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This paper proposes an image authentication scheme which detects illegal modifications for image vector quantization (VQ). In the proposed scheme, the index table is divided into non-overlapping index blocks. The authentication data is generated by using the pseudo random sequence. Our scheme can adaptively determine both the size of the authentication data and the number of the indices in each index...
In this paper, a watermarking-based image authentication scheme used to verify the contents of transmission grayscale images is proposed. In this scheme, the watermark of one given image is generated from both frequency domain and spatial domain. First, the number of encoding stages of each DWT coefficient during the multi-stage encoding is taken as frequency watermark. Second, the mean values of...
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