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PROJEK INDIVIDU ASAS AUDIO VIDEO DALAM MULTIMEDIA (DDZ2533) BAB 5.0 UNDERSTANDING DIGITAL VIDEO TECHNOLOGY ERNIE YUSNIZA BINTI AB MAJID 900721-03-5742.

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Presentation on theme: "PROJEK INDIVIDU ASAS AUDIO VIDEO DALAM MULTIMEDIA (DDZ2533) BAB 5.0 UNDERSTANDING DIGITAL VIDEO TECHNOLOGY ERNIE YUSNIZA BINTI AB MAJID 900721-03-5742."— Presentation transcript:

1 PROJEK INDIVIDU ASAS AUDIO VIDEO DALAM MULTIMEDIA (DDZ2533) BAB 5.0 UNDERSTANDING DIGITAL VIDEO TECHNOLOGY ERNIE YUSNIZA BINTI AB MAJID 900721-03-5742 10 FEBRUARY 2010 KOLEJ TEKNOLOGI DARULNAIM JLN PDG GOLF, PENGKALAN CHEPA KELANTAN DARULNAIM.

2  The world as we know it is changing, it’s going to digital. The Digital Video Disc  We can rent a movie on DVD  This is new a storage medium that will hold gigabyte of information on a single disc.  It’s enough space to include an entire feature- length film with superior picture and sound.  This is the latest series of advances in digital video technology.

3  On your TV, you can surf the internet, or use a computerized DVR to record hours and hours of programming without videotape.  Video has evolved into digital video, DV.  Video cameras use CCD’s (Charge-coupled devices), which are computer chips that convert the optical images into electrical impulses.  Traditional video – use an analog signal.  Digital video converts the analog signal into binary form, which is represented by a series of zeroes and ones. Digital Video Digital Video Charge Coupled

4  Digital video technology explode in the 1990s.  In 1970s, for special effects frames of analog video were converted into : Digital film Altered  Digital Video Effect systems : Were pass through devices and the frames were not actually stored in memory.  Early 1980s, Digital Still Store devices were capable of storing and recalling individual video frames.  Mid 1980s, digital disc recorder were able playback and record images at the same time. Digital Video Effect

5 4.1 Linear Editing  Traditional video editing is called linear editing.  The video program is edited consecutively from beginning to end.  Is nonconsecutive in nature.  Differences between linear and nonlinear editing :  It can be clearly illustrated by using the analog of an audio cassette tape (linear) and an audio compact disc, CD (nonlinear). Cassette Tape Compact Disc (linear) (nonlinear)

6 4.2 Nonlinear Editing  Avid technology was the company that pioneered the digital video, or nonlinear editing system.  This new style of editing video on the computer in the professional arena.  It was known as desktop video when it original in the consumer realm.  As computer technology continued to evolved, the gap between nonlinear editing and desktop video began to decrease.  The term digital video was coined.

7  It is commonly called today.  Has several distinct advantages over linear editing.  It’s faster, changes are easier to make.  Editors have more creative freedom in arranging their shots.  Easily change the editing order of their shots to see which arrangement they like best.  It does not suffer from generation loss because the video signal is digital.

8 6.1 Video Signal : 1. Chrominance – the color portion of the video signal. 2. Luminance - the black-and-white portion of the video signal.  Primary color – RGB (red, green, blue).  Hue – the actual shade of color being displayed while the saturation refers to the intensity of the color. RGB Color: Luminance Color:

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10 VIDEO CABLE S-VIDEO CABLE

11 6.2 The NTSC Video Signal  Video Signal that broadcast in the United States must adhere to a set of standards that was forth by NTSC.  NTSC – video standard requires that the video signal be broadcast at 525 horizontal lines of resolution and at 30 (29.97) frames per second.  Video images is produce on the TV screen by scanning these lines of resolution in two separate passes – each pass is referred to as a field.  Interlaced video - combine of two fields to form a frame. exp : TV.  Non interlaced – exp : computer monitor.

12  Every pixel in a frame of digital video, contains information.  Standard – 660 x 480 frame = 300,000 pixels.  Compared the size of word processing document, digital video files are enormous.  Three primary factors in digital video : 1.Resolution 2.Frame rate 3.Color depth  Resolution - size of video frame (measured in pixel).  Frame rate – amount of frame that display in one second (measured in frame per second).  Color depth – number of color represent in video images (measured in bit).

13 8.1 Broadcast  Resolution :-  Analog video camera = 640 x 480 pixel.  Digital video camera = 720 x 480 pixel.  Full screen video.  HDTV 2 resolution = 1280 x 720 pixel (progressive) or 1920 x 1080 pixel (interlaced).  Frame rate = digital video 30(29.97) fps  Full motion video  Color depth = 32 bits  Broadcast quality audio is either 48kHz (digital) or 44kHz (analog) 16 bit stereo.

14 8.2 Multimedia  Multimedia are more flexible than they are for broadcast.  Depend upon the configuration of the computer.  Computer with faster processor, faster CD-ROM drives and a lot of RAM will play larger digital video files more smoothly than slower systems.  Resolution = 320 x 240 pixel (analog) or 360 x 260 pixel (digital).  Frame rate = 15 fps.  Color depth = 16 bits, but sometimes increased to 24 bits  Audio = 48kHz or 32kHz (digital) or 44kHz or 22kHz (analog) 16 bits stereo.

15 8.3 Internet  Two basic methods for transmitting video over the internet :- 1. Can make digital video available as a downloadable movie – a copy of the entire digital video could be downloaded to the users computer. o Advantage – the user would have a copy of the digital video movie, remain on the users computer. 2. Stream the video over the internet – video streaming temporarily loads the video into the users computer, frame by frame, either it plays. o The movie cannot be replayed or saved.

16  Resolution – 160 x 120 pixels (analog) or 180 x 120 pixels (digital).  Frame rate – seldom more that 10 fps.  Color depth – usually 8 bit color.  Audio – 11kHz, 8 bit mono, but could also be 22kHz (analog) or 32kHz (digital), 16 bit stereo or higher (if audio quality is a priority).


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