In this paper we extend double random phase encryption (DRPE) using
orthogonal encoding from single-image transmission to multiple-image transmission.
The orthogonal encoding for multiple images employs a larger Hadamard matrix than
that for a single image, which can improve security. We provide a scheme for DRPE
with an orthogonal codec, and a method for orthogonal encoding/decoding for
multiple-image transmission. Finally, simulation results verify that the DRPE using
orthogonal encoding for multiple images is more secure than both the conventional
DRPE and the DRPE using orthogonal encoding for a single image.
© 2014 Optical Society of Korea
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