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检索条件"主题词=transform coding"

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Reduced memory requirements in modified JPEG2000 codec

Reduced memory requirements in modified JPEG2000 codec

引用

International Conference on Digital Signal Processing (DSP)

作者： G. Lafruit Y. Andreopoulos B. Masschelein IMEC v.z.w. DESICS Belgium Vrije Universiteit Brussel Brussels Belgium

In JPEG2000, the wavelet transformed image is subdivided into equally sized data blocks, which are independently entropy coded. It is therefore often strongly suggested that these blocks can be decoded on the instant of their creation at the encoder, making temporary memory quasi obsolete. Unfortunately, data dependencies in the forward and inverse wavelet transform prevent their complete, instantaneous creation (consumption) at the encoder (decoder), resulting in their partial, temporary storage and thus also in increased memory needs. This paper shows that the main burden is the unique, large data block size, which is used over all levels of the wavelet image. Relaxing this constraint substantially diminishes the memory needs over the full JPEG2000 codec chain.

关键词： Codecs Image coding Decoding Wavelet transforms MPEG 4 Standard Delay Filters Wavelet analysis transform coding Data processing

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Compressed-domain video watermarking of MPEG streams

Compressed-domain video watermarking of MPEG streams

引用

IEEE International Conference on Multimedia and Expo (ICME)

作者： D. Simitopoulos S.A. Tsaftaris N.V. Boulgouris M.G. Strintzis Informatics and Telematics Institute Thessaloniki Greece Electrical and Computer Engineering Dept NorthWestern University Evanston IL USA

A new technique for watermarking of MPEG compressed video streams is proposed. The watermarking scheme operates directly in the domain of MPEG program streams. Perceptual models are used during the embedding process in order to preserve the video quality. The watermark is embedded in the compressed domain and is detected without the use of the original video sequence. Experimental evaluation demonstrates that the proposed scheme is able to withstand a variety of attacks. The resulting watermarking system is fast and reliable, and is suitable for copyright protection and real-time content authentication applications.

关键词： Video compression Watermarking transform coding Streaming media Discrete cosine transforms Informatics Telematics Real time systems Authentication DVD

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Fault-Tolerant Application-Specific Network-on-Chip Design using Discrete Particle Swarm Optimization

Fault-Tolerant Application-Specific Network-on-Chip Design u...

引用

International Conference on Industrial and Information Systems, ICIIS

作者： P. Veda Bhanu J. Soumya BITS-Pilani Telangana India

ISBN: (数字)9781728137063

ISBN: (纸本)9781728137070

This paper presents a meta-heuristic based technique Discrete Particle Swarm Optimization (DPSO) to address the permanent link failures in Application-Specific Network-on-Chip (NoC) design. Application-specific NoC based designs are more flexible with the current application requirements. With the advent of technology, dense integration of components on a chip gradually degraded the reliability and system performance. Therefore, to improve the reliability and system performance in application-specific NoC design, the proposed technique places the spare links in the likelihood of link faults. Experimentations have performed for different application benchmarks to leverage the efficiency of proposed technique. The results show that overhead in communication cost over fault-free result is minimum.

关键词： Topology transform coding Fault tolerance Fault tolerant systems Particle swarm optimization Benchmark testing Conferences

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Experimental study on lossless compression of biometric iris data

Experimental study on lossless compression of biometric iris...

引用

International Symposium on Image and Signal Processing and Analysis

作者： Kurt Horvath Herbert Stögner Georg Weinhandel Andreas Uhl School of Communication Engineering for IT Carinthian University of Applied Sciences Klagenfurt Austria Department of Computer Sciences University of Salzburg Salzburg Austria

The impact of using different lossless compression algorithms when compressing biometric iris sample data from several public iris databases is investigated. In particular, we relate the application of dedicated lossless image codecs like lossless JPEG, JPEG-LS, PNG, and GIF, lossless variants of lossy codecs like JPEG2000, JPEG XR, and SPIHT, and a few general purpose compression schemes to rectilinear iris imagery. The results are discussed in the light of the recent ISO/IEC FDIS 19794-6 and ANSI/NIST-ITL 1-2011 standards and the IREX recommendations.

关键词： Image coding transform coding Iris recognition Databases IEC standards ISO standards

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A Novel Power Allocation Scheme for Robust Transmission of JPEG Compressed Images over MIMO System Using LLSE

A Novel Power Allocation Scheme for Robust Transmission of J...

引用

International Conference on Advances in Computing, Control, & Telecommunication Technologies (ACT)

作者： R. Deepa K. Baskaran Department of ECE Amrita Viswavidyapeetham University Coimbatore India Department of CSE Government College of Technology Coimbatore India

This paper deals with the efficient transmission of JPEG compressed images over Multiple Input Multiple Output (MIMO) systems using Spatial Multiplexing (SM). By exploiting the advantages of multiple antenna systems, data-rate, reliability, and throughput can be improved. The images are compressed using a progressive Discrete Cosine transform (DCT) based JPEG coder with spectral selection mode and an antenna selection scheme is performed (assuming perfect channel knowledge at the transmitter and receiver). The Signal to Interference Noise Ratio (SINR) of different antenna paths are calculated and the antennas are arranged in decreasing order of SINR's to transmit the different layers with a novel power allocation scheme. Linear Least Square Estimate (LLSE) algorithm is used to estimate the transmitted vector since it has the desirable property of not enhancing noise as much as the ZF estimator. The proposed scheme provides significant image quality improvement and less distortion compared to the existing EPA without SM.

关键词： Robustness transform coding Image coding MIMO Transmitting antennas Signal to noise ratio Samarium Discrete cosine transforms Power system reliability Throughput

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Quality Evaluation of Compressed Panoramic Images Constructed using MPEG-7-Based Image Registration

Quality Evaluation of Compressed Panoramic Images Constructe...

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Conference on Next Generation Internet Networks, NGI

作者： Andrzej Glowacz Michal Grega Piotr Romaniak Mikolaj Leszczuk AGH University of Science and Technology Krakow Poland

This paper describes an innovative compression method of panoramic images based on MPEG-7 descriptors. The proposed solution employs a detection of a series of individual video frame overlaps in order to produce concatenated panoramic images. The presented method is easy to implement even in simple devices such as low power consuming chipsets installed in remote cameras having limited power supplies. Under subjective tests it has been proved that the concatenation method allows for achieving lower transmission rates while sustaining picture quality.

关键词： Image coding transform coding Image registration Cameras Bandwidth MPEG 7 Standard Video compression Multimedia communication Concatenated codes Testing

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An 8 kbit/s transform coder for noisy channels

An 8 kbit/s transform coder for noisy channels

引用

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

作者： T. Moriya H. Suda NTT Human Interface Laboratories Musashino Tokyo Japan NTT Radio Communication System Laboratories Yokosuka Kanagawa Japan

The design of a speech transform coder which is robust against channel errors is presented. The bit rate is 8 kb/s including 1.3 kb/s redundancy bits for bit-selective error correction. The coder is based on transform coding with weighted vector quantization and two-channel conjugate vector quantization. Each scheme improves the robustness against channel errors without sacrificing the performance of the error-free case. Real-time operation can be achieved with 10 MIPS DSP and 8-kword memory with a 80-ms coding delay. The mean opinion score of the coded speech is comparable to that of 5-bit log PCM even at a 1% burst error rate.< >

关键词： Speech Robustness Vector quantization Bit rate Redundancy Error correction transform coding Digital signal processing Delay Phase change materials

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Design and Implementation of Embedded Video Terminal Based on Z228

Design and Implementation of Embedded Video Terminal Based o...

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2008 International Conference on Audio，Language and Image Processing(2008国际声音、语言、图像过程大会)

作者： Jin Zhou Xien Ye Faculty of Information Science and Engineering Ningbo University Zhejiang Province 315211 P.R.China

As many special attentions have been paid to modern teaching methods, the demands of multimedia teaching equipments are growing rapidly. However, most of the multimedia teaching equipments are still at a low level. In order to improve the situation, researching an embedded video terminal for teaching systems has practical significance. In this paper, we introduce an embedded video terminal that supports MPEG-4 and fits for multimedia teaching system. The terminal based on Z228 is able to decode MPEG-4 bit stream up to 30 frames per second at VGA (640 x 480) resolution. Additionally, as a highlight feature of the design, the implemented terminal is a low price solution in which only one chip is applied to realize complex MPEG-4 decoder.

关键词： transform coding Streaming media Hardware Education Decoding Software Control systems

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Towards a new numbering-combinations-based coder for image compression and transmission over a noisy channel

Towards a new numbering-combinations-based coder for image c...

引用

International Conference on Advanced Technologies for Signal and Image Processing (ATSIP)

作者： A. Kilani A. Makhloufi A. Ben Hamida H. Hamem National School of Engineering of Gabes (ENIG) Tunsia National School of Electronics and Telecommunications of Sfax (ENET‘COM) Tunisia National School of Engineering of Sfax (ENIS) Tunisia University of Moncton Canada

ISBN: (纸本)9781467385275

The image compression has always been one of the competitive fields of studies. It aims to represent an image in a minimal size in bytes without compromising the image quality. Our method; the numbering combinations method, consists on calculating all the possible combinations of the pixels and associate an index to our image through all the mentioned combinations. This index is a unique identifier of the image. However, with real images, the index of an image is a big number and it is difficult to manipulate it or to talk about image compression. The idea is to implement our algorithm as an image compression technique and test it in transmission to judge its performances.

关键词： Indexes Image coding transform coding Noise measurement Q-factor Image reconstruction Signal to noise ratio

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Robust moving video object segmentation in the MPEG compressed domain

Robust moving video object segmentation in the MPEG compress...

引用

IEEE International Conference on Image Processing

作者： Xiao-Dong Yu Ling-Yu Duan Qi Tian School of Electrical and Electronic Engineering Nanyang Technological University Singapore Institute for Infocomm Research Agency for Science Technology and Research Singapore

ISBN: (纸本)0780377508

In this paper, we proposed a robust moving video object segmentation algorithm using features in the MPEG compressed domain. We first cluster the motion vectors and produce a motion mask. Then, a difference mask at 8 x 8 block size is extracted from the DC image by background subtraction method. Finally, the motion mask and the difference mask are combined conditionally to generate the final object mask based on a set of rules that are application specified and is obtained with learning or heuristic based methods. The experimental results show that this object segmentation scheme is more robust than those using DC image or motion vectors only.

关键词： Robustness Video compression Object segmentation transform coding Clustering algorithms Discrete cosine transforms Image coding Image segmentation Decoding Video surveillance

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