Video technology from Dallmeier has guaranteed security at the National Portrait Gallery in London for many years, and now the system has been modernised and expanded.

Founded in 1856, the aim of the National Portrait Gallery in London is "to promote through the medium of portraits the appreciation and understanding of the men and women who have made and are making British history and culture, as well as the understanding of portraiture in all media".

The Gallery holds the most extensive collection of portraits in the world. The collection is displayed in London and in a number of locations around the United Kingdom, including several houses managed by the National Trust. Like other national museums, the Gallery is supported both by government and increasingly by a large number of individuals, companies and foundations, as well as by the receipts from shops, events and ticketed exhibitions.

One of the most successful events in the history of the gallery was held last year, in honour of Lucian Freud (1922-2011). The Lucian Freud Portraits exhibition consisted of 130 portraits painted by the great man, borrowed from museums and private collections all over the world. Over three months, it attracted a record 248,000 visitors. But before the exhibition could be opened to such acclaim, the existing video system had to be expanded and modernised.