An AMBTC compression based data hiding scheme using pixel value adjusting strategy Sourse: Multidimensional Systems and Signal Processing, Volume 29, Issue 4, October 2018, pp 1801–1818 Authors: Aruna Malik, Geeta Sikka, Harsh K. Verma Speaker: Guan-Long Li Date: 2018/9/27

Outline Related Work Proposed method Experiment Results Conclusion Absolute moment block truncation coding(AMBTC) Proposed method Experiment Results Conclusion

Related Work – AMBTC (1/2) k: n × n image block x: image block ( 𝑥 1 , 𝑥 2 ,.., 𝑥 𝑘 ) q: the number of pixels greater than the threshold value {𝑎,𝑏} 𝑥 1 𝑥 2 𝑥 3 𝑥 4 𝑥 5 𝑥 6 𝑥 7 𝑥 8 𝑥 9 𝑥 10 𝑥 11 𝑥 12 𝑥 13 𝑥 14 𝑥 15 𝑥 16 1 𝑎 𝑏 𝐵 𝑚 Lema M, Mitchell O (1984) Absolute moment block truncation coding and its application to color images. IEEE Trans Commun 32:1148–1157

Related Work – AMBTC (2/2) quantization level a: 111 130 92 133 97 90 124 106 116 130 92 161 165 133 97 90 170 147 175 140 183 124 194 106 116 111 167 1 161 165 170 147 175 140 183 194 Mean Value : 138 quantization level b: 167

Proposed method (1/4) 𝑎 𝑏 𝑥 1 𝑥 2 𝑥 3 𝑥 4 𝑥 5 𝑥 6 𝑥 7 𝑥 8 𝑥 9 𝑥 10 𝑥 11 𝑥 12 𝑥 13 𝑥 14 𝑥 15 𝑥 16 1 AMBTC Compressed block Original block Bit plane 𝑎 𝑎 𝑠 𝑏 𝑏 𝑠 Secret data bit stream Secret data in base 3 Stego block

Proposed method (2/4) If |a-b|>1 ,embeddable If |a-b|<=1,non-embeddable 130 92 161 165 133 97 90 170 147 175 140 183 124 194 106 116 1 111 167 AMBTC Original block Bit plane Compressed block Secret data bit stream (1010101001000100100101) 2 Secret data in base 3 (12020201201002) 3

Proposed method (3/4) 111 167 Secret data (12020201201002) 3 111 112 166 110 168 𝑖𝑓 𝑆=0, 𝑥 𝑖 = 𝑥 𝑖 𝑖𝑓 𝑆=1, 𝑥 𝑖 = 𝑥 𝑖 +1 𝑖𝑓 𝑆=2, 𝑥 𝑖 = 𝑥 𝑖 −1 Compressed block Stego block

Proposed method (4/4) embeddable : If number of different pixel>2 or different of values >=2 111 167 111 112 167 166 110 168 𝑖𝑓 𝑥 𝑖 = 𝑎 𝑜𝑟 𝑏 , 𝑆=0 𝑖𝑓 𝑥 𝑖 −1= 𝑎 𝑜𝑟 𝑏 , 𝑆=1 𝑖𝑓 𝑥 𝑖 +1= 𝑎 𝑜𝑟 𝑏 , 𝑆=2 Compressed block Stego block Secret data (12020201201002) 3

Experiment Results (1/2) Stego-images of the proposed scheme

Experiment Results (2/2) Lin, C. C., Liu, X. L., Tai, W. L., & Yuan, S. M. (2013). A novel reversible data hiding scheme based on AMBTC compression technique. Multimedia Tools and Applications. Ou, D., & Sun, W. (2014). High payload image steganography with minimum distortion based on absolute moment block truncation coding. Multimedia Tools and Applications. Li,C.H.,Lu,Z.M.,& Su,Y.X.(2011).Reversible data hiding for BTC-compressed images based on bitplane flipping and histogram shifting of mean tables. Information Technology Journal, 10(7), 1421–1426. Chang,C.C.,Lin,C.Y.,& Fan,Y.H.(2008).Lossless data hiding for color images based on block truncation coding. Pattern Recognitation, 41(7), 2347–2357.

Conclusions Bit stream convert to base 3. -> Raise hiding capacity Reversible data hiding in AMBTC compressed Image