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30 September 1999 Spatio-spectral phase unwrapping for multiwavelength heterodyne interferometry
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Optical path difference (OPD) measurements typically are characterized by 2(pi) phase discontinuities, since optical interference can only determine the wavefront modulo the wavelength. Obtaining an estimate of the actual phase profile from OPD measurements necessitates removing the discontinuities, or `unwrapping' the phase. Monochrome phase unwrapping algorithms have been developed over the years in two broad categories--local and global. Local algorithms generally work by starting at some initial point within the OPD map, assigning an arbitrary surface profile value at that point, and working outward from that location, detecting and removing phase jumps pixel-by-pixel. Global algorithms seek simultaneous solutions over the entire map, or on extended regions within it, that minimize overall error according to some criterion.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Harold D. McIntire, Matthew P. Fetrow, and Lenore J. McMackin "Spatio-spectral phase unwrapping for multiwavelength heterodyne interferometry", Proc. SPIE 3815, Digital Image Recovery and Synthesis IV, (30 September 1999);

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