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In this paper a robust image watermarking algorithm based on DCT by Arnold transform and spread spectrum is proposed. The watermarking image is scrambled by Arnold transform to enhance its privacy. The specific second high-frequency DCT coefficients of the original image are selected effectively according to Human Visual System (HVS) and characteristic of digital image processing and then encrypted...
In this paper, we propose a new robust digital image blind watermark scheme that is used to protect color medical images. In this scheme, K-L transform is applied to an RGB medical image and the binary watermark is embedded into low frequency sub-band of DWT of the principal component of medical images. The embedding positions are chosen according to the human visual system (HVS). The embedding method...
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