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Data Hiding in Binary Image for Authentication and Annotation

Data Hiding in Binary Image for Authentication and Annotation. Source : IEEE Transactions on Multimedia, Vol. 6, No. 4, August 2004, pp. 528-538 Authors: Min Wu and Bede Liu Speaker: Shu-Fen Chiou( 邱淑芬) Date: 2004/10/21. Outline. Introduction

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Data Hiding in Binary Image for Authentication and Annotation

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  1. Data Hiding in Binary Image for Authentication and Annotation Source : IEEE Transactions on Multimedia, Vol. 6, No. 4, August 2004, pp. 528-538 Authors: Min Wu and Bede Liu Speaker: Shu-Fen Chiou(邱淑芬) Date: 2004/10/21

  2. Outline • Introduction • Proposed Method • Experimental Results • Conclusions • Comments

  3. Introduction • A new method to embed data in binary images. • Scanned text • Figures • Signature • Flippable pixels.

  4. Proposed Method (1/7)

  5. Proposed Method (2/7) • Smoothness • Horizontal • Vertical • Diagonal • Anti-diagonal

  6. Proposed Method (3/7) • Connectivity Four way connectivity

  7. Proposed Method (4/7) • Compute flippability • smoothness • horizontal • vertical • diagonal • anti-diagonal • connectivity • Score rules: • (uniform or isolated) • (H=0 or V=0 or SB) • (D=0 or min|Si|<T1) • (flipping change) • (connectivity change) Binary image Score=0.5 – 0.125 + 0.125 – 0.125 = 0.375 Score ≥ T2 : flippable pixel

  8. Proposed Method (5/7) Lookup table

  9. Proposed Method (6/7)

  10. a 16x16 block in original image after shuffling (Blk1) Proposed Method (7/7) • Embed (odd-even mapping)

  11. Experimental Results (1/3) • Signature in signature

  12. Experimental Results (2/3) • Invisible annotation for line drawings '01/01/2000'

  13. Experimental Results (3/3) • Tamper Detection for Binary Document 976-bit embedded, 800 bits form a “PUEE” pattern

  14. Conclusions • Manipulates 'flippable pixels' to enforce a specific block-based relationship to embed. • Can detect unauthorized use, detect alterations, and annotate. • The hidden data can be extracted without using the original image.

  15. Comments Partition blocks Binary patterns Compute Flippable BTC Flippable Embed 000100100…

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