Data Hiding Watermarking for Halftone Images

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Presentation transcript:

Data Hiding Watermarking for Halftone Images Ming Sun Fu, Student Member, IEEE, and Oscar C. Au, Senior Member, IEEE, IEEE TRANSACTIONS ON IMAGE PROCESSING, Vol. 11, No. 4, Apr. 2002, pp. 477 -484 Adviser : Dr. Chang, Chin-Chen Reporter : Huang, Chang-Chin Date : 2003/03/18

Outline Introduction Data Hiding without Original Multitone Image (DHST, DHPT, DHSPT) Data Hiding with Original Multitone Image (DHED, MDHED) Conclusions

Introduction Halftone images Error diffusion Jarvis kernel and Steinberg kernel

Data Hiding without Original Multitone Image (DHST, DHPT, DHSPT) Data Hiding Self Toggling(DHST) use seed generate a set of N pseudo-random location. embedded 0 or 255 simple & error correction coding “salt-and-pepper” noise intensity being about 128

Data Hiding without Original Multitone Image (DHST, DHPT, DHSPT) Data Hiding Pair Toggling(DHPT) slave pixel is chosen randomly. two errors are introduced instead of one complexity is slightly larger than DHST fewer “salt-and-pepper” noise M=

Data Hiding without Original Multitone Image (DHST, DHPT, DHSPT) Data Hiding by Smart Pair Toggling(DHSPT) Candidate is Min [conafter(m,n)] Define 2 x0 1 x0

Data Hiding without Original Multitone Image (DHST, DHPT, DHSPT) Data Hiding by Smart Pair Toggling(DHSPT) Ex. before after 1+2+2=5 2+1+2+1+1=7 1 X0=1 1 X0=0 - = 12 +

Data Hiding without Original Multitone Image (DHST, DHPT, DHSPT) - - f(X0, Xmaster) + f(X0, Xmaster) = 0 before after vertical or horizontal master w(i) = 2  conbefore(m, n) + conafter(m, n) = 10 other master w(i) = 1  conbefore(m, n) + conafter(m, n) = 11 Xmaster=1 X0=0 Xmaster=0 X0=1 - -

Data Hiding without Original Multitone Image (DHST, DHPT, DHSPT) conbefore=1+2+2+1=6 conafter=11-6=5 1 conbefore=0 conafter=10-0=10 1 conbefore=2+2=4 conafter=10-4=6

Data Hiding with Original Multitone Image (DHED, MDHED) Error diffusion

Data Hiding with Original Multitone Image (DHED, MDHED) Error diffusion

Data Hiding with Original Multitone Image (DHED, MDHED) Error diffusion

Data Hiding with Original Multitone Image (DHED, MDHED) Data Hiding Error Diffusion

Data Hiding with Original Multitone Image (DHED, MDHED) Modified Data Hiding Error Diffusion

Conclusions

Conclusions