Digital Signal Processing Reference
In-Depth Information
Fig. 4.35
A simple example for the pre- and post-processing
Since the two descriptions are generated by odd and even means, at the central
decoder, the video streams from H.264 decoder can be interleaved and realigned in
the same way to achieve the redundant video. According to the labels (“1” or “0”),
the interpolated frames can be deleted, so the redundant video can be down-sampled
to obtain the final reconstruction which has the same frame number with the original
video sequences.
If only one channel works, the side decoder is employed, and four possibilities
should be taken into account:
1. If the current label is “1” but its following label is “0,” the represented frame is
just the reconstructed one.
2. If the current label is “0” but its following label is “1,” the represented frame is
the interpolated frame, and it can be regarded as the reconstructed one.
3. If the current label is “0” and its following label is also “0,” the continuous frames
represented by “0” should be merged to a reconstructed frame.
4. If the current label is “1,” and its following label is also “1,” a new frame should
be interpolated between the two frames denoted by “1.”
In Fig.
4.35
, a simple example illustrates the pre- and post-processing. The
original video sequence has ten frames denoted by frame 1 to frame 10. After up-
sampling, the redundant video has 18 frames. From the figure, we can see even
frames are interpolated adaptively, such as two frames interpolated between frame 1
