Graphics Reference
In-Depth Information
Table 3.2.
Performance of Algorithm 1 on raster scanned images.
Image
Mode of
max
Max length
Compression
MSQ
PSNR
approx.
for segment
rate in bpp
in db
Lena
line
7
128
1.231
211.817
24.871
segment
10
64
1.084
244.087
24.255
Girl
5
128
1.347
84.673
28.853
7
64
1.215
99.526
28.151
Lena
arc
20
256
1.767
25.763
34.020
segment
25
256
1.602
38.745
32.248
30
256
1.477
56.967
30.574
Girl
20
256
1.839
53.287
30.864
25
256
1.590
77.102
29.260
30
256
1.404
101.274
28.075
Table 3.3.
Performance of Algorithm 1 on Hilbert scanned images.
Image
Mode of
max
Max length
Compression
MSQ
PSNR
approx.
for segment
rate in bpp
in db
Lena
line
8
256
1.122
104.865
27.924
segment
10
256
1.027
110.625
27.692
15
256
0.846
124.338
27.184
18
256
0.692
131.624
26.937
Girl
18
128
0.768
99.579
28.149
20
128
0.720
105.089
27.915
25
128
0.607
119.794
27.346
Lena
arc
25
256
1.644
48.765
31.249
segment
30
256
1.443
56.924
30.577
35
256
1.286
68.758
29.757
Girl
35
256
1.094
81.878
28.999
38
256
1.007
86.545
28.758
40
256
0.974
104.883
27.923
the Lena image, in terms of PSNR value at the same compression rate. At
the compression rate of 1.44 bit/pixel, Algorithm 1 provides a PSNR value
of 30.57 db, while the algorithm due to Kamata et al. provides 30.01 db, and
Algorithm 2 provides 31.22 db. At the compression rate of approximately 1.28
bpp, the PSNR due to Algorithm 1 is 29.75 db; the PSNR due to Kamata's
algorithm is 29.16 db, while Algorithm 2 provides a PSNR of 30.82 db at a
slightly higher compression rate of 1.34 bpp. For the Girl image, Algorithm
2 provides a PSNR value of 28.81 db at the compression rate of 0.68 bpp,
compared to 28.44 db as provided by the algorithm due to Kamata et al.
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