Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Coded grating projection method in three-dimensional measurement of coding structured light

A coded structured light and three-dimensional measurement technology, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of inaccurate grading of coded gratings and low error tolerance rate, so as to avoid noise interference, reduce calculation amount, and improve projection efficiency effect

Inactive Publication Date: 2017-12-19
API ZC PRECISION INSTUMENT CO LTD
View PDF6 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a coded grating projection method in the three-dimensional measurement of coded structured light to solve the problems of inaccurate grading and low error tolerance rate in the design of coded gratings in the prior art, and to achieve the purpose of improving the grading accuracy and fault tolerance rate

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
  • Coded grating projection method in three-dimensional measurement of coding structured light
  • Coded grating projection method in three-dimensional measurement of coding structured light
  • Coded grating projection method in three-dimensional measurement of coding structured light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 The coded grating projection method in the coded structured light three-dimensional measurement shown includes the following steps: (a) according to the field of view and the required measurement accuracy, determine the number X of the coded area, let X=2 n ; Wherein n is the quantity of coding pattern; (b) by binary design n bit Gray code coding code word: n gets 4 in the present embodiment, then Gray code code word G=(g 4 , g 3 , g 2 , g 1 ), a total of 2 4 , as shown in the table below:

[0024]

[0025] (c) design n coded grating patterns according to the Gray code code word, and project n coded grating patterns to the surface of the measured object in turn; each projected image is taken with a video camera; (d) all projected images are pressed Combining in sequence for encoding and decoding: any point on the image is encoded according to the position of the point in the image captured by the camera. The code value in the black stripes in th...

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 coded grating projection method in the three-dimensional measurement of coding structured light. The method comprises the steps of (a) determining a number X of areas with the need of encoding according to a visual field range and required measurement precision, and allowing X=2<n>, (b) designing an n-bit Gray code encoding code by a binary system, (c) designing n coded grating patterns according to the Gray code encoding code, orderly projecting the coded grating patterns to the surface of a measured object in order, and shooting each projection image with a camera, (d) sequentially combining all projection images to carry out encoding and decoding, and (e) repeating the step (d) to obtain fringe orders of all pixels. The method is used to solve problems of inaccurate grading of coded grating design and low fault tolerance in the prior art, and the purpose of improving the grading accuracy and fault tolerance is achieved.

Description

technical field [0001] The invention relates to the field of three-dimensional measurement, in particular to a coded grating projection method in coded structured light three-dimensional measurement. Background technique [0002] As one of the most reliable technologies in 3D measurement, coded structured light 3D measurement method has become the main research direction in 3D measurement books because of its advantages of fast measurement speed, convenient operation and high measurement accuracy. In the 3D measurement of coded structured light based on phase measurement profilometry, the encoding method of projected grating pattern is a key technology that affects the accuracy of 3D measurement of coded structured light. Design the corresponding coded grating pattern for projection according to a certain coding method, then perform projection, collect the projected image, and then encode and decode the pixels in the collected image. The grating pattern used for projection ...

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
CPCG01B11/2531
Inventor 刘宁王伟周姝李家勇
Owner API ZC PRECISION INSTUMENT CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com