Experimental imaging coding system using three-dimensional subjective speckle structures

EDWARD FABIAN MOSSO; E. PETERS; NESTOR BOLOGNINI; MYRIAN TEBALDI; ROBERTO TORROBA; DARIO PEREZ

Journal of Optics

IOP Publishing- Institute of Physics I

Lugar: Bristol; Año: 2013 vol. 15 p. 125403 - 125409

2040-8978

We propose, and experimentally demonstrate, an optical encoding system employing athree-dimensional subjective speckle distribution as a secure information carrier. An imagemask (containing the information to be sent) is illuminated by randomly distributed light. Theoutgoing wavefront reaches a lens, and thus three-dimensional subjective speckle distributionsare generated in the normal direction of the scattering plane. These speckle structures aresampled by registering consecutive planes along the optical axis with a complementarymetal-oxide semiconductor camera. Along with the optical parameters (keys), these intensitypatterns are sent through independent channels to a receiver. By replicating the original systemwith the keys and implementing a single-beam multiple-intensity reconstruction, we show thatthe message recipient needs a minimum set of speckle images to successfully recover theoriginal information. Moreover, intercepting a partial set of speckle images with the keys maynot result in a successful interception.