Reversible Data Hiding

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Reversible Data Hiding Zhicheng Ni, Yun-Qing Shi, Nirwan Ansari, and Wei Su IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, VOL. 16, NO. 3, MARCH 2006 Reporter : Chien-Ting Kuo 2019/4/9

Outline 1. Introduction 2. Proposed Algorithm 3. Experimental Results 4. Conclusions

1. Introduction A novel reversible data hiding algorithm, which can recover the original image without any distortion from the marked image after the hidden data have been extracted, is presented in this paper. It can embed more data than many of the existing reversible data hiding algorithms. This lower bound of PSNR is much higher than that of all reversible data hiding techniques reported in the literature.

Lena image: (a) original, and (b) marked (PSNR = 48.2 dB) Introduction Lena image: (a) original, and (b) marked (PSNR = 48.2 dB)

2. Proposed Algorithm generating the histogram

2. Proposed Algorithm modifying selected range Find Peak point a & Zero Point b Increase 1 with a-b range value

2. Proposed Algorithm embedding hidden data If Embed 1 : Keep the value (a+1) If Embed 0 : (a+1)  a

Proposed Example By Step 1 : Find Peak Point a = 200 230 200 215 210 By Step 1 : Find Peak Point a = 200 Zero Point b = 230

Proposed Example Step 2 : All value between a-b Increase 1 231 201 216 211 Step 2 : All value between a-b Increase 1

Proposed Example Embedding Binary string 00000011 00000111 00001111 00000001 231 201 216 211 If embed value “0” (a+1) a If embed value “1” (a+1) is still (a+1) a= 200 , a+1 = 201

Proposed Example Embedding Binary string 00000011 00000111 00001111 00000001 231 200 216 211 201 If embed value “0” (a+1) a If embed value “1” (a+1) is still (a+1) a= 200 , a+1 = 201

Proposed Example Embedding Binary string 00000011 00000111 00001111 00000001 231 200 216 211 201 If embed value “0” (a+1) a If embed value “1” (a+1) is still (a+1) a= 200 , a+1 = 201

Proposed Example Embedding Binary string 00000011 00000111 00001111 00000001 231 200 216 211 201 If embed value “0” (a+1) a If embed value “1” (a+1) is still (a+1) a= 200 , a+1 = 201

Proposed Example Embedding Binary string 00000011 00000111 00001111 00000001 231 200 216 211 201 If embed value “0” (a+1) a If embed value “1” (a+1) is still (a+1) a= 200 , a+1 = 201

Proposed Example (multi pair)

Proposed Example (multi pair) Find a point having a larger histogram value in each of the following three maximum point pairs {h(a1),h(a12)} , {h(a21),h(a23)} , {h(a32),h(a3)} assume h(a1), h(a23) , h(a3) are the three selected maximum points. Then {h(a1),h(b1)} , {h(a23),h(b2)} , {h(a3),h(b3)} are the three pairs of maximum and minimum points

Proposed Example (multi pair)

4. Experimental Results

4. Experimental Results

5. Conclusion proposed reversible data hiding technique is able to embed about 5–80 kb into a (512 X 512 X 8) grayscale image while guaranteeing the PSNR of the marked image versus the original image to be above 48 dB. This algorithm is quite simple, and the execution time is rather short. the computational complexity is With a computer Intel Celeron 1.4 GHz and the software Matlab 6.5, the total embedding time needed for the Lena image (512 X 512 X 8) is just 100 ms.

Q & A