Digital Cinema

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Digital Cinema
digital_cinema.pdf
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Digital Cinema

• In March 2002, seven studiosDisney, Fox, MGM,
• Paramount, Sony Pictures Entertainment,
  Universal, and
• Warner Brothers Studiosestablished Digital
  Cinema
• Initiatives, in Los Angeles, to create a
  specification for digital
• Cinema http//www.dcimovies.com
• Image resolution minimum 2048 by 1080 pixels
  (called 2K
• not exactly 169)
• upgradable to double resolution, (4096x2160,
  called 4K).
• Pixel depth 36 bit/pixel (i.e. 12 bits per
  color)
• Fps 24 or 48

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Digital Cinema

• A digital projection setup costs more ( 100K
  instead of 35K), but
• copies (on hard drives) for distribution cost
  much less than films
• film quality degrades from copy to copy-of-copy
• film quality starts degrading after a dozen
  showings (grease, scratches)
• Compression is needed
• - 6000 TB during editing
• a few TB final uncompressed movie

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Digital Cinema
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Digital Cinema

• MPEG2 gives motion artifactsthe appearance of
  discontinuity or jerkiness in action scenes
• rarely noticeable on a television screen but all
  too apparent on a large screen
• JPEG 2000 is used it compresses whole frames as
  if each were a separate picture, which in fact
  each is. Final size 300 GB
• Sound data size is negligible -gt uncompressed
  CD-quality audio
• Delivery (from the studios to the theaters)?
• Truck (slow hard disk are delicate)
• Fiber optics (secure not available in some
  rural areas)
• Satellite

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Digital Cinema
The projector is normally based on DLP chips, a
technology also used in high-end home projection
TVs. DLP chips modulate light by bouncing it off
arrays micromirrors
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Digital Cinema 3-D

• In the past two ways
• 1. displaying two views of the imageone for the
  right eye, one for the leftusing colored
  filters the moviegoer wears glasses with a red
  filter in one lens and a blue filter in the
  other.
• 2. Using polarized light moviegoers wear
  glasses, in this case with lenses of different
  polarization.
• In digital cinema
• - as in 2. above
• - with active glasses, in which each lens is a
  liquid-crystal shutter. An infrared signal sent
  from the projector tells the shutters when to
  switch to direct the image to the appropriate
  eye. No polarized light or color filter is
  necessary