Matrox DigiSuite LE, Installation Manual, Page: 124 / 140

112
Appendix B, DigiSuite Glossary
I
IBP compression
See MPEG-2 IBP.
IEEE-1394
An international standard data
transfer protocol created by Apple Computer
under the FireWire trademark and standardized by
the Institute of Electrical and Electronics
Engineers (IEEE). It enables simple, low-cost,
realtime data transfer between computers and
consumer and prosumer electronics products, such
as DV camcorders and DV decks. Commonly
referred to as 1394.
I-frame compression
See MPEG-2 I-frame.
I-frame (Intra-frame)
A frame created during
the MPEG or MPEG-2 compression process that
contains all the information required to reproduce
a complete image. It allows random access points
within a video stream, and acts as a reference point
for B-frames and P-frames to be built. I-frames are
editable because they contain enough data to
construct an entire video frame, unlike B-frames
or P-frames. See also MPEG-2 IBP, B-frame (Bi-
directional frame), and P-frame (Predicted frame).
insert editing
Recording new video and/or
audio material onto a prerecorded (or striped) tape.
Insert edits can be made in any order, unlike
assemble edits, which must be made sequentially.
inter-frame compression
A video com-
pression method that compares a series of frames
in a video sequence and removes the redundant
data. Inter-frame compression treats all the frames
in the sequence as an interdependent group. As a
result, most of the frames can’t be edited
independently. Also called temporal redundancy
reduction. Contrast with intra-frame compression.
See also GOP.
interlaced scanning
A method of creating a
video image by scanning only the odd numbered
lines on the screen in one pass, then the even
numbered lines in the next pass. Two passes are
therefore required to create a complete frame of
video. Non-interlaced scanning displays the odd
and even lines sequentially so that the complete
image is displayed in one pass. NTSC and PAL
displays are interlaced, VGA displays are non-
interlaced.
interpolate
To create a gradual transition
between different DigiSuite effect settings applied
to a clip. For example, interpolating between a
blue tint effect and a red tint effect makes the clip
gradually change from blue to red. See also
keyframe.
intra-frame compression
A video
compression method that removes redundant
information from within a frame. Intra-frame
compression treats each frame of a video segment
independently. Several video compression formats
use the intra-frame method. These include Motion-
JPEG, DV, and MPEG-2 I-frame. Also called
spatial redundancy reduction. Contrast with inter-
frame compression. See also I-frame (Intra-
frame).
ISA slot
Connection slot to a type of computer
expansion bus found in most computers. It’s larger
in size than the PCI slots found on most Pentium-
based computers and provides connections to the
slower ISA bus. A variation found in some newer
computers is the EISA bus.
J
JPEG
(pronounced “jay-peg”) Joint
Photographic Experts Group. A compression and
storage standard used for still, digital images. See
also Motion-JPEG.
K
keyframe
A particular frame at which one or
more DigiSuite effects have been defined on a clip
using the DigiSuite Effects plug-in. Effects applied
at a keyframe remain active on the clip until a later
keyframe is defined to turn off or change the
effects. See also interpolate.