Phase error compensation method applied to grating three-dimensional projection measurement

A phase error and three-dimensional projection technology, applied in the field of phase error compensation, can solve problems such as measurement errors

Active Publication Date: 2018-01-19
SOUTHEAST UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a phase error compensation method applied in grating three-dimensional projection measurement. By establishing a sub-area error compensa

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  • Phase error compensation method applied to grating three-dimensional projection measurement
  • Phase error compensation method applied to grating three-dimensional projection measurement
  • Phase error compensation method applied to grating three-dimensional projection measurement

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Embodiment Construction

[0044] Under the Windows operating system, Visual Studio is selected as the programming tool to generate the grating, and the phase compensation obtained from the solution of the collected sinusoidal grating fringes is performed. In this example, a Wiener statue is used as the measured object, and a relatively accurate absolute phase distribution containing three-dimensional information is finally obtained, and three-dimensional data is generated.

[0045] The measurement range of the present invention is the overlapping portion of the projection area of ​​the projector and the field of view of the camera. When the surface of the object is within the measurement range, grating stripes can be projected onto the object, and the projected fringe images can also be captured by the camera at the same time. In order to solve the gamma non-linear problem of the projector, the present invention uses a camera to capture a single gray value image projected on a standard whiteboard, divid...

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Abstract

The invention discloses a phase error compensation method applied to grating three-dimensional projection measurement. The method includes the following steps: generating sine grating stripes; collecting grating stripes that are modulated by the surface of an object; pre-processing images; carrying out phase unwrapping through a phase shift method on the basis of the pre-processed stripe images; projecting a grey-scale image with a single gray value onto the surface of a standard white board; mapping regional results in the step (5) onto a target surface of a projector through an obtained ideal phase; establishing regional correction models for different regions according to the regional results; projecting the sine grating stripes onto the object; solving an initial phase through a phaseshift method, compensating the phase on the basis of established regional error compensation, and solving an actual phase; and through calibrated camera parameters and a solved absolute phase, calculating three-dimensional coordinate information of a to-be-measured object through a spatial intersection method. The method overcomes phase errors and measurement errors caused by Gamma non-linearity.

Description

technical field [0001] The invention relates to the technical field of three-dimensional information reconstruction, in particular to a phase error compensation method applied in grating three-dimensional projection measurement. Background technique [0002] Phase measurement profilometry (PMP) is a three-dimensional measurement technology based on fringe projection and phase measurement. Due to its characteristics of non-contact, high speed, high precision, large data volume, large working distance and wide application range of materials, this kind of The technology has been widely used in industrial inspection, machine vision, reverse engineering and other fields. [0003] In the three-dimensional profile measurement based on the phase-shift fringe projection method based on phase recovery, the sinusoidal grating image projected by the projector on the surface of the object is captured by the camera, and the phase is calculated by using a phase shift algorithm of more than...

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Application Information

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IPC IPC(8): G01B11/25
Inventor 盖绍彦达飞鹏刘超
Owner SOUTHEAST UNIV
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