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International Conference on E-Business and E-Government (ICEE)

作者： Zhu Huaihong Tian Li Ma Jingwen Wei Yongzhuang Sun Tie Jinling College Nanjing University Nanjing Jiangsu 210093 China Department of Computer Science and Technology Nanjing University Nanjing Jiangsu 210093 China

ISBN: (纸本)9781424486915

This paper proposes a improved algorithm to embed and detect the digital watermark in digital image. And it uses a highly efficient and practical programming tool MATLAB to achieve a block-based on DCT domain digital watermark embedding and extraction validated. First, transform the watermark information into a binary string, with dual unrelated normal pseudo random sequence of real numbers representing the 0 and 1 of the watermark information embedded in the image of the DCT middle frequency coefficients. After these attacks based detection of correlation matrix to extract the correct watermark. Demonstrate the robustness and invisibility. Propose some improvement methods.

关键词： Discrete cosine transforms Watermarking MATLAB Digital images transform coding Correlation Algorithm design and analysis

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Image authentication technology based on semi-fragile scrambling watermarking

Image authentication technology based on semi-fragile scramb...

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International Conference on Computer Science and Service System (CSSS)

作者： Zhirong Gao Jin Lü Department of Computer Science South Central University of Nationalities Wuhan China

ISBN: (纸本)9781424497621

In order to distinguish the conventional image manipulation and malicious tampering more effectively , this paper implements an image authentication algorithm based on semi-fragile scrambling watermarking. The original image is firstly decomposed into pixel-based bit-planes, then the Arnold scrambled binary watermarking is embedded as a mask information into a particular bit-plane of original image. In the image detection side, the extracted watermarking is combined with a tamper assessment function to determine the credibility of image authentication. Experimental results show that the algorithm is robust to several conventional image manipulation like brightness adjusted, JPEG compression, salt and pepper noise ,and median filtering ,and which is simultaneously fragile to malicious tampering .The position of malicious tampering can be localized accurately.

关键词： Watermarking transform coding Authentication PSNR Robustness Classification algorithms Discrete cosine transforms

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Accelerating the Media Business with MPEG Extensible Middleware

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IEEE MULTIMEDIA 2010年第3期17卷 74-78页

作者： Timmerer, Christian Chiariglione, Filippo Preda, Marius Rodriguez Doncel, Victor Klagenfurt Univ Vienna Austria Univ Politecn Cataluna E-08028 Barcelona Spain

The development of successful multimedia applications is becoming a challenging task due to short deployment cycles and the huge amount of applications flooding the market. One major problem that the multimedia industry is facing in this area is the heterogeneity of the content-delivery chain. The classic model in which all the components, such as the authoring, distribution, and playback, were known in advance, has now evolved into an interconnected network of programmable processing units that are no longer dedicated and built for one purpose.

关键词： Interconnected Systems Middleware Multimedia Computing Multimedia Market Content Delivery Chain Interconnected Network Programmable Processing Unit Engines transform coding Protocols Media Middleware Computer Architecture Licenses

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A universal steganalysis to steganographic images on frequency domain

A universal steganalysis to steganographic images on frequen...

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International Conference on E-Business and E-Government (ICEE)

作者： Qian Ping Chen Li-ya Wu Meng College of Computer Science Jiangsu University of Science and Technology Zhenjiang China College of Computer Science Nanjing University of Posts and Telecommunications Nanjing China Department of Electronic Engineering Shanghai Jiaotong University Shanghai China Telecommunications and Information Engineering Nanjing University of Posts and Telecommunications Nanjing China

ISBN: (纸本)9781424486915

Current steganalysis for images is not universal, which is usually special for one kind of steganography and not practical for others. Meanwhile the correct detection rate of these detecting methods is not high. After analyzing current steganalysis methods, a new steganalysis method for detection of steganography in image's frequency domain is proposed. The detecting method is universal and is not restrained to some special steganography method. Based on the spectrum analysis of difference histogram of frequency coefficients, the detection is achieved according to evident spectrum difference between non-steg-images and steg-images. The physical frame of the algorithm is easy and the detection method can be put into practice. Experimental results from detecting steganographic images of DCT domain and DWT domain show that the detection performance is satisfying. Compared to Stegdetect 0.6, which is a steganalysis system for JPEG images, the method shows much better performance.

关键词： Histograms Educational institutions Frequency domain analysis Computers transform coding Discrete cosine transforms Conferences

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BilVideo-7: An MPEG-7-Compatible Video Indexing and Retrieval System

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IEEE MULTIMEDIA 2010年第3期17卷 62-73页

作者： Bastan, Muhammet Cam, Hayati Gudukbay, Ugur Ulusoy, Ozgur Bilkent Univ Dept Comp Engn Ankara Turkey

BilVideo-7 is an MPEG-7-compatible, distributed, video indexing and retrieval system that supports complex multimodal queries in a unified framework.

关键词： Content Based Retrieval Database Indexing Multimedia Databases Query Formulation Video Databases Video Retrieval Bil Video 7 MPEG 7 Video Indexing System Video Retrieval System Prototype Multimedia Database Management Systems Query By Example User Queries Query By Keyword Multimedia Content Search Semantic Concepts transform coding Semantics Multimedia Communication Visualization XML Image Color Analysis Shape

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transform audio coding with arithmetic-coded scalar quantization and model-based bit allocation

Transform audio coding with arithmetic-coded scalar quantiza...

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32nd IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Oger, Marie Ragot, Stephane Antonini, Marc France Telecom R&D TECH SSTP Av Pierre Marzin F-22307 Lannion France Univ Nice Sophia Antipolis F-06903 Sophia Antipolis France CNRS UMR 6070 Lab I3S F-06903 Sophia Antipolis France

ISBN: (纸本)1424407281

In this paper we present a new model-based method to code the transform coefficients of audio signals. The histogram of transform coefficients is approximated by a generalized Gaussian model for efficient model-based bit allocation and the spectrum is coded by scalar quantization followed by arithmetic coding. An example coder operating at 16 kHz and using predictive modified discrete cosine transform (MDCT) coding is described. We compare the performance of the proposed coder with ITU-T G.722.1. Objective and subjective quality results are presented. The proposed coder is better than ITU-T G.722.1 at 24 kbit/s and equivalent at 32 kbit/s.

关键词： transform coding audio coding modeling

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Scalable Interconnect Networks for Discrete Cosine transforms (DCT) for Mobile and Multimedia Application

Scalable Interconnect Networks for Discrete Cosine Transform...

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53rd Midwest Symposium on Circuits and Systems (MWSCAS 2010)

作者： Hussein, Adel Suleiman, Adnan Kerkiz, Nabil Akopian, David Fahad Bin Sultan Univ FBSU Dept Elect Engn Tabuk Saudi Arabia Univ Texas San Antonio Dept Elect & Comp Engn San Antonio TX USA

ISBN: (纸本)9781424477739

Scalable architectures were proposed for Discrete Cosine transform (DCT). Number of processing elements (PE) can be reduced significantly using partial column structure for computing the DCT transform. This feature is very desirable for multimedia applications usage in handheld devices. As per transform computation, data reordering is required between stages (columns) where intermediate computed values are saved in memory-like temporary locations called FIFO's. A scalable interconnect network for both global and local data reordering and its implementation is presented in this paper. Scalability is based on transform size and desired number of processing elements (PE). The structure gives choice flexibility of throughput vs. complexity (cost and area.) of the overall system.

关键词： DCT Scalable architecture permutation transform coding

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An Adaptive LogLuv transform for High Dynamic Range Video Compression

An Adaptive LogLuv Transform for High Dynamic Range Video Co...

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IEEE International Conference on Image Processing

作者： Motra, Ajit Thoma, Herbert Fraunhofer IIS D-91058 Erlangen Germany

ISBN: (纸本)9781424479948

High Dynamic Range (HDR) imaging represents a wide range of intensity levels found in real scenes ranging from direct sunlight to shadows. However, raw HDR sequences require very huge memory space for storage. In this work, we present an approach of how an existing encoder can be used for encoding HDR video sequence with our proposed adaptive LogLuv transform. The proposed method shows considerable improvement when compared with non-adaptive LogLuv transform.

关键词： HDR video sequence adaptive LogLuv transform adaptive codes data compression high dynamic range imaging high dynamic range video compression transform coding video coding

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LOW-COMPLEXITY LOSSY COMPRESSION OF HYPERSPECTRAL IMAGES VIA INFORMED QUANTIZATION

LOW-COMPLEXITY LOSSY COMPRESSION OF HYPERSPECTRAL IMAGES VIA...

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IEEE International Conference on Image Processing

作者： Abrardo, Andrea Barni, Mauro Magli, Enrico Univ Siena Dipartimento Ingn Informaz I-53100 Siena Italy Politecn Torino Dipartimento Elettr Turin Italy

ISBN: (纸本)9781424479948

Lossy compression of hyperspectral and ultraspectral images is traditionally performed using 3D transform coding. This approach yields good performance, but the complexity and memory requirements make it unsuitable for onboard compression. In this paper we propose a low-complexity lossy compression scheme based on prediction, quantization and rate-distortion optimization. The scheme employs coset codes coupled with the new concept of "informed quantization", and requires no entropy coding. The performance of the resulting algorithm is competitive with that of state-of-the-art 3D transform coding schemes, but the complexity is immensely lower, making it suitable for onboard compression at high throughputs.

关键词： 3D transform coding data compression entropy coding geophysical image processing hyperspectral images image coding informed quantization lossy compression optimisation quantisation (signal) rate distortion theory rate-distortion optimization transform coding ultraspectral images

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On the Optimization of Degree Distributions in LT Code with Covariance Matrix Adaptation Evolution Strategy

On the Optimization of Degree Distributions in LT Code with ...

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2010 IEEE World Congress on Computational Intelligence

作者： Chen, Chih-Ming Chen, Ying-ping Shen, Tzu-Ching Zao, John K. Natl Chiao Tung Univ Dept Comp Sci Hsinchu Taiwan

ISBN: (纸本)9781424481262

Luby transform code (LT code) has been a popular and practical technique in the field of channel coding since its proposal. One of the key components of LT code is a degree distribution which is used to determine the relationship between source data and codewords. Luby in his proposal suggested two general methods to construct feasible degree distributions. Such general designs work appropriately in typical situations but not optimally in most cases. To explore the full potential of LT code, in this work, we make the first attempt to introduce evolutionary algorithms to optimize the degree distribution in LT code. Degree distributions are encoded as real-valued vectors and evaluated by numerical simulation of LT code. For applications of different natures, two objectives are implemented to search good degree distributions with different decoding behavior. Compared with the original design, the experimental results are quite promising and demonstrate that the degree distribution can be customized for different purposes. In addition to manually adjusting the degree distribution as the common practice, the work presented in this paper provides an efficient alternative approach to use and adapt LT code for both practitioners and researchers.

关键词： LT code Luby transform code channel coding codes covariance matrices covariance matrix adaptation evolution degree distributions evolutionary algorithms evolutionary computation optimization transform coding

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