Tag-based information retrieval for educational videos

Due to a steadily growing amount of media content – including collections of movies, music, archived TV programmes as well as websites’ content – metadata that enable users to find what they need become more and more urgent. The problem of annotation, i.e., adding metadata to content, increases likewise. Firstly, because an increasing amount of resources needs to be spent on annotation, as argued by Mathes [1]. Secondly, the quality of the metadata becomes more and more critical: a growing collection requires good indexing of the content to enable effective content retrieval. The question then is to which extent existing forms of metadata suffice to guarantee an easy retrieval of information on the one hand and to keep the costs of adding metadata to resources under control on the other hand.