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Introduction

Introduction. Tsung-Yi Wu. Introduction. What is a multimedia system? A multimedia system supports the integrated storage, transmission and representation of the discrete media types text , graphics and image and the continuous media types audio and video on a digital computer.

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Introduction

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  1. Introduction Tsung-Yi Wu

  2. Introduction • What is a multimedia system? • A multimedia system supports the integrated storage, transmission and representation of the discrete media types text, graphics and image and the continuous media types audio and video on a digital computer.

  3. A Hybrid (analog/digital) Multimedia System • Early multimedia system, around 1985

  4. Digital Multimedia System • The media streams are digital. They can be processed (e.g., compressed/ decompressed,analyzed) in the computer.

  5. Time-Independent Media • Information is not related to timing of the data stream • All „classic“ media in the computer, such as: • text • graphics (line drawings, vector graphic) • image (photo, pixel graphics).

  6. Time-Independent Media • Example [Kitaoka 2003]

  7. Time-Independent Media • Illusory Motion (Ming-Te Chi et al.)

  8. Time-Independent Media • Example (Image)

  9. Time-Independent Media • Example (Image) Who is angering you?

  10. Time-Independent Media • Example (Image) Who is sad?

  11. Time-Independent Media • Hybrid Image • http://cvcl.mit.edu/publications/publications.html

  12. Time-Independent Media • Example (Graph)

  13. Time-Independent Media • Example (3D Stereogram)

  14. Time-Independent Media • 3D Stereogram • DIY • http://www.flash-gear.com/stereo/ • Why do they look 3D? • http://www.kondo3d.com/stereo/why-3d/why-3d-e.html • Paper

  15. Time-Independent Media • Why do they look 3D?

  16. Time-Independent Media • Example (3D ASCII Stereogram)

  17. Time-Independent Media • Example (3D ASCII Stereogram)

  18. Time-Independent Media • Optical Illusion • http://www.johnsadowski.com/big_spanish_castle.php

  19. Time-Dependent Media • Information is time-related, must be shown to the user at specific points in time • Continuous data streams • Data appears in regular intervals • Examples: • Video (continuous)

  20. Time-Dependent Media • Examples: • An animation (not a continuous stream, but time-dependent) • An interactive game on the Internet (not a continuous stream, but has real-time requirements) • Audio (continuous)

  21. Time-Dependent Media • Image Morphing • Morphing is a special effect in motion pictures and animations that changes (or morphs) one image into another through a seamless transition. • Morph Tools • FantaMorph • Fun Morph

  22. Time-Dependent Media • 3D Stereogram Movie in Ascii http://www.kammerl.de/ascii/AsciiStereoMovie.php • 3D Animated Stereograms • http://www.hidden-3d.com/stereogram_theory.php

  23. Multimedia System • Integrated • production, • processing, • storage, • representation, • Transmission, etc. of several time-dependent and time-independent media streams

  24. History of Bandwidth in Computer Networks

  25. Network Requirements of Different Types of Data Streams

  26. Multimedia Processing • Compression/Decompression • Encryption/Decryption • Enhancement • Transformation • Recognition • Etc.

  27. Compression • Goal • The compression of multimedia data streams saves • storage space • transmission bandwidth

  28. Compression • Lossless • If the recovered data are assured to be identical to the source • Lossless compression techniques are requisite for applications involving textual data • e.g. ZIP • Lossy • Other applications, such as those involving voice and image data, may be sufficiently flexible to allow controlled degradation in the data

  29. Compression • Lossy • Example (DCT) • Although there is some loss of quality in the reconstructed image, it is clearly recognizable, even though almost 85% of the DCT coefficients were discarded.

  30. Encryption • Example

  31. Encryption • Example

  32. Encryption • Example

  33. Encryption • Example (Decryption)

  34. K K A-B A-B K (m) m = K ( ) A-B A-B Encryption • Text/String encryption algorithm decryption algorithm ciphertext plaintext plaintext message, m K (m) A-B

  35. Enhancement • Examples

  36. Transformation • Example

  37. Transformation • Example • Original • Changed

  38. Recognition • Example

  39. Tools • Matlab I = imread('cameraman.tif'); I = im2double(I); T = dctmtx(8); B = blkproc(I,[8 8],'P1*x*P2',T,T'); mask = [1 1 1 1 0 0 0 0 1 1 1 0 0 0 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]; B2 = blkproc(B,[8 8],'P1.*x',mask); I2 = blkproc(B2,[8 8],'P1*x*P2',T',T); imshow(I), figure, imshow(I2)

  40. Tools • Matlab

  41. Tools • PhotoImpact

  42. Tools • Audacity

  43. FrontPage • HTML • Javascript function encode() { if(document.form2.R1[0].checked){ Result="0分"; } if(document.form2.R1[1].checked){ Result="30分"; } document.form1.S1.value=Result; } • Java

  44. Anfy • Anfy (Java™) includes 52 applets, top effects and menu for web sites and blogs. Plus screensaver.

  45. Flash MX

  46. PowerPoint • Example

  47. PowerPoint • Example

  48. PowerPoint 48

  49. App • http://processing.org/tutorials/android/

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