Abstract
Abstract. The initial focus of this research was on the development of a general workflow for the documentation and monitoring of historical stained glass windows using structured light scanning. Therefore windows from different churches, time periods and with different corrosion and damage phenomena were scanned before and after conservation measures. To evaluate the execution of the restoration measures the data was compared using 3D inspection software to examine the differences in geometry between the two scans. Various problems had to be solved, for example, how to deal with heavily reflective surfaces and the extreme contrast between light and dark surfaces, as seen in the borders between ‘Schwarzlot’ painting and plain glass. The application of materials for matting the surfaces, such as Cyclododecane spray, was impossible due to the high accuracy of the surface measurement required for 3D inspection. Regarding the contrast differences of the surfaces, the creation of exposure fusions and the use of polarization filters to reduce reflections were tested. In addition to the general problems encountered when recording translucent surfaces, the historical glasses caused additional problems in calculating surface comparisons. For example, the windows have to be moved and turned around several times, both during the conservation process and while scanning, causing deformations of the geometry due to the flexible lead rods allowing a certain degree of movement.
Highlights
As part of a research project for the training and qualification of Polish specialists in the restoration of glass paintings, funded by the ‘German Federal Environmental Foundation’ (DBU) and the ‘Deutsch-Polnische Stiftung Kulturpflege und Denkmalschutz’ (DPS) with funds from the Federal Republic of Germany, and in cooperation with the ‘Bundesanstalt für Materialforschung und prüfung’ (BAM) and the KDWT/ University of Bamberg, highresolution 3D documentation was used to evaluate the execution of the restoration measures
Within the research project it was shown that the threedimensional documentation of historical stained glass windows with a commercial structured light scanner is possible
The high-resolution observation of the glass can provide useful information regarding the production of the glass painting and on damage and corrosion phenomena
Summary
As part of a research project for the training and qualification of Polish specialists in the restoration of glass paintings, funded by the ‘German Federal Environmental Foundation’ (DBU) and the ‘Deutsch-Polnische Stiftung Kulturpflege und Denkmalschutz’ (DPS) with funds from the Federal Republic of Germany, and in cooperation with the ‘Bundesanstalt für Materialforschung und prüfung’ (BAM) and the KDWT/ University of Bamberg, highresolution 3D documentation was used to evaluate the execution of the restoration measures For this purpose, historical stained glass windows were recorded using structured light scanning (SLS) before and after the conservation treatment. The windows are from three churches in Poland, and different time periods; the medieval ones are located in Koszewko, the glasses from the early 20th century in Legnica, and the glasses from Oswiecim date back to the mid-20th century.
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