Performance characterization of an imaging spectrograph for the acquisition and analysis of multispectral images

This paper presents a performance characterization of the Specim ImSpector V10[1] used as the core of a spectral camera for the acquisition and analysis of works of art. The Specim ImSpector is an imaging spectrograph generally used for colorimetry applications. Our purpose is to employ it for the analysis of the spectral content in the visible and near infrared spectrum of a fragment of the mosaic of St.Mark´s Basilica in Venice (Italy). After spectral calibration, we assessed the system performance by acquiring a set of calibrated tiles under different illumination sources. The best results were obtained by combining the spectral reflectances measured with a lithium lamp and with a common incandescence bulb.