IEEE-1394: Developed by Apple Computers and introduced as
FireWire, this is a serial data transmission protocol with rates up to
400 Mbits/sec. Sony offers a slightly modified version for
transmitting DV signals named i.LINK, providing transmission
speeds up to 100 Mbits/sec.
Image: An image is a reproduction, or picture of something. The
term is often applied to digitized pictures, consisting of pixels, that
can be shown on a computer display and manipulated by software.
Image compression: Method of reducing the amount of data
required to store digital image and video files.
Interlaced: The screen refresh method used by television systems.
The PAL TV image consists of two interleaved image halves
(fields) of 312½ lines each. The NTSC TV image consists of
two image halves of 242½ lines each. The fields are displayed
alternately to produce a blended image.
Interleave: An arrangement of audio and video to promote smoother
playback and synchronization or compression. The standard AVI
format equally spaces audio and video.
I/O: Input/Output.
IRQ: “Interrupt Request”. An “interrupt” is a temporary break in the
main processing stream of a computer so that housekeeping or
background tasks can be performed. Interrupts can be requested by
either hardware (e.g. keyboard, mouse) or software.
JPEG: Joint Photographic Experts Group, and the standard
developed by them for compressing digital frames based on
DCT.
Kbyte (also KB): One Kbyte (kilobyte) contains 1024 bytes. The
“K” here stands for the number 1024 (2
10
), and not 1000 as in the
metric prefix.
Key color: A color whose display is suppressed so that a
background image can show through. Most commonly used when
overlaying one video sequence on top of another, allowing the
underlying video to display wherever the key color appears.
