Min Lei

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—To protect the copyright of digital image, this paper proposed a combined Discrete Wavelet Transform (DWT) and Discrete Cosine Transform (DCT) based watermarking scheme. To embed the watermark, the cover image was decomposed by a 2-level DWT, and the HL2 sub-band coefficient was divided into 4x4 blocks, then the DCT was performed on each of these blocks.(More)
—Few of current video watermarking algorithms can prevent HD videos from unauthorized copying after the production is distributed. This paper proposes a recoverable video watermarking algorithm in DCT domain to achieve this goal. Watermark is first split and modulated by CDMA. Then, after applying boundary detection, frames in one shot are divided into(More)