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

Color invariant for daylight changes: relaxing the constraints on illuminants

Not Accessible

Your library or personal account may give you access

Abstract

We extend previous work that addressed the problem of color changes on reflective surfaces resulting from changes in the daylight spectrum. In that work, we constrained the illuminants to a family represented by the Wien approximation to Planck’s formula in order to derive a function of the three camera outputs that is invariant to daylight changes. In this work, we show that the constraint on the form of the illuminants can be relaxed and that a much more general form is permissible. We use principal components analysis on the logarithm of the illumination to represent the CIE standard in the more general form and show that the result closely represents the standard. We recalculate the exponent used in the invariant for our camera from the extended theory and obtain a result that duplicates the one found by empirical means used in our previous work.

© 2001 Optical Society of America

Full Article  |  PDF Article
More Like This
Spectral invariance under daylight illumination changes

John A. Marchant and Christine M. Onyango
J. Opt. Soc. Am. A 19(5) 840-848 (2002)

Shadow-invariant classification for scenes illuminated by daylight

John A. Marchant and Christine M. Onyango
J. Opt. Soc. Am. A 17(11) 1952-1961 (2000)

Color and spectral analysis of daylight in southern Europe

Javier Hernández-Andrés, Javier Romero, Juan L. Nieves, and Raymond L. Lee
J. Opt. Soc. Am. A 18(6) 1325-1335 (2001)

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 (3)

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

Equations (15)

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