Unlock instant, AI-driven research and patent intelligence for your innovation.

Two-step phase shift algorithm based on structured light contrast optimization

A contrast and structured light technology, applied in the direction of optical devices, instruments, measuring devices, etc., to achieve the effect of taking into account global inconsistency and computational efficiency, reducing time, and fast phase reconstruction

Active Publication Date: 2019-07-30
SHANDONG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it takes a certain amount of image acquisition time to collect multiple phase shift images.

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
  • Two-step phase shift algorithm based on structured light contrast optimization
  • Two-step phase shift algorithm based on structured light contrast optimization
  • Two-step phase shift algorithm based on structured light contrast optimization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] figure 1 The overall flow chart of the two-step phase shift algorithm based on structured light contrast optimization of the present invention is given, including the flow chart of the phase calculation process and the flow chart of contrast optimization. In the whole process, from the collected data, through the phase calculation process, the contrast optimization process, and the phase calculation process again, more accurate phase information can be obtained.

[0043] 1. The process of phase calculation is as follows: figure 2 , according to the physical process of fringe casting and mining, a two-step phase-shifted light intensity distribution model is established, and then the reflectance distribution and folded phase distribution of the object surface are calculated. The algorithm sets the phase shift as 3π / 2, and introduces trigonometric functions As an auxiliary condition for solving the folded phase, the quadratic equation about the folded phase is obtained; ...

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

A two-step phase shift algorithm based on structured light contrast optimization comprises two processes consisting of two-step phase shift phase calculation and contrast optimization. In an initial phase calculation process, data of two fringe patterns are employed to obtain reflectivity distribution, two solutions of folding phases are calculated, and the initial phase distribution is constructed and sensitive pixel points are marked through discrimination of the solutions; based on the linear characteristics of absolute phases, the joint optimization of the phases and the contrast is employed to obtain more accurate structured light contrast at the positions of the mark points; and the corrected structured light contrast is subjected to global diffusion, and phase calculation is performed again to obtain more accurate phase information. The two-step phase shift algorithm based on the structured light contrast optimization brings the influence of the ambient light into the changing of the structured light contrast so as to simplify the unknown quantity in the phase shift, reduce the time required by projection and collection of phase shift images and obtain more accurate phase information, the contrast optimization is only performed in a local neighborhood, and the global inconsistency and the calculating efficiency of the contrast are considered.

Description

technical field [0001] The invention relates to a two-step phase shift algorithm based on structured light contrast optimization for three-dimensional imaging and measurement technology, belonging to the field of three-dimensional imaging and measurement. Background technique [0002] In recent years, phase-assisted structured light 3D imaging technology has been widely used in many fields such as industrial production, culture and art, medical imaging, and virtual reality due to its non-contact, high-precision, and easy-to-implement advantages. The phase information is used as the feature information in 3D imaging, which provides unique constraints for matching the corresponding points of the same object point in different images. Obtaining the phase information of the object surface quickly and accurately is the key to this kind of 3D imaging technology. [0003] The phase-shift algorithm is a classic algorithm for phase reconstruction. The phase information of the target...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 殷永凯毛家琦孟祥锋王玉荣杨修伦
Owner SHANDONG UNIV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com