|
|
|
|
|
ABSTRACT:
In this work, we proposed a modified version of 3D SPIHT based video codec. The codec employs the SPIHT coding algorithm using 3-D spatio-temporal orientation trees in video coding, analogous to the 2-D spatial orientation trees in image coding. We have improved the coding efficiency of the 3D SPIHT based codec by adding a preprocessing step that we call zero-shifting. The video codec is fully embedded, so that different degrees of video quality can be obtained with a single compressed bit stream. The codec has been tested using both high motion and low motion standard QCIF video sequences at 10 frames per second. The cost for this embeddedness is the coding delay (latency) to accept 16 frames into a buffer. At low bitrates the proposed scheme outperforms the existing scheme and achieves a gain of 1.5 to 5dB in PSNR, depending on the type of video. We have implemented a Scalable Video Codec that produces a bitstream which supports spatial scalability. This layered based codec is proposed by partitioning the spatial domain frame into four groups and encoding them separately with 3D SPIHT kernel to produce the bit stream. This bitstream not only has spatial scalability features but also keeps the full SNR embeddedness property for only lowest resolution level. In fact, our scalable video codec can be realized for a parallel architecture which in turn will be suitable for efficient hardware realization.
|
|
|
|
STATISTICS
|
|
Click on # to view
|
|
Citations
|
|
0
|
|
References
|
|
0
|
|
Comments
|
|
0
|
|
Quality
|
|
0/0.00
|
|
Interest
|
|
0/0.00
|
|
View(er)s
|
|
1/89
|
|
|
|
|
|
|
| Prev |
Next |
|
