Digital Signal Processing Reference
In-Depth Information
cally, from which the coder selects the most suitable one from macroblock
to macroblock. MiniDV and DVPro exhibit a very good picture quality at
relatively high data rates and lend themselves easily to postprocessing.
Home editing software for the PC is now available at a cost of around 100
Euros and provides functions available only to professionals a few years
ago. Apart from the actual editing, which is now free of losses and is easy
to handle, the software also allows video material to be coded in MPEG-1,
MPEG-2, VCD, SVCD and video DVD.
Table 10.2. shows the most important technical data of the methods dis-
cussed.
STOP
START
PAUSE
Moving picture
Synthetic
person
Text
Fig. 10.1.
MPEG-4 example
10.2 MPEG3, MPEG4, MPEG7 and MPEG21
In the previous chapters, MPEG-2 and MPEG-1 have been discussed in
detail. However, the Moving Picture Experts Group also considered, and is
still working on, other standards such as MPEG-4, MPEG-7 and MPEG-
21. There was also MPEG-3 but this only had a temporary existence as an
approach to HDTV and has now been completely absorbed into the
MPEG-2 standard. MPEG-4 is a standard for multimedia applications with
interactive components and has been in existence since the end of 1999.
This involves not only video and audio but also applications which can be
composed of a number of different objects. Its structure is object oriented
similar to the programming language C++ and an MPEG-4 application can
thus be composed of, e.g., the following audiovisual objects (Fig. 10.1.):
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