Phase unwrapping method based on malposition fringes in three-dimensional scanning system

A technology of three-dimensional scanning and phase unwrapping, which can be applied to measurement devices, instruments, optical devices, etc., and can solve problems such as increased time cost and poor measurement real-time performance.

Inactive Publication Date: 2010-02-17
JIANGSU HENGYUAN SILK GRP +1
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Problems solved by technology

However, this method needs to design 7 progressively dichotomized projection raster images, which greatly increases the time cost of system measurement, and the real-time performance of measurement is poor

Method used

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  • Phase unwrapping method based on malposition fringes in three-dimensional scanning system
  • Phase unwrapping method based on malposition fringes in three-dimensional scanning system
  • Phase unwrapping method based on malposition fringes in three-dimensional scanning system

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Embodiment Construction

[0067] The specific implementation manners of the present invention will be further described below in conjunction with the drawings. According to the above method, the operation of phase unwrapping is realized by programming in C++ through VC++6.0 platform in Windows operating system. This example uses a 3D scanning system to perform phase acquisition and phase unwrapping on motorcycle fenders to obtain accurate and complete full-field phase information.

[0068] Design 4 grating phase shift images with 90° phase shift and a misaligned fringe grating image according to the actual measurement requirements, project them onto the measured object, and then capture them back to the computer by the CCD. According to the 4 phase shift images, use phase shift method, according to A folded phase map with a phase value in the range of -π to π can be obtained; the difference between the misaligned fringe image and the 4 phase-shifted images is obtained, and 4 fringe difference maps ar...

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Abstract

The invention provides a phase unwrapping method based on malposition fringes in a three-dimensional scanning system, mainly relating to the reverse engineering; the three-dimensional scanning systemis used for carrying out phase unwrapping according to the malposition fringes; according to the needs, four grating phase shifting pictures with 90-degree phase shifting are designed, and a malposition fringe grating is designed according to the coding requirements for designing the malposition fringes, and the four grating phase shifting pictures are respectively projected to an object to be measured, and then a CCD is used for back-shooting to a computer. According to the four phase shifting pictures, a folding phase shifting picture with phase value which is in a range from -Pi to Pi is obtained by a phase shifting method; the difference of the malposition fringe pictures and the four phase shifting pictures are made respectively, so as to obtain four fringe differential pictures, thefringe characteristics of all positions in the malposition fringe grating are determined by zero fringe information in the differential pictures, and then the coding information of the malposition fringes is combined again, so as to determine the order of each single-cycle fringe in the malposition fringes, which is obtained by the CCD and guide the folding phase to be unwrapped. The whole computing process does not depend on routes, thereby having good real-time performance.

Description

technical field [0001] The invention mainly relates to a method for solving the phase according to four-step phase shift fringes and dislocation fringes by using a three-dimensional scanning system in reverse engineering. The invention belongs to the technical field of three-dimensional information reconstruction. Background technique [0002] Reverse Engineering (Reverse Engineering, RE) technology is a new technology that appeared in the field of advanced manufacturing in the late 1980s. It generally includes four basic links: three-dimensional shape detection and conversion (obtaining physical data), data preprocessing (point Cloud processing, recognition, multi-view splicing), CAD model establishment (surface reconstruction), CAM part molding. Most of the research on reverse engineering mainly focuses on the reverse reconstruction of the object, that is, the reconstruction of the CAD model of the product object and the manufacturing of the final product, which is called...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25
Inventor 达飞鹏王新盖绍彦
Owner JIANGSU HENGYUAN SILK GRP
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