DIGITAL HOLOGRAPHIC IMAGING TECHNIQUE WITH TWIN IMAGE ELIMINATION

摘要

A digital holographic imaging technique, with iterative steps of: a) through back-propagation to the object coordinate of a hologram field comprising a spatial distribution of amplitude corresponding to the spatial distribution of intensity of the hologram and a spatial distribution of phase, determining (S03a) an object field involving a spatial distribution of absorption and of phase shift of the imaged object, b) thresholding (S03b) the values of the spatial distribution of absorption and of phase shift by decreasing the values to below a respective threshold, the thresholds decreasing in each iteration, c) through repropagation of the object field to the hologram coordinate, determining (S03c) a modified hologram field comprising a modified spatial distribution of amplitude and a modified spatial distribution of phase, d) replacing (S03d) the spatial distribution of phase of the hologram field with the modified spatial distribution of phase, the spatial distribution of phase shift and of absorption of the imaged object being those of the object field of the last iteration.