17 April 1995 Active compression: a framework for video conferencing at very low bit rates
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Videoconferencing is an application of video compression that is rapidly expanding in terms of market acceptance and importance. A number of recent papers discuss methods for very low bit rate videoconferencing between 10 - 20 kbps. In addition, telephone lines with state-of-the- art data modems are capable of transmitting data between 20 - 28 kbps. Since videoconferencing requires the transmission and reception of audio and video, the video component is likely to be restricted to about 20 kbps when using telephone lines. While these recent papers indicate acceptable quality for sequences such as `Miss America' for these very low bit rates, they also indicate higher data rates required for other sequences, that are characterized by excessive movement and/or details. In this paper, we are introducing a framework in which sequences that fall in this category are processed so that they match better the characteristics of the coder. However, this cannot be accomplished without reducing the amount of information in the sequence. The key is to make this in such a way as to produce the least subjectively perceptible distortion. Our experiments have shown that the subjective quality of the resulting sequence after active coding and decoding is better than that of the one resulting from standard coding and decoding.
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Mihai Sipitca, Mihai Sipitca, Timothy J. Klausutis, Timothy J. Klausutis, Vijay K. Madisetti, Vijay K. Madisetti, } "Active compression: a framework for video conferencing at very low bit rates", Proc. SPIE 2419, Digital Video Compression: Algorithms and Technologies 1995, (17 April 1995); doi: 10.1117/12.206397; https://doi.org/10.1117/12.206397

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