Physics-Guided Regime Unmixing

• URL: http://arxiv.org/abs/2605.04247v1
• Date: Tue, 05 May 2026 19:32:21 GMT
• Title: Physics-Guided Regime Unmixing
• Abstract summary: We propose Physics-Guided Regime Unmixing (PGRU), which estimates a pixel-wise scalar from observable physical features to activate nonlinear mixing only where justified.<n>Experiments on Samson, Jasper Ridge, and Urban show consistent improvements over baselines, with physical coherence $> 0.90$.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The Linear Mixing Model (LMM) dominates spectral unmixing for its simplicity, but fails under multiple scattering; existing nonlinear models compensate by applying a fixed regime uniformly across entire scenes. We propose Physics-Guided Regime Unmixing (PGRU), which estimates a pixel-wise scalar $ξ_i \in [0,1]$ from observable physical features to activate nonlinear mixing only where justified. Residuals from the Generalized Bilinear Model (GBM), the Post-Nonlinear Mixing Model (PPNM), and Hapke are combined via learned attention, yielding interpretable regime maps. Experiments on Samson, Jasper Ridge, and Urban show consistent improvements over baselines, with physical coherence $ρ> 0.90$.

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