影像伪装术.ppt

MSN Lab 影像偽裝術 Dr. Chin-Chen Chang Data Hiding Cover Carriers Image Video Sound Text Palette Image Conversion Adaptive Embedding Method Tzeng et al.’s Data Hiding Q: Ci Cj A: Q: d(Ci , Cj)=? A: Ex1: Q: How to hide a secret bit A: Using color-mapping function Ex1: Ex2: Embedding Process Embedding Process If the secret data is 0 Embedding Process If the secret data is 1 The Proposed Scheme The clustering Combination technique Experimental Results Host Images Conclusions An adaptive data hiding scheme for the palette images. High embedding capacity and good image quality Thank you very much for your attention !! * * Department of Information Engineering and Computer Science, Feng Chia University, Taichung, Taiwan Cover image Hiding system Secret message Stego image 1 0 1 0 1 0 0 1 0 1 1 1 1 0 0 Palette (16 colors) Index table 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 (100,125,73) Original Image To find the closest pairs * C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 Palette Unused C0, C8, C13, C14 1 0 C1 C11 ,C2 ,C3 C4, C5 C6, C7 C15, C10 C12, C9 d(C0, C8) TH d(C13, C14) TH C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 C12 C13 C14 C15 Index Table Unused C0, C8, C13, C14 Encode Index Table Original Image A secret message: 1 0 1 0 1 0 0 1 0 1 1 1 1 0 0 Index Table C1, C2, C4, C5 C6, C7 C11, C3 C15, C10 C12, C9 1 0 Secret bits 1 1 0 0 0 1 0 1 1 1 1 0 0 1 0 A secret message: 1 0 1 0 1 0 0 1 0 1 1 1 1 0 0 Index Table C1, C2, C4, C5 C6, C7 C11, C3 C15, C10 C12, C9 1 0 Secret bits 1 1 0 0 0 1 0 1 1 1 1 0 0 1 0 A secret message: 1 0 1 0 1 0 0 1 0 1 1 1 1 0 0 Index Table Secret bits 1 1 0 0 0 1 0 1 1 1 1 0 0 1 0 C0 C6 C1 C7 C14 S0 C5 C3 C10 S1 C8 C12 C11 S4 C13 C15 S3 C4 C2 C9 S2 Secret message: (1 0 1 0 1 0 0 1 0)2 = (338)10 4 7 8 2 0 15 3 1 2 S2 S0 S4 S2 S0 S3 S1 S0 S2 Index Table C2 C4 C9 C0 C1 C6 C7 C14 C3 C5 C10 C13 C15 C0 C1 C6 C7 C14 C2 C4 C9 C8 C11 C12 C0 C1 C6 C7 C14 C2 C4 C9 S2 S0 S1 S3 S0 S2 S4 S0 S2 S2 X S0 X S1 X S3 X S0 X S2