文章基本信息

标题：Performance Comparison of DCT and Walsh Transforms for Watermarking using DWT-SVD
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作者：Dr.H.B. Kekre ; Dr.Tanuja Sarode ; Shachi Natu 等
期刊名称：International Journal of Advanced Computer Science and Applications(IJACSA)
印刷版ISSN：2158-107X
电子版ISSN：2156-5570
出版年度：2013
卷号：4
期号：2
DOI：10.14569/IJACSA.2013.040220
出版社：Science and Information Society (SAI)
摘要：This paper presents a DWT-DCT-SVD based hybrid watermarking method for color images. Robustness is achieved by applying DCT to specific wavelet sub-bands and then factorizing each quadrant of frequency sub-band using singular value decomposition. Watermark is embedded in host image by modifying singular values of host image. Performance of this technique is then compared by replacing DCT by Walsh in above combination. Walsh results in computationally faster method and acceptable performance. Imperceptibility of method is tested by embedding watermark in HL2, HH2 and HH1 frequency sub-bands. Embedding watermark in HH1 proves to be more robust and imperceptible than using HL2 and HH2 sub-bands.
关键词：thesai; IJACSA; thesai.org; journal; IJACSA papers; Discrete Wavelet Transform (DWT); Discrete Cosine Transform (DCT); Singular Value Decomposition (SVD); watermarking.