Cryptography – By modifying optical image
Patent
1998-12-23
1999-12-14
Barron, Jr., Gilberto
Cryptography
By modifying optical image
380 6, 380 7, 359 29, H04L 910, G09C 500
Patent
active
060027738
ABSTRACT:
A method and apparatus of encrypting optical images and storing these images in memory using random phase encoding is presented. The encryption technique uses random phase encoding in both the input plane and the Fourier plane. Each image is encrypted and can be read out by a unique code or a universal code. The image to be encrypted is first multiplied by a random phase function. The Fourier transform of the product of the image and the random phase function is then multiplied by another random phase function in the Fourier domain. Taking the inverse Fourier transform, an encrypted image in the output plane is obtained. Each encrypted image can be stored in optical memory. The encryption process of the present invention can be done optically or electronically with one or two dimensional functions for encryption. Further, the image can be phase encoded (optically or digitally) prior to the encryption process, with a phase reading technique employed to obtain the original decrypted image. Also, a joint transform correlator may be used for the encryption and/or decryption of the present invention. It will be appreciated that a variety of well known methods can be used to store or display the encrypted images.
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Bahram Javidi, Joseph L. Horner, "Optical pattern recognition for validation and security verification", Jun. 1997/vol. 33 No. 6; pp. 1752-1756.
Philippe Refregier, Bahram Javidi, "Optical image encryption based on input plane and Fourier plane random encoding", Apr. 1, 1995/vol. 20, No. 7; pp. 767-769.
Barron Jr. Gilberto
Darrow Justin T.
The University Of Connecticut
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