Improving measurement accuracy in 3D profilometry

Improving the accuracy performance of phase-shifting profilometry for the measurement of objects in motion.

This Letter presents a new approach to reducing the errors associated with the shape measurement of a rigid object in motion by means of phase-shifting profilometry. While the work previously reported is only valid for the case of two-dimensional (2-D) movement, the proposed method is effective for a situation in which the object moves in a three-dimensional (3-D) space. First, a new model is p...

Single-shot absolute 3D shape measurement with Fourier transform profilometry.

Fourier transform profilometry (FTP) is one of the frequently adopted three-dimensional (3D) shape measurement methods due to its ability to recover single-shot 3D shapes, yet it is challenging to retrieve the absolute phase map solely from one single grayscale fringe image. This paper presents a computational framework that overcomes this limitation of FTP with digital fringe projection (DFP)....

O-ring Surface Inspection With 3D Profilometry

Improving accuracy, robustness and computational efficiency in 3D computer vision

This paper analyses the strengths and weaknesses of some of the most popular traditional and contemporary 3D vision techniques for accuracy, robustness and computational efficiency. A novel technique is proposed that extends traditional stereo vision algorithms using some of the previously identified techniques resulting in improved robustness, accuracy and computational efficiency. The new mul...

FEAT: Improving Accuracy in End-to-end Available Bandwidth Measurement

Abstract—This report describes our ongoing work on a new end-to-end available-bandwidth measurement tool: FEAT (Fish-Eye Availablebandwidth Tool). FEAT features a new dynamic pattern of probes called a Fisheye Stream. One fisheye stream covers a range of packet probing rates. A fisheye stream consists of a focus region, where the probing rates are sampled more frequently and the number of packe...