Hess, M; (2015) A metric test object informed by user requirements for better 3D recording of cultural heritage artefacts. Doctoral thesis , UCL (University College London).

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Abstract

This research is motivated by the potential of digital technologies for 3D optical surface recording of museum artefacts and cultural heritage, and aims to enable heritage professionals to produce fit-for-purpose 3D digital records for research. The thesis is considering the idea if a digital surrogate object can be indistinguishable from the original against both qualitative and quantitative metric assessments with outcomes of the work being expressed through a new metric test object and case studies with real objects carried out by the author. The thesis investigates user requirements for 3D image quality using a series of research methods including semi-structured interviews with comparative testing of real artefacts next to digital representations and psychometric methods for image quality testing adapted from 2D to 3D image assessment. Outcomes of this work provide key information about: viewing habits and current recording tools, motivations for 3D imaging, and digital image criteria required for visual inspection and condition reporting. These are validated through interviews with stakeholders to generate a new set of 3D quality metrics which can be used to plan and assess 3D imaging of artefacts. User requirements highlighted a range of metrics that might be explored numerically including spatial and structural resolution and dimensional recording capabilities of optical surface recording systems. This thesis focusses on form metrology through a purpose designed metric artefact in order to evaluate the performance of state-of-the-art 3D capture technologies. A procedure for close range imaging system characterization has been developed and aimed at use by heritage professionals. The combination of metrics from quantitative comparative sensor testing with findings from qualitative testing have led to a planning tool connecting object properties, sensor metrology capabilities and user requirements. A better understanding has been gained of how technologies produce fit-for-purpose 3D digital records and conclusions are presented in a framework for 3D projects and better 3D recording of cultural heritage artefacts. Examples of the framework are given as case studies carried out by the author.

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