IMAGE PROCESSING METHOD IN LATTICE PATTERN PROJECTIVE METHOD, IMAGE PROCESSOR AND MEASUREMENT DEVICE

摘要

PROBLEM TO BE SOLVED: To automatically acquire a fringe wave number even for a discontinuous portion of a fringe in a lattice pattern projective method. SOLUTION: This image processing method includes steps for: acquiring a first image of a measured object when projecting a first lattice pattern comprising fringes of light and shade onto the measured object; acquiring a second image of the measured object when projecting a second lattice pattern obtained by reversing the light and shade of the fringes of a part of the first lattice onto the measured object; and specifying a pixel related to the fringe obtained by reversing the light and shade on the basis of the first and second images. Because the light and shade of the specific fringe is intentionally reversed, the fringe wave number of the reversed fringe is self-evident, and the fringe of the pixel is determined when the pixel related to the reversed fringe is specified from a difference between the first image and the second image. COPYRIGHT: (C)2005,JPO&NCIPI