编程代考 CS4551

Multimedia Software Systems CS4551
Introduction to Multimedia
What is Multimedia?
Whatismultimedia?

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multi media
Multi multus : numerous
Media : means that conveys something such as information
From wikipedia.org: Multimedia is the use of several different media to convey information text, audio, graphics, animation, video, and interactivity.
In our class,
Multimedia : the use of several different digitized computer media text,
audio, graphics, animation, video, etc. to convey information.
CSULA CS451 Multimedia Software Systems by EunYoung Kang 2

Inherent Properties of Multimedia
Mixture of different media types
Digital always
Voluminous Multimedia data is huge Interactive data contact human
Synchronization
Understanding these properties is important to design good multimedia applications.
CSULA CS451 Multimedia Software Systems by EunYoung Kang 3
Three Processes that are essential to Multimedia Systems
Multimedia content creation or multimedia authoring
Theprocessinvolvesdigitizingmediaaudio,images,videousingcapture devices and assemblingprocessing them using smart software and hardware.
Storage and compression
Theprocessmostlyinvolvesstateoftheartcompressionalgorithmsand standards for audio, video, images, and graphics.
Distribution
Distribution involves how multimedia content is distributed via various media, such as wired cables, optical networks, satellite, wireless networks, or any combination thereof, to specific platforms ranging from television, computers, personal digital assistants PDAs, and so on.
CSULA CS451 Multimedia Software Systems by EunYoung Kang 4

Media Types Modalities of Multimedia
Current Media Types Text
Video Movies, Documentaries, …
2D3D Graphics Computer Objects
Moving graphics Games, Animations Audio Speeches, Music, MIDI music
Future Media Types?
CSULA CS451 Multimedia Software Systems by EunYoung Kang 5
text is a simple media that contains words to express something
This is a line of text to explain that text
does convey information with a hyperlink
Hypermedia vs. Multimedia
Hypertext:auserinterfaceparadigmfordisplayingdocumentswhich contain automated crossreferences to other documents called hyperlinks.
Hypermedia : Hyperlinks also referring other than text Hypermediaisanapplicationofmultimedia.
CSULA CS451 Multimedia Software Systems by EunYoung Kang 6

Captured picture or computer generated synthesized picture
In the form of a spatial two dimensional array
Width and height
Consists of individual elements called pixels
Pixel depth or bit depth : 1, 2, 4, 8, 16, 24, 30 bits
No particular structure other than pixel
CSULA CS451 Multimedia Software Systems by EunYoung Kang 7
Video How do you describe video?
Moving images
Collection of frames
Frame rates : number of frame displayed per second fps Aspect ratio : ratio of width to height
Scanning format : interlaced or progressive
No particular structure other than pixelframe number
CSULA CS451 Multimedia Software Systems by EunYoung Kang 8

2D Graphics3D Graphics
Computer generated objects
Vector Graphics, 2D Sprites, etc.
Contains structure and are revisable meaning editable
CSULA CS451 Multimedia Software Systems by EunYoung Kang 9
Can be represented by a set of objects and time dependent directives programs to be executed at playtime
Compactness and revisable
Requires processing power for the playback
Can be rendered to a video format movie
CSULA CS451 Multimedia Software Systems by EunYoung Kang 10

How do you describe audio? Waveform, structure, …
Properties
Sampling rate in hertz : of samples per second
Samplesize:numberofbitspersample
Dimensionality: number of channels mono or stereo
Frequency range or frequency band narrow band voice vs. wide band music
Audio Media is of various kinds Speech
Nonspeech sound
MIDIStructuredAudio
CSULA CS451 Multimedia Software Systems by EunYoung Kang 11

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