Abstract: Kongsberg Vision Meeting was arranged at Buskerud University College in Kongsberg for the fourth time on December 2, 2011. Rigmor C. Baraas and Gaute T. Einevoll organized the meeting. Keynote speakers were Marianne Fyhn from the University of Oslo (Norway) and Almut Kelber from Lund University (Sweden). The abstracts from the talks are presented in the order they were given.