Changes

== Phase Shifting Technique ==

== Phase Shifting Technique ==

[[Image:framediff1.jpg|thumb|A schematic of rotations]]

[[Image:framediff.jpg|thumb|A schematic of rotations]]

As noted in the introduction, the first phase-shifting algorithms were designed in the 1960's by Carre, Rowley and Harmon.  The essence of the phase shifting algorithm lies in the ability to gather the necessary phase information from (theoretically) three to (more realistically) five interference patterns, called frames, so that a nearly complete image may be rendered of the surface in question.

As noted in the introduction, the first phase-shifting algorithms were designed in the 1960's by Carre, Rowley and Harmon.  The essence of the phase shifting algorithm lies in the ability to gather the necessary phase information from (theoretically) three to (more realistically) five interference patterns, called frames, so that a nearly complete image may be rendered of the surface in question.