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Hiding Secret Information in a Color Palette Image with Hybrid Strategies

This paper discusses a novel scheme for concealing secret data in color palette images using hybrid strategies. The proposed method involves compression codes and luminance sorting to embed and extract data effectively. Experimental results show good image quality.

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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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