CIOP   05384
CENTRO DE INVESTIGACIONES OPTICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Multiplexing technique based on the lacunarity of fractal encrypting masks
Autor/es:
MYRIAN TEBALDI; DAFNE AMAYA; WALTER FURLAN; JUAN MONSORIU; ROBERTO TORROBA; NESTOR BOLOGNINI
Lugar:
Lima
Reunión:
Congreso; VII Reunión Iberoamericana de Óptica (VII RIAO) y X Encuentro Latinoamericano de Óptica, Láseres y sus Aplicaciones (X OPTILAS); 2010
Institución organizadora:
Pontificia Universidad Católica del Perú
Resumen:
We have recently presented a new architecture for optical encryption system based on a Joint Transform Correlator (JTC) setup and Fractal Zone Plate (FZP) keys. The JTC can be used as an encoding technique that solves the alignment problem inherent to the double random phase encoding scheme. Besides we use FZP acting as the normal encoding mask under JTC srchitecture. The complexity exhibited by fractal masks allows including them as secure keys that are an alternative to conventional random phase masks. The FZP has a free design parameter (the lacunarity) that modifies the number of foci of a FZP and their relative amplitude. In this contribution we expand the possibilities of the technique to the multiplexing capability. By varying the lacunarity every time we insert a different input object, we generate different encrypting masks, allowing a multiplexing procedure. The input images are encrypted to a stationary white noise as in the usual double random encoding. The use of FZP keys would allow the employment of spatial light modulators to display them, thus resulting in easily reconfigurable optical encryption systems. We present experimental results that support our proposal.