This book constitutes the refereed proceedings of the International Workshop on Human Computer Interaction, HCI 2007, held in Rio de Janeiro, Brazil, October 20, 2007.

The 16 revised full papers presented were carefully reviewed and selected from 113 submissions. The topics include Affective detection and recognition, Smart interfaces, Human motion tracking, Gesture recognition, Multimedia data modeling and visualization, Multimodal event detection and recognition, Human motion and gesture recognition, HCI issues in image/video retrieval, Learning in HCI, Input and interaction techniques, Perceptual user interfaces, Wearable and pervasive technologies in HCI and Intelligent Virtual Environments.

It was our great pleasure to host the 4th International Conference on Image and Video Retrieval (CIVR) at the National University of Singapore on 20 22 July 2005. CIVR aims to provide an international forum for the discussion of research challenges and exchange of ideas among researchers and practitioners in image/video retrieval technologies. It addresses innovative research in the broad ?eld of image and video retrieval. A unique feature of this conference is the high level of participation by researchers from both academia and industry. Another unique feature of CIVR this year was in its format it o?ered both the traditional oral presentation sessions, as well as the short presentation cum poster sessions. The latter provided an informal alternative forum for animated discussions and exchanges of ideas among the participants. We are pleased to note that interest in CIVR has grown over the years. The number of submissions has steadily increased from 82 in 2002, to 119 in 2003, and 125 in 2004. This year, we received 128 submissions from the international communities: with81(63.3%)fromAsiaandAustralia,25(19.5%)fromEurope, and 22 (17.2%) from North America. After a rigorous review process, 20 papers were accepted for oral presentations, and 42 papers were accepted for poster presentations. In addition to the accepted submitted papers, the program also included 4 invited papers, 1 keynote industrial paper, and 4 invited industrial papers. Altogether, we o?ered a diverse and interesting program, addressing the current interests and future trends in this area."

Welcome to the 2nd International Conference on Image and Video Retrieval, CIVR2003. The goal of CIVR is to illuminate the state of the art in visual information retrieval and to stimulate collaboration between researchers and practitioners. This year we received 110 submissions from 26 countries. Based upon the reviews of at least 3 members of the program committee, 43 papers were accepted for the research track of the conference. First, we would like to thank all of the members of the Program Committee and the additional referees listed below. Their reviews of the submissions played a pivotal role in the quality of the conference. Moreover, we are grateful to Nicu Sebe and Xiang Zhou for helping to organize the review process; Shih-Fu Chang and Alberto del Bimbo for setting up the practitioner track; and Erwin Bakker for editing the proceedings and designing the conference poster. Special thanks go to our keynote and plenary speakers, Nevenka Dimitrova fromPhilipsResearch, RameshJainfromGeorgiaTech, ChrisPorterfromGetty Images, andAlanSmeatonfromDublinCityUniversity.Furthermore, wewishto acknowledge our sponsors, the Beckman Institute at the University of Illinois at Urbana-Champaign, TsingHuaUniversity, theInstitutionofElectricalEngineers (IEE), PhilipsResearch, andtheLeidenInstituteofAdvancedComputerScience at Leiden University. Finally, we would like to express our thanks to severalpeople who performed important work related to the organization of the conference: Jennifer Quirk and Catherine Zech for the localorganizationat the BeckmanInstitute; Richard Harvey for his help with promotional activity and sponsorship for CIVR2003; andtotheorganizingcommitteeofthe?rstCIVRforsettinguptheinternational mission and structure of the co