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.
CN114754701AActive Publication Date: 2022-07-15HUBEI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUBEI UNIV
Publication Date
2022-07-15

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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.
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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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