Updated 18/11/2012Home » Video Glossary » Quantize Matrix

Quantize Matrix

Quantize matrix or quantization matrix is a term used in all MPEG video encoders, both software and hardware, which refers to the two 8x8 blocks of numbers appearing under the Quantize Matrix tab in the settings on some encoders.

These 8x8 blocks of numbers are used by the encoder to perform the best optimization for the appropriate video format. Quantization matrices are used to decide how accurately the frequencies present in the image need to be represented. Lower frequencies use lower quantization and produce a higher accuracy.

These blocks of numbers represent the mathematical functions that the encoder will perform in order to best optimize the video for the appropriate format. Settings vary between a video being encoded as computer animation intended for a computer monitor or full motion video intended for a television. Different Matrix are used for progressive frame and interlaced and also the matrix varies (should) dependent on bit rate.