Robust Signature-Based Copyright Protection Scheme Using the Most Significant Gray-Scale Bits of the Image
Table 1
Most significant bit (MSB) similarity rate under different attacks.
Attacks
PSNR (dB)
MSB similarity rate (%)
MSB-plane
ROI1
Text blocks2
DC of MSB3
DWT
Average filter5
28.23
96.4
95.6
96.0
96.3
99.6
BPM (25 dB)
22.94
89.0
91.0
85.0
89.4
97.0
Gauss. (G) filter5
36.99
98.8
98.6
99.0
98.8
100
G filter5 & noise
20.19
90.2
89.4
85.0
89.5
98.2
G noise
20.40
90.8
89.8
85.0
89.3
98.2
Histogram equal.
16.51
80.0
79.0
92.4
84.3
80.8
JPEG (quality 0)
22.87
90.8
90.0
87.0
87.3
94.2
JPEG (quality 5)
25.13
93.8
92.6
91.0
93.3
96.0
JPEG (quality 10)
27.49
95.4
94.6
94.0
96.5
98.6
LSRD6
20.16
85.0
88.0
75.0
88.7
92.0
Median filter5
29.65
97.4
96.6
98.0
97.3
99.4
Motion filter5
26.02
95.2
94.2
92.0
95.5
98.8
MSB (30 dB)
30.00
81.0
75.0
75.0
79.6
93.0
MSB (35 dB)
35.00
85.0
86.0
82.0
89.2
98.0
Rot.-crop (2°)
17.15
88.0
88.6
81.0
93.5
89.6
Rot.-scale (2°)
14.18
84.4
86.0
75.0
89.8
85.6
Salt and pepper
17.95
97.8
97.4
98.0
96.8
98.0
Self similarities
26.04
90.0
95.0
90.0
90.2
99.0
Small rand. dist.
16.27
83.0
83.0
80.0
87.0
75.0
unZign
29.08
97.0
97.0
96.0
99.7
100
Wiener filter5
34.61
97.8
97.6
98.0
97.8
100
1Region-of-interest. 2512 textured blocks were chosen from each image. 3MSB-plane was divided into blocks before taking DCT. 44-level wavelet decomposition. 5 window. 6Latest small random distortion.
