Abstract
We propose a new 2-step phase-shifting digital holographic optical encryption
technique and analyze tolerance error for this cipher system. 2-step phase-shifting
digital holograms are acquired by moving the PZT mirror with phase step of 0 or
π/2 in the reference beam path of the Mach-Zehnder type
interferometer. Digital hologram with the encrypted information is Fourier transform
hologram and is recorded on CCD camera with 256 gray-level quantized intensities.
The decryption performance of binary bit data and image data is analyzed by
considering error factors. One of the most important errors is quantization error in
detecting the digital hologram intensity on CCD. The more the number of quantization
error pixels and the variation of gray-level increase, the more the number of error
bits increases for decryption. Computer experiments show the results to be carried
out encryption and decryption with the proposed method and the graph to analyze the
tolerance of the quantization error in the system.
© 2011 Optical Society of Korea
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