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Object Orientated Data. Topic 5: Multimedia Technology. Object Orientated Data Types. Created on a computer not by sampling real world information Details are stored on the attributes ( properties ) of each object that is stored in the file.

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object orientated data

Object Orientated Data

Topic 5: Multimedia Technology

object orientated data types
Object Orientated Data Types
  • Created on a computer not by sampling real world information
  • Details are stored on the attributes (properties) of each object that is stored in the file.
  • Each object can be altered by changing its attributes…
examples
Examples
  • Text
    • A character in a text file can be given a different size, colour or font
  • MIDI music
    • A note in a MIDI sound can be given a different volume, length or pitch
  • Drawing
    • A shape in a drawing can be given a different size or fill colour
  • 3D image
    • An object in a 3D image can be given a different location, rotation or texture
object orientated data files
Object Orientated Data Files
  • All data is stored as a group of objects within a file
  • Each object can be edited individually without affecting any others
  • All aspects of each object are decided by its properties (attributes)
  • These files are basically a collection of objects with details about them. This means they can be stored as plain text files.
input of object orientated data
Input of Object Orientated Data

Although OOD can be created using nothing but a simple text editor there are specialised input devices to help users create and edit them

  • You are already familiar with a keyboard for entering text
specialised input devices
Specialised Input Devices
  • To create drawings or 3D images a graphics tablet
    • More accurate than using a mouse
  • To enter musical notes a MIDI keyboard
    • Easier than using a computer keyboard
  • 3D digitisers can measure points on an object and generate a 3D object from data
output display of ood
Output / Display of OOD
  • The quality of object orientated data is very dependant on the hardware & software used to output it.
  • For example:
    • Web browser setting can cause the same text to be displayed in different ways on different computers
    • Different graphics cards for rendering 3D images on screen may produce different quality and support different features
object orientated data1

Object Orientated Data

Topic 5: Multimedia Technology

recap
Recap
  • Object Orientated Data
    • All data is stored as a group of objects within a file
    • Details are stored on the attributes (properties) of each object that is stored in the file.
    • Each object can be edited individually without affecting any others
    • These files are basically a collection of objects with details about them. This means they can be stored as plain text files.
vector graphics data
Vector Graphics data
  • A vector is a mathematical term for a line with a specific length and direction.
  • A monitor creates the image by drawing rows of dots
  • Vector displays use the electron beam to draw out the shapes (no colour)
vector vs bitmap
Vector Vs Bitmap

Can be scaled to large sizes, keeping original quality.

Scaling causes pixellation.

Only the image as a whole can be edited.

Individual objects can be edited.

Are easily converted to bitmap formats.

Are very difficult to convert to vector formats

File sizes are relatively small.

File sizes can be large.

Images can be very realistic (e.g. digital photograph).

Difficult to create realistic images

vector vs bitmap1
Vector Vs Bitmap

Size of image can be increased keeping quality and file size the same.

Increasing the image size needs re-sampling and increases the file size.

Only individual objects can be edited (it is sometimes impossible to edit only part of the object).

Pixel level editing is allowed - allowing effects such as spray paint, blur, effects and so on.

Same appearance in all systems, regardless of hardware or software.

Dependent on output hardware or software for appearance & quality.

Suitable for natural, hand-drawn looking, realistic images.

Suitable for graphic, unrealistic images and designs.

attributes
Attributes
  • Attributes are the properties that determine what and how objects will appear
attributes1

Object 5

Object 6

Object 7

Object 2

Object 3

Object 4

Object 1

Attributes
object orientated file formats
Object Orientated File Formats

Drawing : SVG

3D : VRML/WML

Digitised sound : MIDI

drawing file formats
Drawing File Formats

Scalable Vector Graphics (SVG)

  • A format for encoding vector graphics in XML (eXtensible Markup Language)
  • Designed to provide vector graphic content in Web pages.
  • Viewing:
    • You must have an SVG capable Browser, a plug-in for your browser or a stand-alone SVG viewer.
3d image file formats
3D Image File Formats

Virtual Reality Modelling Language/ World Representation Language (VRML/WRL)

  • Standard for describing interactive 3D objects and worlds
  • Capable of representing static and animated 3D & multimedia objects with hyperlinks to other media such as text, sounds, movies and images
synthesised sound data midi
Synthesised Sound Data (MIDI)
  • MIDI is a standard that was created to allow musical instruments to be able to communicate with each other
  • A MIDI file consists of Channels (up to 16)
  • Each channel consists of a sequence of messages including:
    • Start of a note
    • Channel to use
    • Pitch of the note
    • Volume to play it at
    • End of note
synthesised sound data midi2
Advantages

Smaller file size

All aspects of music can be edited

Effects can be applied to individual instruments

There is no interference from the recording

Disadvantages

Never sounds as realistic as digitised sound

Dependent on soundcard for quality

Does not contain vocals

Fewer effects can be applied to sound

Synthesised Sound Data (MIDI)