Sensitivity of model-based coded video to packet losses
Previous model-based video coding studies have focused on the modelling techniques themselves and have not considered the transportation of an implementable coder over lossy networks. In this article a hybrid switched 3D model-based/H.261 video coder designed for one-to-many distance learning applications over the Internet multicast backbone (MBONE) is employed to study the susceptibility to data loss of model based packet video. Data is considered as; texture, motion and shape, with further sub-division to periodic and aperiodic types. The absence of the various data streams in isolation is investigated to reveal the types of degradation possible and then statistical loss is applied to all streams simultaneously to observe the combined effects using a simple loss model. The ability of the various streams to recover from these errors is investigated and an order of priority for the data types is then identified.