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High-Payload Image Steganography Using Two-Way Block Matching

This paper presents a novel high-payload image steganography method leveraging a two-way block matching scheme. The approach incorporates a least significant bit (LSB) substitution system to embed a message within selected pixel planes of the cover image. By utilizing candidate blocks and employing a threshold mechanism, we achieve effective data embedding while maintaining image quality. Experimental results demonstrate significant improvements with an average PSNR of 37.93 dB between the stego and cover images, and 32.41 dB for extracted data fidelity.

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High-Payload Image Steganography Using Two-Way Block Matching

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  1. High-Payload Image Steganography Using Two-Way Block Matching IEEE Signal Processing Letters, vol. 13 no.3, March 2006 Ran-Zan Wang and Yeh-Shun Chen speaker:李惠龍

  2. Outline • Introduction • Proposed scheme • Experimental results • Conclusion

  3. Introduction

  4. MSB LSB 8 7 6 5 4 3 2 1 Introduction • Substitution system • Least-significant-bit (LSB): utilize some mapping rules to embed the message in certain LSB planes of the cover image

  5. Proposed scheme Embed EB/OB, eind/oind, parameters and not-well-match blocks

  6. Proposed scheme • OCand and ECand blocks (amount 2t-1,respectively): • Generate Cand images by replacing the q LSB of CO with its (q+1) to 2q LSB. • Divide Cand image into blocks of size mxn • Two difference blocks PD(D) and ND(D), D={dij} • Use a threshold z and φ to choose OCand and ECand blocks (assign PD(D) to OCand and ND(D) to ECand) c Dist(Dc, Dj)< φ, c-z≤j <c

  7. Proposed scheme • IM blocks • OBr or EBr is defined to be the corresponding odd/even integer closest to μr.

  8. Proposed scheme • IM blocks EX: OBr ODIFFr Br μr=99 + EBr EDIFFr Br μr=99 +

  9. Proposed scheme • Find indices (oind and eind) Embed OBr and oindr or EBr and eindr

  10. Proposed scheme • Sufficiently large error • Dist(ODIFF, OCand) or Dist(EDIFF, ECand) contain large errors. • Directly embed these block in the CO. • The number of not-well-matched blocks:

  11. Proposed scheme • Embedding scheme • Hop method • Key: embedding location • encode by Huffman coding scheme • Embedded data: • Bases, indices, and not-well matched blocks (stego-image) • Parameters: him, wim, k, q, t, z, m, n, and φ • Huffman table

  12. Proposed scheme • Extraction scheme • Extract parameters, Huffman table, and stego-image • Decode stego-image to obtain the bases, indeius and not-well-matched blocks • Generate odd candidate blocks and even candidate blocks from stego-image • Construct IM.

  13. Proposed scheme • Construct IM. • If indi≠2t-1 • Base is odd: Baseindi+ the indith odd candidate block • Base is even: Baseindi+ the indith even candidate block • If indi=2t-1 • Take not-well-matched block

  14. Experimental Results • Parameters: q=2, t=16, z=3, φ=32, and a block size: 4x4

  15. 37.93dB (Stego and Cover) 32.41dB (extract and origin)

  16. Conclusion • Propose a high-payload image steganography method • High quality by two-way block-matching and hop scheme

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