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COSC1078 Introduction to Information Technology Lecture 7 Video

James Harland james.harland@rmit.edu.au. COSC1078 Introduction to Information Technology Lecture 7 Video. Introduction. Who is this bloke?. Overview. Questions? WebLearn Test 1 Video Questions?. Introduction to IT. 1 Introduction 2 Images 3 Audio 4 Video WebLearnTest 1

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COSC1078 Introduction to Information Technology Lecture 7 Video

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  1. Intro to IT James Harland james.harland@rmit.edu.au COSC1078 Introduction to Information TechnologyLecture 7Video

  2. Intro to IT Introduction Who is this bloke?

  3. Intro to IT Overview • Questions? • WebLearn Test 1 • Video • Questions?

  4. Intro to IT Introduction to IT 1 Introduction 2Images 3Audio 4VideoWebLearnTest 1 5 Binary Representation Assignment 1 6 Data Storage 7Machine Processing 8 Operating Systems WebLearn Test 1 9 Processes Assignment 2 10 Internet 11Internet Security WebLearn Test 3 12Future of IT Assignment 3, Peer and Self Assessment

  5. Questions? How did you spend 6-8 hours on this course last week? This week? Lecture 7: Video SE Fundamentals

  6. Intro to IT Assessment Process • Submit all assignments via Blackboard in the Learning Hub • Assignment 1 due 11.59pm Sunday 1st April • Assignment 2 due 11.59pm Sunday 6th May • Assignment 3 due 11.59pm Sunday 27th May • Late assignments attract a penalty of 10% per day late, up to a maximum of 50%

  7. Intro to IT Assignment • Assignment will be in three parts • Overall task is to produce a video • Groups of up to 3 • Assessed by final video and group blog • Part 1: images and audio (end of week 5) • Part2: hardware (end of week 9) • Part 3: reflection, research (end of week 12)

  8. Intro to IT Assignment 1 • Use GIMP (or a similar tool) to perform some manipulations on an image • Use Audacity to perform some manipulations on sound • Use a movie making tool to produce something like (and much better than!) ‘Lord of the Controllers 1 & 2’ • Email me your group and its name so that I can set up a blog on the Learning Hub

  9. Overview 01010100001010101010100110100010101001101001010010100011100010101010100101111001001010… Lecture 7: Video Intro to IT

  10. And now for something completely different … Lecture 7: Video Intro to IT

  11. History – which came first? • Invented in 1920’s • Commercially available in 1930’s • Widespread in Australia in 1950’s DOMINATES STANDARDS • Invented in 1940’s • Commercially available in 1960’s • Widespread in Australia in 1980’s Lecture 7: Video Intro to IT

  12. Video formats NTSCNational Television Systems Committee North America, Japan, Taiwan, Caribbean, … PALPhase Alternating Line Western Europe, Australia, New Zealand, Asia, … SECAMSequentiel Couleur avec Memoire France, Russia, Eastern Europe, … “TVs ain’t TVs!” Lecture 7: Video Intro to IT

  13. Cathode Ray Tube (CRT) Before “flat screens” (both and ) Draws horizontal lines Lecture 7: Video Intro to IT

  14. Cathode Ray Tube (CRT) Top to bottom One pass (progressive scan) • Top to bottom • Two passes (interlaced scan) • 1st pass is even lines (lower field) • 2nd pass is odd lines (upper field) • Can create discontinuities in slow replays Lecture 7: Video Intro to IT

  15. Cathode Ray Tube (CRT) Overscan: Not all the image is visible on the screen Allows ‘fuzzy’ edges not to be seen Means content cannot be placed at the very edges Safe action area:centre 90% Safe title area:centre 80% Lecture 7: Video Intro to IT

  16. Cathode Ray Tube (CRT) Safe action area Safe title area Lecture 7: Video Intro to IT

  17. Cathode Ray Tube (CRT) Black and white: only needs luminance (what shade of grey?) Colour: luminance + 2 x chrominance (brightness, 2 x colour or hue) WHY? Lecture 7: Video Intro to IT

  18. Cathode Ray Tube (CRT) Black and white came first! Whencolour transmissionbecame possible, needed ability to receive colour with Black and white: luminance only Colour: luminance, hue, saturation YUV used in PAL, YIQ used in NTSC (!!) Can convert RGB to/from YUV and YIQ (see material for formulae) Lecture 7: Video Intro to IT

  19. Sampling and Quantisation • Sampling • As in image (resolution, or # pixels) • As in audio, ie frames per second • Quantisation • As for images, ie bit depth per pixel • Frame aspect ratio • Viewing width to height 4:3 16:9 Lecture 7: Video Intro to IT

  20. Pixel Aspect Ratio NTSC DV frame is 720 x 480 pixels 720:480 = 3:2 ≠ 4:3 ≠ 16:9 (!!!) ????? DV frame screen Change pixel shape via pixel aspect ratio Lecture 7: Video Intro to IT

  21. Intro to IT Conclusion • Web Test next week (week 5) • Do online quizzes later this week • Keep reading! (book particularly) • Notes for Video in Learning Hub

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