The suppression of leakage current in the solid phase crystallized silicon (SPC-Si) TFT employing off-state bias anneali
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Formation of Hyperspectral Near-Infrared Images from Artworks Juan Torres1, Carmen Vega1, Tomás Antelo2, José Manuel Menéndez1, Marian del Egido2, Miriam Bueso2 & Alberto Posse1 1 Grupo de Aplicación de Telecomunicaciones Visuales, Universidad Politécnica de Madrid. Av. Complutense, nº 30, E28040 Madrid, Spain. e-mail: [email protected] 2 Instituto del Patrimonio Cultural de España, Ministerio de Cultura, C/ Pintor El Greco, 4, E28040 Madrid, Spain. ABSTRACT In this paper, a novel hyperspectral image acquisition system able to obtain a set of narrowband images (~2,25 nm of bandwidth) and the related composition of monochrome images in the near-infrared is described. The aim of this system is to discriminate the materials by their optical spectral response in the range of 900-1700 nm. This system has been developed in the framework of a collaborative project that includes the improvement of the automatic composition of reflectographic mosaics in order to study the underdrawing of large formats big artworks in real-time. The main features of this project are detailed in this paper. Furthermore, a few enlightening results of the hyperspectral system and new lines of research are shown. INTRODUCTION The Physics Studies Department of the Instituto del Patrimonio Cultural de España (IPCE) is devoted to the artwork study using non-invasive techniques, such as image processing in several spectral ranges. The conservation and restoration criteria of the cultural heritage demand more and more a minimum intervention in the artwork. For this reason, the Computer Vision systems are very important because, in such systems, invasive sample taking is not required. In addition, they help determining more effectively the sample taking areas. Among the set of techniques used in this Department, within the VARIM project [1-4] and in collaboration with the Visual Telecommunications Application Group of the Universidad Politécnica de Madrid (UPM), the infrared reflectography has been an increasing issue. Among the reached targets are the construction of an acquisition robot and the complete automation of the reflectographic mosaic composition. Thanks to this development, the study of the underdrawing of big artworks has been possible, in such as a set of Spanish altarpieces from the XV and XVII century without moving or dismantles any painting. The availability of better sensor devices able to detect wavelengths in the near-infrared (composed by Indium, Gallium and Arsenic - InGaAs) which replace the old ones (composed mainly by lead sulphide) also implies the possibility to develop more precise and faster image acquisition systems. This fact, and the experience acquired along the last five years, lead to create a new project, composed by the IPCE and the UPM, with the aim of carrying out image spectroscopy within the 900-1700 nm range around 2,25 nm of bandwidth each image. Thus, a great effort has been carried out developing on the one hand the acquisition system and the composition of the spectral bands and, on the other hand, the a
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