Publication

Shape and deformation measurements of large objects by fringe projection

2004
Patents

Abstract

The height and/or deformation of a surface of an object (10) defined in terms of x, y and z coordinates is measured by projecting a divergent beam of light 21) onto the surface to produce a periodic pattern of fringes (30. A CCD camera (40) views the surface from another angle and images the reflected light. Phase information is extracted from at least one image to produce an optical print (36) of the object containing phase information and image-coordinates information both being related to camera pixel position, the image-coordinates being associated with phase information corresponding to the object coordinates. A processor (50) calculates the object-coordinates of the surface points through mathematical functions describing x, y and z. These mathematical functions take account of the spatial configuration and specifications of the system which are established by calibration procedures involving eg. measurements of a theodolite (60) .

Official source

https://infoscience.epfl.ch/entities/publication/5fdcc99c-3523-42e7-9940-36d17fe02556

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2004
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/5fdcc99c-3523-42e7-9940-36d17fe02556

About this result

Related concepts (32)

Homogeneous coordinates

In mathematics, homogeneous coordinates or projective coordinates, introduced by August Ferdinand Möbius in his 1827 work Der barycentrische Calcul, are a system of coordinates used in projective geometry, just as Cartesian coordinates are used in Euclidean geometry. They have the advantage that the coordinates of points, including points at infinity, can be represented using finite coordinates. Formulas involving homogeneous coordinates are often simpler and more symmetric than their Cartesian counterparts.

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Shape and deformation measurements of large objects by fringe projection

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Distributed Subtyping