Modeling and subjective assessment of cell discard in ATM video.
Measurements of subjective picture impairment as a function of network loading in a simulated ATM network are reported. The simulation indicated that cells tend to be discarded in bursts, the frequency and severity of which can be related to the loading by a threshold model. The effect of the discards on broadcast-style video, coded using a single-layer H.261-type method, was found to be a function of scene content and movement at the instant of occurrence. If the visibility of cell discards is maintained at or below threshold in worst-case scenes, the study indicated that network loadings around 55% for a multiplex of 16 video sources and around 70% for a multiplex of 48 video sources are achievable.
Hughes
C J
CJ
Dept. of Electron. Syst. Eng., Essex Univ., Colchester.
Ghanbari
M
M
Pearson
D E
DE
Seferidis
V
V
Xiong
J
J