HELP! * GREY=local LOCAL HTML version of Foils prepared December 2,95

Foil 4 Digital Video: The Basics

From Video Server,Delivery and Compression Technologies SC95 Tutorial on Web Technologies -- December 4,95. by NPAC Team * See also color IMAGE
Computer digital video:
  • a data stream in which a compressed representation of series of images and of the associated audio are stored in an interleaved fashion so that each pixel or sound sample is represented by a series of bits.
  • the data streams are stored on the CD-ROMs or on the hard disk as standard files.
Digital video quality factors:
  • frame rate: 24-30 frames/s (48-60 fields/s) common for analog video. "Good" digital video ranges from 10 to 30 frames/s
  • spatial resolution: analog standards 768x484 (NTSC) or 768x576 (PAL). "Good" digital video: 320x240
  • color resolution: not easily defined for analog video as not all RGB colors are "legal" NTSC colors. Digital representations of the analog video use 4:2:2 subsampling which results in color resolution somewhat lower than 24 bit color. Digital video does not limit color resolution

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