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Reversible image hiding scheme using predictive coding and histogram shifting PowerPoint Presentation
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Reversible image hiding scheme using predictive coding and histogram shifting

Reversible image hiding scheme using predictive coding and histogram shifting

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Reversible image hiding scheme using predictive coding and histogram shifting

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  1. Reversible image hiding scheme using predictive coding and histogram shifting

  2. Outline • Introduction • Related work- Ni et al.s scheme (The histogram-based reversible data hiding ) • The proposed method- Embedding phase - Extraction phase • Experimental results • Conclusion • Comparatives

  3. Introduction Embedding algorithm stego-image Secret data Original image Embedded image Extraction algorithm

  4. Related work (1/2) Peak = 3 Zero = 7 peak Zero Originalimage pixels Ni, Zhicheng., Shi, Y.Q., Ansari, N. and Su, Wei. (2006), Reversible Data Hiding, IEEE Transactions on Circuits and Systems for Video Technology,16 (3), pp. 354-362.

  5. Related work (2/2) Secret data = 1 0 1 1 0 0 Embedded image pixels Ni, Zhicheng., Shi, Y.Q., Ansari, N. and Su, Wei. (2006), Reversible Data Hiding, IEEE Transactions on Circuits and Systems for Video Technology,16 (3), pp. 354-362.

  6. The proposed method (1/6) • Embedding phase error value = basic pixel - residual pixel Originalimage

  7. The proposed method (2/6) • Embedding phase peak2 peak1 zero1 zero2 peak1 = -1, zero1 = -4 peak2 = 0, zero2 = 4

  8. The proposed method (3/6) • Embedding phase Secret data={ 110000010010100110}

  9. The proposed method (4/6) • Embedding phase residual pixel = basic pixel - error value Embedded image

  10. The proposed method (5/6) peak1 = -1, zero1 = -4 peak2 = 0, zero2 = 4 • Extraction phase Secret data={ 110000010010100110}

  11. The proposed method (6/6) • Extraction phase

  12. Experimental results (1/4)

  13. Experimental results (2/4) 4*4

  14. Experimental results (3/4)

  15. Experimental results (4/4) Ni et al’s scheme peak=16591 Capacity=16591 bits Proposed scheme peak=23723 peak=13539 Capacity=37262 bits

  16. Conclusion To achieve a higher hiding capacity , secret data are embedded in the residual images instead of the image histogram.

  17. Comparisons • To compare with related work: • - Reversible medical image watermarking based onwavelet histogram shifting (2011) • Same • - Reversible medical image hiding based onhistogram shifting. • - Two-pairs • Difference • - spatial domain vs. transformed domain (IDWT) • - overflow and underflow

  18. Thanks for your attention!