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Fast phase unwrapping algorithm

A technology of unwrapping and phasing, which is applied in the direction of measuring devices, instruments, and optical devices, etc., can solve the problems of excessive number of collected images, large amount of data, long processing time, etc., and achieve strong robustness, accurate results, The effect of fast calculation speed

Inactive Publication Date: 2019-01-04
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

Time-domain unwrapping can handle complex surface shapes better, but there are problems such as too many images to be collected, a large amount of data, and long processing time, and most of them are static measurements

Method used

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Embodiment Construction

[0038] It is easy to understand that, according to the technical solution of the present invention, those skilled in the art can imagine various implementations of the present invention for three-dimensional measurement without changing the essence and spirit of the present invention. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention, and should not be regarded as the entirety of the present invention or as a limitation or limitation on the technical solution of the present invention. The examples of the present invention are described in further detail below in conjunction with the accompanying drawings, but the examples are not intended to limit the present invention, and all similar structures and similar changes of the present invention should be included in the protection scope of the present invention.

[0039] combine figure 2 Execution flowchart, a kind of fast phase unwrapping...

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Abstract

The invention discloses a fast phase unwrapping algorithm which is composed of four key parts including an N-step phase shifting algorithm, making Mask, solving the fringe grade and phase unwrapping.The fast phase unwrapping algorithm concretely comprises the steps: (1) the N-step phase shifting algorithm is applied to solve the wrapping phase; (2) N sinusoidal fringe patterns are utilized to make Mask; (3) the wrapping phase and the connected domain marking algorithm are utilized to solve the fringe grade; and (4) phase unwrapping is performed according to the fringe grade so as to obtain the absolute phase for three-dimensional reconstruction. According to the algorithm, phase solving and unwrapping can be performed by only projecting N sinusoidal phase shifting fringe patterns, and thephase recovery effect is equivalent to that of the conventional method and the algorithm has great advantage in computing speed so that the algorithm is suitable for the application field having therequirement of fast three-dimensional measurement.

Description

technical field [0001] The invention belongs to the technical field of optical three-dimensional measurement, and in particular relates to a fast phase unwrapping algorithm. Background technique [0002] Phase unwrapping is one of the key links of fringe projection three-dimensional measurement technology. How to effectively and quickly perform phase unwrapping is a key research topic for researchers in this field. Through the analysis and research of the current research status and development trends at home and abroad, the current phase unwrapping technology includes time domain and air domain unwrapping algorithms. The spatial unwrapping method is prone to pixel error transmission, and it is easy to fail when measuring complex surface shapes, so the time-phase unwrapping method is more commonly used. Time-domain unwrapping can handle complex surface shapes better, but there are problems such as too many collected images, large amount of data, and long processing time, an...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 伏燕军王霖韩旭
Owner NANCHANG HANGKONG UNIVERSITY
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