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We carried out an experimental set-up for reading a hidden drawing underpapyrus using an optical technique based on the speckle phenomenon that isobserved when a rough surface is illuminated by laser light. We propose the useof several wavelengths of light illumination and adaptive algorithms to processthe speckle images. We employ a set of filters to produce better discriminationof the results as visually judged. This approach is a cheap and relativelysimple non-destructive and non-invasive procedure that could be extended toother painted objects or subsurface hidings of archaeological interest, as wellas, to other dynamic speckle experiments.

Reading hidden writing and drawings on papyrus using speckle optical technique and multispectral images