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Adjustable prediction-based reversible data hiding Source: Authors: Reporter: Date: Digital Signal Processing, Vol. 22, No. 6, pp.941-953, 2012 Chin-Feng.

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Presentation on theme: "Adjustable prediction-based reversible data hiding Source: Authors: Reporter: Date: Digital Signal Processing, Vol. 22, No. 6, pp.941-953, 2012 Chin-Feng."— Presentation transcript:

1 Adjustable prediction-based reversible data hiding Source: Authors: Reporter: Date: Digital Signal Processing, Vol. 22, No. 6, pp.941-953, 2012 Chin-Feng Lee and Hsing-Ling Chen Wan-Yu Lu 2012/12/19

2 2 Outline Introduction Related work – Tseng and Hsiehs’ scheme The proposed scheme – Embedding phase – Extraction and recovery phase Experimental results Conclusions

3 3 Introduction Data hiding is referred to as a process to hide some information data into cover media. The data hiding schemes can be generally classified into two categories: - Irreversible data hiding - Reversible data hiding Reversible data hiding schemes can be classified into two categories: - Difference expansion scheme (DE-based) - Histogram-based

4 4 Introduction Embedding Cover image Stego-image Extraction Secret message Reversible data hiding

5 5 3224401 3830330 121767939 1362551650 Related work – Tseng and Hsiehs’ scheme (1/10) Related work – Tseng and Hsiehs’ scheme (1/10) Pre-processing: 3224401 3830330 121767939 1362551650 3224401 3830331 121767939 1362541651 LKLeft-side scan sequenceRight-side scan sequence 51 011 1 Overhead [27] H.W. Tseng, C.P. Hsieh, Prediction-based reversible data hiding, Information Sciences 179 (2009) 2460–2469

6 6 3224401 3830331 121767939 1362541651 Related work – Tseng and Hsiehs’ scheme (2/10) Related work – Tseng and Hsiehs’ scheme (2/10) Pixel value prediction: 3224401 3830331 121767939 1362541651 Cover image Embed T=2 -------------------------------------------------------------------------

7 7 3224401 3830331 121767939 1362541651 Related work – Tseng and Hsiehs’ scheme (3/10) Related work – Tseng and Hsiehs’ scheme (3/10) Embedding - Case 1 : 3224401 3830331 121767939 136254165 Cover image T=2 -------------------------------------------------------------------------- W=0 W=1

8 8 3224401 3830331 121767939 1362541651 Related work – Tseng and Hsiehs’ scheme (4/10) Related work – Tseng and Hsiehs’ scheme (4/10) Embedding - Case 2 : Cover image T=2 --------------------------------------------------------------------------

9 9 3224401 3830331 121767939 1362541651 Related work – Tseng and Hsiehs’ scheme (5/10) Related work – Tseng and Hsiehs’ scheme (5/10) Embedding - Case 3 : 3224401 3830331 121767939 1362541651 Cover image T=2 --------------------------------------------------------------------------

10 10 3224401 3829340 121788038 1362551630 Related work – Tseng and Hsiehs’ scheme (6/10) Related work – Tseng and Hsiehs’ scheme (6/10) Extracting: Watermarked image T=2 ---------------------------------------------------------------------

11 11 Related work – Tseng and Hsiehs’ scheme (7/10) Related work – Tseng and Hsiehs’ scheme (7/10) Extracting - Case 1 : 3224401 3829340 121788038 1362551630 Watermarked image T=2 --------------------------------------------------------------------------

12 12 Related work – Tseng and Hsiehs’ scheme (8/10) Related work – Tseng and Hsiehs’ scheme (8/10) Extracting - Case 2 : 3224401 3830340 121788038 1362551630 Watermarked image T=2 --------------------------------------------------------------------------

13 13 Related work – Tseng and Hsiehs’ scheme (9/10) Related work – Tseng and Hsiehs’ scheme (9/10) Extracting - Case 3 : 3224401 3830330 121788038 1362551630 Watermarked image T=2 --------------------------------------------------------------------------

14 14 Related work – Tseng and Hsiehs’ scheme (10/10) Related work – Tseng and Hsiehs’ scheme (10/10) Post-processing : 3224401 3830331 121767939 1362541651 Watermarked image T=2 3224401 3830330 121767939 1362551650 LKLeft-side scan sequenceRight-side scan sequence 51 011 1 Overhead 3224401 3830330 121767939 1362551650 Cover image

15 15 The proposed scheme(1/11) 100102101 99101105 1031020 Related work v.s Proposed scheme : Tseng and Hsieh’s scheme 100102101 99101105 1031020 Proposed scheme Prediction value (P) = (102 + 99)/2 = 100 --------------------------------------------------------------

16 16 100102101 99101105 1031020 0 The proposed scheme(2/11) Pre-processing: Cover image 100102101 99101105 1031021 Cover image

17 17 The proposed scheme(3/11) Embedding phase: 100102101 99101105 1031021 Cover image T=0 S=1 -------------------------------------------------------------------------- Rule 1: d ≦ T

18 18 The proposed scheme(4/11) Embedding phase: 100102101 99102105 1031021 Cover image -------------------------------------------------------------------------- T=0 S=1 Rule 2: d > T

19 19 The proposed scheme(5/11) Embedding phase: 100102101 99102106 1031021 Cover image -------------------------------------------------------------------------- T=0 S=1 Rule 2: d > T

20 20 The proposed scheme(6/11) Embedding phase: 100102101 99102106 103 1 Cover image -------------------------------------------------------------------------- T=0 S=1 Rule 2: d > T 0

21 21 The proposed scheme(7/11) Extraction and recovery phase: 100102101 99102106 103 0 Stego-image -------------------------------------------------------------------------- T=0 Rule 2: d’ > 2 x T + 1

22 22 The proposed scheme(8/11) Extraction and recovery phase : 100102101 99102106 103 1 Stego-image -------------------------------------------------------------------------- T=0 Rule 2: d’ > 2 x T + 1

23 23 The proposed scheme(9/11) Extraction and recovery phase : 100102101 99102106 1031021 Stego-image -------------------------------------------------------------------------- T=0 Rule 2: d’ > 2 x T + 1

24 24 The proposed scheme(10/11) Extraction and recovery phase : 100102101 99102105 1031021 Stego-image T=0 -------------------------------------------------------------------------- Rule 1: d’ ≦ 2 x T + 1

25 25 100102101 99101105 1031020 1 The proposed scheme(11/11) Post-processing: Stego-image 100102101 99101105 1031020 Cover image

26 26 Experimental results (1/14) Amount of overhead information associated with different thresholds

27 27 Experimental results (2/14) Embedding rate versus image quality of all tested images with various thresholds. Embedding rate

28 28 Experimental results (3/14) Embedding rate versus image quality of all tested images with various thresholds. Image quality

29 29 Experimental results (4/14) Histograms of prediction-errors for test images “Lena” and “Baboon” obtained using Tseng and Hsieh’s scheme (T = 5).

30 30 Experimental results (5/14) Histograms of prediction-errors for test images “Lena” and “Baboon” obtained using the proposed scheme (T = 5).

31 31 Experimental results (6/14) 37.15 dB and 0.99 bpp 30.78 dB and 0.71 bpp 48.6 dB and 0.2 bpp 47.9 dB and 0.06 bpp

32 32 Comparisons of embedding rates (bpp) of proposed scheme and that of Tseng and Hsieh. Experimental results (7/14)

33 33 Comparisons of image quality (dB) of Tseng and Hsieh’s and the proposed schemes with the same embedding capacity. Experimental results (8/14)

34 34 Experimental results (9/14) Comparisons of embedding rates (bpp) of proposed scheme and that of Tseng and Hsieh at difference thresholds.

35 35 Experimental results (10/14) Comparisons of image quality (dB) of Tseng and Hsieh’s and the proposed schemes with the same embedding capacity.

36 36 Experimental results (11/14) (a)MR_liver_t1 (b)MR_ped_chest (c)MR_sag_head Capacity versus distortion performance of proposed and other schemes for test images: (a) Lena

37 37 Experimental results (12/14) Capacity versus distortion performance of proposed and other schemes for test images: (b) F16

38 38 Experimental results (13/14) Capacity versus distortion performance of proposed and other schemes for test images: (c) Baboon

39 39 Experimental results (14/14) Capacity versus distortion performance of proposed and other schemes for test images: (d) Boats

40 40 Conclusions Flexibility and scalability. - A lower threshold yields a higher visual stego-image quality. - A higher threshold yields a higher embedding rate. To solve underflow and overflow. To Increase the embedding rate and reduce image distortion.

41 Thanks for your attention !

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