Intze Overhead Water Tank Design by Working Stress - IS Method.pdf
Unit 4 and 5
1. Fundamentals of Multimedia, Chapter 3
UNIT- IV
• FILE FORMATS
•INPUT & OUTPUT DEVICES
• STORAGE TECHNIQUES
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2. Fundamentals of Multimedia, Chapter 3
File Formats
Different applications (programs) store data in different
formats. Applications support some file formats and not
others.
File formats appear as a (usually) 3 letter suffix or
“extension” after the name of the file, e.g., .psd, .doc,
.jpg, .pct, .tif, .gif, .ppt, etc.
3. Fundamentals of Multimedia, Chapter 3
GIF
• GIF standard (Graphics Interchange Format):
Limited to 8-bit (256) color images only, which, while
producing acceptable color images, is best suited for
images with few distinctive colors .
• GIF standard supports interlacing — successive
display of pixels in widely-spaced rows by a 4-pass
display process.
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5. Fundamentals of Multimedia, Chapter 3
GIF
• For the standard specification, the general file format of a GIF file is as
in following fig.
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6. Fundamentals of Multimedia, Chapter 3
JPEG
• JPEG (Joint Photographic Experts Group): The most important
current standard for image compression (.jpg, .jpeg, .jpe).
• The human vision system has some specific limitations and JPEG
takes advantage of these to achieve high rates of compression.
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7. Fundamentals of Multimedia, Chapter 3
A photo of a flower compressed with successively more lossy
compression ratios from left to right.
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9. Fundamentals of Multimedia, Chapter 3
PNG
• PNG format: standing for Portable Network Graphics — meant to
supersede the GIF standard, and extends it in important ways.
• Special features of PNG files include:
1. Support for up to 48 bits of color information — a large increase.
2. Files may contain gamma-correction information for correct display
of color images, as well as alpha-channel information for such uses as
control of transparency.
3. The display progressively displays pixels in a 2-dimensional fashion
by showing a few pixels at a time over seven passes through each 8
8 block of an image.
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10. Fundamentals of Multimedia, Chapter 3
TIFF
• TIFF: stands for Tagged Image File Format.
• The support for attachment of additional information (referred to as
“tags”) provides a great deal of flexibility.
1. The most important tag is a format signifier: what type of
compression etc. is in use in the stored image.
2. TIFF can store many different types of image: 1-bit, grayscale, 8-
bit color, 24-bit RGB, etc.
3. TIFF was originally a lossless format but now a new JPEG tag allows
one to opt for JPEG compression.
4. The TIFF format was developed by the Aldus Corporation in the
1980's and was later supported by Microsoft.
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12. Fundamentals of Multimedia, Chapter 3
I/O Devices: Input
• An input device one that, together with appropriate
software, transforms iinnffoorrmmaattiioonn from the user into ddaattaa
that the computer application can process.
• Choice and method of use of an input device should
contribute positively to uussaabbiilliittyy of the system
• The usability of an input device depends greatly on the
provision of appropriate ffeeeeddbbaacckk
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13. Fundamentals of Multimedia, Chapter 3
Pointing devices: cursor control
• 33DD ttrraacckkeerr
– Relays position and orientation to a receiver. Replaces mouse where
desk space is limited (e.g., laptops)
• JJooyyssttiicckk
– Small stick, movable in any direction in a fixed socket.
• MMoouussee
– continuous input device. Buttons for discrete input. Relative device.
• TTrraacckkbbaallll (a.k.a. “dead mouse”)
– Rotatable ball in fixed socket
• TTaabblleett
– used with stylus or puck. Absolute device
• MMoollee (a.k.a. “foot mouse”)
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14. Fundamentals of Multimedia, Chapter 3
• DDaattaagglloovvee
– Communicates hand and finger position to an application. Used
for manipulating virtual objects
• TToouucchh--sseennssiittiivvee ssccrreeeenn
– Special screen that detects the position of a finger touching it.
• LLiigghhtt ppeenn
– Location found by beam passing through screen during refresh
cycle
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15. Fundamentals of Multimedia, Chapter 3
Choosing appropriate input devices
• Matching devices with wwoorrkk
– The particular manipulations needed to accomplish a piece of work need
to be analyzed
– Natural mappings between use, feedback, meaning of result and user’s
mental model are needed
• Matching devices with uusseerrss
– e.g., eye and head input for the physically disabled
• Matching devices with eennvviirroonnmmeenntt ooff uussee
– space
– relation to other concurrent tasks etc.,
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16. Fundamentals of Multimedia, Chapter 3
Types of Storage
• Magnetic Disk Storage
• Optical Disks
– Magneto-optical
– CD-ROM
– CD-R
– CD-RW
– DVD-ROM
• Magnetic Tape Storage
17. Fundamentals of Multimedia, Chapter 3
Magnetic Disk Storage
• Data represented as magnetic spots
– Magnetized spot = 1
– Absence of a magnetized spot = 0
• Read
– Converts the magnetized data to electrical
impulses
• Write
– Converts electrical impulses to magnetized spots
on disk
18. Fundamentals of Multimedia, Chapter 3
High-Capacity Portable Disks
• Larger files
• Portable
• High-capacity
– 120 / 200 MB
– Can read and write standard diskettes
– Ex: Superdisk
• Zip disk
– 250 MB
– not compatible with 3 ½ inch diskettes
19. Fundamentals of Multimedia, Chapter 3
Hard Disk
• Various sizes
• Portability
– Generally non-portable
– Removable hard disks available for PC
• Rigid platter coated with metallic
substance
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Disk Drive
Read / Write Operation
• Disks rotate
• Access arm moves read/write
head
• Read / write operation
begins and continues until
complete
• Data is transferred to/from
memory
22. Fundamentals of Multimedia, Chapter 3
Optical Disk
• Greater capacity than other portable media
• Process
– Laser writes on metallic material spread over the
surface of disk
– Heat from laser produces pits on disk surface
– Reading – laser picks up light reflections from the pits
• Technology
– ROM
– WORM
23. Fundamentals of Multimedia, Chapter 3
MO
Magneto-optical
• Hybrid
• High-volume capacity
• Written multiple times
• Process
– Laser melts a microscopic spot
– Magnet aligns crystals
– Reading – laser picks up light reflection from crystals
24. Fundamentals of Multimedia, Chapter 3
CD-ROM
Compact Disk Read-Only Memory
• High capacity portable
• Read multiple times
• Cannot record
• Capacity – up to 680 MB (450
standard 3 ½ inch diskettes)
• Used for software distribution
25. Fundamentals of Multimedia, Chapter 3
CD-R
Compact Disc-Recordable
• High capacity
• Portable
• Write once
• Read multiple times
– CD-R drive
– CD-ROM drive
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CR-RW
Compact Disk-Rewritable
• High capacity
• Portable
• Read multiple times
• Record multiple times
• Some compatibility problems reading CD-RW
disks on CD-ROM drives
27. Fundamentals of Multimedia, Chapter 3
DVD-ROM
Digital Versatile Disk
• Larger capacity than CD-ROM
– Standard – Up to 4.7 GB, 7 times more than CD-ROM
– Double layers – 8.5 GB
– Double-sided – 17 GB
• Data is packed more densely
• Read multiple times, Cannot record
• Can read CD-ROM disks
28. Fundamentals of Multimedia, Chapter 3
Digital Versatile Disk
• Benefits
DVD-ROM
– Full-length movies
– Audio quality comparable to audio compact disks
– High-volume business data
• Expected to replace CD-ROM in the near
future
30. Multimedia Authoring Tools
• Multimedia authoring tools provide the
important framework that Multimedia
designers require to organises and edit the
various elements of a multimedia projects
including, Video, Sound, Animation, Graphics
and Text.
• Authoring tools are used for designing
interactivity and User Interface.
31. Multimedia Authoring Tools II
• There are three general categories
of Multimedia authoring tools.
• These are:
– Card or page-based tools
– Icon-based tools
– Time-based tools
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32. Multimedia Authoring Tools III
• Card - or Paged based tools
– Are systems that are based on a book
or a page metaphor. This means that
the way the elements are organized are
similar to pages of a book or a card
file.
– E.g. Hypercard
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33. Multimedia Authoring Tools III
• Card - or Paged based tools
– Are systems that are based on a
book or a page metaphor. This
means that the way the elements are
organized are similar to pages of a
book or a card file.
– E.g. Hypercard
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34. Multimedia Authoring Tools IV
• Icon-Based Tools
– These authoring tools multimedia
elements are organised as objects
in a structural framework. The
programme typically displays
flow diagram of activities along
branching paths
– E.g Macromedia Authorware
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35. Multimedia Authoring Tools V
• Time-Based Tools
– These authoring systems view the
development of a multimedia
package as organising objects along
a time line. Sequentially organised
frames are then played back to the
user.
– E.g Macromedia Director
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37. Hypertext
• Hypertext is a system of storing images,
text, and other computer files that allows
direct links to related text, images, sound,
and other data.
• Hypertext is the main basis of operation for
the web.
38. Hypermedia
• Hypermedia is an updated extension of text
in hypertext.
• It is the connection between hypertext and
multimedia.
• Hypermedia documents contain links to
other pieces of text, sound, images, movies,
and other forms of media.
39. How Hypertext is Different From
Hypermedia
• Like regular text, hypertext can be edited,
stored, searched or read. Unlike regular
text, it can also contain connections to other
documents.
• Hypermedia documents are like hypertext,
except that they also contain links to other
forms of media like movies, sound, and
images.
40. Uses of Hypermedia/Hypertext
• As an educational tool
• As a way of navigating the internet.
• A way of organizing content in a database.
• As a way of allowing users with disabilities to learn.
• Entertainment.
• Making online purchases.
• Not just for the internet. Can be used in other applications
such as dictionaries, encyclopedias, databases, and
presentations.
41. Distributed Multimedia
What is Distributed Multimedia?
Large quantities of distributed data
Typically streamed out
One or many receivers of the data
Run over general purpose infrastructure
Data is time sensitive, but not necessarily real
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time