Holographic Method for Extracting Three Dimensional Information with a CCD Camera

Abstract

A method for extracting three-dimensional information from holographic interference fringe patterns by using an interferometer is studied and its effectiveness is confirmed experimentally. The holographic fringe patterns of the object surface, which is assumed to be a set of point sources, are compared with standard patterns calculated assuming that a corresponding point object exists in the measured space. We show theoretically that three-dimensional information can be extracted by three methods : for the sum of products of each pixel, computational correlation using Fourier transformation, and optical correlation. We also simulate extractions of a set of point sources by correlation and optical correlation, and we experimentally confirm the effectiveness of this method applying to actual point-source object and line objects and using interference fringe pattern captured by a CCD camera.