Spectral-Based Illumination Estimation and Color Correction
Spectral-Based Illumination Estimation and Color Correction
复制标题
基于光谱的照明估计和颜色校正
DOI:
--
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发表时间:
1999
期刊:
影响因子:
--
通讯作者:
M. Hauta
中科院分区:
文献类型:
--
作者:
R. Lenz;P. Meer;M. Hauta
We present a statistical technique to characterize the global color distribution in an image. The result can be used for color correction of a single image and for com- parison of different images. It is assumed that the object colors are similar to those in a set of colors for which spectral reflectances are available (in our experiments we use spectral measurements of the Munsell and NCS color chips). The logarithm of the spectra can be approximated by finite linear combinations of a small number of basis vec- tors. We characterize the distributions of the expansion coefficients in an image by their modes (the most probable values). This description does not require the assumption of a special class of probability distributions and it is insen- sitive to outliers and other perturbations of the distribu- tions. A change of illumination results in a global shift of the expansion coefficients and, thus, also their modes. The recovery of the illuminant is thus reduced to estimating these shift parameters. The calculated light distribution is only an estimate of the true spectral distribution of the illuminant. Direct inverse filtering for normalization may lead to undesirable results, since these processes are often ill-defined. Therefore, we apply regularization techniques in applications (such as automatic color correction) where visual appearance is important. We also demonstrate how to use this characterization of the global color distribution in an image as a tool in color-based search in image databases. © 1999 John Wiley & Sons, Inc. Col Res Appl, 24, 98 -111, 1999
DOI:
10.1364/josaa.11.002389
发表时间:
1994-09-01
影响因子:
1.9
作者:
DZUMRA, M;IVERSON, G
通讯作者:
IVERSON, G
DOI:
10.1364/josaa.3.000029
发表时间:
1986-01-01
影响因子:
1.9
作者:
MALONEY, LT;WANDELL, BA
通讯作者:
WANDELL, BA
DOI:
10.1364/josaa.10.002166
发表时间:
1993-10-01
影响因子:
1.9
作者:
DZMURA, M;IVERSON, G
通讯作者:
IVERSON, G