检索结果-内蒙古大学图书馆

Innovative technologies for space-based radars

IEE PROCEEDINGS-RADAR SONAR AND NAVIGATION 2003年第3期150卷 104-112页

作者： Zahn, R Astrium GmbH D-88039 Friedrichshafen Germany

In recent years technology developments for SAR front-end and for on-board SAR data processing have been performed at Astrium GmbH, Germany. Remarkable progress has been made in the respective demonstrator projects DE... 详细信息

关键词： TOPAS demonstrator projects Astrium SAR image compression data compression research initiatives SAR front-end Radar theory on-board SAR data processing Research and development space-based radar Radar equipment, systems and applications image coding EUCLID RTP 9.7 DESA radar imaging image and video coding Germany synthetic aperture radar innovative technologies

来源：评论

学校读者我要写书评

暂无评论

Self-conjugate watermarking technique for halftone images

引用

ELECTRONICS LETTERS 2003年第4期39卷 356-358页

作者： Fu, MS Au, OC Hong Kong Univ Sci & Technol Dept Elect & Elect Engn Hong Kong Peoples R China

A novel method for hiding visual patterns in a single error diffused halftone image is presented, called self-conjugate error diffusion (SCED). The hidden patterns appear on the halftone image when the halftone image is folded or is overlapped with its own related version. Simulation results show that the halftone images have good visual quality and the hidden pattern is clearly visible.

关键词： message authentication image overlapping visual pattern hiding hidden patterns NXOR operation Boolean operations image and video coding rotated version halftone images image coding image folding watermarking data encapsulation self-conjugate watermarking technique Computer vision and image processing techniques self-conjugate error diffusion

来源：评论

学校读者我要写书评

暂无评论

Low-power VLSI architectures for 3D discrete cosine transform (DCT) 46

Low-power VLSI architectures for 3D discrete cosine transfor...

引用

46th IEEE International Midwest Symposium on Circuits and Systems

作者： Saponara, S Fanucci, L Terreni, P Univ Pisa Dept Informat Engn I-56122 Pisa Italy

ISBN: (纸本)0780382943

The 3D Discrete Cosine Transform (DCT) extends the energy compaction properties of conventional 2D-DCT to integral 3D images and to the spatio-temporal coding of 2D video sequences. This paper addresses the problem of a cost-effective VLSI realization of the 3D-DCT and its inverse (IDCT). The VLSI design space is exploited at different levels of abstraction (algorithm, architecture, circuit, technology) to devise a family of 3D-DCT/IDCT macrocells that, implemented in a 0.18 mu m CMOS technology, support the real-time processing of main video formats with different trade-offs between circuit complexity and power consumption. A clock-gating design strategy further reduces power consumption according to input signal statistics.

关键词： VLSI design DCT image and video coding low-power circuits

来源：评论

学校读者我要写书评

暂无评论

Study of mutual scan-line fractal coding

Study of mutual scan-line fractal coding

引用

Conference on Visual Communications and image Processing 2003

作者： Limmaneepraserth, P Varakulsiripunth, R King Mongkuts Inst Technol Res Ctr Commun & Informat Technol Bangkok 10520 Thailand

ISBN: (纸本)0819450235

In this paper, we concentrate on mutual scan-line fractal coding (MSFC), which is a novel fractal coding approach, and its performance. The purposes of this study are to examine the advantages and disadvantages of the MSFC. The main idea of this approach is to make use of similarity of each imaging scan-line pair. In this method, the domain pool is designed by using equivalent property of two complete metric spaces. Then, the domain-range mapping, which is at the heart of iterated contractive transformation, is implemented with a pair of contractive affine transformations for generating mutual fractal codes. This method provides the small size of domain pools, thus speeding up the encoding time. The experimental results illustrate that the proposed approach can reduce both encoding and decoding times and also maintain coding efficiency in bit rate at the range of 1.2-2.5 bpp, without any entropy encoding at the end of the scheme.

关键词： mutual scan-line fractal coding self-similarity contractive transformation image and video coding

来源：评论

学校读者我要写书评

暂无评论

image compression using wavelets and JPEG2000: a tutorial

引用

ELECTRONICS & COMMUNICATION ENGINEERING JOURNAL 2002年第3期14卷 112-121页

作者： Lawson, S Zhu, J Univ Warwick Sch Engn Coventry CV4 7AL W Midlands England

The demand for higher and higher quality images transmitted quickly over the Internet has led to a strong need to develop better algorithms for the filtering and coding of such images. The introduction of the JPEG2000 compression standard has meant that for the first time the discrete wavelet transform (DWT) is to be used for the decomposition and reconstruction of images together with an efficient coding scheme. The use of wavelets implies the use of subband coding in which the image is iteratively decomposed into high- and low-frequency bands. Thus there is a need for filter pairs at both the analysis and synthesis stages. This paper aims in tutorial form to introduce the DWT, to illustrate its link with filters and filterbanks and to illustrate how it may be used as part of an image coding algorithm. It concludes with a look at the qualitative differences between images coded using JPEG2000 and those coded using the existing JPEG standard.

关键词： Integral transforms in numerical analysis tutorial image decomposition filtering subband coding high-frequency bands discrete wavelet transform filtering theory data compression Internet JPEG2000 FIR filters image coding low-frequency bands Computer vision and image processing techniques image compression filterbanks image reconstruction channel bank filters transform coding discrete wavelet transforms image and video coding Filtering methods in signal processing DWT

来源：评论

学校读者我要写书评

暂无评论

video coding using greedy decompositions on generalised bit-planes

引用

ELECTRONICS LETTERS 2002年第11期38卷 507-508页

作者： Caetano, R da Silva, EAB Ciancio, AG Univ Fed Rio de Janeiro PEE COPPE DELEE BR-21945970 Rio De Janeiro Brazil

A novel method for performing greedy decompositions using generalised bit-planes is proposed. It provides an elegant solution to the trade-off between quantisation of coefficients and number of passes in the matching pursuits algorithm. In addition. ss hen replacing the matching pursuits algorithm in video coding, it provides a significant performance improvement.

关键词： image and video coding generalised bit-planes video signal processing greedy decompositions matching pursuits algorithm video coding

来源：评论

学校读者我要写书评

暂无评论

Quantisation step selection schemes in JPEG2000

引用

ELECTRONICS LETTERS 2002年第12期38卷 547-549页

作者： Long, M Tai, HM Yang, S Univ Tulsa Dept Elect Engn Tulsa OK 74104 USA

Modified quantisation step selection schemes for the uniform dead-zone scalar quantisation as used in Part I of the JPEG2000 standard are presented. Effects of these quantisation schemes on the lossy compression performance of 5/3 integer wavelet transforms are evaluated. The experiment is carried Out in the JPEG2000 framework. Similar consideration may be applied to the real wavelet transforms for lossy image compression.

关键词： wavelet transforms transform coding image and video coding data compression lossy compression performance image coding quantisation (signal) JPEG2000 standard uniform dead-zone scalar quantisation quantisation step selection schemes Computer vision and image processing techniques image compression integer wavelet transforms

来源：评论

学校读者我要写书评

暂无评论

Improved searching scheme for fractal image coding

引用

ELECTRONICS LETTERS 2002年第25期38卷 1653-1654页

作者： Lai, CM Lam, KM Siu, WC Hong Kong Polytech Univ Dept Elect & Informat Engn Ctr Multimedia Signal Proc Hong Kong Hong Kong Peoples R China

The authors propose using a non-symmetric window to search for the best matched domain block based on the local variances method. Experimental results show that the proposed scheme can achieve a speedup of 50% with on... 详细信息

关键词： image and video coding data compression nonsymmetric window fractals image coding matched domain block search problems fractal image coding speedup compression ratio improved searching PSNR image representation reconstructed image Computer vision and image processing techniques local variances method

来源：评论

学校读者我要写书评

暂无评论

Hausdorff distance for robust and adaptive template selection in visual target detection

引用

ELECTRONICS LETTERS 2002年第25期38卷 1651-1653页

作者： Gastaldo, P Zunino, R Univ Genoa DIBE I-16145 Genoa Italy

Template selection is often crucial for target-detection methods;the Hausdorff distance enhances template matching by implicitly encoding the notion of resemblance. In addition, Hausdorff metrics can build up a decision map to solve the template-sizing and selection problems adaptively. The low computational cost of the method fits video-surveillance applications.

关键词： resemblance encoding video-surveillance applications template-sizing television applications low computational cost Hausdorff metrics image matching data compression Hausdorff distance robust template selection image coding visual target detection Applications of television systems Computer vision and image processing techniques adaptive signal processing surveillance template matching image and video coding adaptive template selection decision map

来源：评论

学校读者我要写书评

暂无评论

Using inter-frame dependence history to select intra-refresh blocks

引用

ELECTRONICS LETTERS 2002年第22期38卷 1337-1338页

作者： Zhao, C Ngan, KN Zhang, J Mathew, R Zhang, X Nanyang Technol Univ Sch Comp Engn Singapore 639798 Singapore Motorola Australia Res Ctr Botany NSW 2019 Australia

To prevent error propagation in predictive video coding, intra-refresh methods are often employed. Here, a new algorithm for macroblock intra-refresh that is based on pixel level inter-frame dependence history is proposed. This new method keeps track of the coding mode of every pixel and refreshes those macroblocks that contain pixels with a long history record. Simulation results show that the new algorithm performs better than the existing methods while maintaining the same bit rate.

关键词： intra-refresh blocks selection macroblock intra-refresh image and video coding inter-frame dependence history error propagation problem video signal processing H.263 video coding MPEG-4 predictive video coding

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：