Infrared Thermal Imaging for Use in Restoration of Defaced Serial Numbers

A grant report funded and recently released by the National Institute of Justice focuses on research that aimed to determine if infrared imaging techniques complemented with multivariate image processing could be used to recover defaced serial numbers.

According to the report, "The three thermographic techniques examined — Transient Infrared Thermography (TIT), Pulsed Infrared Thermography (PIT) and Lock-in Thermography (LIT) — use an infrared camera to detect differences in the thermal conductivity of a metal object in areas that are relatively pristine, as compared to areas deformed by the stamping or engraving of a serial number.

"Success with TIT and PIT measurements was limited, with the best results achieved using LIT along with a fusion of all similarity measures."

The report is authored by Rene Rodriguez, LIsa Lau, Ikwulono Unobe, John Kalivas, and Andrew Sorensen.

Download the full report here.

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