Optical EngineeringEnhancement of signal-to-noise ratio of a double random phase encoding encryption system
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The tolerance to data loss of a double random phase encoding encryption system is studied, and the signal-to-noise ratio (SNR) of the decrypted image is investigated when part of the encrypted image is lost. In electronic implementation, the SNR will be enhanced by reducing the ratio of the sampling number of the image to the total sampling number. In optical implementation, the SNR can be increased by using a phase mask with higher spatial frequency. Both the theory and computer simulations are demonstrated.