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The MAGIC behind MSI

MSI in a wide range of applications

  • Analysis of documents - Readability of text on parchment, scrolls, and paper, often in poor condition is one application.
  • Analysis of polychrome surfaces such as paintings - on canvas, wood, stone, and other materials. Applications include non-invasive analysis for conservation work and authentication.
  • Analysis of Fabrics of all kinds - such as historic research to determine age and material.
  • Police, forensic and crime scene investigation. Analysis for residue of human fluids on fabric, fingerprints, marks from use of weapons, and crime scene evidence. 
  • Materials characterization and sorting. Applications include quality assurance, research and evelopment of new materials, and analysis for machine vision.
  • General: MSI is used to differentiate subject matter based upon the differentiated response from materials with different chemical compositions.

MSI outstanding benefits for analysis

  • Non-invasive contactless analysis
  • Quick first step for further analysis – Do it once, do it right
  • Nondestructive thanks to low energy LED lighting
  • Modular and mobile capturing solutions

The “Magic” behind MSI

  • The growth of multispectral Imaging applications is based upon the use of new developments within LED lighting, wide spectrum and high-resolution digital camera sensors, as well as conservation methodology.
  • LED lighting can be specified to deliver select “slices”, or bands, of the spectrum from UV light, through visible light and into IR light.
  • In a darkened studio, LED lighting in combination with filters in front of the camera is used to capture two types of images.
  • Images of reflected light: The different light bands enter into the surface of the subject matter and are reflected from different layers. Characteristics are then captured of the visible top surface, and of the layers below, to reveal information about, for example, earlier text scraped away on parchment and palimpsests, paints used, re-touching, underdrawings, state of conservation etc.
  • Images of photo-induced luminescence: A given wavelength of light induces energy in the subject-matter and can result in luminescence, showing up as illuminations in a longer wavelength. The term “luminescence” also includes fluorescence. The luminescence is captured by filtering away the reflected shorter original wavelength, by using filters in front of the camera.
  • Captured image stacks are analyzed visually or by scientific methods used to discover or enhance content in the subject matter. The calibration steps are based on well-defined standards and targets.
  • Scientific methods include libraries for statistical analysis of the stack, typically Principal Component Analysis. Matlab and Paleo Toolbox are two examples of such libraries.
  • For visual analysis, Rainbow software has presets according to the CHARISMA project manual made by British Museum in collaboration with EU partners.

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