Authors: Chin-Chen Chang, Yi-Hui Chen, and Chia-Chen Lin

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Presentation transcript:

Authors: Chin-Chen Chang, Yi-Hui Chen, and Chia-Chen Lin 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 VQ Related works The proposed scheme SMVQ and CSMVQ The proposed scheme Experimental results Conclusions

Introduction Secret data: 011 Receiver Reconstructed Image Compression code 1000011010… Sender Compression Code: 1000011010… Host Image Secret data: 011

Introduction – Vector Quantization (VQ)

Related works – SMVQ (1/3)

Related works – SMVQ (2/3)

Related works – CSMVQ (3/3) Variable-rate SMVQ with a Block Classifier

The proposed scheme (1/11) Luminance-sorted Algorithm Red pixel value Blue pixel value Luminance value Green pixel value

The proposed scheme (2/11) Luminance-sorted Algorithm

The proposed scheme (3/11)

The proposed scheme (4/11)

The proposed scheme (5/11)

The proposed scheme (6/11) Assume that the secret data is 001 If Distortion (K0, Original Pixel) < threshold T Output: 1  indicator 100  compression code 4 Phase-1 data embedding K Else if Distortion (K0, Original Pixel) > threshold T Use sorted color palette to embed secret data (Phase-2 data embedding)

The proposed scheme (7/11) Phase-2 data embedding P Best codeword If D(Pc', P12) < D(Pc', P7) Secret data: 0 Indicator: 0 0111 Secret data: 1 1100 P Else if D(Pc', P12) > D(Pc', P7) Secret data: 0 Indicator: 0 0000 Secret data: 1 1111 1100 1100

The proposed scheme (8/11) Extracting Procedure

The proposed scheme (9/11) Phase-1 extracting policy  indicator = 1 Ex: the inputted compression code is ‘100’ 4 < 3 Decode with K0 The retrieval Secret data is 001 K

The proposed scheme (10/11) Phase-2 extracting policy  indicator = 0 Ex: the inputted compression code is ‘0000’ Secret data is 0 P Input next compression code 1100  12 Decode this pixel with P12

The proposed scheme (11/11) Phase-2 extracting policy  indicator = 0 Ex: the inputted compression code is ‘0111’ P 7<12  Secret data is 0 If D(Pc', P12) < D(Pc', P7) Decode the pixel with P12 Else Decode the pixel with P7

Experimental results (1/4) The color host images with size 512 × 512 Lena Pepper Baboon Three stego-images for threshold T=20 PSNR: 35.422 dB Hiding capacity: 304 Kb PSNR: 33.005 dB PSNR: 30.827 dB Hiding capacity: 271Kb Hiding capacity: 257 Kb

Experimental results (2/4)

Experimental results (3/4)

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.

Thank you so much!