Aucun titre de diapositive

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Marwen HASNAOUI Maher BELHAJ Mihai
MITREA Françoise PRETEUX
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A contradiction in terms?
Between myth
and reality!
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Context
Justice
VOD server
BOB
Selection
Buy Right
Distribution
Send content
Internet
Storage
MPEG-4 AVC
Watermarking
Challenge Real time, robust watermarking for
MPEG-4 AVC
Video visual redundancy eliminated
Video visual redundancy exploited in order to
hide watermark
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A. Golikeri, and R.M. Mersereau Robust
digital video watermarking scheme for H.264
advanced videocoding standard, Journal of
Electronic imaging 16, 2007.
Best robustness

• QIM Mark generation

M. Noorkami, P. Nasiopoulos, and Z. J. Wang
Compressed-domain video watermarking for H.264,
IEEE Intl. Conf. on Image Processing, Vol. 2,
September 2005.
Best transparency

• Perceptual shaping
• adapted to syntax
• features

Large data payload
D. Zou, and J.A. Bloom H.264/AVC STREAM
REPLACEMENT TECHNIQUE FOR VIDEO WATERMARKING 2009.

• Embedding at the
• Decoder side

Less complexity
ComWat algorithm (May 2010)
Multi-symbole ComWat algorithm
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Between myth and reality
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Between myth and reality
Selected Host AC block x
Key k
Message m
Input
Mark generation
Block selection
YES
NO
Output
Watermarked block z
Block x
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Between myth and reality
4x4 contrast sensitivity table
4x4 sub- macroblock
DC 1 5 6
2 4 7 12
3 8 11 13
9 10 14 15
DCT




0.7 0.58 1.20 2.39
0.58 1.12 1.49 2.30
1.20 1.49 3.07 4.35
2.39 2.30 4.35 7.25
IDCT
Perceptual mask
DC 1 5 6
2 4 7 12
3 8 11 13
9 10 14 15
DCT int
IDCT int
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Between myth and reality
Input x original tAVC perceptual mask
output original
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Between myth and reality
Selected Host AC block x
Key k
Message m
Input
Mark generation
Perceptual shaping
Energy selection
YES
NO
Output
Watermarked block z
Block x
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Between myth and reality
The inserted bit m 0
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Between myth and reality
The inserted bit m (M-2)/M
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Between myth and reality
Selected Host AC block x
Key k
Message m
Input
Mark generation
Perceptual shaping
Energy selection
YES
NO
Output
Watermarked block z
Block x
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Between myth and reality
Unmarked block energy
The standard deviation of energy of unmarked
selected blocks
Marked block energy
The mean of energy of unmarked selected blocks
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Between myth and reality
Quantization step
Key
Watermarked block
Detection variable
Without attack
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Between myth and reality
Quantization step
Key
Attacked block
Detection variable
After an attack
Without attack
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embbeding
Subjective Quality
Objective Quality
Similarity measures
PSNR 60.5
AAD 0.47
PMSE 0.0003
IF 999.73
Correlation measures
Marked video
Original video
SC 0.99
NCC 0.99
a 0.84, ?160, m5
Psycho visual measures
DVQ 0.06
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Transcoding
Stirmark
Noise addition
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Attack Noise matrix
embbeding
detection
0
2
-2
0
1
1
2
-2
0
1
With energy selection
Without energy selection
Number of -2 detected under condition -2 was
inserted to total number of inserted bits
-2 -1 0 1 2
-2
-1
0
1
2
-2 -1 0 1 2
-2 0,9 0,02 0,02 0,01 0,05
-1 0,06 0,87 0,05 0,01 0,01
0 0 0,06 0,89 0,04 0,01
1 0,01 0,02 0,04 0,9 0,03
2 0,02 0,01 0,11 0,04 0,92
-2 -1 0 1 2
-2 0,2 0,2 0,2 0,2 0,2
-1 0,2 0,2 0,2 0,2 0,2
0 0,2 0,2 0,2 0,2 0,2
1 0,2 0,2 0,2 0,2 0,2
2 0,2 0,2 0,2 0,2 0,2
Number of -2 detected under condition 1 was
inserted to total number of inserted bits
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Attack Noise matrix
embbeding
detection
1
0
2
-2
0
1
1
2
-2
0
1
1
0
0
With energy selection
Without energy selection
-2 -1 0 1 2
-2
-1
0
1
2
-2 -1 0 1 2
-2 0,77 0,11 0,02 0,01 0,09
-1 0,12 0,69 0,15 0,03 0,01
0 0,03 0,14 0,73 0,08 0,02
1 0,01 0,04 0,06 0,81 0,08
2 0,07 0,02 0,04 0,11 0,76
-2 -1 0 1 2
-2 0,2 0,2 0,2 0,2 0,2
-1 0,2 0,2 0,2 0,2 0,2
0 0,2 0,2 0,2 0,2 0,2
1 0,2 0,2 0,2 0,2 0,2
2 0,2 0,2 0,2 0,2 0,2
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Attack Noise matrix
embbeding
detection
1
0
2
-2
0
1
1
2
-2
0
1
1
0
0
With energy selection
Without energy selection
-2 -1 0 1 2
-2
-1
0
1
2
-2 -1 0 1 2
-2 1 0 0 0 0
-1 0 1 0 0 0
0 0 0 1 0 0
1 0 0 0 1 0
2 0 0 0 0 1
-2 -1 0 1 2
-2 1 0 0 0 0
-1 0 1 0 0 0
0 0 0 1 0 0
1 0 0 0 1 0
2 0 0 0 0 1
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