检索结果-内蒙古大学图书馆

Scalable lossless compression algorithm for motion pictures

IEEE TRANSACTIONS ON CONSUMER ELECTRONICS 1998年第2期44卷 333-336页

作者： Wakatani, A Matsushita Elect Ind Co Ltd Corp Res Div Osaka Japan

Lossless JPEG is inherently a sequential algorithm. In order to achieve realtime encode/decode of lossless JPEG for motion pictures, it should be parallelized. We show the parallelized version of lossless JPEG and the allocation of virtual processors. We also describe the preliminary performance prediction of the algorithm to confirm the possibility of the realtime processing.

关键词： compression algorithms Motion pictures Transform coding Image coding Concurrent computing Decoding Biomedical imaging Image segmentation Discrete cosine transforms Motion estimation

来源：评论

学校读者我要写书评

暂无评论

Neural-network-based compression algorithm for gray scale images

Neural-network-based compression algorithm for gray scale im...

引用

IEEE International Joint Symposia on Intelligence and Systems

作者： Valova, I Kosugi, Y Tokyo Inst Technol Precis Machinery Syst Dept Midori Ku Yokohama Kanagawa 2268502 Japan

ISBN: (纸本)0818685484

This paper presents an image compression algorithm for gray scale images, based on neural networks. According to this algorithm the image will be first decomposed into Hadamard set of functions and second, the coefficients from the decomposition will be dynamically clustered by a newly proposed Dynamic Adaptive Clustering Method (DACM). We show that DACM converges to approximate the optimum solution based an the least sum of squares criterion theoretically and experimentally. We applied the compression method to various gray scale images and show its efficiency in providing high compression rates. In order to show some comparative results for the proposed method, we have chosen the well-known JPEG. its algorithm has similar structure and therefore is a good basis for comparison. The results from the gray scale images experiments are in favor of the proposed method.

关键词： grayscale images compression algorithms image compression algorithm compression ratio

来源：评论

学校读者我要写书评

暂无评论

Design of context-free grammars for lossless data compression

Design of context-free grammars for lossless data compressio...

引用

IEEE Information Theory Workshop

作者： Kieffer, JC Yang, E Univ Minnesota Dept Elect & Comp Engn Minneapolis MN 55455 USA

ISBN: (纸本)0780344081

Any context-free grammar G generates a language L(G). We are interested in context-free grammars G in which L(G) consists of exactly one string. Given a data string a: over a finite alphabet and a context-free grammar G such that L(G) = {x}, one call reduce G to a simpler grammar G' for which L(G') = {x} and for which certain constraints are satisfied. One then losslessly compresses x by losslessly compressing the grammar G'. The redundancy performance of this compression algorithm based upon reduced grammars is discussed.

关键词： context-free grammars compression algorithms lossless compression syntax Cosmic strings

来源：评论

学校读者我要写书评

暂无评论

Intellectual property protection systems and digital watermarking

引用

OPTICS EXPRESS 1998年第12期3卷 478-484页

作者： Lacy, J Quackenbush, SR Reibman, AR Snyder, JH AT&T Labs Res Florham Park NJ 07932 USA AT&T Labs Res Red Bank NJ USA

Adequate protection of digital copies of multimedia content - both audio and video - is a prerequisite to the distribution of this content over networks. Until recently digital audio and video content has been protected by its size: it is difficult to distribute and store without compression. Modern compression algorithms allow substantial bitrate reduction while maintaining high-fidelity reproduction. If distribution of these algorithms is controlled, cleartext uncompressed content is still protected by its size. However, once the compression algorithms are generally available cleartext content becomes extremely vulnerable to piracy. In this paper we explore the implications of this vulnerability and discuss the use of compression and watermarking in the control of piracy. (C) 1998 Optical Society of America.

关键词： .protected information hiding bitstream audio and video RESISTANT watermarks Intellectual Property compression algorithms Digital watermarking tamper cleartext LNCS Springer-Verlag

来源：评论

学校读者我要写书评

暂无评论

Low-power wireless video systems

引用

IEEE COMMUNICATIONS MAGAZINE 1998年第6期36卷 130-136页

作者： Meng, TH University of Stanford USA

This article presents the design principles for implementing low-power wireless video systems through the use of two examples, a single-chip digital video camera and a wireless video-on-demand system. The discussion will focus on the architectural and circuit techniques developed specifically for silicon integration of high-performance low-power wireless video systems. The proposed single-chip digital camera incorporates a parallel architecture to perform MPEG-2 encoding in real time, while the video-on-demand system employs an error-resilient compression algorithm to guard against the transmission errors often encountered in wireless communication. Both wireless video systems, one for encoding and the other for decoding, dissipate only tens of milliwatts of power, achieving a power reduction two orders of magnitude below standard solutions.

关键词： Video compression Digital cameras Encoding Wireless communication Circuits Silicon Parallel architectures Transform coding Real time systems compression algorithms

来源：评论

学校读者我要写书评

暂无评论

Interactive optimization and massively parallel implementations of video compression algorithms

Interactive optimization and massively parallel implementati...

引用

IEEE International Conference on Image Processing

作者： H. Nicolas F. Jordan CRAY Research EPF Lausanne Lausanne Switzerland Signal Processing Laboratory EPF Lausanne Lausanne Switzerland

This paper presents a new technique which allows interactive optimization of video compression algorithms using massively parallel computers such as the CRAY T3D. This work aims to exploit as much as possible the parallel nature of digital image processing algorithms to obtain almost real-time computing with the flexibility of a software implementation. Thanks to this low computation time, interactive tools have been developed which allow easy and fast visual evaluation of image quality. This leads to significant productivity gain when developing new video compression techniques. Our approach has been validated on advanced region-based video compression algorithms. The interactive facilities offered by the proposed technique permit the accurate optimization of the algorithm parameters in few minutes, where several days were previously needed. Depending on the complexity of the compression algorithms, 8-12 images are compressed, decompressed and visualized per second.

关键词： Video compression Signal processing algorithms compression algorithms Image coding Concurrent computing Visualization PSNR Image sequences Workstations Digital images

来源：评论

学校读者我要写书评

暂无评论

Performance of lossless compression algorithms on voiceband data

Performance of lossless compression algorithms on voiceband ...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： K.W. Ng A.J. Pollard L.R. Dacombe R.D. McLeod H.C. Card University of Manitoba Winnipeg MAN Canada Telecommunications Research Laboratory Winnipeg MAN Canada

Today's public switched telephone networks are being upgraded to use digital transmission and switching. The main disadvantage of digital transmission is the higher bandwidth required. To alleviate this problem, much research has been devoted into the compression of digitized voice signals. However, such compression techniques tend to have adverse effects on non-voice signals such as modems and faxes. This paper covers the performance of standard lossless compression algorithms on voiceband data signals.

关键词： Performance loss compression algorithms Modems Telephony Bandwidth Telecommunication switching Pulse modulation Phase change materials Testing ISDN

来源：评论

学校读者我要写书评

暂无评论

Hardware Implementation of MPEG Audio Real-Time Encoder

Hardware Implementation of MPEG Audio Real-Time Encoder

引用

作者： Joakim Enerstam Jan Peman Lulea University of Technology

学位级别：硕士

Audio compression is a requirement for efficient transmission and storage of high fidelity digital audio. Recently developed algorithms are able to compress audio up to 12 times, without losing any audible quality. In this thesis we look at different audio compression standards with regards to both compression rate and sound quality. The chosen algorithm, MPEG-1 Layer III, is discussed in detail concerning complexity and structure. We have also looked at different hardware technologies, especially digital signal processor solutions, suitable for an implementation of real-time encoders. A software prototype of a real-time encoder was built, based on MPEG-1 Layer III standard. The encoder was tested and verified in a simulator.

关键词： simulator TMS sound quality MPEG Audio compression rate high fidelity Audio compression MPEG Layer compression Techniques Trimedia compression algorithms Perceptual Encoders ADSP SHARC EZ-Kit

来源：评论

学校读者我要写书评

暂无评论

Multiband compression hearing aids: developing a performance metric

Multiband compression hearing aids: developing a performance...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： J.C. Schmidt J.C. Rutledge Starkey Laboratories Inc. Eden Prairie MN USA Division of Otolaryngology-HNS University of Maryland School of Medicine Baltimore MD USA

When attempting to compare different compression algorithms used in multiband compression hearing aids, or different parameter settings of a given compression algorithm, there is a need to compare equivalent amounts of compression. Since there are several parameters that influence the actual amount of compression that occurs, it is desirable to know which set of parameters will create the least perceptual difference from the original signal for a given amount of compression. Unfortunately, there is not a well defined approach for determining the amount of compression that has been imparted to a signal. Two degree of compression metrics are proposed that can be used to determine the amount of compression by direct analysis of the audio signal before and after compression. These metrics give excellent results in predicting the ratings of subject-based testing on the audio quality of several different audio segments across several parameter variations.

关键词： Hearing aids Measurement compression algorithms Frequency Signal analysis Testing Dynamic range Signal processing algorithms Histograms

来源：评论

学校读者我要写书评

暂无评论

Neural-network-based compression algorithm for gray scale images

Neural-network-based compression algorithm for gray scale im...

引用

IEEE International Joint Symposia on Intelligence and Systems

作者： I. Valova Y. Kosugi Precision Machinery Systems Department Tokyo Institute of Technology Yokohama Japan

This paper presents an image compression algorithm for gray scale images, based on neural networks. According to this algorithm the image will be first decomposed into Hadamard set of functions and second, the coefficients from the decomposition will be dynamically clustered by a newly proposed dynamic adaptive clustering method (DACM). We show that DACM converges to approximate the optimum solution based on the least sum of squares criterion theoretically and experimentally. We applied the compression method to various gray scale images and show its efficiency in providing high compression rates. In order to show some comparative results for the proposed method, we have chosen the well-known JPEG. Its algorithm has similar structure and therefore is a good basis for comparison. The results from the gray scale images experiments are in favor of the proposed method.

关键词： compression algorithms Image coding Clustering algorithms Neural networks Magnetic resonance imaging Clustering methods Image quality Image storage Space technology Digital images

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：