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Nero Digital expert settings
Seite 47
Macroblock
A macroblock describes 16 x 16 pixels and is the elementary
unit in the MPEG standard on which motion coding is also
based.
Matrix
A matrix is a rectangular pattern whose elements are usually
numbers, although they can be other mathematical elements
such as variables of functions. It consists of m lines and n
columns.
In relation to qualification: the values in the matrix are factors
that control the value of the compression. The higher the
number the greater the compression.
Motion Estimation
Motion estimation/ motion search.
MPEG 4
An MPEG standard (ISO/IEC-14496) that describes the
process of video and audio compression, among other things.
Video compression is divided into MPEG-4 AVC (see H264)
and MPEG-4 SP/ASP (see H263).
NC
Not Coded.
P-Frame
Predictive Frame.
Uses only the difference information relative to the previous
and subsequent key images (I-Frames). Because only the
different information is used, not the complete image
information, the degree of compression is greater.
P-VOP
Predicted Video Object Plane. See P-Frame. VOP is only
referred to in the context of coding in the H263 standard.
Prediction
Prediction/estimate
Quantization
General: The generation of a digital signal from an analog
signal.
In video compression: Quantization controls the degree of
compression. It involves the reduction of the value range by a
division-type operation.
Noise
Interference in image or sound. Generally an interfering
parameter with a broad, unspecified frequency spectrum. It
can thus be interpreted as the overlayering of numerous
oscillations or waves of varying amplitude and frequency or
wave length.
Keyframe
See I-Frame.
VOP
A video frame. This is how a frame is referred to in the
context of MPEG-4 SP/ASP.