文章基本信息

标题：Improved Watermarking Scheme Using Discrete Cosine Transform and Schur Decomposition
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作者：Henri Bruno Razafindradina ; Nicolas Raft Razafindrakoto ; Paul Auguste Randriamitantsoa 等
期刊名称：International Journal of Computer Science and Network
印刷版ISSN：2277-5420
出版年度：2013
卷号：2
期号：4
页码：25-31
出版社：IJCSN publisher
摘要：Watermarking is a technique which consists in introducing abrand, the name or the logo of the author, in an image in orderto protect it against illegal copy. The capacity of the existingwatermark channel is often limited. We propose in this paper anew robust method which consists in adding the triangularmatrix of the mark obtained after the Schur decomposition tothe DCT transform of the host image. The unitary matrix acts assecret key for the extraction of the mark. Unlike mostwatermarking algorithms, the host image and the mark have thesame size. The results show that our method is robust againstattack techniques as : JPEG compression, colors reducing,adding noise, filtering, cropping, low rotations, and histogramspreading
关键词：DCT; copyright; watermarking; Schur