SUBFRINGE INTEGRATION PROFILOMETRY OF 3-DIMENSIONAL DIFFUSE OBJECTS

A fringe analysis technique is proposed to automatically measure 3-D o bject shape. A grating pattern is projected onto an object, and the gr ating pa :tern deforms in accordance with the 3-D object. This deforme d grating image is analyzed by means of the subfringe integration algo rithm (SIA), in which the phase is retrieved using N bucket integratio n. Only one frame of the image is sufficient to obtain the phase distr ibution and the object shape at every pixel on measured object. Theore tical analysis, experimental results, and simulation calculations are presented. (C) 1997 Society of Photo-Optical Instrumentation Engineers .