Metamer density estimated color correction |
| |
Authors: | Philipp Urban Rolf-Rainer Grigat |
| |
Affiliation: | 1. Munsell Color Science Laboratory, Rochester Institute of Technology, 54 Lomb Memorial Drive, Rochester, NY, 14623, USA 2. Vision Systems, Hamburg University of Technology, Harburger Schlo?stra?e 20, 21079, Hamburg, Germany
|
| |
Abstract: | Color correction is the transformation of response values of scanners or digital cameras into a device- independent color
space. In general, the transformation is not unique due to different acquisition and viewing illuminants and non-satisfaction
of the Luther–Ives condition by a majority of devices. In this paper we propose a method that approximates the optimal color
correction in the sense of a minimal mean error. The method is based on a representative set of reflectance spectra that is
used to calculate a special basic collection of device metameric blacks and an appropriate fundamental metamer for each sensor
response. Combining the fundamental metamer and the basic collection results in a set of reflectances that follows the density
distribution of metameric reflectances if calculated by Bayesian inference. Transforming only positive and bounded spectra
of the set into an observer’s perceptually uniform color space results in a point cloud that follows the density distribution
of device metamers within the metamer mismatch space of acqcuisition system and human observer. The mean value of this set
is selected for color correction, since this is the point with a minimal mean color distance to all other points in the cloud.
We present the results of various simulation experiments considering different acquisition and viewing illuminants, sensor
types, noise levels, and existing methods for comparison. |
| |
Keywords: | Color image acquisition Color correction Device metamerism Device characterization |
本文献已被 SpringerLink 等数据库收录! |
|