The four volume set LNAI 3681, LNAI 3682, LNAI 3683, and LNAI 3684 constitute the refereed proceedings of the 9th International Conference on Knowledge-Based Intelligent Information and Engineering Systems, KES 2005, held in Melbourne, Australia in September 2005.

The 716 revised papers presented were carefully reviewed and selected from nearly 1400 submissions. The papers present a wealth of original research results from the field of intelligent information processing in the broadest sense.

The third volume is organized in topical sections on intelligent agent ontologies and environments, intelligent multimedia solutions and the security in the next generation mobile networks, intelligent email analysis, news extraction and web mining, semantic integration and ontologies, computer vision, image processing and retrieval, communicative intelligence, approaches and methods to security engineering, multimedia retrieval, multimedia compression, multimedia signal processing, emergence and self-organisation in complex systems, soft computing techniques and their applications, information engineering and ubiquitous computing, location and context-based systems, e-based systems in education, commerce and health, computational biology and bioinformatics, complex adaptive systems, speech processing and robotics, data mining and soft computing applications, multimedia security and stegnography, stegnography, soft computing approach to industrial engineering, medical text mining and natural language processing, knowledge based intelligent systems for health care, intelligent learning environment, and intelligent data analysis and applications.