1. An AMBTC compression based data hiding scheme using pixel value adjusting strategy
Source: Multidim Syst Sign Process, vol. 29, no. 4,
pp , 2018
Authors: Aruna Malik, Geeta Sikka, Harsh K. Verma
Speaker: Yi Chen
Date: 05/30/2019

2. Outline Related Work Proposed Scheme Experimental Results Conclusions
Absolute Moment Block Truncation Coding(AMBTC)
Proposed Scheme
Experimental Results
Conclusions

3. Related Work(1/2) – AMBTC
compression
quntization levels
AMBTC compression code: ( H, L, BM )
bitmap

4. Related Work(2/2) – AMBTC
130 92
161
165
133 97 90
170
147
175
140
183
124
194
106
116
130 92
161
165
133 97 90
170
147
175
140
183
124
194
106
116
Original block
pi,j<average: BMi,j=0
pi,j>average: BMi,j=1
111
167 1
Low quantization
level L: 111
High quantization
level H: 167 BM
Compressed block

5. Proposed Scheme(1/5) – embedding
AMBTC compression code: ( H, L, BM )
H - L < 2: Non-embeddable block
H - L ≥ 2: Embeddable block

6. Proposed Scheme(2/5) – embedding
130 92
161
165
133 97 90
170
147
175
140
183
124
194
106
116
111
167
AMBTC compression
L=111
H=167
Original block
Compressed block

7. Proposed Scheme(3/5) – embedding
The 1st L and H keep unaltered
111
167
111
112
167
166
110
168
Secret data in base 2 form:
Secret data in base 3 form:
Compressed block
Stego block
s1='1'
p2=111
p'2=111+1=112
s2='2'
p4=167
p'4=167-1=166
s3='0'
p5=111
p'5=111+0=111

8. Proposed Scheme(4/5) – extraction
Step 1: Calculate the number of different pixel values
the difference of values is < 2
non-embeddable block
the number of different pixel values is < 2
the difference of values is ≥ 2
embeddable block
the number of different pixel values is ≥ 2
embeddable block 8

9. Proposed Scheme(5/5) – extractionL H
111
112
167
166
110
168
the number of different pixel values is ≥ 2
embeddable block
Received block
111
167
s1='1'
p'2=112=L+1
p'2=112-1=111
s2='2'
p'4=166=H-1
p'2=166+1=167
s3='0'
p'5=111=L
p'2=111

10. Experimental Results(1/1)
[1]
[2]
[3]
[4]

11. Conclusions
Achieve 1.5 bpp data hiding capacity as the proposed method hides 1 digit of base 3 representation of the secret data stream into every embeddable pixel
bring lower image distortion because the pixel values are modified at most by 1