Image watermarking using block site

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Check BlockConstraintDetect DCT
Block Selection
DCT constraint
Location
Graylevel
Location

Graylevel
Location
Watermark Embedding

Watermark Detection
. . .
x
j

i,j
i,j
i
1

G(X)

N = 3
4
6

23λrwL

110000001111000000111111000000111111
0000000000001111111111110000000011111111000000000000111
111
111
111
00.10.20.30.40.50.60.70.80.9102468101214161820JPEG compression ratioDetection ratio38 dB32.9 dB29.2 dB0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
2468101214161820
JPEG compression ratio

D
e
t
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c
t
i
o
n
r
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38.5 dB33.2 dB29.9 dB
00.10.20.30.40.50.60.70.80.9105101520253035404550JPEG compression ratioDetection ratio38.5 dB32.6 dB29.4 dB0

0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0
5101520253035404550
JPEG compression ratio

D
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o
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38.9 dB33.3 dB29.4 dB

00.10.20.30.40.50.60.70.80.913032343638404244464850dBSignal to Noise RatioDetection ratio0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
20
22242628303234363840
dB
Signal to Noise Ratio

D
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