Automatic Detection of Collagen Fibres Shrinkage Activity Using Σ-Δ Filtering (original) (raw)

Abstract

The thermally-induced structural collapse of collagen fibres in collagen-based historical materials and artefacts such as leather, parchment and skin is currently measured through the Micro Hot Table (MHT) method. This method, widely used in conservation-restoration for characterising historical materials' deterioration, is based on a combined thermal and microscopic technique which evaluates the motion behaviour of the collagen fibres dispersed in aqueous milieu and heated at 2°C/min inside a thermostatically controlled heating cell. The collagen fibre motion observed by a stereomicroscope and digitally-recorded with a camera is called shrinkage activity and has been defined by a sequence of five temperature intervals. The intrinsic main limitations of this method, i.e. time consuming and human eye assessment variability causing high errors and making it impossible the inter-laboratory comparison, can be overcome by the use of image processing techniques for the automatic detec...

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