High‐speed phase‐shift computation using dynamic memory processing

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Abstract
The conventional method of applying the arctangent operation at every picture element in an interferogram slows down the phase‐shift technique. A method that precalculates and dynamically stores the phase combinations in the computer’s random‐access memory is introduced. The appropriate value is then mapped out based on input phase‐shifted intensities. Performance tests on different types of processors reveal a two to seven times increase in computational speed using the method. © 1996 Society of Photo−Optical Instrumentation Engineers.

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