Demodulating Digital Holograms with Unknown Uniform Phase-shifts by Spiral Phase Transform

The Spiral Phase Transform (SPT) is a generalization of the Hilbert transform for 2D signals and, as such, can be used for AC signal demodulation.

However, phase demodulation with the SPT is complicated by a multiplicative term that depends on the fringe directional map.

We derived an analytical formula for the twofold directional map and applied the SPT for the blind reconstruction of phase-shifted digital holograms.

Possible phase ambiguities in the unfolded directional map were resolved by satisfying the spatial uniformity condition of the phase shifts.

The method was experimentally verified using on-axis and off-axis digital holograms of specularly reflecting subjects.