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MPEG2 Quantization Problem

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davyzhu

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Hi all,

I am reading book "MPEG Video Compression Standard". And confused with some idea.

First, why the nonintra quantization have a dead zone around zero?

Second, the book said "in intra coding, values are rounded to the nearest integer; whereas in nonintra codeing, values are rounded to smaller integer". Why?

Any suggestions will be appreciated!
Best regards,
Davy
 

1, because after motion compensation, much correlation has been remove and thus a lot of DCT coefficents are close to zero. So ....

For the second one, I have to think about it.
 

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