PHASE ANALYSIS METHOD OF INTERFERENCE PATTERN OR PROJECTION GRID USING ALIASING

摘要

PROBLEM TO BE SOLVED: To provide a phase analysis method capable of analyzing phase of interference pattern or projection grid with a smaller number of samplings. SOLUTION: The phase of interference pattern or projection grid is analyzed from the image obtained by imaging fsamtimes while the phase of the interference pattern or projection grid is changed by 2πf, with f and fsambeing natural numbers and fsam<2N. The phase of interference pattern or projection grid is acquired as an argument of complex number which is acquired by Fourier transform with the frequency generated by aliasing which is given with f'=f±kfsam, with k being an arbitrary natural number. COPYRIGHT: (C)2005,JPO&NCIPI