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.
Keywords (OCIS): Artificial neural network (ANN), digital holography,
image compression, optical encryption, three-dimensional
(3D) image processing.
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© IEEE/OSA.
