Print Email Facebook Twitter Gloss, color and topography scanning for reproducing a painting’s appearance using 3D printing Title Gloss, color and topography scanning for reproducing a painting’s appearance using 3D printing Author Elkhuizen, W.S. (TU Delft Mechatronic Design) Essers, T.T.W. (TU Delft Technical Support) Song, Y. (TU Delft Mechatronic Design) Geraedts, Jo M.P. (TU Delft Mechatronic Design) Weijkamp, Clemens (Océ Technologies B.V) Dik, J. (TU Delft (OLD) MSE-4) Pont, S.C. (TU Delft Human Information Communication Design) Date 2019 Abstract High fidelity reproductions of paintings provide new opportunities to museums in preserving and providing access to cultural heritage. This paper presents an integrated system which is able to capture and fabricate color, topography and gloss of a painting, of which gloss capturing forms the most important contribution. A 3D imaging system, utilizing stereo imaging combined with fringe projection, is extended to capture spatially-varying gloss, based on the effect of specular reflectance polarization. The gloss is measured by sampling the specular reflection around Brewster’s angle, where these reflections are effectively polarized, and can be separated from the unpolarized, diffuse reflectance. Off-center gloss measurements are calibrated relative to the center measurement. Off-specular gloss measurements, following from local variation of the surfacenormal, are masked based on the height map and corrected. Shadowed regions, caused by the 3D relief, are treated similarly. The area of a single capture is approximately 180x90mm at a resolution of 25x25μm. Aligned color, height, and gloss tiles are stitched together off-line, registering overlapping color regions. The resulting color, height and gloss maps are inputs for the poly-jet 3D printer. Two paintings were reproduced to verify the effectiveness and efficiency of the proposed system. One painting was scanned four times, consecutively rotated by 90 degrees, to evaluate the influence of the scanning system geometric configuration on the gloss measurement. Experimental results show that the method is sufficiently fast for practical application, i.e. to scan a whole painting within eight hours, during closing hours of a museum. The results can well beused for the purpose of physical reproduction and other applications needing first-order estimates of the appearance (e.g. conservation diagnostics and condition reports). Our method to extend appearance scanning with gloss measurements is a valuable addition in the quest for realistic reproductions, in terms of its practical applicability - number of images needed for reconstruction and speed - and its perceptual added value, when added to color and topography reproduction. Subject 3D printing3D scanningGlossMaterial appearancePaintingsReflectance polarization To reference this document use: http://resolver.tudelft.nl/uuid:a42adfd6-8933-43ef-b18b-f33f5ec234eb DOI https://doi.org/10.1145/3317949 Source Journal on Computing and Cultural Heritage, 12 (4) Part of collection Institutional Repository Document type journal article Rights © 2019 W.S. Elkhuizen, T.T.W. Essers, Y. Song, Jo M.P. Geraedts, Clemens Weijkamp, J. Dik, S.C. Pont Files PDF 3317949.pdf 17.54 MB Close viewer /islandora/object/uuid:a42adfd6-8933-43ef-b18b-f33f5ec234eb/datastream/OBJ/view