One-bit representation of a gray-scale nonlinear joint transform correlator

1992 ◽  
Vol 31 (5) ◽  
pp. 888 ◽  
Author(s):  
Bahram Javidi
Keyword(s):  
Joint Transform Correlator ◽  
Gray Scale ◽  
Nonlinear Joint

Characterization of an Optimized Nonlinear Joint Transform Correlator

1994 ◽  
Vol 41 (6) ◽  
pp. 1253-1261
Author(s):  
B.S. Lowans ◽  
B. Bates ◽  
R.G.H. Greer
Keyword(s):  
Joint Transform Correlator ◽  
Nonlinear Joint

scholarly journals Pattern detection using a modified composite filter with nonlinear joint transform correlator

1991 ◽  
Author(s):  
Santiago Vallmitjana ◽  
Ignacio P. Juvells ◽  
Arturo Carnicer ◽  
Juan C. Campos
Keyword(s):  
Pattern Detection ◽  
Joint Transform Correlator ◽  
Composite Filter ◽  
Nonlinear Joint

Application of a wire-grid-mirror liquid-crystal light valve in a nonlinear joint transform correlator

1994 ◽  
Vol 33 (14) ◽  
pp. 2834 ◽  
Author(s):  
Bahram Javidi ◽  
Guanshen Zhang ◽  
Amir H. Faziollahi ◽  
Uzi Efron
Keyword(s):  
Liquid Crystal ◽  
Joint Transform Correlator ◽  
Wire Grid ◽  
Light Valve ◽  
Nonlinear Joint

Binary encoding of gray scale nonlinear joint transform correlators

1991 ◽  
Vol 30 (11) ◽  
pp. 1321 ◽  
Author(s):  
Bahram Javidi ◽  
Qing Tang
Keyword(s):  
Gray Scale ◽  
Binary Encoding ◽  
Nonlinear Joint

scholarly journals Optical Image Encryption Using a Nonlinear Joint Transform Correlator and the Collins Diffraction Transform

Photonics ◽  
2019 ◽  
Vol 6 (4) ◽  
pp. 115 ◽  
Author(s):  
Juan M. Vilardy O. ◽  
Ronal A. Perez ◽  
Cesar O. Torres M.
Keyword(s):  
Fourier Transforms ◽  
Lateral Displacement ◽  
Random Phase ◽  
Design Parameters ◽  
Invariance Property ◽  
Joint Transform Correlator ◽  
Optical Processing ◽  
Optical Wave ◽  
Special Cases ◽  
Nonlinear Joint

The Collins diffraction transform (CDT) describes the optical wave diffraction from the generic paraxial optical system. The CDT has as special cases the diffraction domains given by the Fourier, Fresnel and fractional Fourier transforms. In this paper, we propose to describe the optical double random phase encoding (DRPE) using a nonlinear joint transform correlator (JTC) and the CDT. This new description of the nonlinear JTC-based encryption system using the CDT covers several optical processing domains, such as Fourier, Fresnel, fractional Fourier, extended fractional Fourier and Gyrator domains, among others. The maximum number of independent design parameters or new security keys of the proposed encryption system using the CDT increases three times in comparison with the same encryption system that uses the Fourier transform. The proposed encryption system using the CDT preserves the shift-invariance property of the JTC-based encryption system in the Fourier domain, with respect to the lateral displacement of both the key random mask in the decryption process and the retrieval of the primary image. The viability of this encryption system is verified and analysed by numerical simulations.

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