As both techniques require for the phase calculation a single frame only, they are specially capable for the analysis of transient events and for performing measurements in adverse conditions. The error considerations and the examples of applications of this methods are presented. The advantages and disadvantages of these two spatial methods in comparison with temporal phase-shifting technique are given.
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Malgorzata Kujawinska, Joanna Wojiak, "Spatial phase-shifting techniques of fringe pattern analysis in photomechanics," Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991);