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检索条件"主题词=transform coding"

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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 ...

引用

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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Analysis of Facebook steganographic capabilities

Analysis of Facebook steganographic capabilities

引用

International Conference on Computing, Networking and Communications (ICNC)

作者： Nathaniel D. Amsden Lei Chen Department of Computer Science Sam Houston State University Huntsville TX

The massive information-sharing capabilities and global reach of Facebook are of great interest to organizations of all types, including those with malicious and/or illegal intents. Our main findings in this research include the following. Steganography can be employed to send covert information via Facebook photos and potentially videos as well. Facebook Cover Photos can effectively utilize steganography, of at least 15.75% capacity using DCT coefficient embedding algorithms. Network traffic analysis determined no distinguishable differences between network traffic patterns of normal images and cover photos as they were uploaded to the Facebook servers. Firewall rules can be written to block all image uploads to Facebook.

关键词： Facebook Videos Image coding transform coding Telecommunication traffic Quantization (signal) Security

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A real time video aggregation over ATM

A real time video aggregation over ATM

引用

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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JPEG decoding via two-dimensional optimal separable filters

JPEG decoding via two-dimensional optimal separable filters

引用

IEEE International Conference on Image Processing

作者： G. Calvagno G.A. Mian R. Rinaldo Dipartimento di Elettronica e Informatica Università di Padova Padova Italy

In a JPEG decoder, the quantized discrete cosine transform (DCT) coefficient blocks are usually processed using the inverse DCT to reconstruct an approximation of the original image. In the presence of quantization of the transform coefficients, the use of the inverse DCT in the decoder is not the best choice: We propose a procedure to design a family of separable 2D synthesis filters that minimize the reconstruction error power and these filters are used in the decoder instead of the inverse DCT. The appropriate reconstruction filters are selected on the basis of the standard quantization information provided in the JPEG bit stream. We show that the proposed decoding method gives some gain with respect to the standard decoder, making use of only the information provided by the JPEG bit stream.

关键词： Decoding Image reconstruction Quantization Discrete cosine transforms Filter bank transform coding Streaming media Signal synthesis Image coding Signal analysis

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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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Modelling of visual feature derivation in the VizIR framework

Modelling of visual feature derivation in the VizIR framewor...

引用

European Signal Processing Conference (EUSIPCO)

作者： Horst Eidenberger Institute of Software Technology and Interactive Systems Vienna University of Technology Wien Austria (Europe)

If visual information retrieval should make further progress, it will be necessary to identify new ways to derive visual properties from higher levels of understanding than the pixel level (e.g. from low-level features). The paper outlines the implementation of modelling of feature hierarchies in the visual information retrieval framework VizIR (free under GPL). The approach allows for the derivation of high-level features from low-level features by aggregation and localisation as well as semantic enrichment with additional knowledge. The technical implementation is based on the MPEG-7 structures for aggregation and specialisation.

关键词： Visualization Abstracts Media Semantics transform coding

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An approach for an efficient sharing of IP as a Service in cloud FPGA

An approach for an efficient sharing of IP as a Service in c...

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IEEE SSD International Multi-Conference on Systems, Signals and Devices

作者： Rym Skhiri Virginie Fresse Jihene Malek Benoit Suffran Jean Paul Jamont Electronics and Microelectronics Lab Faculty of Science University of Monastir Monastir Tunisia Jean Monnet University University of Lyon Hubert Curien Lab UMR CNRS 5516 Saint-Etienne France Electronics and Microelectronics Lab Higher Institute of Applied Science and Technology Sousse University Tunisia STMicroelectronics Grenoble France LCIS Lab Univ. Grenoble Alpes Valence France

Using FPGAs in the cloud has rapidly and significantly increased over the last few years. FPGA devices can be either integrated to support the cloud infrastructure or used as a computing resources. FPGA are available as a computing resources for enabling the designers to accelerate their applications. Putting FPGA environment in the cloud called FPGA as a service, have proposed different services. These existing services cannot solve all challenges. In this paper, we propose a new service called Intellectual Property (IP) as a Service trying to resolve the unsolved challenges. This service will allow easily and Quickly exploit and share IP in the cloud.

关键词： Platform as a service transform coding Intellectual property Tools Design tools Field programmable gate arrays Hardware acceleration

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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...

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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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One software solution for processing WebVTT subtitles during playback of hls streams using FFmpeg libraries

One software solution for processing WebVTT subtitles during...

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Telecommunications Forum (TELFOR)

作者： Rade Vulin Tatjana Samardžić Đorđe Simić Branimir Kovačević Istraživačko-razvojni Institut RT-RK Novi Sad Narodnog fronta 23a 21000 Novi Sad Srbija Istraživačko-razvojni Institut Novi Sad Narodnog fronta 23a 21000 Novi Sad Srbija

Paper presents one implementation of software solution for processing WebVTT subtitles during playback of HLS streams. Software solution is created by using the functionality of the FFmpeg library. Result of using created software solution on HLS streams is creation of overall transport stream, which contains video, audio and subtitle components. In this way successful playback of audio, video and subtitle is enabled.

关键词： Streaming media Standards Electronic mail transform coding Software Protocols Linux

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