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. 2 — Feb. 1, 1994
  • pp: 467–478

Shape-from-shading on a cloudy day

M. S. Langer and S. W. Zucker  »View Author Affiliations


JOSA A, Vol. 11, Issue 2, pp. 467-478 (1994)
http://dx.doi.org/10.1364/JOSAA.11.000467


View Full Text Article

Enhanced HTML    Acrobat PDF (1699 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

In the classical shape-from-shading model, surface luminance depends primarily on the unit surface normal. However, under diffuse lighting conditions, such as the sky on a cloudy day, luminance depends primarily on the amount of sky that is visible from each surface element, with surface normal of secondary importance. This claim is formalized in terms of a dominating sky principle and a surface aperture function. An approximately functional constraint between surface luminance and aperture emerges. It is shown how to use this constraint to recover a depth map from an image efficiently. A curious difference from the classical shape-from-shading problem is uncovered. When one assumes a point light source, the local geometric constraints of the shape-from-shading problem lie along the surface. However, in the diffuse-lighting problem, the local geometric constraints are found in a visibility field, which is defined in the free space above the surface.

© 1994 Optical Society of America

History
Original Manuscript: June 22, 1992
Revised Manuscript: March 30, 1993
Manuscript Accepted: July 9, 1993
Published: February 1, 1994

Citation
M. S. Langer and S. W. Zucker, "Shape-from-shading on a cloudy day," J. Opt. Soc. Am. A 11, 467-478 (1994)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-11-2-467

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