OSA's Digital Library

Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 11, Iss. 11 — Nov. 1, 1994
  • pp: 2935–2945

Polarization camera for computer vision with a beam splitter

Lawrence B. Wolff  »View Author Affiliations


JOSA A, Vol. 11, Issue 11, pp. 2935-2945 (1994)
http://dx.doi.org/10.1364/JOSAA.11.002935


View Full Text Article

Enhanced HTML    Acrobat PDF (1875 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

A fully automated system that utilizes two CCD cameras and a polarizing beam splitter to create a polarization camera capable of sensing the polarization of reflected light from objects at pixel resolution is presented. The physical dimensions of the polarization of light beyond that of intensity carry extra information from a scene that can provide a richer set of descriptive physical constraints for the understanding of images. It has been shown that polarization cues can be used to perform dielectric and metal material identification and specular-and diffuse-reflection component analysis, as well as complex image segmentations that would be immensely more complicated or even infeasible with the use of intensity and color alone. A polarizing-plate beam splitter is placed in front of two CCD cameras so that light beams reflected from and transmitted through the beam splitter are each incident upon a separate camera. The polarization state of the reflected and the transmitted beams are linearly independent in terms of two orthogonal-polarization components, and these components are resolved in real time from the simple solution of two simultaneous linear equations. The polarizing-plate beam splitter allows for the simultaneous measurement of two orthogonal-polarization components over fairly wide field views suitable for vision and robotics. A polarization contrast image can be produced at 15 Hz. Two sets of orthogonal-polarization component pairs can be resolved by electronically switching a twisted nematic liquid crystal placed in front of the beam splitter, permitting the real-time measurement of partial-linear-polarization images at 7.5 Hz. A scheme for mapping states of partial linear polarization into hue, saturation, and intensity, which is a very suitable representation for a polarization image, is illustrated. The unique vision-understanding capabilities of this polarization camera system are demonstrated with experimental results showing polarization-based dielectric and metal material classification, shape constraints from reflected polarization, and specular-reflection and occluding-contour segmentations in a fairly complex scene.

© 1994 Optical Society of America

History
Original Manuscript: July 22, 1993
Revised Manuscript: June 20, 1994
Manuscript Accepted: June 29, 1994
Published: November 1, 1994

Citation
Lawrence B. Wolff, "Polarization camera for computer vision with a beam splitter," J. Opt. Soc. Am. A 11, 2935-2945 (1994)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-11-11-2935

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.

If you are accessing the full text through a member bundle, please use the Enhanced HTML link to gain access to the citation lists and other restricted features. Note that accessing both the PDF and HTML versions of an article will count as only one download against your account.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

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.

If you are accessing the full text through a member bundle, please use the Enhanced HTML link to gain access to the citation lists and other restricted features. Note that accessing both the PDF and HTML versions of an article will count as only one download against your account.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

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.

If you wish to use one of your free member downloads to view the figures, click "Enhanced HTML" above and access the figures from the article itself or from the navigation tab.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

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.

If you are accessing the full text through a member bundle, please use the Enhanced HTML link to gain access to the citation lists and other restricted features. Note that accessing both the PDF and HTML versions of an article will count as only one download against your account.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited