Page 352 - Manual_Movie Edit Pro 2021_EN_Neat

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This matrix will then be multiplied by another matrix, i.e. the quantization matrix.
Exactly how and why this matrix must be created is the biggest secret of encoder
programmers, since this determines the quality of the whole encoding process. What
is known is that the result 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.

Depending on the encoder parameters regarding the target bit rate, fewer or more
values of the matrix will be declared unimportant by dividing the quantization matrix
by the quantization scaling factor. Since only whole numbers are used, a division can
produce a zero is the remainder is discarded.

This factor is also a direct measure of the sought image quality of the MPEG data
stream, since the "Q" in "Q" factor stands for quantization and quality.

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