This book constitutes the refereed proceedings of the 22nd Australasian Joint Conference on Artificial Intelligence, AI 2009, held in Melbourne, Australia, in December 2009. The 68 revised full papers presented were carefully reviewed and selected from 174 submissions. The papers are organized in topical sections on agents; AI applications; computer vision and image processing; data mining and statistical learning; evolutionary computing; game playing; knowledge representation and reasoning; natural language and speech processing; soft computing; and user modelling.Agents.- Experimental Market Mechanism Design for Double Auction.- Model Checking Games for a Fair Branching-Time Temporal Epistemic Logic.- Multistage Fuzzy Decision Making in Bilateral Negotiation with Finite Termination Times.- Simple Default Reasoning in Theories of Action.- From My Agent to Our Agent: Exploring Collective Adaptive Agent via Barnga.- AI Applications.- Classification of EEG for Affect Recognition: An Adaptive Approach.- Effect of Experimental Factors on the Recognition of Affective Mental States through Physiological Measures.- A Distance Measure for Genome Phylogenetic Analysis.- Pattern Prediction in Stock Market.- Balancing Workload in Project Assignment.- Topical Analysis for Identification of Web Communities.- Collaborative-Comparison Learning for Complex Event Detection Using Distributed Hierarchical Graph Neuron (DHGN) Approach in Wireless Sensor Network.- Square Root Unscented Particle Filtering for Grid Mapping.- Computer Vision and Image Processing.- Towards Automatic Image Segmentation Using Optimised Region Growing Technique.- Texture Detection Using Neural Networks Trained on Examples of One Class.- Learning and Recognition of 3D Visual Objects in Real-Time.- Learning Motion Detectors by Genetic Programming.- Information-Theoretic Image Reconstruction and Segmentation from Noisy Projections.- Belief Propagation Implementation Using CUDA on an NVIDIA GTX 280.- Face Image Enlă/