Post Production Techniques B.Sc. (Hons) Multimedia ComputingMedia Technologies Video Editing.
B.Sc. Multimedia ComputingMedia Technologies High Definition Television.
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Transcript of B.Sc. Multimedia ComputingMedia Technologies High Definition Television.
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B.Sc. Multimedia ComputingMedia Technologies
High Definition Television
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Agenda
Historical Perspective Comparisons with Traditional TV Basic Specifications of HD Equipment Viewing HD Broadcasting Receiving HD
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B.Sc. Multimedia ComputingMedia Technologies
Historical Perspective
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Traditional TV 405 then 625
405 Lines 625 Lines Where lines is the number of vertical lines of
resolution
Each line contains picture information
More lines means more information =
sharper pictures
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HDTV Lines
Two formats: 1280 x 720 1920 x 1080
Thus HDTV can have up to 1080 vertical lines 1080p means progressive scan - non interlaced 1080i where I stands for interlaced - more flicker True HD is marketed as 1080p
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B.Sc. Multimedia ComputingMedia Technologies
More pixels available with HDTV
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Also higher definition through wider range of colour gradation
Similar comparisons as the differences between 35mm and medium format photography
Or a 1MB camera compared with a 4MB camera
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B.Sc. Multimedia ComputingMedia Technologies
Comparative Resolutions
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HD Specifications
PAL 4:3
HDTV 16:9
Comparative Aspect Ratios
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HDTV Types
Integrated HDTV - or simply, HDTV; DTV with an Internal (built-in) High Definition TV Receiver.
Digital-HDTV-‘Capable’ or 'Ready'- Digital TV that is able to display HDTV - but with the addition of an external HDTV Receiver.
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Display Types CRT (Cathode Ray Tube): Traditional TV Technology –
The established standard for television displays; best overall value picture quality and cost; major drawback is bulk and mass as size increases.
Plasma Display - Ultra-thin design, High Contrast Ratings, 'Fixed Pixel' Display; Size up to 60+ inches; some display limitations – costly, high burn-in risk; picture quality affected by inability to display black-colour; displays are extremely heavy and fragile; picture quality lost as pixels fade; many plasma displays do not display HDTV resolutions. Development continues.
LCD - Liquid Crystal Display; Thin design, size limitations; good computer monitor; sharp picture for static displays; problems displaying images in motion; many LCD Displays are not HDTV capable. Development continues.
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Picture Viewing Methods
Direct-view – Images displayed directly on the picture tube (as in the traditional CRT – Cathode Ray Tube) or one of the new, alternative technologies with a “fixed pixel” screen; ie: LCD (Liquid Crystal Display); Limited Display Size – maximum range, about 40-inches.
Smaller screen sizes, (less than about 34-inches) are less effective for HDTV
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Picture Viewing Methods
RPT - 'Rear Projection TV' – uses multiple, miniature picture tubes, (commonly 3) or pixel display, and a combination of mirrors and lenses to project the image from behind, on to the viewing screen; enables displayed picture to be significantly larger; size ranges: 43 to 70+ inches). Offers best value – picture size and quality at lowest cost.
FPT - 'Front Projection TV' – Projects images forward, to an external screen; more commonly used in Home Theatre Systems for displaying DVD Movies; for DTV/HDTV may require purchasing TV components separately – including, TV Receiver, A/V Receiver, Display Screen and Speaker System. Complete Systems can be extremely costly, and may require professional installation.
Enables an almost unlimited display size.
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B.Sc. Multimedia ComputingMedia Technologies
Rear Projection
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B.Sc. Multimedia ComputingMedia Technologies
Front Projection
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B.Sc. Multimedia ComputingMedia Technologies
Receiving HDTV
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Receiving HDTV
Receive HD Signals via broadcaster HDTV with built in decoder HD Ready TV and additional receiver Display Screen
Plasma TFT
Games consoles support HD signals - Xbox 360 and Playstation 3 (not Ninteno Wii)