Beyond color: in-situ acquisition of monumental ornaments
Résumé
Acquisition of the appearance on monumental ornaments is highly complex, due to their high dimensionality (geometry, lighting and observation directions, but also spatial variations in reflection properties). Although it is possible to obtain accurate, dense data in a controlled environment using calibrated devices, the task is far more complex in-situ. We summarize the main principles of the portable acquisition method developed by Corentin Cou during his Ph.D. [1]. It consists of simultaneously acquiring and reconstructing the object's shape, SVBRDF and normal maps, using two cameras, a light spot and two mirror spheres. We also propose a new method for calibrating photographic projector light sources. Our approach allows great freedom and simplicity in the choice of different light/view pairs. This approach has been validated on large-scale decorative elements for the restoration of Gaston de Saint-Maurice's residence in Cairo.
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