报告时间：星期六（2015.12.26）10:00 am
报告地点：电子信息楼441
报告人：Feng Pan, Ienso Inc., Richmond Hill, Canada
内容简介：This talk will give a brief introduction of digital video compression, its techniques, standards, and current development. It will then focus on the various aspects of video quality, including its characteristics, its measurement and improvements. Particular attention has been paid to rate control techniques, which is the main factor that determines the overall video quality at given bitrate. Traditionally, the purpose of a rate control scheme is to maintain the buffer occupancy at certain level by slowly regulating the quantization parameters (QP) of a frame. Slow adjustment of QP could not response to sudden changes of scene complexity, resulting in bits being wasted at complex area, and poor perceptual quality at flat area. The drastic variation of bits could also increase the risk of Buffer underflow/overflow.
At the end of this talk, other important tools that help to improve video quality have also been introduced. These include look-ahead scene change detection, adaptive Group of Picture (GOP) size, adaptive de-blocking filter, adaptive weighted quantization, skin tone detection, night scene detection, one-field picture coding etc. All those tools have been implemented in the current XCODE video transcoder and have significantly improve the video quality, especially at low bit rate.
个人介绍：Feng Pan received the B.Sc., M.Sc., and Ph.D. degrees in communication and electronic engineering from Zhejiang University, China, in 1983, 1986, and 1989, respectively.
Since then, he has been teaching and researching in a number of universities in China, U.K., Ireland, and Singapore. His research areas are digital image processing, digital image/video compression, digital television broadcasting, and pattern recognition. He has published more than 70 technical papers, over 10 IP disclosures, and many contributions to international standard organization in the above area, and conducted many short courses for companies. Dr. Pan has been serving as the member of organizing committee for a number of international conferences. He was the Chapter Chairman of IEEE Consumer Electronics, Singapore, from 2002 to 2004.
Dr. Pan is currently a Video System Designer at Ienso Inc., Canada, working in the area of image and video signal processing and camera image quality improvement. Before that he had been serving as Video Architect and Manager of Video Quality Lab in ViXS Systems Inc. Prior to that he was the senior scientist, lab head and Assistant Division Director at Institute for Infocomm research in Singapore.