Digital data formats for representation of real objects

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Digital data formats for representation of real
objects

• Adolf Knoll
• National Library of the Czech Republic
• adolf.knoll_at_nkp.cz

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Which objects to represent?

• Discrete chunks of reality perceivable by our
  senses
• Visual objects (still images)
• Audio objects (sounds)
• Video objects (moving images)
• Abstract objects (evoked through text)
• Mixed objects, eg. audiovisual ones
• Digital data objects are created through direct
  transformation of these chunks of reality.

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Digital audio and video
Click on image to see video and on icon to
listen to music
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How are they created?

• Directly
• Digital photo camera
• Digital sound recording
• Digital video recording
• Digital text input

• Indirectly through analogue representation
• Classical photograph
• Analogue sound
• Analogue video
• Typewritten text

Digitization produces computer file(s)
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The analogue signal is digitized
REAL WORLD vs. ENCODED WORLD

• Analogue encoding
• Continuous
• For sound must be interpreted as well
• Motion pictures are based on illusion made by
  moving discrete analogue images/frames

• Digital encoding
• Discrete elements
• Must be rendered into analogue
• Motion pictures are based on illusion made by
  moving discrete digital images/frames

Man can perceive and understand only analogue
rendering of information.