检索结果-内蒙古大学图书馆

Multifidelity JPEG based compression of images using variable quantisation

ELECTRONICS LETTERS 2001年第7期37卷 423-424页

作者： Golner, MA Mikhael, WB Krishnan, V Univ Cent Florida Sch Elect Engn & Comp Sci Orlando FL 32816 USA

In image processing applications. certain regions in an image may be of greater interest to the user. For these types of applications a multifidelity region based variable quantisation scheme is proposed. The resulting subjective visual quality is considerably higher than for comparable compression ratios employing the standard JPEG implementation.

关键词： subjective visual duality image and video coding data compression multifidelity JPEG based compression compression ratios image coding quantisation (signal) image compression Computer vision and image processing techniques variable quantisation

来源：评论

学校读者我要写书评

暂无评论

Transmission diversity for JPEG 2000

引用

ELECTRONICS LETTERS 2001年第23期37卷 1383-1384页

作者： Emami, S Motorola Labs Boynton Beach FL 33426 USA

A scheme for improving the performance of JPEG 2000 over noisy channels is presented. The detailed operation of the decoder based on a set of rules is provided. It is observed that the worst-case peak signal-to-noise ... 详细信息

关键词： telecommunication standards transmission diversity still image compression standard image and video coding data compression decoder signal-to-noise ratio image coding noisy channel JPEG 2000 decoding

来源：评论

学校读者我要写书评

暂无评论

Polar co-ordinates shape adaptive discrete transform-based watermarking scheme for arbitrarily-shaped object

引用

ELECTRONICS LETTERS 2001年第22期37卷 1330-1331页

作者： Ko, YH Kim, SD Korea Adv Inst Sci & Technol Dept Elect Engn & Comp Sci Div Elect Engn Yusong Gu Taejon 305701 South Korea

A new watermarking scheme for arbitrarily-shaped image is proposed, Using co-ordinate's conversion to log-polar and polar co-ordinates shape adaptive discrete transform (PSADT). the proposed watermarking method can be applied to any arbitrarily-shaped image such as MPEG-4 VOP and is much more robust to geometrical attacks than conventional ones.

关键词： message authentication image and video coding Integral transforms in numerical analysis data compression copy protection image coding discrete transforms polar co-ordinates shape adaptive discrete transform geometrical attack robustness Data security MPEG-4 VOP co-ordinates conversion watermarking scheme Signal processing theory arbitrarily-shaped image Computer vision and image processing techniques arbitrarily-shaped object

来源：评论

学校读者我要写书评

暂无评论

Programmable processor for on-line computing of inverse Haar transform

引用

ELECTRONICS LETTERS 2001年第16期37卷 1050-1052页

作者： Martín, O Solana, JM Univ Cantabria Fac Ciencias Dept Elect & Computadores E-39005 Santander Spain

A processor for the one-dimensional inverse Haar transform (1D-IFHT) programmable for N = 8 up to N = 1024, with low latency data flow is presented. It enables on-line computing of both the normalised and the non-norm... 详细信息

关键词： Haar transforms normalised IFHT Integral transforms in numerical analysis image and video coding Digital signal processing chips online computing image encoding image coding one-dimensional inverse Haar transform Microprocessors and microcomputers single configurable FPGA chip digital signal processing chips programmable processor Computer vision and image processing techniques low latency data flow field programmable gate arrays nonnormalised IFHT

来源：评论

学校读者我要写书评

暂无评论

Motion estimation using low-bit oriented edge image for DCT-based video compression

引用

ELECTRONICS LETTERS 2001年第8期37卷 494-495页

作者： Qiu, XH Zhang, WJ Chen, HY Zhou, R Tsing Hua Univ Inst Microelect Beijing 100084 Peoples R China

A novel block-based motion estimation algorithm using a low-bit resolution oriented edge image (LROEI) is proposed. The algorithm produces difference blocks with little texture for DCT coding and enhances the encoding efficiency. Simulation based on a hierarchical subsampling telescope search confirms that the quality of the LROEI is superior to that of luminance image compared with HSTS using an 8 bit luminance image The operational loads are also reduced to 75 or 50% without quality degradation.

关键词： Integral transforms in numerical analysis DCT coding edge detection DCT-based video compression luminance image data compression encoding efficiency hierarchical subsampling telescope search HSTS quality degradation operational loads difference blocks motion estimation image and video coding low-bit oriented edge image video signal processing block-based motion estimation algorithm discrete cosine transforms video coding image recognition

来源：评论

学校读者我要写书评

暂无评论

Efficient method for early detection of all-zero DCT coefficients

引用

ELECTRONICS LETTERS 2001年第3期37卷 160-161页

作者： Jun, S Yu, SY Shanghai Jiao Tong Univ Inst Image Commun & Informat Proc Shanghai 200030 Peoples R China

Based on the existing method, a more efficient algorithm for detecting all-zero DCT coefficient blocks before implementation of the discrete cosine transform and quantisation in very low bit rare video coding is proposed. The problem of the existing method is shown and an improved algorithm is provided. Simulation shows that the new method improves the detecting performance by similar to 10-20%.

关键词： image and video coding Integral transforms in numerical analysis early detection discrete cosine transform videophone applications quantisation all-zero DCT coefficients discrete cosine transforms video coding DCT coefficient blocks very low bit rate video coding videotelephony

来源：评论

学校读者我要写书评

暂无评论

Scene change detection algorithms for content-based video indexing and retrieval

引用

ELECTRONICS & COMMUNICATION ENGINEERING JOURNAL 2001年第3期13卷 117-126页

作者： Fernando, WAC Canagarajah, CN Bull, DR Asian Inst Technol Sch Adv Technol Klongluang 12120 Thailand Univ Bristol Image Commun Grp Bristol BS8 1UB Avon England Univ Bristol Ctr Commun Res Bristol BS8 1TH Avon England

There is an urgent need to extract key information from video automatically for the purposes of indexing, fast retrieval, and scene analysis. To support this vision, reliable scene change detection algorithms must be developed. Several algorithms have been proposed for both sudden and gradual scene change detection in uncompressed and compressed video. In this paper some common algorithms that have been proposed for scene change detection are reviewed. A novel algorithm for sudden scene change detection for MPEG-2 compressed video is then presented. This uses the number of interpolated macroblocks in B-frames to identify the sudden scene changes. A gradual scene change detection algorithm based on statistical features is also presented.

关键词： Information retrieval techniques retrieval Interpolation and function approximation (numerical analysis) gradual scene change detection data compression scene change detection algorithms content-based video indexing Information analysis and indexing compressed video uncompressed video B-frames scene analysis content-based retrieval video databases sudden scene change detection Other topics in statistics interpolation MPEG-2 compressed video image and video coding database indexing interpolated macroblocks Spatial and pictorial databases statistical features video signal processing video coding statistical analysis

来源：评论

学校读者我要写书评

暂无评论

Policing method for Markovian traffic descriptors of VBR MPEG sources over ATM networks

引用

IEE PROCEEDINGS-COMMUNICATIONS 2001年第2期148卷 70-76页

作者： Yoo, SJ Kim, SD Inha Univ Grad Sch Informat Technol & Telecommun Inchon 402751 South Korea Korea Adv Inst Sci & Technol Dept Elect Engn Taejon 305701 South Korea

An efficient policing mechanism for Markov model-based traffic descriptors of VBR MPEG video traffic is proposed. A VBR video sequence is described by a set of traffic descriptors using a scene-based Markov model for effective resource allocation and accurate QoS prediction. To monitor the input traffic from the source, the authors have defined a set of a limited number of representative monitoring parameters and also defined an exponential bounding function in order to accommodate dynamic behaviour. The simulation results show that the proposed policing mechanism for Markovian traffic descriptors monitors sophisticated traffic, such as MPEG video, effectively and also protects network resources from both malicious and abnormally behaved traffic.

关键词： code standards variable rate codes exponential bounding function quality of service video coding telecommunication standards telecommunication congestion control network resource allocation management monitoring parameters ATM networks bandwidth utilisation Communication switching call admission control input traffic monitoring telecommunication network management Markov processes network resources protection malicious traffic QoS prediction policing method packet switching video sequence scene-based Markov model telecommunication traffic Markovian traffic descriptor visual communication VBR MPEG sources abnormally behaved traffic image and video coding Network management flow control simulation results asynchronous transfer mode dynamic behaviour MPEG video traffic image sequences resource allocation

来源：评论

学校读者我要写书评

暂无评论

Vertex adjustment method using geometric constraint for polygon-based shape coding

引用

ELECTRONICS LETTERS 2001年第12期37卷 754-755页

作者： Yun, BJ Lee, SW Kim, SD Korea Adv Inst Sci & Technol Dept Elect Engn & Comp Sci Div Elect Engn Yusong Gu Taejon 305701 South Korea Hanbat Natl Univ Div Informat Commun & Comp Engn Yusong Gu Taejon 305719 South Korea

A new vertex selection scheme for polygon-based contour coding is proposed. The proposed method consists of 'two-step procedure'. Initial vertices are selected by using the conventional iterated refinement method (IRM) or progressive vertex selection (PVS) method. A vertex adjustment process then follows where the initial vertices are updated to produce an optimal polygon in the sense of 'error area'. In this step, the geometrical information of the partial contour and its polygon segment is used to reduce the search region for the admissible vertex position. Experimental results are presented to compare the approximation performances and the required computational burdens of the proposed and conventional methods.

关键词： image and video coding polygon shape contour coding image coding geometric constraint iterated refinement method vertex adjustment error area progressive vertex selection

来源：评论

学校读者我要写书评

暂无评论

Gradient-based predictor for diagonal edge pixels in JPEG-LS

引用

ELECTRONICS LETTERS 2001年第22期37卷 1327-1328页

作者： Edirisinghe, EA Bedi, S Loughborough Univ Technol Dept Comp Sci Loughborough LE11 3TU Leics England

JPEG-LS predictors have been optimised for the accurate prediction of pixels in the locality of horizontal/vertical edges. Here a low cost technique that accurately predicts the values of pixels along diagonal edges is proposed. It is shown that the proposed technique outperforms JPEG-LS in terms of predicted mean squared error, by a margin of up to 11.23%.

关键词： image and video coding data compression image coding prediction theory low cost technique diagonal edge pixels edge detection image recognition gradient-based predictor Computer vision and image processing techniques image compression JPEG-LS predictors diagonal edge patterns

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：