Doom9's Forum - View Single Post

MrBunny · 25th May 2003, 17:49

@Acaila

I said to be careful about doing it, not to not do it at all

And I was thinking in terms of JPEG compression, I was unaware that MPEG handled quantization differently.

Can DCTed coefficients be larger than 256 (Or i just 128 if it rounds)? If it can, then even a QM w/ 256 coefficient isn't guaranteed to zero. In that case I still think that using the DCTfilter to zero coefficients is a better alternative than using a custom quant matrix. Otherwise, putting 256 should be sufficient.

25th May 2003, 17:49	#11 \| Link
MrBunny Registered User Join Date: Oct 2002 Posts: 82	@Acaila I said to be careful about doing it, not to not do it at all And I was thinking in terms of JPEG compression, I was unaware that MPEG handled quantization differently. Can DCTed coefficients be larger than 256 (Or i just 128 if it rounds)? If it can, then even a QM w/ 256 coefficient isn't guaranteed to zero. In that case I still think that using the DCTfilter to zero coefficients is a better alternative than using a custom quant matrix. Otherwise, putting 256 should be sufficient.