Axine Labs
Free / commercial imagery

Detección de Anomalías de Objetivos Subpíxel

Anomalías por debajo del tamaño de un píxel: recubrimientos artificiales, materiales de camuflaje y objetos de baja fracción de llenado.

Detección de anomalías contra un fondo estimado localmente, para materiales artificiales más pequeños que un píxel.

Detección de Anomalías de Objetivos Subpíxel
In view

Sub-pixel anomaly response over mixed ground, where a target occupies part of a pixel rather than all of it.

QUÉ ENCUENTRA

Qué detecta.

MaterialEntorno típicoQué puede confundirlo
Man-Made Materials & Camouflage FabricsTactical terrain, infrastructure security, and border surveillance zonesDense natural canopy shadowing and bright specular reflections

MÉTODO

Cómo funciona.

Entra reflectancia calibrada, y cada píxel se ajusta contra una biblioteca pública de referencia.

01Step 1

Background covariance estimation

Local and scene-wide background covariance are computed across the contiguous channels. How well this works depends on how many distinct materials the background already contains.

02Step 2

Reed-Xiaoli anomaly detection

Measures how far each pixel sits from its surrounding background in spectral distance, with the false alarm rate held constant rather than the threshold.

03Step 3

Constrained energy minimisation

A filter that passes a chosen target signature at unit gain while suppressing everything else. It needs a signature to look for, which is the difference between this and plain anomaly detection.

04Step 4

Abundance and coordinates

Surviving pixels carry an estimated abundance and a location, and each export records the confidence attached to it.

ESPECIFICACIONES

Qué obtiene, y sobre qué corre.

Valores entregadosDetector response and estimated abundance, floating point
SalidaSub-pixel anomaly layer
Plazo de entregaQuoted with the order once this moves out of development
Formatos
GeoJSON Target AlertsCloud-Optimized GeoTIFF (COG)Provenance record (detector version, background window, scene ids)

Condiciones que necesita

Sun angle limit:55°
Cloud cover limit:5%
Vegetation cover limit:50%

Method and checks are documented in Axine Applied Spectroscopy Technical Whitepaper · Series 6.

Leer el artículo

Alcance

Exploratory. Detection degrades as the background gets more varied and as the target fills less of a pixel.