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Three-dimensional surface shape measurement method based on precorrected grating projection

A three-dimensional surface, grating projection technology, applied in the field of three-dimensional measurement, can solve problems such as the limitation of triangulation

Inactive Publication Date: 2016-10-12
HUAIYIN TEACHERS COLLEGE
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that the establishment of the entire system of the existing triangulation method must meet certain constraints, which makes the triangulation method have certain limitations in practical application.

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  • Three-dimensional surface shape measurement method based on precorrected grating projection
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  • Three-dimensional surface shape measurement method based on precorrected grating projection

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Embodiment Construction

[0065] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0066] like figure 1 As shown, the present invention provides a three-dimensional surface shape measurement method based on pre-corrected gratings, comprising the following steps:

[0067] The first step is to generate a standard pre-corrected grating fringe image by computer;

[0068] The second step is to use the projector to project the pre-corrected grating fringe image onto the measured object, and ensure that the grating fringes projected on the reference surface meet the equi-periodic distribution; at this time, the grating fringe image projected on the measured object will be produce deformation;

[0069] The third step is to use the camera to shoot the corresponding deformed fringe image projected on the object to be measured, and upload it to the computer;

[0070] In the fourth step, the computer analyzes the captured fringe ima...

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Abstract

The invention discloses a three-dimensional surface shape measurement method based on precorrected grating projection. The method includes the following steps that standard precorrected grating stripe images are generated through a computer; the precorrected grating stripe images are projected to a to-be-measured object through a projector, and it is guaranteed that grating stripes projected to a reference face are distributed in an equal-cycle mode; a camera shoots corresponding deformed grating stripe images projected to the to-be-measured object and uploads the images to the computer; the computer analyzes the shot stripe images according to the mapping relation between phases of a projection axis of the projector and an imaging optical axis of the camera on different surfaces condition and the height of the to-be-measured object, and finally the surface shape distribution of the to-be-measured object is calculated and recovered. By means of the three-dimensional surface shape measurement method, distribution of the projected grating stripes is improved, a phase-height mapping algorithm under the situation that the projection axis of the projector and the imaging optical axis of the camera are on different surfaces is derived, constraint conditions for system measurement are broadened, erection of a measurement system is easier, and high-precision measurement can be achieved.

Description

technical field [0001] The invention relates to the field of three-dimensional measurement, in particular to a three-dimensional surface shape measurement method based on pre-correction grating projection. Background technique [0002] Grating projection three-dimensional measurement technology has the characteristics of non-contact, high precision, large field of view, and more data acquisition. It has broad application prospects in reverse engineering, product inspection, machine vision, biomedicine, and cultural relics protection. Phase measurement profilometry (PMP), as an important three-dimensional sensing method, plays an important role in three-dimensional surface shape measurement. [0003] The traditional grating projection three-dimensional measurement technology is a system optical structure based on triangulation, and the establishment of the entire system must be based on three obvious constraints: [0004] (1) The line connecting the pupil of the projection s...

Claims

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Application Information

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IPC IPC(8): G01B11/25
CPCG01B11/254
Inventor 边心田
Owner HUAIYIN TEACHERS COLLEGE
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