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检索条件"主题词=transform coding"

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An SVD-based watermarking method for image content authentication with improved security

An SVD-based watermarking method for image content authentic...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Seungiae Lee Dalwon Jang C.D. Yoo Digital Contents Research Division Electronics and Telecommunications Research Institute Daejeon South Korea Department of EECS Division of EE KAIST Daejeon South Korea

ISBN: (纸本)0780388747

For image content authentication, a secure watermarking method using quantization-based embedding on the largest singular value (SV) is proposed. The block-wise quantization-based embedding can be vulnerable to vector quantization (VQ) attack and attacks associated with histogram analysis. To overcome these security problems, the proposed method places interdependency among image blocks and dithers the quantized value. By adjusting the threshold of the detector, a trade-off between the robustness to JPEG compression and the probability of misdetection can be made. The proposed method can detect a tampered area with high sensitivity. This is confirmed by experimental results and security analysis.

关键词： Watermarking Authentication Histograms Security Discrete cosine transforms Discrete wavelet transforms Robustness transform coding Image coding Internet

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An empirical study of secure MPEG video transmissions

An empirical study of secure MPEG video transmissions

引用

Network and Distributed System Security

作者： I. Agi L. Gong Computer Science Laboratory SRI International Inc. Menlo Park CA USA

MPEG (Moving Pictures Expert Group) is an industrial standard for video processing and is widely used in multimedia applications in the Internet. However, no security provision is specified in the standard. We conducted an experimental study of previously proposed selective encryption schemes for MPEG video security. This study showed that these methods are inadequate for sensitive applications. We discuss the tradeoffs between levels of security and computational and compression efficiency.

关键词： Cryptography transform coding Video sequences Streaming media Security Encoding Video compression Decoding MPEG standards Application software

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SVBS: a high-resolution medical image compression algorithm using slicing with variable block size segmentation

SVBS: a high-resolution medical image compression algorithm ...

引用

International Conference on Pattern Recognition

作者： K.R. Namuduri N. Ranganathan H. Rashedi GTE Telecommunication Services Inc. Tampa FL USA Center for Microelectronics Research University of South Florida Tampa FL USA

Medical images such as mammograms and chest X-rays require resolution of the the order of 4096/spl times/4096 pixels with 10 to 16 bits per pixel. Because of the poor visualization and extreme sensitive nature of the information content, any information loss in storage and retrieval of medical information may not be acceptable. In this paper, an efficient lossless image compression scheme is proposed for high resolution medical images. The proposed method is based on two concepts: multibit plane slicing and variable block segmentation. It exploits the two basic image characteristics smoothness and similarity to achieve high compression efficiency. The proposed algorithm is applied to 12 and 16 bit mammogram images. The compression efficiency of the proposed algorithm is better than that obtained by other lossless compression schemes including the scheme based on the JPEG standard.

关键词： Biomedical imaging Image coding Image resolution Pixel X-rays Visualization Information retrieval Content based retrieval Image segmentation transform coding

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JPEG2000 and JPEG: image quality measures of compressed medical images

JPEG2000 and JPEG: image quality measures of compressed medi...

引用

National Conference on Telecommunication Technology (NCTT)

作者： T.H. Oh R. Besar Faculty of Engineering and Technology Multimedia University Malacca Malaysia

Due to the constraints on bandwidth and storage capacity, medical images must be compressed before transmission and storage. However, when the image is compressed, especially at lower bit rates, the image fidelity is reduced, a situation which cannot be tolerated in the medical field. The paper studies the compression performance of the new JPEG2000 and the more conventional JPEG standards. The parameters compared include the compression efficiency, peak signal-to-noise ratio (PSNR), picture quality scale (PQS), and mean opinion score (MOS). Three types of medical images are used - X-ray, magnetic resonance imaging (MRI) and ultrasound. Overall, the study shows that JPEG2000 compression is more acceptable than, and superior to, JPEG in lossy compression.

关键词： transform coding Image quality Image coding Biomedical imaging Image storage PSNR Magnetic resonance imaging Magnetic field measurement Bandwidth Bit rate

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A model for JPEG quantization

A model for JPEG quantization

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International Symposium on Speech, Image Processing and Neural Networks

作者： B.G. Sherlock A. Nagpal D.M. Monro Department of Electrical Engineering Parks College of Saint Louis University Cahokia IL USA School of Electronic and Electrical Engineering University of Bath Bath UK

Presents a strategy for generating optimal JPEG quantization tables to approximate a target compression ratio. This uses a model to express the quantization coefficients as functions of compression ratio and their position in the quantization table. Simulated annealing of model parameters was used to find optimum models for an image which is a composite of several standard test images. Models of varying complexity with 1 to 6 parameters were optimized at three compression ratios, and a three parameter model was chosen to represent quantization tables. After further optimizations over a range of compressions, a general model was obtained by expressing each model parameter as a function of the compression. Application to three CCITT test pictures demonstrates the quality of recovered images.< >

关键词： Quantization transform coding Discrete cosine transforms Image coding Simulated annealing Testing Stochastic processes Computational modeling Cost function Educational institutions

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An embedded sinusoidal transform codec with measured phases and sampling rate scalability

An embedded sinusoidal transform codec with measured phases ...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： G. Aguilar Juin-Hwey Chen R.B. Dunn R.J. McAulay Xiaoqin Sun Wei Wang R. Zopf Speech Technology Group VoIP Access Networks Lucent InterNetworking Systems Red Bank NJ USA Massachusetts Institute of Technology Cambridge MA USA

This paper describes an embedded sinusoidal transform codec that is scalable not only in bit-rate, but also in sampling rate. In a representative implementation, the system produces an embedded bit-stream at 3.2 and 6.4 kbit/s for telephone-bandwidth speech, and scales up to 9.6 kbit/s for 16 kHz sampled wideband speech. The 3.2 kbit/s codec is a sinusoidal transform codec with synthetic phases. The 6.4 kbit/s codec adds resolution to the spectral envelope and transmits measured phases of the eight lowest harmonics. The 9.6 kbit/s codec adds information in the 4 to 8 kHz band to provide higher quality wideband speech.

关键词： Phase measurement Sampling methods Scalability Bit rate Decoding Speech codecs Bandwidth Wideband Speech coding transform coding

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An efficient architecture of multiple 8×8 transforms for H.264/AVC and VC-1 decoders

An efficient architecture of multiple 8×8 transforms for H....

引用

International Conference on Green Circuits and Systems (ICGCS)

作者： Yi-Chih Chao Shih-Tse Wei Chia-Hung Kao Bin-Da Liu Jar-Ferr Yang Department of Electrical Engineering National Cheng Kung University Tainan County Taiwan

This paper proposes an efficient architecture, which can perform multiple 8×8 transforms for both H.264/AVC and VC-1 decoders. The hardware design which supports multiple standards becomes more and more important. By designing a unique data flow for VC-1 8×8 inverse transform, the H.264/AVC and VC-1 8×8 inverse transforms are realized in a hardware sharing architecture. The proposed multiple transforms architecture contains fast one-dimensional (1-D) transforms and rounding operations. Simulation results show the proposed architecture takes 6,702 gates which are much less than the individual designs for the H.264/AVC and VC-1 8×8 inverse transforms.

关键词： Automatic voltage control Decoding Hardware Computer architecture Video compression IEC standards ISO standards transform coding Bit rate MPEG 4 Standard

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Fixed-point DSP implementation of wavelet decomposition for image processing

Fixed-point DSP implementation of wavelet decomposition for ...

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IEEE International Symposium on Signal Processing and Information Technology (ISSPIT)

作者： G. Frassi A. Bellini Dipartimento di Ingegneria dellhformazione AIDA Universitá degli Studi di Parma Parma Italy

Real time implementation of wavelet transformations is becoming of great importance, since it is one of the key elements of JPEG2000 and MPEG4 encoding operations. This paper details a dedicated wavelet decomposition implementation for ADSP-BF533 and ADSP-BF561 fixed-point DSPs, and reports experimental results on several test images.

关键词： Digital signal processing Image processing Image coding Graphical user interfaces transform coding Discrete cosine transforms MPEG 4 Standard Testing Digital images Discrete wavelet transforms

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A real time video aggregation over ATM

A real time video aggregation over ATM

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IEEE International Workshop on Factory Communication Systems (WFCS)

作者： J.M. Fornes F.R. Rubio Department Ingeniería de Sistemas y Automática Escuela Superior de Ingenieros Universidad de Sevilla Seville Spain Department Ingeniería de Sistemas y Automática Escuela Superior de Ingenieros Universidad de Sevilla Área de Automotica Seville Spain

The paper describes the implementation of a real time VAS (Video Aggregation System) on a parallel architecture based on a multiprocessor system with five C40 DSP's. Video aggregation of MPEG for a group of video sessions as a bundle is to perform compression and multiplexing of video streams before packetization (i.e. before the ATM layer). This system may be used to telesupervise factory processes when we need some video sources simultaneously.

关键词： Video compression Streaming media Production facilities Discrete cosine transforms Asynchronous transfer mode transform coding Image coding Image segmentation Bandwidth Image quality

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New paradigm for compressed image quality metric: exploring band similarity with CSF and mutual information

New paradigm for compressed image quality metric: exploring ...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Haijun Zhu Huayi Wu State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University of China Wuhan China

A new paradigm for designing compressed image quality metric is proposed in this paper, of which the most significant characteristic is the use of mutual information, a key concept in information theory which measures statistical dependence between two random variables, to exploring the degree of similarity of spatial visual information distribution across different frequency bands in image. Visual information used in the calculation of mutual information is extracted by contrast sensitivity function (CSF) and local band-limited contrast definition proposed by E. Peli. Our paradigm is more consistent with human perceptual mechanism comparing with the traditional error-summation based ones. The effectiveness of our image quality assessment paradigm is validated by JPEG & JPEG2000 compressed images at different bit rates and images with various types of noises.

关键词： Image coding Image quality Mutual information transform coding Information theory Frequency measurement Random variables Data mining Humans Bit rate

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