[M4IF Technotes] FGS and frequencies

[sunx]

No, FGS encodes the bitstream into the base layer using the coarse
quantization parameter. The difference between the reconstructed base
layer and the original bitstream is encoded using DCT. The differential
DCT coefficients are stored in form of bit planes. I think SNR scalability
is implemented in Amendment 2 and FGS is implemented in Amendment 4.
On Mon, 9 Dec 2002, Roland Bengtsson wrote:
> Is it correct to say that the baselayer on FGS contain the lowest
> frequencies in a frame and the enhancement layer contain higher frequencies
> in bitplanes? The highest bitplane contain the highest frequency and will
> be removed first if a degration of quality is done.
>
> Is FGS in MPEG-4 the same as signal-to-noise scalability?
>
> I would be thankful if someone would clarify this for me.
>
> Regards Roland
>