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Digital colour watermarking has become essential and important copyright protection schemes in multimedia industry. Distribution of digital documents, especially colour images, over the internet has also become increasingly cost-efficient and widespread. The increased importance of digital media brings new challenges for securing the distribution of digital multimedia to make it both profitable for...
In this paper a new complete technique using one dimensional Walsh coding to improve the robustness of watermarking in digital images is presented. The proposed technique inserts bits of binary handwritten signatures in the DCT blocks of a digital image. In the proposed method, the 1-D Walsh functions are used to encode the signature before being embedded in the cover image. The 1-D Walsh coding can...
This paper presents two vector watermarking schemes that are based on the use of complex and quaternion Fourier transforms and demonstrates, for the first time, how to embed watermarks into the frequency domain that is consistent with our human visual system. Watermark casting is performed by estimating the just-noticeable distortion of the images, to ensure watermark invisibility. The first method...
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