3DMADMAC|SPECTRAL
Integrated System for Surface Measurement of Cultural Heritage Objects
built at Warsaw University of Technology, Faculty of Mechatronics by OGX research group
Project financed by Norwegian Financial Mechanism and EEA Financial Mechanism
grant number PL0097 for period 2004-2009
The aim of the project titled “Digitalization and 3D reconstruction of European cultural heritage objects” was to build an integrated measurement system, capable of automatic measurement of shape coordinates and spectral and angular reflectance characteristics of the surface of artifacts with the use of a single detector. The system uses optical shape measurement method with structured light projection, which results in a cloud of points with shape coordinates. Additionally for every point of the cloud the spectral reflectance is estimated using multispectral acquisition method and angular reflectance is modeled based on reflectometric measurement method. This allows for derivation of color in an independent color space and a faithful simulation of the object’s appearance in different illumination conditions.
Developed data processing methods serve for automatic and objective merging of measurement data from different directions in order to establish coherent model of the measured object. The result of the measurement may be applied in digital storage, conservation and display of cultural heritage objects.
Measurement system parameters:
- operating volume: 300 x 200x 100mm
- shape measurement uncertainty: 10 μm
- spectral reflectance uncertainty (RMS): 1.5%
- color measurement uncertainty (ΔE): 5
- angular reflectance uncertainty: 10%
- number of spectral channels: 10
- method of spectral channels separation: interference filters
- number of directional illuminators: 16
- detector resolution: 4872 x 3248
- projector resolution: 1920 x 1080
Example measurement results (3D models)
Download leaflet (pdf 429KB):
