1. Reversible Data Hiding with Automatic Brightness Preserving Contrast Enhancement
Sourse: IEEE Transactions on Circuits and Systems for Video Technology
Accepted: 2018 Sep 11 ( Early Access )
Authors: Suah Kim, Rolf Lussi, Xiaochao Qu, Fangjun Huang and Hyoung Joong Kim
Speaker: Wang Xu
Date: /01/31

2. Outline Introduction Related work Proposed method Experiment results
Conclusions

3. Introduction(1/2)
Three approaches of automatic image enhancement (AIE) I II
III
Storage
XML
Enhanced
Undo
Original
Enhanced

4. Introduction(2/2)
Contrast enhancement
Original
Contrast enhanced

5. Related work – Multiple repetitions of histogram shifting
Histogram equalization by using multiple repetitions of histogram shifting

6. Proposed method – Bi-directional histogram shifting

7. Proposed method – Brightness preserving
, RHS
, LHS
, RHS or LHS

8. Proposed method – Ps and Pc selection
Ps selection
Pc selection
>
<

9. Proposed method – Side information
S = L || P-1s || P-1c

10. Proposed method – Side information
For the last repetition
S = L || P-1s || P-1c || 16 LSBs
|S|max = H’Pc || 8 bits || 8 bits || 16 bits = H’Pc +32 bits

11. Proposed method – Stop condition

12. Example
RHS

13. Example Ps
L =
P-1s =
P-1c = Pc
|S|max = H’Pc || 32 bits
= 38 bits
= 55 > 38
Secret bits =
(0)17, (1)16 ……

14. Example
= － = － < 0
LHS

15. Example Ps
L = 11
P-1s = Pc
P-1c =
|S|max = H’Pc || 32 bits
= 34 bits
= 35 > 34
Secret bits =
(0)8, (1)9 ……

16. Example Ps Pc
LHS
= － = － < 0
|S|max = H’Pc || 32 bits = 37 bits
= 22 < 37
16 LSBs =

17. Experiment results (1/7)
[3] S. Kim, R. Lussi, X. Qu, and H. J. Kim, “Automatic contrast enhancement using reversible data hiding,” in IEEE International Workshop on Information Forensics and Security, Nov. 2015, pp. 1–5. (ACERDH)
[12] Y.-T. Kim, “Contrast enhancement using brightness preserving bi-histogram equalization,” IEEE Transactions on Consumer Electronics, vol. 43, no. 1, pp. 1–8, (BBHE)
[13] S.-D. Chen and A. R. Ramli, “Minimum mean brightness error bi-histogram equalization in contrast enhancement,” IEEE Transactions on Consumer Electronics, vol. 49, no. 4, pp. 1310–1319, (MMBEBHE)
[14] C. Wang, J. Peng, and Z. Ye, “Flattest histogram specification with accurate brightness preservation,” IET Image Processing, vol. 2, no. 5, pp. 249–262, (FHSABP)

18. Experiment results (2/7)

19. Experiment results (3/7)

20. Experiment results (4/7)

21. Experiment results (5/7)

22. Experiment results (6/7)

23. Experiment results (7/7)

24. Conclusions
Use reversible data hiding method to achieve automatic contrast enhancement
Use adaptive bin selection process to incorporate the brightness preservation
Require smaller storage
Less susceptible to overenhancement

25. Thanks