Abstract

Optical properties of radially polarized light generated by liquid crystal (LC) polarization-converting devices with two LC molecular orientations 180° and ±90° twist modes) are measured and the applicability to optical wavelet transforms (WTs) are discussed. It is found that the radially polarized lights in both the ±180° and ±90° twist modes can be regarded as wavelets. Based on the principle of WT, feature extractions of a simple binary image are carried out by applying the LC polarization-converting device to a shadow-casting system. Unique feature extraction properties of the shadow-casting system using the LC polarization-converting device and a LC microlens array are discussed. It is experimentally confirmed that edge and corner features are successfully extracted using the LC polarization-converting device with ±180° and ±90° twist modes, respectively.

© 2006 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Joint wavelet-transform correlator for image feature extraction

Wenlu Wang, Guofan Jin, Yingbai Yan, and Minxian Wu
Appl. Opt. 34(2) 370-376 (1995)

Improved feature extraction by use of a joint wavelet transform correlator

Boon Yi Soon, Mohammad S. Alam, and Mohammad A. Karim
Appl. Opt. 37(5) 821-827 (1998)

Optical wavelet transform by the phase-only joint-transform correlator

Peter S. Erbach, Don A. Gregory, and Xiangyang Yang
Appl. Opt. 35(17) 3117-3126 (1996)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

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

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 OSA member, or as an authorized user of your institution.

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

Figures (7)

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

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

Equations (22)

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

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

Metrics

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

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