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Hiding Secret Information in a Color Palette Image with Hybrid Strategies

Hiding Secret Information in a Color Palette Image with Hybrid Strategies. Authors: Chin-Chen Chang, Yi-Hui Chen, and Chia-Chen Lin Speaker: Chin-Chen Chang. Outline. Introduction The proposed scheme Experimental results Conclusions. Receiver. Reconstructed Image.

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Hiding Secret Information in a Color Palette Image with Hybrid Strategies

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  1. Hiding Secret Information in a Color Palette Image with Hybrid Strategies Authors: Chin-Chen Chang, Yi-Hui Chen, and Chia-Chen Lin Speaker: Chin-Chen Chang

  2. Outline • Introduction • The proposed scheme • Experimental results • Conclusions

  3. Receiver Reconstructed Image Compression code 1000011010… Secret data: 011 Introduction • Information Hiding Sender Compression Code: 1000011010… Host Image Secret data: 011

  4. Palette Image • Color-Palette Image Color Palette

  5. The proposed scheme (1/10) • Luminance-sorted Palette Red pixel value Blue pixel value Luminance value Green pixel value

  6. The proposed scheme (2/10) • Luminance-sorted Palette

  7. The proposed scheme (3/10) • Luminance-sorted Palette

  8. The proposed scheme (4/10)

  9. The proposed scheme (5/10)

  10. secret data:001 If D(K0, x) < T 4 Output: 1  indicator 100  compression code The proposed scheme (6/10) • Phase-1 data embedding K x Similar to Else if D(K0, x) > T Go to: sorted color palette

  11. The proposed scheme (7/10) • Phase-2 data embedding P Secret data: 0 or 1 If D(Pc', P12)<D(Pc', P7) Output: 0  Indicator Secret data: 0 0111  compression code Secret data: 1 1100  compression code Else if D(Pc', P12)>D(Pc', P7) Output: 0  Indicator Secret data: 0 0000 1100  compression code Secret data: 1 1111 1100 compression code x’s best similar codeword

  12. The proposed scheme (9/10) • Phase-1 data extraction Compression code: 1100 001 (6, 9, 7) K

  13. P The proposed scheme (10/10) • Phase-2 data extraction Compression code: 000001100 00111 Because 7<12 0 0 SinceD(Pc', P12)<D(Pc', P7) (14, 4, 5) (14, 4, 5)

  14. PSNR: 35.422 dB Hiding capacity: 304 Kb Experimental results (1/3) The color host images with size 512 × 512 Lena Pepper Baboon Three stego-images for threshold T=20 PSNR: 33.005 dB PSNR: 30.827 dB Hiding capacity: 271Kb Hiding capacity: 257 Kb

  15. Experimental results (2/3)

  16. Experimental results (3/3)

  17. Conclusions • A novel scheme is proposed to hide large amount of secret data into a color image. • The qualities of the reconstructed images are good.

  18. Thank you so much!

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