Fig. 4. (a) Reconstructed image from a hologram generated from the test image in Fig. 3. (b) Reconstructed image from a hologram generated from the test image in Fig. 3 and encrypted with the M-sequence generated by S1ðyÞ. PSNR ¼ 13:1dB. (c) Reconstructed image from a hologram generated from the test image in Fig. 1 and that has been encrypted and decrypted with the same encryption key, S1ðyÞ. The MSE, as compared with the reconstructed image of the unencrypted hologram, is 0. (d) Reconstructed image from a hologram generated from the test image in Fig. 1 and that has been encrypted with the encryption key S1ðyÞ and decrypted with the key S2ðyÞ. PSNR ¼ 16:3dB. (e) Reconstructed image from a hologram generated from the test image in Fig. 3 and that has been encrypted and decrypted with the same encryption key, S3ðyÞ. The key is derived from an eight-taps M-sequence. The MSE, as compared with the reconstructed image of the unencrypted hologram in Fig. 4(a), is 0.
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