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多媒體網路安全實驗室
Lossless Data Hiding for
Color Images
Source:Eighth ISDA ’08 8th International Conference on Intelligent Systems
Design and Applications, 2008.
Authors:Ching-Hui Huang, Chih-Chiang Lee ,
Hsien-ChuWu, and Chung-Ming Wang
Speaker:Cheng Hsu
Date:2010/12/29
多媒體網路安全實驗室
Outline
1. Introduction
2. Related Works
3. The Proposed Method
4. Experimental Results
5. Conclusions
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1. Introduction
In this paper, a novel lossless data hiding
scheme is presented to exhibit high datahiding capacity for color palette images.
In the proposed method, each index value
is predicted by using the average of its
four precedent neighbors.
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Traditional
Lossless data
datahiding
hidingscheme
scheme
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2. Related Works
Tian’s method Embedding phase
( Pi ,Qi ) (200,195)
Pi Qi 200 195 395
A
197
2
2
2
d i Pi Qi 200 195 5
secret data b 1
d i ' 2 d i b 2 5 1 11
the new piexls ( Pi ' , Qi ' )
d i '1
11 1
Pi' A
197
197 6 203
2
2
di '
11
Qi ' A 197 197 5 192
2
2
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Extracting phase
( Pi ' , Qi ' ) (203,192)
Pi 'Qi ' 203 192 395
A'
197
2
2
2
d i ' Pi 'Qi ' 203 192 11
b LSB(d i ' ) LSB(11) 1
d i ' 11
di 5
2 2
d i 1
5 1
Pi A'
197
197 3 200
2
2
di
5
Qi A' 113 197 2 195
2
2
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3. The Proposed Method
Diagram of data embedding process
多媒體網路安全實驗室
(a) Palette C
(b) Index table I
Color palette image components
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3.1 Define the embedding parameter eb
1 4
Step1 : average value xi xi ,k
4 k 1
difference d i xi xi
Step2 : d i ' 2 d i 1
predictive template of index
if d i ' may overflow and eb d i , eb d i
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3.2 Data embedding procedure
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3.3 Data extracting procedure
1 4 '
Step1 : average value xi ' xi ,k
4 k 1
difference d i ' xi ' xi '
Step 2 :
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Step3 : Generate the embedded index tabl e I by all xi and the original
cover image G is obtained by the same palette P and index tabl e I
Step4 : All secret data s is collected by s s0 s1sB-1
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4.Experimental Results
Test image and the embedded
The embeddable positions of test image
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Performance comparisons among lossless data embedding methods on test
palette images
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5. Conclusions
In this paper, they have presented a novel
lossless data hiding scheme capable of
providing a high payload for color palette
images.
The difference expansion method has
been applied to embed secret data into
differences and to keep high stego-image
quality after hiding data.
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