Table 1.
Summary of important symbols used.
| Symbol | Definition |
|---|---|
| m | Slice index |
| r | ROI index |
| f | Frame index |
| L f,r,m | Length of slice m in ROI r, frame f |
| L | Average slice length |
| L max | Max slice length |
| r tot | Number of ROIs |
| f tot | Number of frames per GOP |
| I f,r | Number of slices in ROI r in frame f |
| N f,r | Number of pixels in ROI r in frame f |
| μ f,r,m | Quantization parameter(s) for slice m, ROI r, frame f |
| π f,r,m | Service class |
| p E | Generic probability of packet loss |
| p L | Residual probability of packet loss after RS coding |
| ρ(π f,r,m) | Probability of packet loss for service class π r,m |
| L B | Generic mean error burst length (in packets) |
| q | Transition prob. lossy → lossless (Gilbert model) |
| p | Transition prob. lossless → lossy (Gilbert model) |
| ℒ(π f,r,m) | Mean error burst length for service class π r,m |
| B f,r,m | Encoding bits for slice m in ROI r, frame f |
| c | RS symbol size |
| N | RS code block length (in q-ary symbols) |
| K | RS data block size (in q-ary symbols) |
| R C = K/N | RS code rate |
| R C(π r,m) | RS code rate for service class π r,m |
| R(π r,m) | Transmission rate for service class π r,m |
| T f,tot | Transmission time per frame |
| x i | Luminance of pixel i in original frame |
| y i | Luminance of pixel i in received frame |