Experimental study of optical scanning holography based on random-phase encoding and connected component labeling

In this paper, we demonstrate a physical experiment of optical scanning holography based on random-phase encoding and connected component labeling. Usually, a pinhole is used as one of pupil functions in conventional optical scanning holography experiment. Although such a structure is relatively simple, defocus noise trends to appear as a blur in sectional image reconstruction. In our experiments, a random-phase pupil is used, and it can easily transform defocus noise into speckle-like patterns with the increase in defocus distance. We apply connected component labeling to deal with the speckles, and the focus image can be recovered clearly from reconstructed images.