PRINTINGANDDIGITALMEDIATECHNOLOGYSTUDYTol.223No.22023.04印刷与数字媒体技术研究2023年第2期（总第223期）RESEARCHPAPERS研究论文基于混沌加密的QR码彩色图像复合水印算法马婷*，李佳(中国民用航空飞行学院计算机学院,广汉618307)摘要本研究提出了一种基于NSCT-DWT-SVD复合的QR码混沌加密彩色图像水印算法。首先将“飞行学院”四字组成的水印图像通过编码器进行QR编码生成QR码水印信息，再对水印进行Logistic混沌映射加密，将RGB颜色模型的原载体图像转换成YUV颜色模型图像，对转换后的模型Y分量进行提取，将其进行NSCT生成低频分量，随后进行小波变换及SVD奇异值分解获得奇异值，最后将加密的QR码通过加性原理叠加到分解后的奇异值上。通过实验证明，该算法得到的峰值PSNR为52.15dB，保证了嵌入水印的信息量及隐蔽性，对椒盐噪音、JPEG压缩攻击NC值都为1，尤其是由于加入NSCT保证了图像的平移不变性，SVD更是提高了算法抵抗旋转攻击的能力。关键词QR码；Logistic混沌映射加密；YUV；NSCT；DWT；SVD；多重数字水印算法；彩色图像中图分类号TS801.3;TN911.73;TP391.41文献标识码A文章编号2097-9474(2023)02-50-07DOI10.19370/j.cnki.cn10-1886/ts.2023.02.006CompoundWatermarkingAlgorithmoftheColorImageBasedonChaoticEncryptionandQRCodeMATing*,LIJia(SchoolofComputerScience,CivilAviationFlightUniversityofChina,Guanghan618307,China)AbstractInthisstudy,acolorimagewatermarkingalgorithmbasedonNSCT-DWT-SVDcompositeQRcodechaoticencryptionwasproposed.Firstly,thewatermarkimagecomposedofthefourcharacters“FlightAcademy”wasQRcodedbytheencodertogeneratetheQRcodewatermarkinformation.ThewatermarkwasencryptedwithLogisticchaoticmap.TheoriginalcarrierimageinRGBcolorspacewasconvertedintoYUVcolorspace.ThecomponentYoftheconvertedmodelwasextracted.ThecomponentYwasperformedtheNSCTtogeneratethelowfrequencycomponents.Then,thewavelettransformandSVDsingularvaluedecompositionwereperformedtoobtainsingularvalues.Finally,theencryptedQRcodewassuperimposedonthedecomposedsingularvaluethroughtheadditiveprinciple.TheexperimentsshowedthatthepeakPSNRobtainedbythealgorithmis52.15dB,whichguaranteestheamountofinformationandconcealmentoftheembeddedwatermark.Thesalt,peppernoiseandtheJPEG收稿...
