Packet Loss Modeling for Perceptually Optimized 3D Transmission

Abstract

Transmissions over wireless and other unreliable networks can lead to packet loss. An area that has received limited research attention is how to tailor multimedia information taking into account the way packets are lost. We provide a brief overview of our research on designing a 3D perceptual quality metric integrating two important factors, resolution of texture and resolution of mesh, which control transmission bandwidth. We then suggest alternative strategies for packet 3D transmission of both texture and mesh. These strategies are then compared with respect to preserving 3D perceptual quality under packet loss in ad hoc wireless networks. Experiments are conducted to study how the time between consecutive packet transmission and packet size affects loss in wireless channels. A preliminary model for estimating the optimal packet size is then proposed.

Perceptually Optimized 3-D Transmission Over Wireless Networks

“…Also, we do not consider packet size and header length. Some preliminary work by our group incorporating these two parameters will be presented in a conference [24]; however, substantial work still needs to be done to test the influence of these factors over real wireless networks.…”

Non-intrusive Adaptive Multi-media Routing in Peer-to-Peer Multi-party Video Conferencing

“…Another important assumption for our algorithm is that the packet loss rate is linear in UDP multimedia video transfer [35], and the router implements fair queueing for packet handling. In reality, with small perturbation of cross traffic, the packet loss rate is near-linear, but still we can use the linear assumption to infer the upload limit and therefore the number of streams one peer cannot support; we will refer to this as the number of problematic streams for p i , p i ∈ Q.…”

Perceptually Enhanced Multimedia Processing, Visualization and Transmission

“…When multimedia data are transmitted over unreliable networks, the challenge is how to preserve visual quality when a percentage of the data is lost. A 3D Perceptually Optimized Partial Information Transmission (3POPIT) strategy was proposed in [20]. The main idea is to distribute neighboring data in different packets to avoid generating a big void on the mesh (Figure 4) or texture ( Figure 5) surface because of lost data.…”

“…The mathematical model proposed in [38] was later extended to estimate the optimal combination of geometry and texture data given limited bandwidth [20]:…”