Guest Editors' Introduction: Special Section on ISIP 2011

This special section comprises of nine selected papers from the fourth International Symposium on Intelligent Information Technology and Security Informatics (ISIP 2011). The conference received 310 paper submissions from 11 countries and regions, of which 157 papers were selected for presentation after a rigorous review process. From these 157 research papers, through two rounds of reviewing, the guest editors selected nine as the best papers on the Multimedia track of the Conference. The candidates of the Special Issue are all the authors, whose papers have been accepted and presented at the ISIP 2011, with the contents not been published elsewhere before. The ISIP 2011 was co-sponsored by Henan Polytechnic University, China; Peoples' Friendship University of Russia, Russia; Feng Chia University, Taiwan; Jiangxi University of Science and Technology, China;Fudan University, China; South China University of Technology, China; Nanchang Hang Kong University, China; Jiaxing University, China; Academy Publisher of Finland, Finland and took place on August 19-22, 2011, in Jiaozuo, China. “Speech Separation in the Vehicle Environment Based on FastICA Algorithm”, by Jindong Zhang, Guihe Qin and Ye Liu. In this paper, the FastICA algorithm in signal process and statistics was studied and used to separate the driver’s speech in the vehicle environment, and realizes the pretreatment in recognizing driver’s speech. “Semantic Analysis of Traffic Video Using Image Understanding”, by Jian Wu, Zhi-ming Cui, Heng-jun Yue, and Guang-ming Zhang. This paper introduces the methods of image understanding and proposes a video semantic analysis framework using scene analysis for recognizing some semantic events in the traffic video. “Research on Video Quality Assessment”, by Chunting Yang, Yang Liu and Jing Yu. In this paper, research has been focused on developing novel objective evaluation metrics which enable prediction of the perceived quality level. The temporal correlations of video frames and the visual interest feature are considered in this method. Meanwhile the metrics are capable of capturing spatial distortions in video sequences. “Tele-Immersive Interaction with Intelligent Virtual Agents Based on Real-Time 3D Modeling”, by Shujun Zhang and Wan Ching Ho. In this paper author explored the combination of real-time 3D modelling and HAI and proposed a prototype of mixed reality system for tele-immersion. Image-based real-time 3D modeling techniques offer essential ways to support tele-immersion and natural HAI. “The Research of Image Encryption Algorithm Based on Chao