Search Results for author: Sam L. Polk

Found 8 papers, 5 papers with code

Superpixel-based and Spatially-regularized Diffusion Learning for Unsupervised Hyperspectral Image Clustering

1 code implementation24 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.

Clustering graph construction +2

Unsupervised Spatial-spectral Hyperspectral Image Reconstruction and Clustering with Diffusion Geometry

no code implementations28 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.

Clustering Image Reconstruction

Active Diffusion and VCA-Assisted Image Segmentation of Hyperspectral Images

1 code implementation13 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.

Active Learning Clustering +2

Unsupervised Diffusion and Volume Maximization-Based Clustering of Hyperspectral Images

1 code implementation18 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.

Clustering Image Clustering

A Multiscale Environment for Learning by Diffusion

1 code implementation31 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.

Clustering Computational Efficiency

The Nonuniversality of Wealth Distribution Tails Near Wealth Condensation Criticality

no code implementations26 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.

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