Multispectral system for the reflectance reconstruction and color visualization of natural and manufactured objects in the near-infrared region

Abstract

In this study we analyze the performance of a multispectral system that works in the nearinfrared region of the electromagnetic spectrum (NIR, 800-1000 nm). This system, which uses a conventional CCD camera with five acquisition channels as a sensor, is capable of reconstructing the NIR spectral reflectances of the samples analyzed and also provides pseudo-colored images of the scenes registered. The system was tested using a wide range of samples, which included natural and manufactured objects, with different spectral reflectance curves in the NIR. The results show the potential of the system developed in this study for obtaining information relating to spectral reflectance curves. Furthermore, the pseudo-colored images provided permit one to obtain a visualization of the region considered carrying spectral information or maximizing the color differences in order to discriminate between samples with the same appearance in the visible range but different spectra in the NIR.