Portable multispectral imaging system based on light-emitting diodes for spectral recovery from 370 to 1630  nm

Abstract

To expand and investigate the potential of spectral imaging, we developed a portable multispectral system using light-emitting diodes. This system recovers spectral information from the UV to the near IR over a large area using two different image sensors synchronized with 23 bands of illumination. The system was assessed for spectral reconstruction through simulations and experimental measurements by means of two methods of spectral reconstruction and three different evaluation metrics. The results over a Macbeth ColorChecker chart and other samples, including pigments usually employed in art paintings, are compared and discussed. The portable multispectral system using LEDs constitutes a cost-effective and versatile method for spectral imaging.

Hyperspectral image reconstruction using Multi-colour and Time-multiplexed LED illumination

“…The use of LEDs makes the system very cost effective and flexible, however, the selection of peak wavelengths is hard-wired and lacks a generalised solution. Herrera-Ramirez et al [15] proposes an LED based system with a considerable broader spectral range of 370 -1630 nm, in which interpolation is used to recover hyperspectral information from 22 wavelengths. While the system is portable and lowcost, interpolation runs the risk of overlooking specific spectral absorption peaks of materials not covered by the illumination source.…”

Metrology and Measurement Systems

“…In a wide range of research and industrial applications multi-emitter LED systems are used to improve quality control and information mining [21][22][23][24]. Complex LED-based lighting systems are also being designed for medical applications in the UV, VIS and IR ranges [25][26][27][28][29][30]: fluorescence microscopy, phase imaging of human cells, detection of skin, tissue and cell dysfunctions by analysis of spectral images. In this paper we present our own construction of a tuneable LEDbased source which intentionally is dedicated to endoscopic applications [31].…”

Artwork imaging from 370 to 1630 nm using a novel multispectral system based on light‐emitting diodes

“…In this article, we report on the use of a LED‐based multispectral system for imaging of paintings. The system encompasses from 370 to 1630 nm, the spectral range capable of providing the most relevant information.…”