Optical EngineeringHigh-speed phase-shift computation using dynamic memory processing
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The conventional method of applying the arctangent operation at every picture element in an interferogram slows down the phaseshift 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 phaseshifted intensities. Performance tests on different types of processors reveal a two to seven times increase in computational speed using the method.