Usage parameter control schemes for improving MPEG video quality over ATM networks

Authors:
F. -J. Kuo;J. -S. Wu;D. L. Keng
Affiliations:
Department of Electronic Engineering, National I-Lan Institute of Technology, I-Lan, Taiwan;Department of Electrical Engineering, National Central University, Chung-Li, Taiwan;International Commercial Bank of China, Taiwan
Venue:
Computer Communications
Year:
1999

Citing 6
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Abstract

An MPEG encoder compresses moving pictures into I-, P-, and B-frames, where the most important I-frames generate traffic with the highest bit rate. For MPEG videos transmitted over ATM networks, invalid cells are discarded by a usage parameter control scheme at the user network interface and thus cause error propagation in both spatial and temporal domains. For spatial error propagation, the effect of a lost cell depends on the position located in a slice: the farther the position is, the lesser affected are the data. Besides, lost data near the edge of a screen is more tolerable than those at the central part. In order to improve the quality of the received video, we propose two methods to impute the violation of non-conforming cells to others located at a less important position of the same slice. Simulation results reveal that the quality is improved based on both PSNR and subjective visual feeling.