A system for simultaneously measuring surface normal vectors and BTF (bidirectional texture function) profiles of an object is proposed. This system consists of a correlation camera and a spherical scanning light source. The system can compress BTF measurement in one dimension of incidence direction to a single image frame, as well as measure a profile of the BTF under the scanning light source just from a single image frame. Experimental results on an implemented system demonstrate the feasibility of the proposed system.
Akira Kimachi, Motonori Doi, Shogo Nishi, "A Normal Vector and BTF Profile Measurement System Using a Correlation Camera and Scanning Dome Illumination" in Proc. IS&T Int’l. Symp. on Electronic Imaging: Material Appearance, 2017, pp 13 - 18, https://doi.org/10.2352/ISSN.2470-1173.2017.8.MAAP-274