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An invisible dual watermarking scheme for authentication and copyrights protection

An invisible dual watermarking scheme for authentication and...

引用

International Conference on Emerging Technologies, ICET

作者： Fida Ullah Khattak Abdul Bais Yahya M. Khawaja Department of Computer Systems Engineering N. W. F. P. University of Engineering and Technology Peshawar Pakistan Department of Electrical Engineering Sarhad University of Science and Information Technology Peshawar Pakistan

This paper focuses on two problems, authentication and copyrights protection, faced by digital media in general and digital images in particular. We discuss how two algorithms defined separately can be combined to produce a secure digital camera which provides a solution to these problems. First, a robust quantization based wavelet domain scheme is applied to embed a robust watermark in the image for the purpose of owner identification. After that, a semi-fragile scheme is used to watermark the robust watermarked image for authentication. Experimental results show that recovered robust watermark had high correlation with the embedded robust watermark after different attacks. Under perfect conditions, recovered fragile watermark also showed perfect correlation with embedded fragile watermark, but after attacks, the similarity index dropped indicating that image is not authentic.

关键词： Watermarking Authentication Copyright protection Robustness Digital cameras Public key cryptography Digital images Wavelet domain transform coding Digital signatures

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Image authentication and tamper detection using two complementary watermarks

Image authentication and tamper detection using two compleme...

引用

IEEE International Conference on Image Processing

作者： Xiaojun Qi Xing Xin Ran Chang Computer Science Department Utah State University Logan UT USA

This paper presents a novel semi-fragile watermarking scheme for image authentication and tamper detection. The proposed scheme extracts content-based image features from the approximation subband in the wavelet domain to generate two complementary watermarks. Specifically, we generate an edge-based watermark sequence to detect any changes after manipulations. This edge-based watermark encodes the invariant relationship between quantized wavelet coefficients after incidental distortions. We also generate the content-based watermark to localize tampered regions. Both watermarks are embedded into the high frequency wavelet domain to ensure the watermark invisibility. Our extensive experimental results show that the proposed scheme outperforms the peer scheme and can successfully identify intentional tampering and incidental modification, and localize maliciously tampered regions.

关键词： Authentication Watermarking transform coding Image coding Discrete wavelet transforms Robustness Image edge detection Wavelet domain Wavelet coefficients Feature extraction

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An optimal transform architecture for H.264/AVC

An optimal transform architecture for H.264/AVC

引用

International Multimedia, Signal Processing and Communication Technologies, IMPACT

作者： A. K. Prasoon K. Rajan School of Electrical Sciences Vellore of Institute of Technology Vellore India Department of Physics IISc Bangalore India

This paper presents the design of the area optimized integer two dimensional discrete cosine transform (2-D DCT) used in H.264/AVC codecs. The 2-D DCT calculation is performed by utilizing the separability property, in such a way that 2-D DCT is divided into two 1-D DCT calculation that are joined through a common memory. Due to its area optimized approach, the design will find application in mobile devices. Verilog hardware description language (HDL) in cadence environment has been used for design, compilation, simulation and synthesis of transform block in 0.18 mu TSMC technology.

关键词： Automatic voltage control Discrete cosine transforms Video compression Hardware design languages Design optimization Frequency domain analysis transform coding Image coding Two dimensional displays Floating-point arithmetic

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Spatial-temporal correlation based mode decision algorithm for H.264/AVC

Spatial-temporal correlation based mode decision algorithm f...

引用

IEEE International Symposium on Consumer Electronics (ISCE)

作者： Hiroki Kozu Hiroki Kuniyasu Tian Song Takashi Shimamoto Graduate School of Advanced Technology and Science University of Tokushima Tokushima Japan Computer Systems Engineering Institute of Technology and Science Graduate School of Engineering University of Tokushima Tokushima Japan

In this work, a fast mode decision algorithm for H.264/AVC is proposed. H.264/AVC achieves high coding efficiency by introducing rate-distortion optimized (RDO) method. However, it induced very high computation complexity. In order to reduce the computation complexity of the encoder of H.264/AVC, the proposed algorithm efficiently reduces the candidate modes. The proposed algorithm includes an early skip mode decision method and an adaptive rate distortion cost threshold for early INTER mode decision. An complexity reduction algorithm for INTRA modes which uses the information during INTER mode selection is also proposed. The experimental results show that compared with full-search algorithm the proposed algorithm can achieve up to 70-89% speed up with very slight PSNR loss.

关键词： Automatic voltage control Rate-distortion Cities and towns Costs Video coding IEC standards ISO standards transform coding Encoding Consumer electronics

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Reducing Leakage Power of JPEG Image on Asymmetric SRAM

Reducing Leakage Power of JPEG Image on Asymmetric SRAM

引用

IEEE International Conference on Computational Science and Engineering, CSE

作者： Yu-Hsun Lin Xuan-Yi Lin Yeh-Ching Chung Department of Computer Science National Tsing Hua University Hsinchu Taiwan

Leakage power becomes a key challenge and occupies an increasing portion of the total power consumption in nano-scale circuit design. There are many novel cache designs to reduce the leakage power based on the characteristics of programs. One of them is Asymmetric SRAM that can reduce leakage power on cache while storing bit "0". In this paper, we propose two algorithms, value-position-switch algorithm and code-bit-switch algorithm, to make the JPEG image bias on bit "0" based on Asymmetric SRAM. The value-position-switch algorithm and codebit-switch algorithm can reduce the amount of bit "1" in Huffman coded data up to 7.33% and 25.20%, respectively. The overheads of instruction count, cycle count and power consumption for these two algorithms are negligible (< 0.3%). To the best of our knowledge, this paper is the first study to reduce leakage power in application-level by utilizing the feature of Asymmetric SRAM.

关键词： Random access memory Image coding transform coding Energy consumption Circuits Software design Logic gates Program processors Decoding Huffman coding

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Distributed Block-Dependent Watermarking Method for JPEG2000 Image Authentication

Distributed Block-Dependent Watermarking Method for JPEG2000...

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International Workshop on Database Technology and Applications

作者： Shewen Sun Zhaohong Li School of Mechanical and Electrical Information Engineering Beijing Polytechnic College Beijing China School of Mechanical and Electrical Information Engineering China University of Mining and Technology Beijing China School of Mechanical and Electrical Information Engineering Beijing Jiaotong University Beijing China

Two essential benefits, the resistance to the counterfeiting attack and the tamper localization accuracy, of the fragile watermarking methods are mutually restricted. In this paper, a novel distributed block-dependent watermarking method is proposed to gain both benefits by inserting the block watermark into other chosen blocks. Further, the proposed method can be easily implemented in the DWT domain for authenticating JPEG2000 images. Experimental results show that the method can resist the counterfeiting attack effectively as other block-dependent watermarking methods, while sustain the high localization accuracy as the block-independent watermarking method. It is also demonstrated that the proposed method can successfully authenticate the JPEG2000 images while recognize the malicious tampers, such as crop-and-replacement, deletion, and so on.

关键词： Watermarking Authentication transform coding Counterfeiting Discrete wavelet transforms Image coding Data engineering Electronic mail Image recognition Distributed databases

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A comparison study between spiral and traditional fractal image compression

A comparison study between spiral and traditional fractal im...

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International Conference on Computer Engineering and Systems

作者： A. Selim M. M. Hadhoud Omar M. Salem ERTU Egypt Department of Information Technology Faculty of Computers and Information Menoufia University Shibin El Kom Egypt Department of Electronics and Electrical Communications Faculty of Electronic Engineering Menoufia University Menoufia Egypt

ISBN: (纸本)9781424458424

In this paper, we study the affect of using the spiral architecture instead of the square block decomposition and in fractal compression. Comparisons with other systems like the conventional square and the simplified fractal compression systems are presented. A comparison with standard JPEG system is also introduced. We applied these types of fractal compression on a video sequence. We found that in the case of using the spiral architecture in fractal compression, the produced or decoded image or video has a better visual quality than that produced with the conventional square system and the previously proposed simplified system. We found also that all types of fractal compression are better than the JPEG standard.

关键词： Spirals Fractals Image coding Video compression transform coding Decoding Pixel Information technology Electronic mail Computer architecture

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Fast mode decision for P-Slices in H.264/AVC based on probabilistic learning

Fast mode decision for P-Slices in H.264/AVC based on probab...

引用

International Conference on Advanced Communication Technology (ICACT)

作者： Xinxin Zhou Chun Yuan Chunhua Li Yuzhuo Zhong Division of Information Technology Graduate School at Shenzhen Tsinghua University Shenzhen China

In this paper, a fast mode decision algorithm for P-Slices in H.264/AVC is proposed. The algorithm is based on probabilistic learning. Spatial correlation between neighboring macroblocks is exploited by a Bayesian classifier to predict the best candidate mode for the current macroblock. Early termination strategy is also designed for skipping unnecessary mode checking. Extensive experiments show that the proposed algorithm can achieve 60%-70% encoding time reduction compared to JM10.0, and only yields a negligible PSNR loss and little increment in total bits and bit rates.

关键词： Automatic voltage control Video coding Encoding Video on demand Video compression IEC standards ISO standards transform coding Streaming media Computational complexity

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Interactive system design and end-to-end optimization in sensor networks

Interactive system design and end-to-end optimization in sen...

引用

International Workshop on Wearable Micro and Nano Technologies for Personalized Health (pHealth)

作者： Knut Grythe Arne Lie Ilangko Balasingham Department of Communication Systems SINTEF ICT Norway Interventional Centre Rikshospitalet University Hospital Norway Department of Electronics and Telecommunications Norwegian University of Science and Technology Norway

This paper proposes an application oriented four layered quality of service (QoS) stack for wireless sensor networks (WSN), including a supporting system architecture for interacting with WSNs using the MPEG-21 multimedia framework in an medical application setting. The application of the WSNs is signal processing algorithms reporting elaborated observed sensor data to external users. The QoS model supports the tradeoff between end-users expected QoS combined with optimized energy consumption. The MPEG-21 standard is chosen as the media resource framework due to the fact that future hospitals will have networks comprising WSNs supporting an always increasing amount of both low rate medical sensor data as well as high rate audiovisual content. Furthermore due to the heterogeneous set of user terminals and network resources, media adaptation will become important to provide reliable and robust quality of service. In this paper, we argue for an extension of the MPEG-21 terminology for use in biomedical wireless sensor networks and incorporate the requirements needed for medical applications.

关键词： Quality of service Wireless sensor networks transform coding Media Signal processing algorithms Degradation Wireless communication

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No-reference quality assessment of wavelet-compressed images

No-reference quality assessment of wavelet-compressed images

引用

Eurocon

作者： Denis A. Zaramensky Andrey L. Priorov Vladimir A. Bekrenev Vladimir E. Soloviev Laboratory of Digital Circuits and Signals physics faculty Yaroslavl State University Russia

Measurement of image and video quality is crucial for many image-processing algorithms, such as acquisition, compression, restoration, enhancement and reproduction. In this paper a no-reference quality assessment algorithm for JPEG2000 images is analyzed. This algorithm uses the changes in image statistical model due to wavelet coefficient quantization. We calculate suboptimal parameters of the algorithm and provide comparison between no-reference algorithm and two full-reference methods: peak signal to noise ratio (PSNR) and structural similarity index (SSIM). Examples of images quality assessment are provided.

关键词： Quality assessment PSNR Video compression Image coding Image restoration Signal restoration transform coding Image analysis Algorithm design and analysis Wavelet coefficients

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