Reversible data hiding based on histogram shifting scheme Reporter: Date: Wan-Yu Lu 2012/12/13.

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Presentation transcript:

Reversible data hiding based on histogram shifting scheme Reporter: Date: Wan-Yu Lu 2012/12/13

2 Introduction(1/3) Data hiding is referred to as a process to hide some information data into cover media. The data hiding schemes can be generally classified into two categories: - Irreversible data hiding - Reversible data hiding

3 Introduction(2/3) SD Secret data Cover image Embedded image Data hiding

4 Introduction(3/3) SD Secret data Reversible data hiding Embedded image Cover image Extract Reversible data hiding

5 Related works – histogram shifting (1/7) Related works – histogram shifting (1/7) Histogram Original gray image Histogram of Lena image Source: Zhicheng Ni, Yun-Qing Shi, Nirwan Ansari, and Wei Su, “Reversible Data Hiding”, IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY(16:3), (P) (Z) Step 1: Generate image histogram

6 Step 2: To shift the pixels of histogram (1)If P>Z → To shift the range of the histogram, [Z+1, P-1], to the left-hand side by 1 unit. (2)If P<Z → To shift the range of the histogram, [P+1, Z-1], to the right-hand side by 1 unit Step 3: To hide the secret data by pixels P (1)If P>Z → To be embedded bit is “1”, the pixel value is changed to P-1. If the bit is ”0”, the pixel value remains. (2)If P<Z → To be embedded bit is “1”, the pixel value is changed to P+1. If the bit is ”0”, the pixel value remains. Related works – histogram shifting (2/7) Related works – histogram shifting (2/7)

7 Original image Peak pointZero point [3+1,6-1] 4 → 5 5 → P=3, Z=6 and P<Z shift to right-hand Related works – histogram shifting (3/7) Related works – histogram shifting (3/7)

Using P=3, 0 → 3 1 → 4 Secret bits: Marked image Related works – histogram shifting (4/7) Related works – histogram shifting (4/7)

→ 0 4 → 1 Marked image P=3, Z=6 Extract Extracted secret bits: → 5 5 → 4 4 → 3 3 → 3 Recover Original image Related works – histogram shifting (5/7) Related works – histogram shifting (5/7)

10 Maximum and minimum points maximum point minimum point Original image Related works – histogram shifting (6/7) Related works – histogram shifting (6/7)

11 Multiple pairs Original image Example of 2 pairs. P2Z1Z2P1 Related works – histogram shifting (7/7) Related works – histogram shifting (7/7)

Thanks for your attention !