Databases Reference
In-Depth Information
F I GU R E 16 . 12
Reconstruction of Sinan image encoded using SPIHT at 0.5 bits per
pixel.
update our reconstruction to
26
6
14
10
−6
6
6
6
6
− 6
6
0
0
0
0
0
and our lists become
LIP
:{
3
,
0
), (
3
,
1
)
}
LIS
:{}
LSP
:{
(
0
,
0
), (
0
,
2
), (
0
,
3
), (
0
,
1
), (
1
,
0
), (
1
,
1
), (
1
,
2
), (
2
,
0
), (
2
,
1
), (
3
,
2
)
}
At this stage, we do not have any sets left in the LIS, and we simply update the values of the
coefficients.
Finally, let's look at an example of an image coded using SPIHT. The image shown in
Figure
16.12
is the reconstruction obtained from a compressed representation that used 0.5
bits per pixel. (The programs used to generate this image were obtained from the authors.)
Comparing this with Figure
16.5
, we can see a definite improvement in the quality.
