The duration of the project in year 2011 was six months. Therefore we refer to a article, published in that time-frame, which is not a direct result of a project, but is nevertheless relevant for the project. The article describes generic methodology for efficient distribution of features in visual sensor networks (e.g. a network of intelligent cameras), with special emphasis on the hierarchical structure of the features. The transmission of such hierarchically constructed features significantly decreases communication burden on the network, while retaining the performance of the non-hierarchically structured features.