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coursenote:005 [2015/11/13 08:49] (current)
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 +<note important>​ 本节编撰作者(鼓励有兴趣的同学自由撰写,总评成绩可适当加分): ​
 +  * [[abcd@gmail.com|张三]] (3080100999), ​  ​编写了...
 +
 +
 +浙江大学2008-2011版权所有,如需转载或引用,请与[[zhx@cad.zju.edu.cn | 作者联系]]。
 +</​note>​
 +
 +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
 +-----------------------------------------------------------------------
 +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 ​
  
coursenote/005.txt · Last modified: 2015/11/13 08:49 (external edit)