SIRIS: a high resolution scanning infrared camera for examining paintings

Saunders, D, Atkinson, N, Cupitt, J, Liang, H ORCID: 0000-0001-9496-406X, Sawyers, C and Bingham, R, 2005. SIRIS: a high resolution scanning infrared camera for examining paintings. Proceedings of SPIE - The International Society for Optical Engineering, 5857. ISSN 0277-786X

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Abstract

The new SIRIS (Scanning InfraRed Imaging System) camera developed at the National Gallery in London allows highresolution images of paintings to be made in the near infrared region (900–1700 nm). Images of 5000 × 5000 pixels are made by moving a 320 × 256 pixel InGaAs array across the focal plane of the camera using two orthogonal translation stages. The great advantages of this camera over scanning infrared devices are its relative portability and that image acquisition is comparatively rapid – a full 5000 × 5000 pixel image can be made in around 20 minutes. The paper describes the development of the mechanical, optical and electronic components of the camera, including the design of a new lens. The software routines used to control image capture and to assemble the individual 320 × 256 pixel frames into a seamless mosaic image are also mentioned. The optics of the SIRIS camera have been designed so that the camera can operate at a range of resolutions; from around 2.5 pixels per millimetre on large paintings of up to 2000 × 2000 mm to 10 pixels per millimetre on smaller paintings or details of paintings measuring 500 × 500 mm. The camera is primarily designed to examine underdrawings in paintings; preliminary results from test targets and paintings are presented and the quality of the images compared with those from other cameras currently used in this field.

Item Type: Journal article
Publication Title: Proceedings of SPIE - The International Society for Optical Engineering
Creators: Saunders, D., Atkinson, N., Cupitt, J., Liang, H., Sawyers, C. and Bingham, R.
Date: 2005
Volume: 5857
ISSN: 0277-786X
Identifiers:
NumberType
10.1117/12.612086DOI
Rights: Copyright © 2005 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Divisions: Schools > School of Science and Technology
Depositing User: EPrints Services
Date Added: 09 Oct 2015 10:43
Last Modified: 09 Jun 2017 13:37
URI: http://irep.ntu.ac.uk/id/eprint/17062

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