Dynamic improved pixel value ordering reversible data hiding

Dynamic improved pixel value ordering reversible data hiding u. Source : Information Sciences, vol. 489, pp. 136 -154, July 2019 u. Authors : Shaowei Weng, Yun. Qing Shi, Wien Hong and Ye Yao u. Speaker : Chia-Shou Shih u. Date : 2019/07/25 1

Outline �Introduction �Related work �Proposed method �Experimental results �Conclusions 2

Introduction Smooth IPVO: area 50 50 50 50 The proposed method: 50 50 50 50 8 secret bits > 8 secret bits 3

Introduction Complex area IPVO: 45 49 53 67 44 49 52 67 55 58 63 72 55 59 63 73 61 66 68 74 60 66 67 74 70 74 77 82 70 75 77 83 The proposed method: 45 49 53 67 44 49 53 67 55 58 63 72 61 66 68 74 70 74 77 82 70 74 77 83 4

Related work-Improved Pixel Value Ordering(IPVO) PVO: d = 1 IPVO: d = 0 or 1 5

Related work-Improved Pixel Value Ordering(IPVO) 6

Proposed method Classification of smoothness by pixel neighborhood Original image Data embedding with IPVO Stego image 7

Proposed method c r Original image Target block 8

Proposed method 82 81 89 93 96 95 82 81 89 95 96 93 94 98 99 81 82 89 93 94 95 96 98 99 829881 99 d=-1 81 d=1 82 89 93 94 95 96 98 99 Secret bit = 0 81 82 89 93 94 95 96 98 100 82 81 89 93 96 95 94 98 100 9

Proposed method 82 81 82 93 98 95 82 81 82 95 98 93 94 97 99 81 82 82 93 94 95 97 98 99 -1 0 1 -2 81 82 82 93 94 95 97 98 99 Secret bit = 1 80 81 82 93 94 95 97 98 Secret bit = 0 81 80 82 93 98 95 94 97 100 10

Proposed method 79 77 77 79 76 77 79 77 77 77 76 79 78 76 73 73 76 76 77 77 77 78 79 79 4 1 1 0 0 -1 2 -2 73 76 76 77 77 77 78 79 79 Secret bit = 1 Secret bit = 010 72 76 75 77 77 78 79 80 80 80 77 77 80 76 78 79 75 72 11

Proposed method-extract and recover 80 77 77 80 76 78 80 77 77 78 76 80 79 75 72 72 75 76 77 77 78 79 80 80 5 2 1 0 -1 -2 3 -3 72 75 76 77 77 78 79 80 80 b=1 b=0 b=1 73 76 76 77 77 77 78 79 79 Secret bit = 0101 79 77 77 79 76 77 78 76 73 12

Experimental results Weng et al. ’s Alg: S. W. Weng, J. -S. Pan, L. D. Li “Reversible data hiding based on an adaptive pixel-embedding strategy and two-layer embedding” Inf. Sci. , 369 (2016), pp. 144 -159 Ou et al’s Alg: B. Ou, X. L. Li, Y. Zhao, R. R. Ni “Reversible data hiding using invariant pixel-value-ordering and prediction-error expansion” Signal Process. Image Commun. , 29 (7) (2014), pp. 198 -205 Peng et al. ’s Alg: F. Peng, X. L. Li, B. Yang “Improved pvo-based reversible data hiding” Digit. Signal Process. , 25 (2014), pp. 255 -265 Sachnev et al. ’s Alg: V. Sachnev, H. J. Kim, J. Nam, S. Suresh, Y. Q. Shi “Reversible watermarking algorithm using sorting and prediction” IEEE Trans. Circuits Syst. Video Technol. , 19 (7)(2009), pp. 989 -999 13

Experimental results 14

Conclusions �Dynamic IPVO RDH method �Partition the local complexity into m+1 levels 1

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