Phase unwrapping by a lookup table method: application to phase maps with singular points

Phase unwrapping by a lookup table method has been used to analyze the phase map with singular points that is derived from a multiple-spatial-carrier-frequency fringe pattern. The phase unwrapping can be performed independently on a pixel-by-pixel basis without reference to the phase values of neighboring pixels, and is relatively insensitive to errors. Experimental results are presented that demonstrate the validity of the principle. (C) 1999 Society of Photo-Optical Instrumentation Engineers. [S0091-3286(99)02812-3].