Document Detail


Formal connections between lightness algorithms.
MedLine Citation:
PMID:  3772630     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The computational problem underlying color vision is to recover the invariant surface-spectral-reflectance properties of an object. Lightness algorithms, which recover an approximation to surface reflectance in independent wavelength channels, have been proposed as one method to compute color. This paper clarifies and formalizes the lightness problem by proposing a new formulation of the intensity equation on which lightness algorithms are based and by identifying and discussing two basic subproblems of lightness and color computation: spatial decomposition and spectral normalization of the intensity signal. Several lightness algorithms are reviewed, and a new extension (the multiple-scales algorithm) of one of them is proposed. The main computational result is that each of the lightness algorithms may be derived from a single mathematical formula, under different conditions, which, in turn, imply limitations for the implementation of lightness algorithms by man or machine. In particular, the algorithms share certain limitations on their implementation that follow from the physical constraints imposed on the statement of the problem and the boundary conditions applied in its solution.
Authors:
A Hurlbert
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of the Optical Society of America. A, Optics and image science     Volume:  3     ISSN:  0740-3232     ISO Abbreviation:  J Opt Soc Am A     Publication Date:  1986 Oct 
Date Detail:
Created Date:  1986-12-15     Completed Date:  1986-12-15     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  8402086     Medline TA:  J Opt Soc Am A     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1684-93     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Algorithms
Color Perception*
Humans
Light
Models, Neurological*
Photic Stimulation
Photoreceptor Cells / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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