Hyperspectral Imaging

7 12 2010

The CHICC team have been collaborating with the Sensing, Imaging and Signal Processing Group from the School of Electrical and Electronic Engineering.  Prof. David Foster and research associate Kijiro Amano visited with their hyperspectral imaging system to take images of the 14th century Haggadah held at John Rylands Library, Deansgate.

A hyperspectral camera is like an ordinary colour camera, but rather than sampling just three broad regions of the light spectrum (red, green, and blue), it analyses the spectrum into many closely spaced narrow wavelength bands, providing a detailed description of its reflecting properties.

The results of this collaboration are now with CHICC. The image below is a sample of the analysis on the Haggadah page they imaged.  For each of the areas identified on the Haggadah, the continuous lines in the graphs show the page reflectance at each wavelength and the symbols show the corresponding reflectances of some of the pigment samples. If the lines and symbols overlap, perhaps with a little scaling vertically, then the pigments are a good match.

 

Haggadah pigment analysis

Haggadah pigment analysis

 

As you can see in the image, the reflectance of certain areas of the image can be analysed, making it possible to identify what the pigments in this area are composed of. The fascinating work will allow us to use the correct consolidation techniques on each area of the damaged volume, knowing exactly what materials to use for maximum effect.

Contact: D. H. Foster (0161-306-3888)

Email: d.h.foster@manchester.ac.uk

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