PreprintCC BY 4.0arXiv
Efficient spectral unmixing using endmember variability
Abstract
A mixed signal vector composed of a weighted sum of random, unobserved endmember vectors has a mean and a variance that both depend on the unknown weights. This suggests that linear estimates of the weights based on the mean model are likely to be inefficient, and could possibly be improved upon by estimates that also make use of the variance model. In the context of a latent factor model for source variability, we calculate theoretically how much information is available in the variance model, and show how this information may stabilize inference in the case of an ill-conditioned mean model. We show through several data examples that utilization of the variance model is likely to improve parameter estimation in real-world scenarios.
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BibTeX
@misc{bryan2026efficient,
title = {{Efficient spectral unmixing using endmember variability}},
author = {Jordan Bryan and Peter Hoff and Galen Reeves},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.23793},
eprint = {2610.23793},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.23793},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Efficient spectral unmixing using endmember variability
AU - Jordan Bryan
AU - Peter Hoff
AU - Galen Reeves
PY - 2026
DA - 2026/10/16
PB - arXiv
DO - 10.48550/arxiv.2610.23793
UR - https://arxiv.org/abs/2610.23793
AB - A mixed signal vector composed of a weighted sum of random, unobserved endmember vectors has a mean and a variance that both depend on the unknown weights. This suggests that linear estimates of the weights based on the mean model are likely to be inefficient, and could possibly be improved upon by estimates that also make use of the variance model. In the context of a latent factor model for source variability, we calculate theoretically how much information is available in the variance model, and show how this information may stabilize inference in the case of an ill-conditioned mean model. We show through several data examples that utilization of the variance model is likely to improve parameter estimation in real-world scenarios.
ER -