This paper proposes a novel coding strategy to achieve distortion minimization for H.264 steganography with quantized discrete cosine transform (QDCT) coefficients. Currently, with the help of syndrome-trellis codes (...
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This paper proposes a novel coding strategy to achieve distortion minimization for H.264 steganography with quantized discrete cosine transform (QDCT) coefficients. Currently, with the help of syndrome-trellis codes (STCs), state-of-the-art image steganography embeds messages while minimizing a heuristically defined distortion function. However, this concept cannot be directly ported to steganography using compressed video as the cover media. According to the intra prediction principle, an H.264 QDCT coefficient block is predicted and coded based on previously encoded blocks, so even a slight embedding change will set off a chain reaction in the remaining cover blocks. Considering the cover block dependency, we make necessary changes to the standard trellis coding structure so as to be applicable for the joint compression embedding scenario. During the coding/embedding procedure, we maintain multiple contexts corresponding to possible optimal routes, and retrace each route periodically to determine how each cover block should be modified. After each modification, the remaining cover blocks, as well as their embedding costs, are re-evaluated, and each context is updated to reflect the embedding effect. In this way, the global optimality can be approached progressively in a block-by-block manner, so our proposed method is named progressive trellis coding (PTC). Extensive experiments have been conducted, and corresponding results show that the adoption of PTC brings about a significant gain in embedding performance.
NASA Technical Reports Server (Ntrs) 19940009436: trellis coding with Continuous Phase Modulation (Cpm) for Satellite-Based Land-Mobile Communications by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19940009436: trellis coding with Continuous Phase Modulation (Cpm) for Satellite-Based Land-Mobile Communications by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19920014857: Combined trellis coding and Feedforward Processing for Mss Applications by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19920014857: Combined trellis coding and Feedforward Processing for Mss Applications by NASA Technical Reports Server (Ntrs); published by
Reversible data hiding technique usually generates low-quality images when the relative payload is high. This paper proposes a novel, reversible data hiding scheme that provides improved performances. First, a distort...
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Reversible data hiding technique usually generates low-quality images when the relative payload is high. This paper proposes a novel, reversible data hiding scheme that provides improved performances. First, a distortion-oriented, minimized, (DOM) embedding algorithm is proposed. By using a cascading trellis coding algorithm, the overall modifications to the host coefficients are minimal, and some specified host coefficients are kept intact. Following that, the proposed DOM algorithm is used in the discrete wavelet transform (DWT) domain. To increase the payload, both the scaling coefficients and the wavelet coefficients are involved in computation. However, by using the DOM algorithm, the scaling coefficients are kept unchanged. By these approaches, the proposed scheme provides high quality to the stego image and reversibility to the host image without the problems of overflow and underflow. Furthermore, by using a multi-round embedding operation, a high payload is achieved. Experimental results show that the proposed scheme outperforms the state-of-the-art reversible hiding schemes. (C) 2015 Elsevier Inc. All rights reserved.
In this work, for a turbo trellis coded communication system over relay channel, system performance is tried to be enhanced by employing different mappings at relay and source. Moreover, considering the trellis encode...
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ISBN:
(纸本)9781479948741
In this work, for a turbo trellis coded communication system over relay channel, system performance is tried to be enhanced by employing different mappings at relay and source. Moreover, considering the trellis encoders at the source and relay together, the trellis of relay encoder is designed to minimize the overall system symbol error rate. The performance of the proposed algoritms are figured out via simulations and superior performance is achieved compared with classical channel coded scheme.
This paper examines the implementation of multi-level amplitude modulation enforced by trellis coding in a downlink non-orthogonal multiple access channel for visible light communication (VLC). The non-orthogonal tran...
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This paper examines the implementation of multi-level amplitude modulation enforced by trellis coding in a downlink non-orthogonal multiple access channel for visible light communication (VLC). The non-orthogonal transmission is applied using superposition coding and successive interference cancellation with the support of a trellis decoder. The VLC is addressed by a channel model according to Lambert. Two levels of maximum likelihood signal detection are observed and compared, each for corresponding 4 and 8 trellis-coded modulation (TCM). The power ratio allotment is examined to investigate the system performance in the bit error rate. The simulation showed that a threshold of power ratio is needed to ensure good performance of signal detection. Further simulation with successive detection had shown effective results for up to three users.
In this letter, we first propose a novel coding method to design content-adaptive H.264 steganography with quantized discrete cosine transform (QDCT) coefficients. Currently, the state-of-the-art steganographic method...
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In this letter, we first propose a novel coding method to design content-adaptive H.264 steganography with quantized discrete cosine transform (QDCT) coefficients. Currently, the state-of-the-art steganographic methods minimize a heuristically defined distortion function using STCs and embed messages in a pixel-wise manner. When this concept is directly applied to H.264 steganographic designing, there are two factors that hinder the improvement of empirical security: interaction of embedding changes, and the block-wise characteristics of video compression. Our proposed CEC scheme performs both message embedding and video compression in the block-wise manner where a cluster of elements in a cover block are modified simultaneously, and defines a joint distortion function on the cover block to reflect the features of rate-distortion optimization. Experimental results demonstrate the effectiveness of our proposed coding method.
Two novel designs of multilevel coset codes are proposed. The systems are designed by combining convolutional codes and set partitioning of a binary linear block code. Several example codes are given. The simulation r...
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Two novel designs of multilevel coset codes are proposed. The systems are designed by combining convolutional codes and set partitioning of a binary linear block code. Several example codes are given. The simulation results show that the proposed coding schemes outperform the existing convolutional codes of similar trellis complexity.
NASA Technical Reports Server (Ntrs) 19920005017: Flexible Digital Modulation and coding Synthesis for Satellite Communications by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19920005017: Flexible Digital Modulation and coding Synthesis for Satellite Communications by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19950025800: the Telecommunications and Data Acquisition Report by NASA Technical Reports Server (Ntrs); published by
NASA Technical Reports Server (Ntrs) 19950025800: the Telecommunications and Data Acquisition Report by NASA Technical Reports Server (Ntrs); published by
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