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23 September 2005 Three-dimensional image encryption, transmission, and processing by using digital holography
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We describe several methods for optoelectronic processing of 3D images based in digital holography. In all cases, phase-shift digital holography is used to record the complex amplitude distribution associated to the diffraction field generated by 3D objects illuminated with coherent light. First, we review a technique to encrypt a 3D image by using digital holography. Encryption is performed by using random phase codes as key functions. In this way, it is possible to send secure 3D information through conventional digital communication lines. In our approach, decryption is carried out digitally. Next we describe both, digital and optical reconstruction of 3D images starting from digital holograms. Finally, we show how to perform 3D pattern recognition with high discrimination based in the above techniques. Experimental results are presented.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Bahram Javidi, Enrique Tajahuerce, Thomas J. Naughton, Yann Frauel, and Osamu Matoba "Three-dimensional image encryption, transmission, and processing by using digital holography", Proc. SPIE 5954, Optical Security Systems, 595403 (23 September 2005);

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