Presentation Transcript
Digital data formats for representation of real objects: Digital data formats for representation of real objects Adolf Knoll
National Library of the Czech Republic
adolf.knoll@nkp.cz
Which objects to represent?: 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.
Digital audio and video: Digital audio and video Click on image to see video and on icon to listen
to music
How are they created?: 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)
The analogue signal is digitized: The analogue signal is digitized 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. REAL WORLD vs. ENCODED WORLD