Abstract
Compression and encryption/decryption are necessary for secure and efficient
storage and transmission of image data. Optical encryption, as a promising
application of display devices, takes advantage of both the massive parallelism
inherent in optical systems and the flexibility offered by digital electronics.
We encrypt real-world three-dimensional (3D) objects, captured using phase-shift
interferometry, by combining a phase mask and Fresnel propagation. Compression
is achieved by nonuniformly quantizing the complex-valued encrypted digital
holograms using an artificial neural network. Decryption is performed by displaying
the encrypted hologram and phase mask in an identical configuration. We achieved
good quality decryption and reconstruction of 3D objects with as few as 2
bits in each real and imaginary value of the encrypted data.
© 2006 IEEE
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