High-resolution measurement of phase-shift amplitude and numeric object phase calculation

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Abstract
A new method for measuring the object independent irradiance function for combined Gray-code and phase-shift 3-D measurement systems is presented. The irradiance functions of the projected sinusoidal patterns are measured with high resolution in the phase space without leaving the signal chain of the measurement system. This preserves the system specific distortions of the projected intensity functions. The system specific irradiance functions can be used to compute the object phase numerically. It can be shown that the systematic error of phase shift measurement caused by non sinusoidal phase-shift patterns and phase shifter mis-calibration can be reduced significantly.

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