Hiding image data with a light-scattering medium is effective as a basic data protection technique. The hidden image data can be observed only by using a low-coherence interference technique and is thus protected from unauthorized access. Unlike an intensity-distributed object, a digital relief object has no intensity distribution, making it possible to hide its existence by using a dilute light-scattering medium. To reconstruct the digital relief object through the light-scattering medium, we developed phase-shifting digital holography with a low-coherence light source. The experimental performance, including the spatial resolution and phase error of the reconstructed image, is estimated.
© 2006 Optical Society of America
Original Manuscript: February 7, 2005
Revised Manuscript: August 1, 2005
Manuscript Accepted: August 2, 2005
Vol. 1, Iss. 3 Virtual Journal for Biomedical Optics
Shingo Tamano, Yoshio Hayasaki, and Nobuo Nishida, "Phase-shifting digital holography with a low-coherence light source for reconstruction of a digital relief object hidden behind a light-scattering medium," Appl. Opt. 45, 953-959 (2006)