Avideh Zakhor

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The Digital Signal Processing Group is carrying out research in the general area of signal processing. In addition to specific projects being carried out on campus, there is close interaction with Lincoln Laboratory, and with the Woods Hole Oceanographic Institution. While a major part of our activities focus on the development of new algorithms, there is a(More)
We propose a full color video compression strategy, based on 3-D subband coding with camera pan compensation, to generate a single embedded bit stream supporting multiple decoder display formats and a wide, finely gradated range of bit rates. An experimental implementation of our algorithm produces a single bit stream, from which suitable subsets are(More)
We present a video compression algorithm which performs well on generic sequences at very low bit rates. This algorithm was the basis for a submission to the November 1995 MPEG-4 subjective tests. The main novelty of the algorithm is a matching-pursuit based motion residual coder. The method uses an inner-product search to decompose motion residual signals(More)
Rate control is an important issue in video streaming applications for both wired and wireless networks. A widely accepted rate control method in wired networks is TCP Friendly Rate control (TFRC) [4]. It is an equation based rate control in which the TCP Friendly rate is determined as a function of packet loss rate, round trip time and packet size. TFRC(More)
With the explosive growth of video applications over the Internet, many approaches have been proposed to stream video effectively over packet switched, best-effort networks. In this paper, we propose a receiverdriven protocol for simultaneous video streaming from multiple senders to a single receiver in order to achieve higher throughput, and to increase(More)
The Video Signature method has been proposed in [1, 2, 3] as a technique to efficiently summarize video for visual similarity measurements. In this paper, we develop the necessary theoretical framework to analyze this method. We define our target video similarity measure based on the fraction of similar clusters shared between two video sequences. This(More)
Packet loss and end-to-end delay limit delay sensitive applications over the best effort packet switched networks such as the Internet. In our previous work, we have shown that substantial reduction in packet loss can be achieved by sending packets at appropriate sending rates to a receiver from multiple senders, using disjoint paths, and by protecting(More)
In this paper we compare techniques for storage and real-time retrieval of variable bit rate (VBR) video da ta for multiple simultaneous users. We compare two main classes of da t a placement techniques: constant t ime length (CTL) and constant data length (CDL). For each technique, we consider both deterministic and statistical admissions control policies(More)