The SITIS conference is dedicated to research on the technologies used to represent, share and process information in various forms, ranging from signal, image, and multimedia data to traditional structured data and semi-structured data found in the web. SITIS spans two inter-related research domains that increasingly play a key role in connecting systems across network centric environments to allow distributed computing and information sharing. SITIS 2013 aims to provide a forum for high quality presentations on research activities centered on three main tracks: The first track titled " Web Computing and Applications (WeCA)" focuses on emerging and novel concepts, architectures and methodologies for information management. The Internet and the related technologies have created an interconnected world in which information can be exchanged easily, tasks can be processed collaboratively, communities of users with similarly interests can be formed to achieve efficiency and improve performance. The second track titled "Signal & Image Technologies" (SIT) focuses on recent developments in digital signal processing and pays particular attention to evolutions in audiovisual signal processing, analysis, coding and authentication, and retrieval techniques. The focus of the third track titled "Multimedia Information Retrieval and Application (MIRA)” is on emerging modeling, representation and retrieval techniques that take into account the amount, type and diversity of multimedia information accessible in distributed computing environment. The internet, social networking, multimedia databases and management of multimedia cultural collections have created the need for cross-fields models, paradigms and techniques for efficient modeling, management and consumption of multimedia contents. The track calls for research papers and reports directed at several areas including Multimedia Query and Retrieval; Mobile and Location-Based Media, Social media and Social networking, Multimedia Security, and Multimedia Arts, Entertainment and Digital Culture. SITIS is also dedicated to bring together scientists from the world over, particularly from developing countries, to share and exchange knowledge, experience and research results. When the conference is hosted by research institutions in developing countries, a particular emphasis will be placed on the presentation of applied research, the organization of practical tutorials and workshops that may help address the information processing needs of these countries, and book give away sessions to allow conference attendees to donate books to the local institutions.