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This paper presents a hardware implementation of a reversible watermarking system that can insert invisible, semi-fragile watermark information into digital image in real time. A content dependent binary watermark is generated based on Discrete Cosine Transform (DCT) coefficients of a set of blocks (8×8) that are selected pseudo randomly on the basis of the key supplied. The binary watermark is then...
This paper proposes a data-hiding scheme for quality access control of digital images using a new model of quantization index modulation (QIM). An encoded binary watermark is embedded over N-mutually orthogonal signal points using QIM but without complete self-noise suppression. It is well known that due to insertion of external information, there will be degradation in visual quality of the host...
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