title: Edge extraction using a time-varying vortex beam in incoherent digital holography.
abstract: Edge extraction using a time-varying vortex beam (TV-VB) is demonstrated in optical scanning holography (OSH) operating in an incoherent mode. OSH is a two-pupil heterodyne scanning optical system. We propose that one of the pupil functions used is a delta function and the other pupil function is a spiral phase plate (SPP). The interference of these pupils creates a TV-VB to scan over an object to record the edge-only information of an object holographically. We also find that a reconstructed edge with better contrast is achieved by translating the SPP away from the pupil plane. Experimental results are compared with computer simulations and found to be in good agreement.
authors.forename: Yijie
authors.initials: Y
authors.lastname: Pan
authors.forename: Wei
authors.initials: W
authors.lastname: Jia
authors.forename: Junjie
authors.initials: J
authors.lastname: Yu
authors.forename: Kelly
authors.initials: K
authors.lastname: Dobson
authors.forename: Changhe
authors.initials: C
authors.lastname: Zhou
authors.forename: Yongtian
authors.initials: Y
authors.lastname: Wang
authors.forename: Ting-Chung
authors.initials: TC
authors.lastname: Poon