Removable visible image watermarking algorithm in the discrete cosine transform domain
journal contribution
posted on 2008-01-01, 00:00 authored by Y Yang, X Sun, H Yang, Chang-Tsun LiChang-Tsun LiA removable visible watermarking scheme, which operates in the discrete cosine transform (DCT) domain, is proposed for combating copyright piracy. First, the original watermark image is divided into 16×16 blocks and the preprocessed watermark to be embedded is generated by performing element-by-element matrix multiplication on the DCT coefficient matrix of each block and a key-based matrix. The intention of generating the preprocessed watermark is to guarantee the infeasibility of the illegal removal of the embedded watermark by the unauthorized users. Then, adaptive scaling and embedding factors are computed for each block of the host image and the preprocessed watermark according to the features of the corresponding blocks to better match the human visual system characteristics. Finally, the significant DCT coefficients of the preprocessed watermark are adaptively added to those of the host image to yield the watermarked image. The watermarking system is robust against compression to some extent. The performance of the proposed method is verified, and the test results show that the introduced scheme succeeds in preventing the embedded watermark from illegal removal. Moreover, experimental results demonstrate that legally recovered images can achieve superior visual effects, and peak signal-to-noise ratio values of these images are>50 dB. © 2008 SPIE and IS&T.
History
Journal
Journal of Electronic ImagingVolume
17Article number
03308Pagination
1-11Location
Bellingham, Wash.Publisher DOI
ISSN
1017-9909eISSN
1560-229XLanguage
engPublication classification
C1.1 Refereed article in a scholarly journalIssue
3Publisher
SPIE, the International Society for Optical EngineeringUsage metrics
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