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http://dx.doi.org/10.3745/KIPSTB.2003.10B.4.419

Wavelet-based Digital watermarking Using Multiple threshold  

Kim, Jae-Won (계명대학교 대학원 컴퓨터공학과)
Nam, Jae-Yeal (계명대학교 정보통신공학부)
Publication Information
The KIPS Transactions:PartB / v.10B, no.4, 2003 , pp. 419-428 More about this Journal
Abstract
Recently, digital watermarking has been proposed as a viable solution to the need of copyright protection and authentication of multimedia data. A robust wavelet-based watermark casting scheme and a watermark retrieval technique are suggested in this paper. We present a method which can add the watermark to the significant coefficients in the DWT domain, and does not require the original image in the detection process. In adaptive watermark casting method is developed to select perceptually significant coefficients for each subband using multiple threshold. In the proposed method, an adaptive multiple threshold scheme is used to reflect characteristics of each subband and complexity of image. The watermark is adaptively weighted in different subbands to achieve robustness as well as high perceptual quality. The watermark, Gaussian random sequence is added to the large coefficients but not in the lowest subband in the DWT domain. Experimental results show that the proposed algorithm produced visually very good watermarked image which has good invisibility to human eyes and very robust against various image processing and compression attacks.
Keywords
Wavelet; Watermarking;
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