Translator Disclaimer
2 November 2000 Nonlinear correlation with Gaussian filtering in the Fourier domain
Author Affiliations +
The performance of nonlinear joint transform correlators (JTCs) are experimentally tested with respect to in-plane and out-of-plane rotation distortions. Optical experiments are presented for both linear and nonlinear joint transform correlators. The robustness of these systems to rotation distortions is investigated. The results show that nonlinear JTCs perform similarly to linear JTCs in the presence of out- of-plane rotation distortions, but that nonlinear JTCs are more sensitive than linear JTCs to in-plane rotation distortions. However, it is well known that nonlinear JTCs have the desirable properties of illumination tolerance and discrimination sensitivity. To reduce the sensitivity of nonlinear JTCs to in-plane rotation distortions, the nonlinear joint power spectrum is multiplied by a circularly symmetric Gaussian function. This is equivalent to applying a Gaussian filter to the nonlinear JTC output. The experimental results show that using such a Gaussian filter provides nonlinear JTCs with similar in-plane rotation tolerance to that of linear JTCs.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sherif Kishk, Steven Verrall, and Bahram Javidi "Nonlinear correlation with Gaussian filtering in the Fourier domain", Proc. SPIE 4113, Algorithms and Systems for Optical Information Processing IV, (2 November 2000);

Back to Top