This book constitutes the thoroughly refereed post-proceedings of the First International CLEAR 2006 Evaluation Campaign and Workshop on Classification of Events, Activities and Relationships for evaluation of multimodal technologies for the perception of humans, their activities and interactions. The workshop was held in the UK in April 2006. The papers were carefully reviewed and selected for inclusion in the book.

Table of Contents:
Overview.- The CLEAR 2006 Evaluation.- 3D Person Tracking.- 3D Audiovisual Person Tracking Using Kalman Filtering and Information Theory.- A Generative Approach to Audio-Visual Person Tracking.- An Audio-Visual Particle Filter for Speaker Tracking on the CLEAR’06 Evaluation Dataset.- Multi-and Single View Multiperson Tracking for Smart Room Environments.- UPC Audio, Video and Multimodal Person Tracking Systems in the Clear Evaluation Campaign.- A Joint System for Single-Person 2D-Face and 3D-Head Tracking in CHIL Seminars.- Speaker Tracking in Seminars by Human Body Detection.- TUT Acoustic Source Tracking System 2006.- Tracking Multiple Speakers with Probabilistic Data Association Filters.- 2D Face Detection and Tracking.- 2D Person Tracking Using Kalman Filtering and Adaptive Background Learning in a Feedback Loop.- PittPatt Face Detection and Tracking for the CLEAR 2006 Evaluation.- Person Tracking on Surveillance Data.- The AIT Outdoors Tracking System for Pedestrians and Vehicles.- Evaluation of USC Human Tracking System for Surveillance Videos.- Vehicle Tracking.- Multi-feature Graph-Based Object Tracking.- Multiple Vehicle Tracking in Surveillance Videos.- Robust Appearance Modeling for Pedestrian and Vehicle Tracking.- Robust Vehicle Blob Tracking with Split/Merge Handling.- Person Identification.- A Decision Fusion System Across Time and Classifiers for Audio-Visual Person Identification.- The CLEAR’06 LIMSI Acoustic Speaker Identification System for CHIL Seminars.- Person Identification Based on Multichannel and Multimodality Fusion.- ISL Person Identification Systems in the CLEAR Evaluations.- Audio, Video and Multimodal Person Identification in a Smart Room.- Head Pose Estimation.- Head Pose Estimation on Low Resolution Images.- Evaluation of Head PoseEstimation for Studio Data.- Neural Network-Based Head Pose Estimation and Multi-view Fusion.- Head Pose Estimation in Seminar Room Using Multi View Face Detectors.- Head Pose Detection Based on Fusion of Multiple Viewpoint Information.- Acoustic Scene Analysis.- CLEAR Evaluation of Acoustic Event Detection and Classification Systems.- The CLEAR 2006 CMU Acoustic Environment Classification System.- Other Evaluations.- 2D Multi-person Tracking: A Comparative Study in AMI Meetings.- Head Pose Tracking and Focus of Attention Recognition Algorithms in Meeting Rooms.