Patent Document ID: 20150153162
Application ID: 14404918
Patent Status: 0

Claim One:
1. A method of three-dimensional measurement of an object by stereo-correlation, said method being implemented by at least two cameras connected to image processing means, said cameras being positioned so as to give at least a first image and a second image of the object seen from at least two different angles, the image processing means arranged so as to determine all or part of the three-dimensional coordinates of said object, said method including at least two steps: a first step of calibration wherein, a template of known shape being arranged in the field of the cameras, the processing means compute the at least two transfer matrices linking the three-dimensional coordinates captured in the reference frame of the template with the two-dimensional coordinates captured in the at least two reference frames of the first image and of the second image of said template; a second step of spatial matching wherein, the object to be measured being arranged in the field of the cameras, the processing means determine the whole displacement field existing between the at least two images of said object to be measured, making it possible to obtain the smallest possible difference between said images; wherein, the object surface and the surface of the template having a parametric representation, being a mathematical representation of the surface having the form of a decomposition over a scalar function basis, said parametric representation is implemented in the first calibration step and in the second spatial matching step.