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Measuring bidirectional texture reflectance with a kaleidoscope
We describe a new technique for measuring the bidirectional texture function (BTF) of a surface that requires no mechanical movement, can measure surfaces in situ under arbitrary lighting conditions, and can be made small, portable and inexpensive. The enabling innovation is the use of a tapered kaleidoscope, which allows a camera to view the same surface sample simultaneously from many directions. Similarly, the surface can be simultaneously illuminated from many directions, using only a single structured light source. We describe the techniques of construction and measurement, and we show experimental results.
Is Web 2.0 Really Democratic? - Robin Good's Latest News
Web 2.0 has revolutionized the panorama of the information society: users have become information producers and the new web platforms have become relationship venues where new knowledge and ideas emerge. Also the new tools of social networking, social tagging, wikis and blogs enable new forms of social interaction, participation and cooperation. But...
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"Democratizing" means making access (to information, tools, policy-making discussions, elections, etc.) widely available. This, however, does not guarantee a healthy democracy.
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