Polymesika Stoixeia

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    03-Dec-2014
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Multimedia in education (in Greek)

Transcript of Polymesika Stoixeia

  • 1.

2. 3. -

  • (multimedia) ( ) , .
  • , - .

4. 5. / / . (, ) ( , , ) 6.

    • ( )
    • - () , -( ).

7.

  • , .

8.

  • , .
  • .

9. 10.

  • , , .
  • , , , .
  • () .
  • .

11.

  • , .
  • , .
  • , , (ADC, Analog to Digital Converters), .

12.

  • . , .
  • . .

13.

  • , (0 1).

14.

  • .
  • , .
  • , . .
  • .

15.

  • , .

16.

  • (line).
  • , .

17.

  • 8000Hz ,11025 Hz, 44100 Hz . .

18. & MIDI

  • MIDI (Musical Instrument Digital Interface) 1980 (synthesizers).
  • MIDI () . MIDI , .
  • MIDI .
  • mid .

19. &

  • audio , mp3, wav, : .
  • bit, ,
  • (, , ) .

20. &

  • () = = (sec) x (Hz) x (bit)
  • 180 sec x 44100 Hz x 16bit = 127,008,000bit = 15,876,000byte = 15,14 MB ,
  • 2 x 15,14 MB = 30,28 MB .

21. &

  • .
  • . 3 CD 32.
  • , .
  • MP3 . 12.5.
  • MP3 32 2.5 B .

22. 23.

  • , , , (graphics).
  • , , , , .
  • ,
    • (vector graphics)
    • (bitmap graphics ).

24.

  • (, ) .
  • .

25.

  • (raster) (pixel)
  • . .

26.

  • :
    • (scanner)

27.

  • ( ) .
  • , .

28.

  • (Image resolution)=
  • 72 ppi 72 pixels () x 72 pixels () = 5.184 .
  • 3x3 72 ppi, :
  • 72 pixels () x 72 pixels () x 3 x 3 = 46.656 pixels.
  • 300 ppi 810.000 pixels.

29. 30.

  • (color depth)= bit pixel.
  • .
    • 1 bit: 2 (.. , )
    • 8 bit: 28 = 256 ( )
    • 24 bit: 224 = 1,677,7216 ()

31.

  • () = = ( ) x ( ) x ( )
    • (1024 x 768)pixels x 24bit = 786,432p x 24bit = 18,874,368 bit = 2,359,296 byte = 2,25 MB

32.

  • RGB , , , (RGB).
  • CMY
  • RGB.
  • RGB , CMY .

33.

  • , . .
  • 800 x 600 ( ) 24bit, 1,44.
  • ,

34. JPEG GIF

  • JPEG Joint Photographic Expert Group . , 100 .
  • GIF(Graphics Interchange Format) 8 bit ( 256 ). .

35. 36. 37.

  • , .
  • , .
  • ,

38.

  • .
  • .
  • (pixels).
  • .

39.

  • (, , ).
  • , .

40.

  • (Liquid Crystal Displays,LCD) , .

41.

  • (frames) .
  • , .
  • .
  • .

42. :

  • (sampling rate)
  • (frame rate)
  • (colour depth)
  • (frame size)
  • = (fps) x (bit) x (pixels) x (sec)
      • 25(fps) x 24(bit) x (600 x 400)(pixels) x 1(sec) =144,000,000bit = 18,000,000byte = 17,17MB

43.

  • , CODECs(compressor / decompressor),.
  • mpeg(Moving Picture Experts Group).

44. CODECs 45. 46.

  • (text) .
    • ASCII(American Standard Code for Information Interchange)

47.

  • (character sets) ISO
  • Mark-up
  • (Hypertext)
  • Unicode ~65,000 , .

48. 49.

  • E (PowerPoint, Impress )
  • (Authoring Tools) ..
    • Director
    • Authorware
    • Flash
    • Multimedia Builder

50.

51.

  • , . . (2000), . , :
  • , . . (2006), ,
  • :
  • , ., , . ., , . (2006), , :
  • , . (2005), ,
  • ..