Patent ID: 6750975
Filing Date: 2004-06-15
Classification: G01B,G06T

Abstract:
A method for obtaining a measurement value of a three-dimensional shape of an object, using a grid image formed by projecting a plurality of grid patterns upon the object to be measured, the method comprising the steps of:providing a plurality of one-dimensional grids of different colors, with each one of the plurality of one-dimensional grids of different colors having a different rotation angle from another; projecting the grid patterns, from the plurality of one-dimensional grids of different colors, upon the object to be measured; imaging the grid patterns deformed in accordance with the three-dimensional shape of the object to be measured; separating from the grid image each of the one-dimensional grids of different colors; detecting a phase for each of the one-dimensional grids; and obtaining the measurement value on the basis of the detected phases.