A study into fingermarks at activity level on pillowcases
Anouk de Ronde (Hogeschool van Amsterdam, Vrije Universiteit Amsterdam, Nederlands Forensisch Instituut (NFI))
Marja van Aken (Nederlands Forensisch Instituut (NFI))
Marcel de Puit (Nederlands Forensisch Instituut (NFI), TU Delft - OLD ChemE/Organic Materials and Interfaces)
Christianne de Poot (Hogeschool van Amsterdam, Vrije Universiteit Amsterdam)
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Abstract
In this paper, we describe a promising method to evaluate the location of fingermarks on two-dimensional objects, which provides valuable information for the evaluation of fingermarks at activity level. For this purpose, an experiment with pillowcases was conducted at the Dutch music festival Lowlands, to test whether the activity ‘smothering’ can be distinguished from an alternative activity like ‘changing a pillowcase’ based on the touch traces on pillowcases left by the activities. Participants performed two activities with paint on their hands: smothering a victim with the use of a pillow and changing a pillowcase of a pillow. The pillowcases were photographed and translated into grid representations. A binary classification model was used to classify the pillowcases into one of the two classes of smothering and changing, based on the distance between the grid representations. After applying the fitted model to a test set, we obtained an accuracy of 98.8%. The model showed that the pillowcases could be well separated into the two classes of smothering and changing, based on the location of the fingermarks. The proposed method can be applied to fingermark traces on all two-dimensional items for which we expect that different activities will lead to different fingermark locations.
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