《影像伪装术》PPT课件

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1、影像偽裝術Dr.Chin-ChenChangDepartmentofInformationEngineeringandComputerScience,FengChiaUniversity,Taichung,TaiwanDataHidingCoverimageHidingsystemSecretmessageStegoimage1010100101111002CoverCarriersImageVideoSoundText3PaletteImageConversionPalette(16color

2、s)Indextable0123456789101112131415(100,125,73)OriginalImage4Tofindtheclosestpairs5C0C1C2C3C4C5C6C7C8C9C10C11C12C13C14C15Palette5UnusedC0,C8,C13,C1410C1C11,C2,C3C4,C5C6,C7C15,C10C12,C9d(C0,C8)>THd(C13,C14)>THC0C1C2C3C4C5C6C7C8C9C10C11C12C13C14C156Inde

3、xTableUnusedC0,C8,C13,C14EncodeIndexTableOriginalImage7Asecretmessage:101010010111100IndexTableC1,C2,C4,C5C6,C7C11,C3C15,C10C12,C910Secretbits1100010111100108Asecretmessage:101010010111100IndexTableC1,C2,C4,C5C6,C7C11,C3C15,C10C12,C910Secretbits11000

4、10111100109Asecretmessage:101010010111100IndexTableSecretbits11000101111001010AdaptiveEmbeddingMethodC0C6C1C7C14S0C5C3C10S1C8C12C11S4C13C15S3C4C2C9S211Secretmessage:(101010010)2=(338)104782015312S2S0S4S2S0S3S1S0S2IndexTable12C2C4C9C0C1C6C7C14C3C5C10C

5、13C15C0C1C6C7C14C2C4C9C8C11C12C0C1C6C7C14C2C4C9S2S0S1S3S0S2S4S0S2S2XS0XS1XS3XS0XS2XS4XS0XS2={(C2,C0,C3,C13,C0,C2,C8,C0,C2),(C2,C0,C3,C13,C0,C2,C8,C0,C4),(C2,C0,C3,C13,C0,C2,C8,C0,C9),…,(C9,C14,C10,C15,C14,C9,C12,C14,C9)}130:(2,0,3,13,0,2,8,0,2)1:(2,0

6、,3,13,0,2,8,0,4)2:(2,0,3,13,0,2,8,0,9)338:(2,0,3,13,6,4,11,6,2)32399:(9,14,10,15,14,9,12,14,9)14Tzengetal.’sDataHidingIndexColor0(133,140,128)1(123,155,130)2(130,144,138)3(126,146,134)4(139,139,143)5(131,161,124)6(137,140,144)7(137,137,140)PaletteC0C

7、1C2C3C4C5C6C7Q:Ci>CjA:Theluminancefunction:l=0.3*r+0.59*g+0.11*bThecolor-orderingrelationship?15>?(96,139,208)(119,159,227)c1c2l1=0.3*96+0.59*139+0.11*208=133.7l2=0.3*119+0.59*159+0.11*227=154.5?(245,130,44)(246,111,143)c1c2l1=0.3*246+0.59*111+

8、0.11*143=155l2=0.3*245+0.59*130+0.11*44=155>c1c2Ex1:Ex2:Q:A:Q:A:16IndexColorl0(133,140,128)136.61(123,155,130)142.72(130,144,138)139.13(126,146,134)138.74(139,139,143)139.45(131,161,124)147.96(137,140,144)139.57(137,137,140)137.3PaletteC0C1C2C3C4C5C6