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Proceedings Paper

A new simultaneous compression and encryption method for images suitable to recognize form by optical correlation
Author(s): Ayman Alfalou; Marwa Elbouz; Maher Jridi; Alain Loussert
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Paper Abstract

In some recognition form applications (which require multiple images: facial identification or sign-language), many images should be transmitted or stored. This requires the use of communication systems with a good security level (encryption) and an acceptable transmission rate (compression rate). In the literature, several encryption and compression techniques can be found. In order to use optical correlation, encryption and compression techniques cannot be deployed independently and in a cascade manner. Otherwise, our system will suffer from two major problems. In fact, we cannot simply use these techniques in a cascade manner without considering the impact of one technique over another. Secondly, a standard compression can affect the correlation decision, because the correlation is sensitive to the loss of information. To solve both problems, we developed a new technique to simultaneously compress & encrypt multiple images using a BPOF optimized filter. The main idea of our approach consists in multiplexing the spectrums of different transformed images by a Discrete Cosine Transform (DCT). To this end, the spectral plane should be divided into several areas and each of them corresponds to the spectrum of one image. On the other hand, Encryption is achieved using the multiplexing, a specific rotation functions, biometric encryption keys and random phase keys. A random phase key is widely used in optical encryption approaches. Finally, many simulations have been conducted. Obtained results corroborate the good performance of our approach. We should also mention that the recording of the multiplexed and encrypted spectra is optimized using an adapted quantification technique to improve the overall compression rate.

Paper Details

Date Published: 24 September 2009
PDF: 8 pages
Proc. SPIE 7486, Optics and Photonics for Counterterrorism and Crime Fighting V, 74860J (24 September 2009); doi: 10.1117/12.830180
Show Author Affiliations
Ayman Alfalou, Institut Superieur de l'Electronique et du Numerique (France)
Marwa Elbouz, Institut Superieur de l'Electronique et du Numerique (France)
Maher Jridi, Institut Superieur de l'Electronique et du Numerique (France)
Alain Loussert, Institut Superieur de l'Electronique et du Numerique (France)

Published in SPIE Proceedings Vol. 7486:
Optics and Photonics for Counterterrorism and Crime Fighting V
Colin Lewis, Editor(s)

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