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Image authentication is usually approached by checking the preservation of some invariant features, which are expected to be both robust and discriminative so that content-preserving operations are accepted while content-altering manipulations are rejected. However, most of existing features have not obtained convincing performance due to insufficiency of experiments and over biasing of robustness...
A scheme is proposed to implement commutative video encryption and watermarking during advanced video coding process. In H.264/AVC compression, the intra-prediction mode, motion vector difference and discrete cosine transform (DCT) coefficients' signs are encrypted, while DCT coefficients' amplitudes are watermarked adaptively. To avoid that the watermarking operation affects the decryption operation,...
Robust watermarking techniques are always used for copyright and ownership assertion purposes. And many watermark embedding schemes in transform domain are proposed, such as 2-D DFT, 2-D DCT, 2-D DWT, 3-D DCT and 3-D DWT. Among them, the former three ones are used to transform image data, and the latter two ones are used to transform video data or 3-D image data. In this paper, we present an image...
In this paper, two novel transforms are defined, which are respectively called DWT-IDCT transform and DCT-IDWT transform, and then two novel watermarking schemes based on these two transforms are proposed. The proposed schemes are compared with the existing scheme based on DWT transform. Furthermore, since the defined transforms can be roundly used, the schemes themselves are compared in order to...
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