Method for realizing high speed moving article 3D profile measurement using stroboscopic structure lighting

A moving object, stroboscopic technology, applied in the field of optical three-dimensional sensing, can solve the problem of inability to obtain clear deformed stripes

Inactive Publication Date: 2004-12-15
SICHUAN UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the defect that the structured light field projected by the constant bright light source cannot obtain clear deformation fringes in the dynamic process, and proposes a real-time three-dimensional image of high-speed moving objects by using the frequency light source projected structured light field in the measurement of three-dimensional sensing technology. Surface Measurement Method

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  • Method for realizing high speed moving article 3D profile measurement using stroboscopic structure lighting
  • Method for realizing high speed moving article 3D profile measurement using stroboscopic structure lighting
  • Method for realizing high speed moving article 3D profile measurement using stroboscopic structure lighting

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[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings, working principles and embodiments.

[0026] The optical path adopted by Fourier transform profilometry for dynamic measurement is similar to the optical path of traditional static object surface measurement. figure 1 is the projection optical path of the FTP method, 7 is a projection device, 2 is a projection grating, and 3 is an imaging device, generally using a CCD camera. 4 is the object to be measured. E. p , E' p are the exit pupil and entrance pupil of the projection system, E′ p E. p for its optical axis. E' c ,E c are the exit pupil and entrance pupil of the imaging system, E′ c E. c is the optical axis of the imaging system, and the two optical axes intersect at point O on the reference plane 5 . The grating lines of grating 2 are perpendicular to E p E. c O plane, reference plane and E′ c E. c vertical.

[0027] When a sinusoidal grati...

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Abstract

The present invention relates to the real-time measurement method of the 3D profile and deformation of object in high speed motion based on stroboscopic light source projecting structure in Fourier transformation contour process in 3D sensing technology. Equilateral grating structure modulating template is imaged on the moving object surface instantaneously with stroboscopic light source, serial deformation stripe patterns in different times are recorded with video camera, the deformation stripe patterns are then processed via Fourier transformation process to restore the 3D profiles of the moving object in different times precisely, and digital information, such as object deformation, etc. may be obtained through further data analysis. The real-time measurement method may be used in measurement and research of various periodic motion and non-periodic motion, and has the advantages of being precise, fast and timely.

Description

1. Technical field [0001] The invention relates to optical three-dimensional sensing technology, in particular to the method based on Fourier transform profilometry, which uses a frequency light source to project a structured light field to realize real-time three-dimensional surface shape and deformation measurement of a high-speed moving object. 2. Technical background [0002] Three-dimensional object surface profile measurement, that is, three-dimensional surface shape measurement, is of great significance in the fields of machine vision, biomedicine, industrial inspection, rapid prototyping, film and television special effects, product quality control and other fields. Optical three-dimensional sensing technology has been greatly developed due to its advantages of non-contact, high precision, and easy automatic control. Existing optical three-dimensional sensing methods mainly include: triangulation, Moiré Topography (MT for short), Fourier Transform Profilometry (FTP f...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/25G02B27/22
Inventor 苏显渝张启灿曹益平向立群陈文静
Owner SICHUAN UNIV
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