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检索条件"主题词=transform coding"

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Nonlinear transform coding: polar coordinates revisited

Nonlinear transform coding: polar coordinates revisited

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Data Compression Conference (DCC)

作者： D.E. Ba V.K. Goyal Massachusetts Institute of Technology USA

Summary form only given. We designed a family of integer-to-integer (i2i) approximations to the Cartesian-to-polar transformation and analyzed its behavior for high-rate transform coding. Denoting (ordinary, continuous) polar coordinates by (r, 0), our precise high-rate analysis relates the performance to the differential entropies of r 2 and 0, which are often easy to evaluate. One may thus predict when there is an improvement over linear transform coding. The analysis matches our simulations for coding of Gaussian scale mixtures and other polar-separable sources. The advantage over the best linear transform coder can be large. Our hope is to extend the polar-coordinate results to a general theory for nonlinear transform coding based on i2i implementations of arbitrary nonlinear transformations

关键词： transform coding Discrete transforms Quantization Entropy coding Shape Video coding Nonlinear distortion Rate distortion theory Hypercubes Linear approximation

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Serially Concatenated Luby transform coding and Bit-Interleaved Coded Modulation Using Iteratlive Decoding for the Wireless Internet

Serially Concatenated Luby Transform Coding and Bit-Interlea...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： R.Y.S. Tee T.D. Nguyen L.L. Yang L. Hanzo School of ECS University of Southampton UK

In bit-interleaved coded modulation (BICM) the coding and modulation schemes were jointly optimized for the sake of attaining the best possible performance when communicating over fading wireless communication channels. The iterative decoding scheme of BICM (BICM-ID) invoking an appropriate bit-to-symbol mapping strategy enhances its achievable performance in both AWGN and Rayleigh channels. BICM-ID may be conveniently combined with Luby transform (LT) codes, which were designed for handling packetized wireless Internet data traffic in erasure channels without retransmitting the corrupted packets. By jointly designing a serially concatenated LT-BICM-ID code, an infinitesimally low bit error rate (BER) is achieved for signal to noise ratios (SNR) in excess of 7.5 dB over wireless Internet type erasure channels contaminated by AWGN

关键词： Concatenated codes transform coding Interleaved codes Modulation coding Iterative decoding Internet Rayleigh channels AWGN Bit error rate Signal to noise ratio

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Accelerated parallel imaging by transform coding data compression with k-t SENSE

Accelerated parallel imaging by transform coding data compre...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Jeffrey Tsao Michael S. Hansen Sebastian Kozerke Central Technologies Novartis Institutes of BioMedical Research Inc. Cambridge MA USA Cardiothoracic Unit UCL Institute of Child Health Great Ormond Street Hospital London UK Institute for Biomedical Engineering University and Swiss Federal Institute of Technology Zurich Switzerland

The theory and implementation of the k-t approach (k-t BLAST and k-t SENSE) are reviewed in the context of transform coding. The k-t approach exploits the information redundancy in typical time series of magnetic resonance images that depict anatomy and/or functional parameters. By utilizing this redundancy, it opens up the opportunity for significant acceleration, which in turn allows for scan time reduction, improvements in spatial or temporal resolution, or extended volume coverage for a given acquisition time

关键词： Acceleration transform coding Data compression Magnetic resonance imaging Training data Image reconstruction Image coding USA Councils Spatiotemporal phenomena Coils

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Real-time hyperspectral image cube compression combining adaptive classification and partial transform coding

Real-time hyperspectral image cube compression combining ada...

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International Conference on Signal Processing Proceedings (ICSP)

作者： Zheng Zhou Jian Liu Jinwen Tian Huazhong University of Science and Technology Wuhan China

In using partial transform for the coding of hyperspectral image, it must consider spectral decorrelation between image components, issues that a combined adaptive classification and partial transform algorithm for hyperspectral image compression is presented in this paper. Our method uses a linear prediction based on adaptive classification to decorrelate the spectrum redundancy and a 2D integer reversible DCT-based scheme as spatial compression engine. The classification includes band ordering, band regrouping and reference frame selection. Experimental results on AVIRIS data indicate that the proposed approach is a novel low complexity lossy hyperspectral image compression scheme and exhibits performance better than other comparative methods in quality and fidelity. It can be used for hyperspectral image compression in the embedded processor of the platform on satellite or aircraft

关键词： Hyperspectral imaging Image coding transform coding Hyperspectral sensors Decorrelation Principal component analysis Independent component analysis Satellites Remote sensing Karhunen-Loeve transforms

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A Hybrid transform coding for Video Codec

A Hybrid Transform Coding for Video Codec

引用

International Conference on Information Technology (ICIT)

作者： M. Ezhilarasan P. Thambidurai Department of Computer Science & Engineering and Information Technology Pondicherry Engineering College Puducherry India

This paper proposes a hybrid transform coding technique, where the intraframes of video sequence are coded by discrete wavelet transform and the interframes are coded with discrete cosine transform technique. It also proposes the selection of sequence of frames predicted from the reference intraframes. This proposal consistently minimizes the prediction error for the predicted frame for further processing. The experimental results show that the proposed hybrid transformation coding technique outperforms over conventional transformation coding technique in terms of encoding time and prediction errors.

关键词： transform coding Video codecs Discrete cosine transforms Discrete wavelet transforms Video coding Image coding Frequency Wavelet transforms Bit rate Decorrelation

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Low-Power Bus transform coding for Multilevel Signals

Low-Power Bus Transform Coding for Multilevel Signals

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IEEE Asia-Pacific Conference on Circuits and Systems

作者： Fakhrul Zaman Rokhani Gerald E. Sobelman Department of Electrical and Computer Engineering University of Minnesota Minneapolis MN USA

This paper proposed a novel extension of bus-invert coding to handle 4-level pulse amplitude modulated (PAM-4) signals. A generalized mathematical model for energy consumption and energy dissipation for PAM-4 signals is presented and a family of coding schemes are developed that can reduce the average power consumption and dissipation by up to 54% compared to un-coded PAM-4 buses. This technique is attractive for high-speed data transmission systems that employ PAM-4 signals on general high capacitance buses such as global wires, off-chip buses, I/O and backplanes

关键词： transform coding Pulse modulation Energy consumption Amplitude modulation Modulation coding Mathematical model Energy dissipation Data communication Capacitance Wires

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MATHEMATICAL ANALYSIS OF THE ENERGY COMPACTION AFFECTED BY THE DIMENSIONALITY OF KARHUNEN-LOEVE transform

MATHEMATICAL ANALYSIS OF THE ENERGY COMPACTION AFFECTED BY T...

引用

16th IEEE International Conference on Image Processing

作者： Bandoh, Yukihiro Ohbayashi, Hiroki Takamura, Seishi Kamikura, Kazuto Yashima, Yoshiyuki NTT Co NTT Cyber Space Labs 1-1 Hikari No Oka Kanagawa 2390847 Japan Kyushu Univ Fac Sci Higashiosaka Osaka 8128581 Japan

ISBN: (纸本)9781424456536

transform coding is a essential tool for picture coding applications, and coding schemes that can achieve high energy compaction are essential. In terms of energy compaction, Karhunen-Loeve transform (KLT) is known to be optimal. The energy compaction provided by KLT depends on the statistical property of the input signal and the dimensionality of KLT. However, the quantitative effect of KLT dimensionality on energy compaction has not been clarified. This paper establishes a mathematical model of the relationship among the dimensionality of KLT and the energy compaction of the transform coefficients, using mathematical tools in quantum information theory.

关键词： Video coding transform coding

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ON THE METHOD OF MULTICOPY VIDEO ENHANCEMENT IN transform DOMAIN

ON THE METHOD OF MULTICOPY VIDEO ENHANCEMENT IN TRANSFORM DO...

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16th IEEE International Conference on Image Processing

作者： Nguyen, Viet Anh Tan, Yap-Peng Chen, Zhenzhong Nanyang Technol Univ Sch Elect & Elect Engn Singapore Singapore

ISBN: (纸本)9781424456536

Increasingly, we can obtain more than one compressed copy of the same video content with different levels of visual quality over the Internet. As the original source video is not always available, how to choose or derive a video of the best quality from these copies becomes a challenging and interesting problem. In this paper, we address this new research problem by blindly enhancing the quality of the video reconstructed from multiple compressed copies of the same video content. The aim is to reconstruct a video that achieves better quality than any of the available copies. Specifically, we propose to reconstruct each coefficient of the video in the transform domain by using a narrow quantization constraint set derived from the multiple compressed copies together with the Cauchy distribution model for each AC transform coefficient to minimize the distortion. Analytical and experimental results show the effectiveness of the proposed method.

关键词： Blind video enhancement multiple copies quantization constraint set transform coding

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COMPRESSION OF IMAGE PATCHES FOR LOCAL FEATURE EXTRACTION

COMPRESSION OF IMAGE PATCHES FOR LOCAL FEATURE EXTRACTION

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IEEE International Conference on Acoustics, Speech and Signal Processing

作者： Makar, Mina Chang, Chuo-Ling Chen, David Tsai, Sam S. Girod, Bernd Stanford Univ Dept Elect Engn Informat Syst Lab Stanford CA 94305 USA

ISBN: (纸本)9781424423538

Local features are widely used for content-based image retrieval and object recognition. We present an efficient method for encoding digital images suitable for local feature extraction. First, we find the patches in the image corresponding to the detected features. Then, we extract these patches at their characteristic scale and orientation and encode them for efficient transmission. A Discrete Cosine transform (DCT) with adaptive block size is used for patch compression. We compare this method to directly compressing feature descriptors using transform coding. Experimental results show the superior performance of our technique. Image patches can be compressed to rates around 55 bits/patch (18x compression relative to uncompressed SIFT feature descriptors) and still achieve good image matching performance.

关键词： Image compression image matching feature descriptors transform coding

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Steganalysis for JPEG Images Based on Manifold Learning

Steganalysis for JPEG Images Based on Manifold Learning

引用

2nd International Conference on the Applications of Digital Information and Web Technologies

作者： Quan, Xiaomei Zhang, Hongbin Beijing Univ Technol Coll Comp Sci Beijing Peoples R China

ISBN: (纸本)9781424444564

Most current steganalysis schemes are based on the Cachin's statistical undetectability. However, the lack of the statistical model for the natural images the performance of the current steganalyzers. In this paper, we propose a novel steganalyzer for JPEG images based on manifold learning, which overcomes the statistical steganalyzer's deficiencies. The feature extraction in this steganalyzer is completed by the nonlinear dimensionality reduction method (ISOMAP), which will greatly reduce the dimensionality of the feature space without influencing the performance of our steganalyzer. Experimental results show the effectiveness of this method and also demonstrate the promise of the proposed scheme used both as a specific and a blind steganalyzer.

关键词： Steganography Discrete cosine transforms Histograms Testing transform coding Feature extraction Art Security Statistical analysis Statistics

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