Ramin Rashidi Alavijeh
Semi-automatic decay detection from hyperspectral images for historical bridge assessment.
Rel. Francesca Matrone, Alessandra Spadaro, Emere Arco. Politecnico di Torino, Corso di laurea magistrale in Digital Skills For Sustainable Societal Transitions, 2025
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Abstract
Hyperspectral imaging (HSI) is an advanced non-destructive evaluation (NDE) technique with significant potential for the Structural Health Monitoring (SHM) of civil infrastructure, particularly aging bridges. By capturing detailed spectral signatures, HSI can identify material degradation, such as efflorescence and moisture, which are often precursors to structural decay and invisible to standard visual inspection. However, a critical barrier to the practical application of HSI is the requisite for robust data pre-processing. Raw sensor data must be corrected for geometric distortions and radiometrically calibrated to produce physically meaningful surface reflectance. This thesis confronts a primary challenge encountered in field-based SHM: a catastrophic failure of the standard Empirical Line Calibration (ELC) workflow, which, upon investigation, was traced to a combination of band-to-band geometric misregistration and metadata-handling errors in the reference spectral libraries.
The primary aim of this thesis is to develop, validate, and optimize a complete and repeatable processing pipeline for the semi-automatic detection of material degradation on historical masonry bridges from ground-based HSI data
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