1. Detectability Improved Tamper Detection Scheme for Absolute Moment Block Truncation Coding Compressed Images
Source: Symmetry, Vol. 10, No. 8, pp. 318 (1-17), Aug. 2018
Author: Wien Hong, Xiaoyu Zhou, Der-Chyuan Lou, Xiaoqin Huang and Cancan Peng
Speaker: Su Guodong
Date: 2019/05/16

2. Outline Introduction Related work Proposed scheme Experiments
Conclusions

3. Introduction(1/2)
Images
46.5 KB
Compressed
Original
3010 KB

4. Introduction(2/2)
Tamper
Authentication
(Tamper detection)

5. Related work---AMBTC AMBTC compression code: ( h, l , bm )
130 92
133
137
143
124
106
116
Low quantization
level l: 122 bm
130 92
161
165
133
171
169
170
137
175
150
143
124
194
106
116
122
169 1
161
165
171
169
170
175
150
194
High quantization
level h: 169 5

6. Proposed scheme(1/8) ---Generation of Authentication codes (ACs)
AMBTC
AC: ( a + b ) bits
( h, l , bm ) h
8-a a
(hM )d
( a + b ) bits AC
Hash function bm
aca
acb
(lM )d
8-b b l

7. Proposed scheme(2/8)---Embedding of ACs
AMBTC
AC: ( a + b ) bits
( h, l , bm )
( h’, l’, bm ) h
8-a a
8-a a
(hM )d*2a +(aca )d
(hM )d
( a + b ) bits AC
(aca )d
Hash function bm
aca
acb
(acb )d
(lM )d
(lM )d*2b +(acb )d
8-b b
8-b b l

8. Proposed scheme(3/8)---Embedding of ACs
AMBTC
AC: ( ) bits
( 169, 122 , ‘ ’ )
( 166, 126 , ‘ ’ ) h
1010
1001
1010
0110
(hM )d*24 +(ac4 )d
(hM )d =10
bm=
‘ ’
(ac4 )d = (0100)10=6
( )
Hash function
aca
acb
(ac3 )d = (110)10 = 6
(lM )d =15
(lM )d*23 +(ac3 )d
01111
010
01111
110 l

9. Proposed scheme(4/8)---Results of LSBR

10. Proposed scheme(5/8)---The MSBs Perturbation Technique (MSBP)
AC: ( a + b ) bits
Minimize: (h-h’) 2+(l-l’)2
( h, l , bm )
( h’, l’, bm ) h
Nine combinations
8-a a
8-a a
|(hM )d -(h’M )d |<=1
(h’M )d*2a +(ac’a )d
(hM )d
(h’M )d
(ac’a )d
Hash function bm
aca
acb
(ac’b )d
(l’M )d
(lM )d
(l’M )d*2b +(ac’b )d
|(lM )d -(l’M )d |<=1
8-b b
8-b b l

11. Proposed scheme(6/8)---Results of MSBP

12. Proposed scheme(7/8)-The Authentication procedures
First stage:
( h, l , bm ) h
8-a a
(hM )d
Untampered
Yes ?
Hash function = bm
aca
acb a b No
(lM )d
Tampered
8-b b l

13. Proposed scheme(8/8)-The Authentication procedures
Second stage:

14. Experiments(1/5)

15. Experiments(2/5)
Results of the first and second stage detections. (a) 1st stage, |ac| = 2; (b) 1st stage, |ac| = 4; (c) 1st stage incorrect detection (|ac| = 4); (d) 2nd stage, |ac| = 2; (e) 2nd stage, |ac| = 4; (f) 2nd stage incorrect detection (|ac| = 4).

16. Experiments(3/5)

17. Experiments(4/5) Second stage detection results of each method.
Lin et al.’s method;
(b) Li et al.’s method; (c) Zhong et al.’s method;
(d) Proposed method.

18. Experiments(5/5)

19. Conclusions
Proposed the MSBs Perturbation Technique to optimize the AMBTC compressed image quality
Provided the 8-bit authentication code for high tampering detection rate
Adjustable the authentication codes' generation

20. Thanks for your listening!