PROF. O. N. ROOD, ON COLOUR–CONTRAST

Prof. Dr. Johannes Joseph van Rood (1926‐2017)

Jon was born on April 7, 1926 in Scheveningen, a town situated on the coast of the Netherlands. At the end of the Second World War, he began his medical studies at Leiden University. After finishing these, Jon was active as a ‘house doctor’, and visited many of his patients in the country areas. He considered this as one of the best medical learning experiences of his early career, as he was co...

Prof. Sir Ravindra N Maini.

P Ravinder Maini was born on 17 th N o v e m b e r 1 9 3 7 i n Lu d h i a n a w h e r e h i s maternal grandparents resided. His paternal g r a n d p a r e n t s h a d migrated to Nairobi , Kenya, at the end of 19th century. His grandfather wa s a b u s i n e s s m a n . Maini’s father, Sir Amar N a t h , h a d q u a l i f i e d as a barrister with a graduate degree from t h e L o n d o n S c h...

Prof. Dr. Prof. Prof.

O N O N N

Hierarchical terrain models describe a topographic surface at di erent levels of detail, providing a multiresolution representation as well as a data compression mechanism. In this paper, we consider the problem of computing the visibility map, with respect to a xed viewpoint, on a hierarchical triangle-based terrain model. This problem presents two aspects: the extraction of a visibility map a...

L L O O N N G

In ancient t imes, wax seals impressed with signet r ings were aff ixed to documents as evidence of their authent ic i ty . A digi ta l counterpart is a message authent icat ion code f ixed f i rmly to each important document. We sketch an archite cture that accompl ishes this by using encapsulat ion of content with provenance metadata, cryptographic seal ing, and webs of t rust rooted in respe...