Modeling of the Coding Gain of Joint Coding for Multi-Program Video Transmission

Authors:
André Vincent;Philip Corriveau;Philip Blanchfield;Ron Renaud
Affiliations:
Communications Research Centre Canada, 3701 Carling Avenue, Ottawa, Canada, K2H 8S2;Communications Research Centre Canada, 3701 Carling Avenue, Ottawa, Canada, K2H 8S2;Communications Research Centre Canada, 3701 Carling Avenue, Ottawa, Canada, K2H 8S2;Communications Research Centre Canada, 3701 Carling Avenue, Ottawa, Canada, K2H 8S2
Venue:
Journal of VLSI Signal Processing Systems
Year:
2003

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Abstract

In digital multi-program video transmission, several video programs are compressed (e.g., using MPEG-2), multiplexed, and transmitted over a constant bit rate (CBR) channel. Joint coding, or statistical multiplexing, which is now widely used in digital television broadcasting, dynamically allocates the available channel capacity among programs according to picture content. This scheme is much more efficient than independent coding where each channel is allocated a fixed bit rate. In this paper, we present a model which can relate the decoded picture quality to bit rate, for both independent and joint coding. The model takes into account statistical variations of video program complexity, and incorporates experimental data drawn from formal subjective picture quality assessments. We use the model to calculate the coding gain of joint coding relative to independent coding, in terms of bandwidth savings.