1 code implementation • 24 Dec 2023 • Kangning Cui, Ruoning Li, Sam L. Polk, Yinyi Lin, Hongsheng Zhang, James M. Murphy, Robert J. Plemmons, Raymond H. Chan
However, the high dimensionality, presence of noise and outliers, and the need for precise labels of HSIs present significant challenges to HSIs analysis, motivating the development of performant HSI clustering algorithms.
no code implementations • 28 Apr 2022 • Kangning Cui, Ruoning Li, Sam L. Polk, James M. Murphy, Robert J. Plemmons, Raymond H. Chan
DSIRC then locates high-density, high-purity pixels far in diffusion distance (a data-dependent distance metric) from other high-density, high-purity pixels and treats these as cluster exemplars, giving each a unique label.
no code implementations • 19 Apr 2022 • Sam L. Polk, Aland H. Y. Chan, Kangning Cui, Robert J. Plemmons, David A. Coomes, James M. Murphy
Ash dieback (Hymenoscyphus fraxineus) is an introduced fungal disease that is causing the widespread death of ash trees across Europe.
1 code implementation • 13 Apr 2022 • Sam L. Polk, Kangning Cui, Robert J. Plemmons, James M. Murphy
Hyperspectral images encode rich structure that can be exploited for material discrimination by machine learning algorithms.
1 code implementation • 18 Mar 2022 • Sam L. Polk, Kangning Cui, Aland H. Y. Chan, David A. Coomes, Robert J. Plemmons, James M. Murphy
Hyperspectral images taken from aircraft or satellites contain information from hundreds of spectral bands, within which lie latent lower-dimensional structures that can be exploited for classifying vegetation and other materials.
1 code implementation • 29 Mar 2021 • Sam L. Polk, James M. Murphy
Clustering algorithms partition a dataset into groups of similar points.
1 code implementation • 31 Jan 2021 • James M. Murphy, Sam L. Polk
To efficiently learn the multiscale structure observed in many real datasets, we introduce the Multiscale Learning by Unsupervised Nonlinear Diffusion (M-LUND) clustering algorithm, which is derived from a diffusion process at a range of temporal scales.
no code implementations • 26 Jun 2020 • Sam L. Polk, Bruce M. Boghosian
In this work, we modify the affine wealth model of wealth distributions to examine the effects of nonconstant redistribution on the very wealthy.