Three-dimensional object recognition by Fourier transform profilometry

1999 ◽  
Vol 38 (22) ◽  
pp. 4760 ◽  
Author(s):  
José J. Esteve-Taboada ◽  
David Mas ◽  
Javier García
Keyword(s):  
Fourier Transform ◽  
Object Recognition ◽  
Three Dimensional ◽  
Fourier Transform Profilometry ◽  
Dimensional Object

3D Profile Variety Measurement of Pectoral Fin in Fish Fast Start

2011 ◽  
Vol 83 ◽  
pp. 280-284
Author(s):  
Ming Jiang ◽  
Shu Zhang ◽  
Xiao Yuan He
Keyword(s):  
Fourier Transform ◽  
High Speed ◽  
Kinetic Characteristic ◽  
Three Dimensional ◽  
Pectoral Fin ◽  
Fourier Transform Profilometry ◽  
Fast Start ◽  
Fringe Patterns ◽  
3D Information ◽  
3D Profile

Fast-starts are brief, sudden accelerations used by fish during predator-prey encounters. In this paper, a three-dimensional (3D) test and analysis method is critical to understand the function of the pectoral fin during maneuvers. An experiment method based on Fourier Transform Profilometry for 3D pectoral fin profile variety during fish maneuvers is proposed. This method was used in a carp fast-start during prey. Projecting the moiré fringes onto a carp pectoral fin it will produce the deformed fringe patterns contain 3D information. A high speed camera captures these time-sequence images. By Fourier transform, filter, inverse Fourier transform and unwrap these phase maps in 3D phase space, the complex pectoral fin profile variety were really reconstructed. The present study provides a new method to quantify the analysis of kinetic characteristic of the pectoral fin during maneuvers.

A High Precision Three-Dimensional Optical Sensor Using Fourier Transform Profilometry

2005 ◽  
Vol 295-296 ◽  
pp. 171-176
Author(s):  
H.Y. Sung ◽  
L.F. Tien ◽  
C.Y. Lin ◽  
C.Y. Lo ◽  
Y.R. Lin ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Optical Sensor ◽  
Three Dimensional ◽  
Automatic Measurement ◽  
Ccd Camera ◽  
Medical Diagnostics ◽  
Sinusoidal Grating ◽  
Height Distribution ◽  
Object Shape ◽  
Fourier Transform Profilometry

Automatic measurement of an object shape is very important in solid modeling, machine vision, industrial inspection, and medical diagnostics, etc. We propose an optical sensor, which comprises a telecentric projector with a sinusoidal grating and a linear CCD camera. We use the FTP (Fourier transform profilometry) method to make a measurement on three-dimensional object. In the FTP method, a grating pattern projected onto the object surface is modulated by the height distribution of the object. The deformed fringe pattern is Fourier transformed and processed in the spatial frequency domain as well as in the space signal domain to demodulate the object shape from the main frequency component in the Fourier spectra. This optical sensor provides a rapid and non-invasive three-dimensional image acquisition. The repeatability is better than 5 µm within the 3σ limits.

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