Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Influence of flatness distortion on the output of a liquid-crystal-television-based joint transform correlator system

Not Accessible

Your library or personal account may give you access

Abstract

The use of liquid-crystal panels from a commercially available Sanyo video projector as spatial light modulators in a standard joint transform correlator system is investigated. It is found that the flatness distortion of the panels disturbs the output correlation signal in general. Since the reported solutions for the flatness corrections are either expensive (liquid gates) or suffer from low light efficiency (holographic techniques), we have investigated a possibility to minimize the influence of these distortions on the correlation output without flatness correction. First, we quantify optical flatness across the transparent panel area, and then we measure the effects of flatness distortion by changing the display location of the input objects and the resulting joint power spectrum. It is found that the correlation peak is 1 order of magnitude more sensitive to phase distortions of the input scene than to the same distortions of the joint power spectrum. Choosing the flattest location on the panel allows the utilization of the panels to be demonstrated through recognition of cuneiform inscription signs.

© 1997 Optical Society of America

Full Article  |  PDF Article
More Like This
Distortion-invariant fringe-adjusted joint transform correlation

Mohammad S. Alam, Xue-wen Chen, and Mohammad A. Karim
Appl. Opt. 36(29) 7422-7427 (1997)

Multiple-target detection with use of a modified amplitude-modulated joint transform correlator

Xianlie Huang, Hongkai Lai, and Zehua Gao
Appl. Opt. 36(35) 9198-9204 (1997)

Color image recognition by use of a joint transform correlator of three liquid-crystal televisions

Mei-Li Hsieh, Ken Y. Hsu, and Hongchen Zhai
Appl. Opt. 41(8) 1500-1504 (2002)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (9)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (4)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (11)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved