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1、3142006M8null nullv()Journal ofKunm ingUniversity of Science andTechnology ( Science andTechnology)Vo.l 31null Nonull4null Aug. 2006l: 2005- 03- 25.BTe:l*( 1981- ),o,V.1Z_:,m),3/. E- mai:l cxl_725 ho-tmai.l comBHVSM3E曹小玲1, 蔡翔云2( 1.v,434023;2.v,2650093)K1: 以离散余弦变换(DCT)a离散小波变换(DWT)a静态图像压缩编码为基础,依据人眼视觉特
2、性(HVS),提出了一种将二维数字水印信息(灰度图像)经过压缩编码变换后,嵌入到经 DWT和 DCT变换的原始载体图像的数字水印算法.实验结果表明,此算法对叠加噪声aJPEG压缩a平滑滤波a几何剪切a旋转变换等攻击均具有较好的鲁棒性.1oM: 离散余弦变换;离散小波变换;人眼视觉特性;数字水印ms|: TP391DSM: AcI|: 1007- 855X( 2006)04- 0054- 04ADigitalWatermarkAlgorithm Based onHVSandSpatial- DomainTechniquesCAO X iao-ling1, CAI Xiang-yun2(1. Sc
3、hoolof Information andM athematics, YangtzeUniversity, Jingzhou, Hubei434023, China;2. Faculty of Science, KunmingUniversity ofScience and Technology, Kunming 650093, China)Abstract: Based on the Discrete Cosine Transform( DCT), DiscreteW avelet Transform (DWT), still imagecompression coding techniq
4、ue, and Human Visual System (HVS), the 2- dimensional digitalwatermark( grayimage), which has been compression- coding transformed, is embedded into the host image after DWT andDCT. Experimental results show that the proposed watermarking scheme is robust againstvarious signalprocess-ing such as noi
5、se adding, JPEG compression, smooth filtering, cropping, and rotating transform.Keywords: discrete cosine transform; discretewavelet transform; human visual system; digitalwatermarking08/?ZW,83XM1%5.dF/X%5,73/ZAUv.3TBr338/m,Xj1,i-B 1.C3mE,VLCA1Vsv2:bWZEMZE.ZV1pIn,-vMZE.MZE5mTM,=M( DFT)a?M(DCT)aloM(D
6、WT),YVMtMF.MZE, Langelaar3f3; Cox44bj$1s,; HsuWu5545|8m8null8svDCT,3.7K+MW,tE$4Ek.5-E$,8j$d(HVS),4BM3E.sL_,E?F|),ZV.1EXInV1p,E5|SmB)los,?M,DCTj$Y+,Ymj$rT-4Hq/,DCTMM,HVS+43u3.InZ,E5|=3I)B=,H30vDCT,F|).2E82null13!=3m64 null 64mW = w(i, j), 0null i P, 0null j Q,w(i, j)iaj.Lm3,DCTm/,|=v/IB=:1)|=3Ws8 nul
7、l 8m0v;2)m0vDCT,iDCT./?5!9:4.vJPEGS,Zig- Zag,|=-10DCT(1DCs9ACs),;.=/,DCs-4ACs8,5ACs4.,VIB=V = v(k), 0 null k Nw, v(k) null0, 1,Nw = P nullQ8 null 8 null (1+ 4) null 8+ 5 null 4) = 15(P nullQ)16 .3)Bh=3(m)bWM1,43EZ,c8mBss?s,B=VyM:X31 Nw,V_,V7B=X = x(k), 0null k Nw .2null23VloM(DiscreteW aveletTransfo
8、rm, DWT)+MsR1,|sBsOqI|(ReferenceSignal)#M%|(Detailed Signal),B/,I|%|cB/|.lomZW,X|msOqs;sOqMzs;K3I.loMj$dmMMV,$BEsrm).7?M(D iscrete CosineTransform, DCT)y?|?sbaj$7+a9eOLCaS=SMY+,9Wj1.null,jnull,T?|DWTDCTF8,s1nullnull,5|ZVn|Bz4T.In,/V3:1)!SmI,vlN nullN,B)loM,|S8msLL(%|s),LH (s),HL(s),HH (Ls)s,BsvlN2 nu
