Proceedings ArticleDOI
Development and application of talbot images technique for reconstruction of three dimensional objects
TLDR
A non-contact system for obtaining three-dimensional objects topography that combines the fringe projection technique and the Talbot effect which is knowed like Talbot interferometry is presented.Abstract:
We present a non-contact system for obtaining three-dimensional objects topography The described system combines the fringe projection technique and the Talbot effect which is knowed like Talbot interferometry In fringe projection technique, the digitalization is realized when black and white lines are projected over the object and this image is captured by the CCD In Talbot interferometry, the object is collocated on one of the grating auto-image planes The deformed grating image is captured by the CCD and superposed with other reference one that can be physical or computer generated (virtual/synthetic) for obtaining a moire pattern which gives information about the object topography The topography of a coin and phalangeal articulation are obtained by using of this technique The Spatial Synchronous Detection and Fourier Method were incorporate to retrieve the phaseread more
Citations
More filters
Journal Article
Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry
TL;DR: In this article, a fast Fourier transform method of topography and interferometry is proposed to discriminate between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour generation techniques.
Proceedings ArticleDOI
Topography measurement of specular and diffuse surfaces
TL;DR: The topography of lens is measured by using a technique of diffuse reflection (fringe projection technique) and by a method based on specular reflection technique (similar to Placido disk system) to retrieve three-dimensional shape of lens.
References
More filters
Journal Article
Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry
TL;DR: In this article, a fast Fourier transform method of topography and interferometry is proposed to discriminate between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour generation techniques.
Journal ArticleDOI
Parallel algorithms for phase unwrapping based on Markov random field models
TL;DR: A general framework is presented, based in Bayesian estimation theory with the use of Markov random field models to construct the prior distribution, so that the solution to the unwrapping problem is characterized as the minimizer of a piecewise-quadratic functional.
Journal ArticleDOI
3-D Contouring of Diffuse Objects by Talbot-projected Fringes
TL;DR: In this article, the authors used the Talbot image of a linear grating to obtain the moire fringes, which represent surface contours of equal depth, and used a phase measurement technique and digital image processing algorithms to obtain surface shape information.
Journal ArticleDOI
Surface profiling of a transparent object by use of phase-shifting Talbot interferometry
TL;DR: Talbot interferometry is used to study the surface profile of a transparent object by illuminating a grating with a collimated laser beam, and the phase variation is achieved by a linear translation stage.
Proceedings ArticleDOI
Topography measurement of specular and diffuse surfaces
TL;DR: The topography of lens is measured by using a technique of diffuse reflection (fringe projection technique) and by a method based on specular reflection technique (similar to Placido disk system) to retrieve three-dimensional shape of lens.