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This paper proposes a method that incorporates secret image sharing with progressive transmission based on the integer discrete cosine transform (IntDCT). The idea is to apply IntDCT coefficients after a combination process as input of the (r, n)-threshold model instead of directly sharing the secret pixels. A coarse version of the secret image can be decrypted by Lagrange interpolation with a small...
A novel MDC algorithm based on discrete cosine transform (DCT) and the set partition in hierarchical trees (SPIHT) is proposed in this paper. Different from the commonly used DCT algorithm, all the transformed coefficients are reshaped into the wavelet decomposition structure to facilitate the use of the SPIHT algorithm. Then the direction-based information is used to form the three different channels...
Most available H.264 watermarking methods either require large expense of time or are rather fragile to intended attacks. In this paper, we present a novel watermarking scheme, which satisfies with the requirements of both rapidity and robustness. The proposed scheme directly embeds watermarks into H.264 bit streams at the decoder by modifying the quantized DC coefficients in luma residual blocks...
In this paper, a novel robust audio watermarking algorithm based on discrete cosine transform (DCT) and vector quantization (VQ) is proposed. The original audio signal is first segmented into frames. The embedding process for each frame is as follows. First, the original frame is DCT transformed, and several middle-frequency coefficients are composed of a vector to be modified. Then the labeled-codeword...
Image hashing function maps an image into a bit string which can be used to authenticate the originality of the image. In this paper, we propose a perceptual image hashing scheme that is secure and robust to visually insignificant changes but fragile enough to detect and precisely locate malicious attacks. The proposed image hashing method is based on the outlines of one-dimensional signals re-arranged...
In this paper, a novel robust audio watermarking algorithm is presented. It takes full advantage of the multi-resolution and the energy compression properties of the discrete wavelet transform (DWT) and discrete cosine transform (DCT) respectively, and embeds a pseudorandom permuted binary image in the original audio signal by vector quantization (VQ). The original audio is first transformed using...
This paper presents a digital watermarking scheme based on the discrete cosine transform (DCT) and singular value decomposition (SVD). In the proposed method, selected mid-band DCT coefficients from 8x8 block DCT are selected to form blocks which are later decomposed into three matrices, i.e. U, S and V. Finally the original watermark is also partitioned into blocks and then embedded into the matrix...
This paper proposes a reversible data hiding scheme for 3D point cloud model. The method exploits the high correlation among neighboring vertices to embed data. It starts with creating a set of 8-neighbor vertices clusters with randomly selected seed vertices. Then an 8-point integer DCT is performed on these clusters and an efficient highest frequency coefficient modification technique in the integer...
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