FEC and Multi-layer Video Coding For ATM Networks [chapter]

M. J. Riley, I. E. G. Richardson
1995 Performance Modelling and Evaluation of ATM Networks  
Significant advances have been made in recent years on standards [1][2] [3] for video compression. Compressed video data resulting from these coding standards is however susceptible to quality degradation when cell losses occur during transmission over an ATM network. In [4] [5] we have shown that multi-layer video coding using the Progressive Spectral Selection (PSS) mode of the JPEG algorithm produces parallel traffic streams (or scans) which show different tolerances to cell loss. Therefore,
more » ... we apply varying quantities of FEC to each of the video traffic scans. The scans which are least sensitive to cell loss are transmitted with little or no error correction whereas the highly sensitive DC scan is heavily forward error corrected. A real video sequence is transmitted through a simulated ATM network before reanimation and subjective quality evaluation. We compare the video quality with that resulting from FEC on a baseline JPEG CODEC. We conclude that the quality degradations introduced by cell loss have different effects on the two coding schemes. The base-line JPEG scheme with FEC provides excellent picture quality until the FEC fails where-upon a severely degraded frame results. The PSS JPEG scheme provides much higher FEC protection to the critical scan 0 data but less FEC to the other scans. As the cell error rate increases this will result in a more gradual overall deterioration in picture quality. In some applications the characteristics of the multi-layer scheme may be more desirable.
doi:10.1007/978-0-387-34881-0_23 fatcat:3obx6363qjdktjbsb2q4e4l5ia