NONLINEAR PROCESSING FOR OFF-AXIS FREQUENCY REDUCTION IN DEMODULATION OF TWO DIMENSIONAL FRINGE PATTERNS
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United States of America Patent
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Issued Date -
May 12, 2016
app pub date -
Nov 3, 2015
filing date -
Nov 3, 2015
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Abandoned
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Abstract
A method of demodulating an image captured from an imaging system having at least one two-dimensional grating. The captured image comprises a phase modulated fringe pattern comprising cross-term phase components resulting from presence of the at least one two-dimensional grating. The method determines parameters of at least a first non-linear transformation for attenuating the cross-term phase components. The parameters of the first non-linear transformation are determined for the imaging system to reduce artefacts in a demodulated image introduced by the cross-term phase components. The method demodulates the captured image by applying at least the first non-linear transformation with the determined parameters to the captured image to attenuate the cross-term phase components.
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