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Multimedia Systems. Instructor: Bajuna Salehe Email: Web: Design Considerations of Multimedia Systems. Main Agenda. Human Computer Interaction (HCI) Overview of Software Design Methods

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multimedia systems

Multimedia Systems

Instructor: Bajuna Salehe



Design Considerations of Multimedia Systems

main agenda
Main Agenda
  • Human Computer Interaction (HCI)
  • Overview of Software Design Methods
  • General Methods of Multimedia System Design
human computer interaction hci
Human Computer Interaction (HCI)
  • HCI affects design decisions that are expected to be made during the development of Multimedia Systems.
  • The major focus of HCI is on ‘User Interface’
    • The design of User Interface must well take into account what we call ‘user friendliness’ or ‘Usability’.
human computer interaction hci1
Human Computer Interaction (HCI)
  • The following usability attributes should be considered in designing HCI:
    • Learnability – systems should be easy to use so that the user could be immediately be able to work with it.
    • Efficiency – System should be efficient to use to achieve high productivity once learnt well.
human computer interaction hci2
Human Computer Interaction (HCI)
    • Memorability – The system should be easy to remember.
    • Errors – The system should have low error rate.
    • Satisfaction – The system should be pleasant to use to satisfy user.
  • Just get a quick review of HCI to have more recipes in Multimedia System Design.
overview of software design methods
Overview of Software Design Methods
  • The design of multimedia systems follow the same underlying process of software engineering (SE).
  • Therefore the designer of multimedia systems should be aware of general methods of SE.
    • From Waterfall Model to Object Oriented System Design.
user interface design cycle
User Interface Design Cycle
  • In designing user interface there are three stages:
    • Design stage – Collecting information about users’ needs (Requirement analysis).
    • Implementation/Prototyping Stage – A prototype system is implemented based on the information gathered.
    • Evaluation Stage – Evaluate the prototype, through users’ feedback before the final system is developed.
designing multimedia systems
Designing Multimedia Systems
  • Generally the design process of multimedia systems follows the following steps:
    • Identifying the requirements of the systems.
    • Identifying the design issues.
    • Implementation.
    • Testing and evaluation.
designing multimedia systems1
Designing Multimedia Systems
  • These steps are not well enough to get the project start well in designing multimedia systems.
  • A multimedia systems requires detailed and well-planned approach toward media integration issues.
    • Handling mix of various medium such as audio, animation, text and graphics is the big challenge to the designer.
system requirement
System Requirement
  • This stage is comparable to the ‘requirement specification’. The stage has the following key functions:
    • Provide system definition which outlines the aims and the objectives of the system.
    • To clarify the potential users of the system.
    • To critically evaluate the required hardware as well as the available software platforms and authoring tools.
design consideration
Design Consideration
  • Draw up clear guidelines about the design details.
  • This stage aims at:
    • Design metaphor: Select a ‘real world mental model’ to be used as the key interface design solution for the system (i.e movie, a book, a game, … etc)
design consideration1
Design Consideration
  • Information types and formats: Define information that needs to be integrated into the system, i.e. text, graphics, sound, video, and animation.
  • Navigational structures: To articulate a clear navigational strategy, including the link structure.
  • System controls: To clarify the types and features of controls and tools needed for the systems.
    • May include sound, video and animation controls.
important notes in design of ms
Important notes in Design of MS
  • Furthermore due to their complexity in nature multimedia systems design process should start by taking into consideration their unique characteristics.
    • The huge amount of data that needs to be processed and transmitted in a continuous manner, and the timing constraints that need to be satisfied in order to have an informational message meaningful to the end-user.
important notes in design of ms1
Important notes in Design of MS
  • Another important characteristic is the Quality of Service (QoS) which embraces all the non-functional properties of a system (e.g. power consumption, cost, etc.).
  • In multimedia systems, QoS requirements vary considerably from one media type to another.
    • E.g the video streams require consistently high throughput (high bandwith), but can tolerate reasonable packet errors.
  • Once the design features are defined, the implementation phase of the system begins using multimedia-authoring tools. The implementation stage consists of:
    • Creating a prototype of the system.
    • Beta test the prototype for possible design and control problems.
  • At this stage the system is evaluated against its stated goals. Different types of evaluation approaches including formative or summative could be used.
    • Formative evaluation is like doing system verification (see whether it works perfectly)
    • Summative evaluation involves letting users to use the system and getting feedback from them if it works according to the requirements.