检索结果-内蒙古大学图书馆

Iberian Conference on Information Systems and Technologies (CISTI)

作者： João Ferreira Nunes Pedro Miguel Moreira João Manuel R. S. Tavares Escola Superior de Tecnologia e Gestão Instituto Politécnico de Viana do Castelo Viana do Castelo Portugal Faculdade de Engenharia Universidade do Porto Porto Portugal

Content based retrieval and recognition of objects represented in images is a challenging problem making it an active research topic. Shape analysis is one of the main approaches to the problem. In this paper we propose the use of a reduced set of features to describe 2D shapes in images. The design of the proposed technique aims to result in a short and simple to extract shape description. We conducted several experiments for both retrieval and recognition tasks and the results obtained demonstrate usefulness and competiveness against existing descriptors. For the retrieval experiment the achieved bull's eye performance is about 60%. Recognition was tested with three different classifiers: decision trees (DT), k-nearest neighbor (kNN) and support vector machines (SVM). Estimated mean accuracies range from 69% to 86% (using 10-fold cross validation). The SVM classifier presents the best performance, followed by the simple kNN classifier.

关键词： Shape Classification algorithms Pixel Image retrieval Feature extraction transform coding Support vector machines

来源：评论

学校读者我要写书评

暂无评论

Natural DCT statistics approach to no-reference image quality assessment

Natural DCT statistics approach to no-reference image qualit...

引用

IEEE International Conference on Image Processing

作者： Michele A. Saad Alan C. Bovik Christophe Charrier University of Technology Austin USA University of Caen France

General-purpose no-reference image quality assessment approaches still lag the advances in full-reference methods. Most no-reference methods are either distortion specific (i.e. they quantify one or more distortions such as blur, blockiness, or ringing), or they train a learning machine based on a large number of features. In this approach, we propose a discrete cosine transform (DCT) statistics-based support vector machine (SVM) approach based on only 3 features in the DCT domain. The approach extracts a very small number of features and is entirely in the DCT domain, making it computationally convenient. The results are shown to correlate highly with human visual perception of quality.

关键词： Discrete cosine transforms Feature extraction Image quality transform coding Databases Anisotropic magnetoresistance Correlation

来源：评论

学校读者我要写书评

暂无评论

Three-dimensional imaging technology: A revolution in the world of imaging

Three-dimensional imaging technology: A revolution in the wo...

引用

Symposium on VLSI Circuits

作者： Satoru Fujikawa Strategic Semiconductor Development Center Panasonic Corporation Moriguchi Osaka Japan

Digital CE development has been fueled by furiously rapid advances in semiconductor technology. In video systems centered around television (TV), digital image processing technology underpins all of content creation, storage, transmission, and display. Today, these systems have been able to achieve high performance economically because of the realization of leading edge semiconductor technology. Digital video processing technology and system LSI technology have been the driving forces behind the creation of 3D imaging systems, which until recently have been difficult to realize and now are offering a whole new passion for people throughout the world. 2010 has seen an overwhelming presence of 3D in TV and Blu-ray Disc™* players and recorders now available to the consumer market, making this decidedly the inaugural year for 3D. Technological innovations in the field of 3D imaging will soon bring about new applications hard to imagine today.

关键词： Three dimensional displays TV Glass Imaging transform coding High definition video Large scale integration

来源：评论

学校读者我要写书评

暂无评论

Snapshot capture from live high definition video stream for transmission over low-bandwidth data link

Snapshot capture from live high definition video stream for ...

引用

IEEE Southeastcon

作者： Lloyd B. Mize Robert H. Klenke James M. McCollum School of Electrical and Computer Engineering Virginia Commonwealth University Richmond VA USA

This paper will describe a method for providing a useful intelligence down a low-bandwidth output stream from a high-bandwidth input stream. Many intelligence systems take advantage of streaming video and utilize high-bandwidth data links to supply information. The issue is that high-bandwidth systems typically require larger equipment, better line-of-sight, and more complex gear to keep a reliable link. The intended platform for the system described in this paper is an unmanned aerial vehicle, so the limitations of high-bandwidth equipment become more significant in a tactical scenario. By providing snapshots from the high-definition (HD) video stream, the system is able to send data to users that may not have the capability, due to a myriad of reasons, to acquire a full HD video stream. The system was developed using a Gumstix Verdex 600Mhz computer and the frame acquisition algorithm is written in C. Testing was done using HD video files streamed by VideoLan Client (VLC). The system is capable of outputting JPEG images at a maximum interval of 30 seconds. The capture system provides a method of reaching out to more users and providing functional data.

关键词： High definition video Streaming media Computer vision Unmanned aerial vehicles transform coding Data engineering Image coding Encoding Decoding MPEG 4 Standard

来源：评论

学校读者我要写书评

暂无评论

The JPEG XR Image coding Standard

引用

IEEE SIGNAL PROCESSING MAGAZINE 2009年第6期26卷 195-+页

作者： Dufaux, Frederic Sullivan, Gary J. Ebrahimi, Touradj Ecole Polytech Fed Lausanne Lausanne Switzerland Microsoft Corp Redmond WA 98052 USA

JPEG XR is the newest image coding standard from the JPEG committee. It primarily targets the representation of continuous-tone still images such as photographic images and achieves high image quality, on par with JPEG 2000, while requiring low computational resources and storage capacity. Moreover, it effectively addresses the needs of emerging high dynamic range imagery applications by including support for a wide range of image representation formats.

关键词： Image coding transform coding Image storage Digital photography IEC standards ISO standards Dynamic range Image quality Image representation Digital images

来源：评论

学校读者我要写书评

暂无评论

A Novel Design of Regular Cosine-Modulated Filter Banks for Image coding

引用

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES 2009年第7期E92A卷 1633-1641页

作者： Uto, Toshiyuki Ikehara, Masaaki Ohue, Kenji Ehime Univ Comp Sci Course Grad Sch Sci & Engn Matsuyama Ehime 7908577 Japan Keio Univ Fac Sci & Technol Dept Elect & Elect Engn Yokohama Kanagawa 2238522 Japan

This paper describes a design method of cosine-modulated filter banks (CMFB's) for in efficient coding of images. Whereas the CMFB has advantages of low design and implementation cost, subband filters of the CMFB do not have linear phase property. This prevents from employing a symmetric extension in transformation process, and leads to a degradation of the image compression performance. However, a recently proposed smooth extension alleviates the problem with CMFB's. As a result, well-designed CMFB's can be expected to be good candidates for a transform block in image compression applications. In this paper, we present a novel design approach of regular CMFB's. After introducing a regularity constraint on lattice parameters of a prototype filter in paraunitary (PU) CMFB's, we also derive a regularity condition for perfect reconstruction (PR) CMFB's. Finally, we design regular 8-channel PUCMFB and PRCMFB by an unconstrained optimization of residual lattice parameters, and several simulation results for test images are compared with various transforms for evaluating the proposed image coder based on the CMFB's with one degree of regularity. In addition, we show a computational complexity of the designed CMFB's.

关键词： transform coding cosine-modulated filter bank regularity lattice structure

来源：评论

学校读者我要写书评

暂无评论

Remote Vector Gaussian Source coding With Decoder Side Information Under Mutual Information and Distortion Constraints

引用

IEEE TRANSACTIONS ON INFORMATION THEORY 2009年第10期55卷 4676-4680页

作者： Tian, Chao Chen, Jun AT&T Labs Res Florham Pk NJ 07932 USA McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4K1 Canada

Let X,Y,Z be zero-mean, jointly Gaussian random vectors of dimensions n(x), n(y), and n(z), respectively. Let P be the set of random variables W such that W Y (X,Z) is a Markov string. We consider the following optim... 详细信息

Let X,Y,Z be zero-mean, jointly Gaussian random vectors of dimensions n(x), n(y), and n(z), respectively. Let P be the set of random variables W such that W <-> Y <->(X,Z) is a Markov string. We consider the following optimization problem: min(W is an element of P) I(Y;W vertical bar Z) subject to one of the following two possible constraints: 1) I(X;W vertical bar Z) >= R-1, and 2) the mean squared error between and (X) over cap = E(X vertical bar W, Z) is less than d. The problem under the first kind of constraint is motivated by multiple-input multiple-output ( MIMO) relay channels with an oblivious transmitter and a relay connected to the receiver through a dedicated link, while for the second case, it is motivated by source coding with decoder side information where the sensor observation is noisy. In both cases, we show that jointly Gaussian solutions are optimal. Moreover, explicit water filling interpretations are given for both cases, which suggest transform coding approaches performed in different transform domains, and that the optimal solution for one problem is, in general, suboptimal for the other.

关键词： Gaussian vector relay channel source coding with side information transform coding

来源：评论

学校读者我要写书评

暂无评论

A new integer image coding technique based on orthogonal polynomials

引用

IMAGE AND VISION COMPUTING 2009年第8期27卷 999-1006页

作者： Krishnamoorthi, R. Kannan, N. Anna Univ Comp Vis Lab Dept Informat Technol Bharathidasan Inst Technol Tiruchirappalli 620024 Tamil Nadu India

In this paper, a new image coding scheme based on orthogonal polynomials has been presented. From a set of orthogonal polynomial functions, we first obtain the polynomial operators and polynomial basis operators of different width to propose the polynomial transform coding. After applying the proposed transformation, the transform coefficients are threshold coded using quantization and bit allocation as in JPEG baseline system. The performance of the proposed transform coding is reported by computing peak signal-to-noise ratio (PSNR). The proposed coding scheme is also compared with other transform coding schemes such as Discrete Cosine transform and Discrete Wavelet transforms. (C) 2008 Elsevier B.V. All rights reserved.

关键词： Image compression transform coding Orthogonal polynomials Signal-to-noise ratio

来源：评论

学校读者我要写书评

暂无评论

STILL IMAGE coding USING A NEW transform

STILL IMAGE CODING USING A NEW TRANSFORM

引用

European signal processing conference

作者： Aldo Maalouf Mohamed Chaker Larabi XLIM-SIC Laboratory UMR CNRS 6172 University of Poitiers SP2MI-2 Bd Marie et Pierre Curie PO Box 30179 86962 Futuroscope Chasseneuil France

ISBN: (纸本)9781617388767

In this paper, we propose an image coding scheme based on a wavelet-like transform derived from orthogonal polynomial basis. First, 2D non-separable wavelet functions are derived from a set of bivariate orthogonal polynomials. Then, a wavelet-like transform coding scheme using the proposed wavelet functions is proposed. The motivation behind using orthogonal polynomials is that they exhibit some properties related to the human visual system (HVS) [1]. After applying the proposed transform, the obtained coefficients are threshold coded using quantization and bit allocation as in JPEG baseline system. The performance of the proposed transform coding method is reported. The proposed coding scheme is also compared with other transform coding methods such as JPEG, JPEG2000 and JPEG-XR/HDPHOTO.

关键词： labeling scheme transform coding wavelets Orthogonal polynomials JPEG STILL Quantization image coding method

来源：评论

学校读者我要写书评

暂无评论

Still image coding using a wavelet-like transform

Still image coding using a wavelet-like transform

引用

IEEE International Conference on Image Processing

作者： Aldo Maalouf Mohamed-Chaker Larabi Christine Fernandez-Maloigne XLIM-SIC Laboratory UMR CNRS 6172 University of Poitiers France

In this paper, a new image coding scheme based on a wavelet-like transform derived from orthogonal polynomial basis is presented. From a set of bivariate orthogonal polynomial functions, we first obtain the 2D non-separable wavelet functions to propose a wavelet-like transform coding. The motivation behind using orthogonal polynomials is that they exhibit some properties related to the human visual system (HVS). After applying the proposed transformation, the transform coefficients are threshold coded using quantization and bit allocation as in JPEG baseline system. The performance of the proposed transform coding is reported. The proposed coding scheme is also compared with other transform coding methods such as JPEG, JPEG 2000 and JPEG-XR/HDPHOTO.

关键词： Image coding Wavelet transforms transform coding Discrete cosine transforms Polynomials Discrete wavelet transforms Quantization Discrete transforms Frequency Image reconstruction

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：