X2

MPEG glossary 307
r
"
D
t
q
z
T
s
esult should contain as many zeros as possible! These zeros correspond to the
unimportant" image elements mentioned and will not be transmitted in the data stream.
epending on the encoder parameters regarding the target bit rate, fewer or more values of
he matrix will be declared unimportant by dividing the quantization matrix by the
uantization scaling factor
. Since only whole numbers are used, a division can produce a
ero is the remainder is discarded.
his factor is also a direct measure of the sought image quality of the MPEG data stream,
ince the "Q" in "Q" factor stands for quantization and quality.