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The purpose of this paper is to analyze the relationship between viewer-perceived quality and encoding schemes. The encoding schemes depend on transmission bit-rate, on MPEG compression depth, on frame size and on frame rate in a constant bit-rate (CBR) video transmission of a MPEG2 video sequence. The compressed video sequence is transmitted over a lossy(More)
—We analyze viewer-perceived quality of a compressed video stream, transmitted over a lossy IP network with a quality of service mechanism. The parameters of the encoding schemes include the transmission bit rate, the compression depth, the frame size and the frame rate. We demonstrate that when jointly considering the impact of the coding bit rate, the(More)
Transmission of a compressed video signal over a lossy communication network exposes the information to losses and errors, which leads to significant visible errors in the reconstructed frames at the decoder side. In this paper we present a new hybrid error concealment algorithm for compressed video sequences, based on temporal and spatial concealment(More)
One result of the recent advances in different components of imaging systems technology is that these systems have become more resolution-limited and less noise-limited. The most useful tool utilized in characterization of resolution-limited systems is the modulation transfer function (MTF). Our goal is to use the MTF as an image quality measure of image(More)
Transmission of a compressed video signal over a lossy communication network exposes the information to losses and errors, which may cause serious and visible degradation to the decoded video stream. We present a new hybrid error concealment algorithm, relying on temporal and spatial concealment. This algorithm includes consideration of the spatial and(More)
This work presents a complete error concealment system, for overcoming visible distortions in video sequences which are transmitted over a lossy communication network. The system we propose provides an error concealment solution from the point of receiving the transmitted sequence by the decoder, until it is presented to viewers, without human interference.(More)
In this paper we analyze the viewer-perceived quality of a compressed video stream, which is transmitted over a lossy IP network with QoS (quality of service) mechanism. We demonstrate that when jointly considering the impact of coding bit rate, packet loss ratio and video characteristics, there is an optimal encoding scheme, which maximizes the(More)
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