Post on 29-Dec-2015
transcript
Digital data formats for representation of real objects
Adolf KnollNational Library of the Czech Republicadolf.knoll@nkp.cz
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
Click on image to see video and on icon to listento music
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
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