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Phase unwrapping method based on Goldstein branch cutting method

A phase unwrapping and tangential technology, applied in instruments, measuring devices, optical devices, etc., can solve the problems of generating long branch tangents and short total length of branch tangents, reducing errors and improving efficiency.

Active Publication Date: 2022-07-15
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is exactly to be aimed at the defect that " isolated island " phenomenon and generation longer branch tangent line are easily produced in Goldstein branch cutting method in the prior art, a kind of phase expansion method based on Goldstein branch cutting method is provided, can make the total length of branch tangent line reach The shortest and can eliminate the "island" phenomenon, so as to obtain better phase unwrapping results and improve the accuracy of 3D measurement

Method used

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  • Phase unwrapping method based on Goldstein branch cutting method
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  • Phase unwrapping method based on Goldstein branch cutting method

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Embodiment 1

[0066] figure 1 A preferred embodiment of the present application is shown ( figure 1 A schematic diagram of the operation flow of a phase unwrapping method based on the Goldstein branch cut method provided by the first embodiment of the present application) is shown. For the convenience of description, only the parts relevant to this embodiment are shown, and the details are as follows:

[0067] The technical scheme of the present invention includes:

[0068] Step 1, obtain a truncated phase map;

[0069] Step 2, using the Goldstein branch cut method to identify the residual points in the truncated phase map;

[0070] Step 3, construct a weighted bipartite graph;

[0071] Step 4, use the Kuhn-Munkres algorithm to find the maximum weight matching of the weighted bipartite graph;

[0072] Step 5: Construct branch tangents according to the maximum weight matching and connecting residual points;

[0073] Step 6, select the pixel points not on the branch tangent line as the s...

Embodiment 2

[0114] This embodiment provides a specific operation flow of a phase unwrapping method based on the Goldstein branch-cut method, which is specifically described below.

[0115] The schematic diagram of the Fourier transform profilometry system based on surface structured light is as follows: figure 2 shown, where P 1 and P 2 are the entrance pupil and exit pupil of the image projection system, respectively, I 1 and I 2 represent the exit pupil and entrance pupil of the image acquisition system, respectively. The optical axis of the image acquisition system is perpendicular to the reference plane, and intersects with the optical axis of the image projection system at point O on the reference plane. The height of the image projection and acquisition system from the reference plane is L, and the angle between the optical axes is θ.

[0116] The sinusoidal fringe pattern generated by computer coding is projected onto the surface of the measured object through an image project...

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Abstract

The invention relates to the technical field of object three-dimensional measurement, in particular to a phase unwrapping method based on a Goldstein branch cutting method. Obtaining a truncated phase diagram; a Goldstein branch cutting method is adopted to identify residual error points in the truncated phase diagram; constructing a weighted bipartite graph, and converting the problem of constructing the branch tangent with the shortest total length into the problem of solving the maximum weight matching of the weighted bipartite graph; a Kuhn-Munkres algorithm is used to solve the maximum weight matching of the weighted bipartite graph; according to the maximum weight matching connection residual error points, constructing branch tangent lines; and selecting a pixel point which is not on the branch tangent line as a starting point to perform phase unwrapping. The branch tangent line with the shortest total length can be constructed, and the island phenomenon can be eliminated, so that a better phase unwrapping result is obtained, and the three-dimensional measurement precision is improved.

Description

technical field [0001] The invention relates to the technical field of three-dimensional measurement of objects, in particular to a phase unwrapping method based on the Goldstein branch cut method. Background technique [0002] With the development of modern science and technology, people's demand for the collection of three-dimensional information of objects is growing. Optical 3D measurement methods are widely used in intelligent manufacturing, virtual reality, cultural heritage protection, biomedicine and industrial testing due to their non-contact and high-precision characteristics. [0003] In many optical 3D measurement methods, the phase value obtained by the phase calculation will be truncated between (-π, π]. It is necessary to convert the truncated phase into a continuous phase through phase unwrapping before the measured object can be obtained through phase height mapping. Therefore, the quality of the phase unwrapping result has a great influence on the accuracy...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 彭旷游前赵江王文峰李岳彬万美琳宋敏
Owner HUBEI UNIV
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