To exemplify the temporal scalability, Figure 2(a) presents a simple scenario where the base
layer consists of one subgroup of frames and the enhancement layer of another. A hypothetical
receiver in a slow-bandwidth network would receive only the base layer, hence producing a
jerkier video (15 frames per second, hereafter labeled as fps) than the other. On the contrary,
the second receiver (that would benefit from a network with higher bandwidth) would be
able to process and combine both layers, thus yielding a full-frame-rate (30 fps) video and
ultimately a smoother video reproduction. Thereafter, Figure 2(b) illustrates an example of
spatial scalability, where the inclusion of enhancement layers increases the resolution of the
decoded video sample. As shown, the more layers are made available to the receiver, the
higher the resolution of the decoded video is. Finally, Figure 2(c) show the concept of quality
scalability, where the enhancement layers improve the SNR quality of the received video
stream. Once again, the more layers the receiver acquires, the better the user’s quality of
experience is.
On top of the