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Robust watermarking provides valuable solutions to protect the copyright and secure digital images. In this paper, a robust and transparent watermarking scheme in the discrete cosine transform (DCT) domain is presented. The watermark is embedded into the difference of two adjacent DCT coefficients located at the same frequency. The embedding process involves optimal selection of adjacent blocks and...
Image watermarking has been generally acknowledged as a pertinent technique for improving authenticity, integrity and data security where medical images are transmitted, stored, retrieved across networks. An improved the quality of remote medical services strictly depends on the ability of the techniques used to ensure ethics and protect the transmitted medical secrets. On the one hand, medical image...
In this work, we investigate the performance of different color spaces for watermarking purpose using quantization method through experimental analysis. We rely on imperceptibility and robustness as a measure of performance of a given color space and its different channels. Eight different color spaces are used in this work. The watermark is inserted into the LL3 subband for each channel of the color...
In this work, we investigate the performance of two watermarking scheme QIM and progressive QIM through a statistical analysis. We rely on imperceptibility and robustness as a measure of performance of a watermarking algorithm. Seven wavelet families are used to generate the carrier signal. We insert the watermark message in approximation as well as in different subbands, at a different level of transformation...
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