Abstract
In holographic encryption, double random-phase encoding in the Fresnel domain (DRPEiFD) is a
prevalent encryption method because it is lensless and secure. However, noises bring adverse effects during
decryption. In this letter, we introduce quick-response (QR) coding during encryption to resist noises. We
transform the original information into a QR code and then encrypt the code as a hologram through DRPEiFD. To
retrieve the input, we decrypt the hologram in the opposite manner to the encryption and subsequently obtain a
QR code with noises. By scanning this code with proper applications in smartphones, we can obtain a noise-free
retrieval. Numerical experiments and images scanned by a smartphone are shown to validate our proposed method.
© 2014 Chinese Optics Letters
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