Does anybody actually use the scalability modes?
A. At this time, scalability has found itself a limited number of applications, although research is definitely underway for its use in HDTV. Experiments have been demonstrated in Europe where, for example, PAL-rate video (720 x 576 x 25 fps) is embedded in the same stream as HDTV rate video (1440 x 1152 x 25 fps). The Nov. 1992 VADIS experiment divided the base layer (PAL) and enhancement into 4 and 16 Mbit/sec channels, respectively. The U.S. Grand Alliance favors HDTV simulcasting (separate NTSC analog and digital HDTV broadcasts). Temporal scalability is the pet scalability mode as the possible future solution for coding 60 Hz progressive sequences while maintaining backwards compatibility with early-wave equipment (e.g. 1920 x 1080 x 30 Hz displays) . To elaborate, the first wave receivers of the late 1990’s would be limited to 62at 0 Hz interlaced/30 Hz progressive HDTV decoders. Essentially, 60 interlaced fields would be coded in a, for example, 16 Mbit/sec stream in 1996, and w
Related Questions
- Other scalability modes were experimented with in MPEG-2 video (such as Frequency Scalability), but were eventually dropped in favor of methods that demonstrated similar quality and greater simplicity. What is the TM rate control and adaptive quantization technique ?
- actually sent per line in 320 and 640 modes on the GS?
- Does anybody actually use the scalability modes?
