19 January 2009 Development of practical investigation system for cultural properties based on a projector-camera system
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Huge number of historical materials and cultural properties in museums are investigated based on scientific and chemical analysis techniques, however these techniques require specific equipments with difficult operations. In this research, a practical investigation system is developed to provide convenient way for investigating color information in variety of materials as the first step of the investigation process. The system consists of a data projector and a digital camera, and the system is examined to detect metameric color area as an example of investigation purposes. In this research, the data projector has a role of illuminator to yield illuminant metamerism, and the camera takes sequential images under different illumination colors created by the projector. In the experiment, seven colors of illumination are created by the projector, then images are taken under each colored illumination. The Euclid distance in the RGB space between a predetermined reference pixel and test pixels is calculated in each of taken images. These distances are compared with thresholds determined by using a metamerism test chart. The proposed system was examined for the test charts and Japanese authentic wooden prints, and the experimental results showed that the system could offer convenience as the first investigation of the materials.
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Kimiyoshi Miyata, Kimiyoshi Miyata, } "Development of practical investigation system for cultural properties based on a projector-camera system", Proc. SPIE 7241, Color Imaging XIV: Displaying, Processing, Hardcopy, and Applications, 724104 (19 January 2009); doi: 10.1117/12.805770; https://doi.org/10.1117/12.805770

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