripe pattern sequence is:
[0061]
[0062] In the formula, πx / p represents the carrier phase along the x direction, the value of p is 35, and N=1, 2, 3...,200.
[0063] Convert the above mathematical description into the form of a graph for display, and obtain the stripe pattern sequence as figure 2 shown.
[0064] In order to compare the wrap phase extraction error of 3D-FFA method with 2D-FFA method and 1D-FFA method, the figure 2 Take the fringe pattern in one frame as an example, use three Fourier fringe analysis ...
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Abstract
The invention relates to a method for testing a three-dimensional Fourier-transform thoracico-abdominal surface measuring means, which belongs to the technical field of structured light three-dimensional measurement. The method comprises the following steps: firstly, establishing a stripe pattern sequenceintensity function model for stripe patterns photographed at different moments, adding an interference signal onto the stripe pattern sequenceintensity function model, respectively performing one-dimensional, two-dimensional and three-dimensional operations on the model without noise and with added noise, and comparing three obtained phase errors. The method for testing the three-dimensional Fourier-transform thoracico-abdominal surface measuring means can clearly display difference of results of the three-dimensional Fourier-transform thoracico-abdominal surface measuring method proposed by the research group compared to the traditional 1D-FFA and 2D-FFA.
Description
technical field [0001] The invention relates to a method for testing a three-dimensional Fourier transform chest and abdomensurface measurement means, belonging to the technical field of structured light three-dimensional measurement. Background technique [0002] The three-dimensional motion measurement of the human chest and abdomen surface has important application prospects in the field of medical analysis, such as inferring tumor motion through the chest and abdomen surface respiratory motion, providing a basis for precise radiotherapy, etc. At present, the optical measurement method is recognized as the most practical and potential solution. Among them, Fourier transform profilometry only needs a deformed fringe pattern to obtain the height information of the surface of the measured object, which is most suitable for dynamic measurement of simple flat surfaces such as the surface of the human chest and abdomen. However, due to the existence of spectrum leakage and al...
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