Method for realizing rapid modulation degree profilometry by use of two orthogonal sinusoidal gratings

An orthogonal sine and orthogonal grating technology, applied in the field of optical 3D sensing, can solve problems such as slow measurement speed, and achieve real-time 3D reconstruction and good application prospects.

Inactive Publication Date: 2012-06-27
SICHUAN UNIV
View PDF1 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to aim at the defect of slow measurement speed of modulation degree measurement profilometry, and propose a method for fas

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for realizing rapid modulation degree profilometry by use of two orthogonal sinusoidal gratings
  • Method for realizing rapid modulation degree profilometry by use of two orthogonal sinusoidal gratings
  • Method for realizing rapid modulation degree profilometry by use of two orthogonal sinusoidal gratings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings, working principles and embodiments.

[0022] The principle diagram of the present invention is as figure 1 As shown, 1 is the projection light source, 2 is the vertical grating, 3 is the horizontal grating, 4 is the projection lens, 5 is the projected image plane of the vertical grating, 6 is the measured object, 7 is the projected image plane of the horizontal grating, 8 is the reference plane. Under geometric optics approximation, a sinusoidal grating is placed on the position of the object plane of the projection lens, considering the ideal imaging situation, what is obtained on the image plane after imaging by the projection lens is still a sinusoidal grating, and in the present invention, two gratings are used, Since the projection light source is an incoherent light source, and the two gratings are separated by a certain distance, it can be approximated ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for realizing rapid modulation degree profilometry by use of two orthogonal sinusoidal gratings at a certain interval in the optical three-dimensional sensing technology. In the method, two orthogonal sinusoidal gratings at a certain interval are imaged on a measured object at the same time, and the measured object is located between the imaging surfaces of the two gratings; and a CCD (charge coupled device) camera obtains the object surface image modulated by the orthogonal gratings through a semi-transparent semi-reflecting mirror from the same direction. The images of the orthogonal gratings are separated by Fourier transform, spatial frequency-domain filtration and inverse Fourier transform so as to obtain the modulation degree distribution of the images of the two gratings on the object surface; and the object height is recovered according to the pre-calibrated corresponding relationship between the modulation degree ratio and height. In the method, the projection direction of the gratings is coaxial with the imaging direction of the CCD camera, and the method has the characteristic of vertical measurement. The method can recover the object height by acquiring only one image, and has the characteristic of real-time acquisition of three-dimensional information.

Description

technical field [0001] The invention relates to optical three-dimensional sensing technology, in particular to a method for realizing fast modulation degree measurement profilometry by using two orthogonal sinusoidal gratings separated by a certain distance. Background technique [0002] Three-dimensional object surface profile measurement, that is, three-dimensional surface measurement, is of great significance in the fields of machine vision, biomedicine, industrial inspection, rapid prototyping, film and television special effects, product quality control, etc. 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 for short), and spatial phase detection (Spatial Phase Detection). , SPD for short), Phase Measuring Profilometr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01B11/25
Inventor 苏显渝窦蕴甫向立群曹益平张启灿刘元坤陈文静
Owner SICHUAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap