Multimedia

natureplaygroundAI and Robotics

Nov 14, 2013 (3 years and 10 months ago)

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Multimedia

Brief overview of capabilities and trends

Future perspectives

Basic hardware and software requirements and costs

Brief overview of capabilities and
trends



Multimedia is the presentation of information by a computer
system using

1.
graphics,

2.
animations,

3.
sounds and

4.
text.



The data may be stored in many different ways using computer
storage devices, together with a picture database



The output could be through

1.
Monitors,

2.
sound
-
generators

3.
laser projectors.


Uses of Multimedia

Interactive Video


This involves the user of a computer being linked to a
DVD (large capacity data store) to provide random
access retrieval of images and sound



Access times can sometimes appear long due to the
large amount of data being stored



Disadvantages are forgotten due to the amount,
variety and quality of data which can be retrieved
from one active device.


http://www.youtube.com/profile?feature=iv&annotation
_id=annotation_25646&user=kungfupanda2

Browse


This is a feature of hypertext systems which
allow users to build their own route rather
than following a pre
-
determined one.



The route chosen may be remembered by
the system so that it can be re
-
traced back
to the starting point of that route.




This kind of browsing is particularly useful in
applications such as computerised manuals;
computer aided learning packages and large
databases.


Video Clip


A video clip is a short section of film or
video stored in digital form.



It is easily incorporated in computer
displays.



The video clip would normally be stored
in compressed form; otherwise the
storage cost would be unaffordable.


Video Data Compression


This is the use of electronic methods to reduce the amount
of data that has to be included when video data is stored or
transmitted.



For moving pictures (video), the principles involve identifying
those parts of the picture which change from one scan to
the next, and sending data only about changes (delta
compression).This will save a significant amount of
transmission and storage capacity



Joint Photographic Expert Group (JPEG) had defined
standards for still picture compression, these standards have
been extended by the Motion Picture Expert Group (MPEG)
to cover moving images.



Sound is compressed using MP3 encoding and decoding
mechanisms.

Future perspectives


With advances in technology such as

1.
faster CPUs,

2.
cheaper storage,

3.
very fast Internet connectivity

We now have endless possibilities for
multimedia




Sharing Information


Public databases can be made accessible on
the Internet, allowing a large number of
users to access its contents.




Nowadays, various websites offer free
books to be read from home by accessing
their database. Universities can also publish
their work and research on Internet, which
makes communication and research with
other universities much easier; this is also
further helped by video
-
conferencing which
can encourage distant team
-
work.


Virtual Tours


Thanks to video and sound compression, virtual tours
can be created.



Using a standard interface a user can go on a virtual
tour of a historic or public landmark.



This can be done by taking pictures (or a videos) of
the place, editing it, and finally compiling it, so that the
user can choose where to go by simply clicking the
mouse.



These tours are very popular with real estate
agencies
http://www.360panotour.com/360s/109charlestownhu
nt/foyer.html


Virtual Reality


Thanks to multimedia, virtual reality can also be achieved.



Virtual reality is a computer generated environment which provides the
user with the illusion of being present in that situation. Virtual reality is
produced by providing feedback to our various senses



As the user moves or acts, the image seen will so the same, this requires
high
-
powered computers. There are two main types of virtual reality:

1.
Immersive VR
: these systems provide feedback to as many senses as
possible by using specialised equipment., providing very realistic situations
and are used for training.

2.
Non
-
immersive VR
: this system does not attempting to convince the
user that it is real. This can be done relatively cheaply using common
equipment. The environment is displayed on a standard monitor using 3D
graphics and can be controlled using a simple pointing device such as a
special scalpel that a sculptor may use to carve a sculpture. Other
examples include vehicle driver training.

Basic hardware and software
requirements and costs


The basic requirement for multimedia is a PC which has a:

1.
Video Card
-

to process images

2.
Monitor (CRT or LCD) in order to be able to display multimedia
components,

3.
Sound Card
-

to process sounds

4.
Speakers
-

to playback sounds.

5.
CD or DVD drives
-

to store large amounts of multimedia data.

6.
Colour printer
-

to print images or text on paper.

7.
Input devices.



The type of multimedia dictates the hardware requirements, and
the better the hardware the steeper the costs will be.