Digital Asset Management 2011

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What is Multimedia:
–To distribute and present information coded as
• Text, Graphics, animation, audio and video..
–By
• Computer, TV, phone, etc.

a number of key aspects of multimedia:
–Multimedia involves “Many Media”
• THE MEDIA DOMAIN
–Multimedia involves Computers
• THE SYSTEMS DOMAIN
–Multimedia enhances the presentation and 
communication of information
• THE APPLICATION DOMAIN
--------------------------------------------------
Why do we need multimedia?
1.A computer database supports many basic data types:
2.Inadequate to hold documents such as letters, application forms or image (student photograph).
3.Need a document image processing system including:
4.Further enhancement to handle other types of information (voice)A short video clip

Media types can be divided into two groups:
Temporal media types:
• audio, video, music, animation
Non-temporal media typ
• text, graphics, images

---------------------------------------------------
Media Type: 
TextDifferent Representation
  ASCII
  ISO character sets
  Marked-up text
  Structured text
  Hypertext
  
Media Type: Image
Different Representation
  Color model
  Alpha channels
  Number of channels
  Channel depth
  Interlacing
  Indexing
  Pixel aspect ratio
  Compression
  
Media Type: Graphics:
Different Representation
  Geometric models
  Solid models
  Physically based models
  Empirical models
  Drawing models
  External format for models
  
Media Type: Analog Video:
  Different Representation
  Frame rate
  Number of scan lines
  Aspect ratio
  Interlacing
  Hypertext
  Quality
  Component/Composite

Media Type: Digital Video:
Different Representation
  Sampling
  Sampling rate
  Sampling size and quantization
  Data rate
  Frame rate
  Compression
  Support for interactivity
  Scalability
  
Media Type: Videos
Media Type: Digital Audio
Media Type: Audio

Media Type: Music
Different Representation
  Operational/Symbolic
    MIDI
    (Musical Instrument Digital
Interface)

Media Type: Animation 
Different Representation
  Cel models
  Scene-based models
  Event-based models
  Key frames
  Articulated objects and hierarchical
models
  Scripting and procedural models
  Physically based and empirical 
models
-----------------------------------------------------
Characteristics of MM Data
-- challenges about managing MM data
 Huge Size
Data Volume
Similarity-based Search
Quality of Service (QoS)
Synchronization 
Content-Based Retrieval
Temporal Aspects
Media Representation
----------------------------------------------------
Characteristics of MM Data
-- challenges about modeling MM data
1.High level content abstraction is natural to the way humans think
2.Effective modeling of MM data is critical
3.Low level representation of multimedia data, which encodes the physical reality, leads to the problem of huge amounts of data.
4.Another reason for introducing abstractions (providedby the user/system) is to allow the user to refer to the data in terms of abstractions which make up his modeof the application domain.
-----------------------------------------------------
MMDBMS
–a framework that manages different types of data 
potentially represented in a wide diversity of formats
on a wide array of media sources

Uniformly query data represented in different formats
Query data represented in diverse media
Retrieve media objects from a local storage devices in a smooth, jitter-free manner
Provide audio visual presentation of a query result
Deliver presentation to satisfy quality of service requirements
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Multimedia equation
Multimedia = presentation + context
presentation: sensory, aesthetic part （美学）

context = convergence + information + architecture  
• convergence = data +platform + distribution 
• information = storage and retrieval 
• architecture = compression + components + connectivity
Digital Asset Management 2011

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