Yaoran Huo

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The ability against the collage attack of semi-fragile watermarking is improved by embedding the watermark of a block in other blocks, but the tamper detection performance is impaired under general tampering. A two-stage detection method is proposed to improve the tamper detection performance of semi-fragile watermarking. For each 8 × 8 block, six-bit(More)
To improve the imperceptibility, security and tamper detection performance, a self-embedding watermarking scheme against JPEG compression is proposed in this work. The recovery watermark of all blocks in the host image, which consists of 6-bit DC-code and 5-bit AC-code and simultaneously used to both tamper detection and tamper recovery, is recombined based(More)
—A semi-fragile watermarking scheme is proposed to discriminate general tampering and collage attack in this paper. Five bits watermark data of each block generated are divided into the general tampering watermark (GTW) and collage attack watermark (CAW), which are embedded in the same block and the other blocks to discriminate general tampering and collage(More)
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