Fully Automatic Saliency-based Subjects Extraction in Digital Images Topics: Multimedia Authoring, Editing and Sharing; Multimedia Databases, Indexing, Recognition and Retrieval In Proceedings of the 10th International Conference on Signal Processing and Multimedia Applications and 10th International Conference on Wireless Information Networks and Systems - Volume 0ICETE, 129-136, 2013 , Reykjavík, Iceland