Results 71 to 80 of about 355 (113)

3D optical metrology by digital moiré: Pixel-wise calibration refinement, grid removal, and temporal phase unwrapping [PDF]

, 2016
Fast, accurate three dimensional (3D) optical metrology has diverse applications in object and environment modelling. Structured-lighting techniques allow non-contacting 3D surface-shape measurement by projecting patterns of light onto an object surface,
Mohammadi, Fatemeh
core  

Deep Learning-Based Invalid Point Removal Method for Fringe Projection Profilometry

Chinese Journal of Mechanical Engineering
Fringe projection profilometry (FPP) has been widely applied to non-contact three-dimensional measurement in industries owing to its high accuracy and speed.
Nan He, Jiachun Huang, Shaoli Liu, Sizhe Fan, Jianhua Liu, Jia Hu, Hao Gong   +6 more
doaj   +1 more source

High-Efficiency Dynamic Three-Dimensional Topography Measurement Using the Phase Shift Generation Method

Photonics
In the fringe projection profilometry (FPP), the traditional phase-shifting (TPS) algorithm and the Fourier transform (FT) algorithm are beset with a conundrum where measurement efficiency and conflicts with measurement accuracy, thereby limiting their ...
Qinyuan Deng, Yangyi Liu, Fashi Zhu, Jie Hou, Fei Xiong, Yan Zhang   +5 more
doaj   +1 more source

Three-dimensional profilometry based on two-step generalized phase shift for phase measurement of grating projections

Results in Optics
An algorithm is proposed to extract the phase from deformed grating images using a two-step generalized phase-shifting technique for fringe projection profilometry (FPP).
Jiacheng Qi, Hongjin Qin, Ang Sun, Youpan Lai, Jie Li   +4 more
doaj   +1 more source

APPARATUS, SYSTEM, AND METHOD FOR GENERATING CIRCULAR FRINGE PROJECTIONS FOR PROFILOMETRY-BASED EYE TRACKING [PDF]

We propose a new projector design to generate circular fringe projector for eye tracking. The projector consists of a collimated laser source, a Pancharatnam-Berry phase (PBP) lens, and a linear polarizer.
Bills, Jon
core   +1 more source

Three‐dimensional phenotyping of soybean roots under different water treatment conditions using fringe projection

Plant Phenome Journal
Accurate phenotyping of root traits is essential for understanding how plants respond to varying soil water treatment conditions, yet traditional phenotyping methods are often destructive and limited in capturing the full three‐dimensional (3D ...
Victoria MacDans, Jiaqiong Li, Zenglu Li, Beiwen Li   +3 more
doaj   +1 more source

Multi-Color Channel Gamma Correction in Fringe Projection Profilometry

Photonics
Three-dimensional shape measurement plays an important role in various fields. As a way of three-dimensional measurement, fringe projection profilometry (FPP) is widely used because of its non-contact, simple structure, and high stability. One of the key
Xiang Sun, Yunpeng Zhang, Lingbao Kong, Xing Peng, Zhenjun Luo, Jie Shi, Liping Tian   +6 more
doaj   +1 more source

Digital-twin-driven unambiguous structured light 3D imaging with physics-aware learning

npj Nanophotonics
Temporal phase unwrapping (TPU) plays a pivotal role in resolving phase ambiguities in fringe projection profilometry (FPP) caused by surface discontinuities or spatially isolated features.
Yiheng Liu, Wenwu Chen, Jinyang Jiang, Shengqi Yu, Ziheng Jin, Xinsheng Li, Shijie Feng, Qian Chen, Chao Zuo   +8 more
doaj   +1 more source

Correction: Li et al. Fringe Projection Profilometry Based on Saturated Fringe Restoration in High Dynamic Range Scenes. Sensors 2023, 23, 3133. [PDF]

Sensors (Basel), 2023
Li H, Wei H, Liu J, Deng G, Zhou S, Wang W, He L, Tian P.   +7 more
europepmc   +1 more source

Experimental investigation of trans-scale displacement responses of wrinkle defects in fiber reinforced composite laminates

Wrinkle defects were found widely exist in the field of industrial products, i.e. wind turbine blades and filament-wound composite pressure vessels.
Guo, Jing, Liu, Changchen, Ma, Li, Wang, Shoulong, Wen, Ange, Ying, Kaidi   +5 more
core