Fig. 1. Seven images of different sizes and types to be encrypted

Fig. 2. Schematic diagram of frequency shift and CGH coding process

Fig. 3. CGH encrypted image

Fig. 4. Improved JTC optical image encryption system

Fig. 5. Optical path of decryption based on 4F system

Fig. 6. (a) Decrypted CGH with noise; (b) CGH after noise removal

Fig. 7. Optical decryption and reconstruction system for the CGH

Fig. 8. Decrypted results with all correct keys

Fig. 9. (a) Decryption result with wrong key p₄; (b) Decryption result with wrong key p₂（a） 错误时的解密结果；（b） 错误时的解密结果