1. Reversible data hiding with contrast enhancement using adaptive histogram shifting and pixel value ordering
Source: Signal Processing: Image Communication 46 (2016) 1-16
Authors: Haishan Chen , Jiangqun Ni , Wien Hong , Tung-Shou Chen
Speaker: Tzu-Meng Wang
Date: /13/2018

2. Outline Related Works Proposed Scheme Experiment Results Conclusion 2

3. Related Work(1/5)
pixel value ordering
A cover block 3

4. Related Work(2/5)
pixel value ordering 3

5. bi: the bit to embed (0 or 1)
Related Work(3/5)
histogram shifting
Part A: histogram bin expansion and embedding fR
(200) fL
(85)
two peaks: fL and fR
bi: the bit to embed (0 or 1)

6. Related Work(4/4)
histogram shifting
histogram bin expansion
b = 2 4 85 95 73 94
193
200
253
207
189
251 1 3 84 95 85 72 94
193
200
254
201
208
189
252

7. Related Work(5/5) Image recovery extracted bin values
histogram shifting
Image recovery
extracted bin values 2 4 85
(1) 95
(0) 73 94
193
200
253
207
189
251 1 3 84 95 85 72 94
193
200
254
201
208
189
252

8. Proposed Method(1/6) AHS: adaptive histogram sifting
BHP: bidirectional histogram pre-shifting

9. Proposed Method(2/6 ) AHS
0 X (2/15) + 1 X (5/15) + 2 X (4/15) + 3 X ( 3/15) + 4 X (1/15) = 1.73 1. 2.
pre-shifted peak-bins at lower and upper ends of histogram

10. Proposed Method(3/6 ) AHS3. =
(0,4) 4.

11. Proposed Method(4/6 ) BHP
4/2 = 2
4-2 = 2
4/2 = 2
4-2 = 2

12. Proposed Method(5/6 ) Bhp

13. Proposed Method(6/6 ) S = {010101100101110111001100000010111110 }2 5 6 7 8 9

14. Experiment Result(1/4)

15. Experiment Result(2/4)

16. Experiment Result(3/4)

17. Experiment Result(4/4)

18. Comment
When the bin expansion is huge, bhp might cause problem