T. M. Liu

Publications (3)0 Total impact

• Conference Proceeding: A novel video key frame extraction algorithm

  T.M. Liu, H.J. Zhang, F.H. Qi
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  ABSTRACT: Key frame is a simple yet effective form of summarizing a long video sequence. We present a novel key frame extraction algorithm. The number of and where to place the key frames are determined by the Perceived Motion Energy (PME) feature of a shot. The motion pattern of a typical scene is composed of a motion acceleration process and a following deceleration process and this pattern is repeated in video sequence. A triangle model is developed to describe the motion pattern and segment video sequences. The frames at the start point and end point of motion acceleration are selected as key frame candidates. So one can infer the movement in between two key frames and the salient action content in video can be abstracted by these key frames.
  Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on; 02/2002
• Source

  Available from: psu.edu

  Article: A Content-Aware Rate Controller For Streamed Delivery Of Mpeg-4 Fgs Video

  T. M. Liu, W. Qi, H. J. Zhang, F. H. Qi
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  ABSTRACT: A content-aware rate controller (CRC) for MPEG-4 FGS stored video streaming over the Internet is proposed. The CRC optimally uses available bandwidth and client buffer to produce smooth video quality and provide protection to video segments with important content. The FGS video stream is forward-shifted to client buffer by actively dropping high enhancement layers. When bandwidth decreases sharply, the FS buffer is used as bandwidth so that the sharp bandwidth drop is hidden from the decoder. The active dropping and forward-shifting process is restarted when bandwidth recovers. Thus, higher layers of less importance content are dropped and lower layers of more importance are protected. A priori information about the stream content is used in the CRC such that video segments with important content are protected by allocating them more bandwidth.
  06/2001;
• Source

  Available from: psu.edu

  Article: A Systematic Rate Controller For Mpeg-4 Fgs Video Streaming

  T. M. Liu, W. Qi, H. J. Zhang, F. H. Qi
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  ABSTRACT: This paper proposes a systematic rate controller (SRC) for streamed delivery of MPEG-4 FGS video over the Internet. It provides both coarse-grain and fine-grain scalability of rate adaptation to various user access rates, long-term or short-term bandwidth fluctuations, and bit-rate variations of streamed video in a general scope of time-scale. A state machine (SM) is developed to implement the SRC. The adaptation is realized through mode and state transitions of the SM.
  05/2001;