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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 | ||
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