  We demonstrate the feasibility of high-quality digital holography of the
human retina in real-time with a fast camera and commodity computer hardware.
High throughput rendering of digital Fresnel holograms from optically-acquired
inline interferograms is performed in conjunction with temporal demodulation by
projection of hologram sequences onto a data-derived basis in order to
discriminate local narrowband coherent detection contrasts, mostly due to blood
flow and optical absorption, from spurious interferometric contributions.
Digital holograms are calculated from a sustained input stream of 16-bit,
1024-by-1024-pixel interferograms recorded at up to 500 frames per second,
processed by principal component analysis. This temporal signal demodulation
scheme consists in the projection of stacks of 32 consecutive holograms onto a
basis calculated by eigendecomposition of the matrix of their time-lagged
covariance; it is performed up to 20 times per second with commodity computer
hardware.
