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共 327 条记录，以下是161-170 订阅

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Radon Transform Based Real-Time Weed Classifier

Radon Transform Based Real-Time Weed Classifier

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Muhammad Inam ul Haq Abdul Muhamin Naeem Irshad Ahmad Muhammad Islam Center of IT Institute of Management Sciences Peshawar Pakistan Department of Computer Sciences Farabi College Peshawar Brazil Department of Computer Sciences Islamia College Peshawar Pakistan Department of Telecom Engineering FAST-NU Peshawar Pakistan

A machine vision system to detect and discriminate crop and weed plants in a commercial agricultural environment was developed and tested. Images are acquired in agricultural fields under natural illumination were studied extensively, and a weed classifier based on Radon transform is developed. This classifier is specifically developed to classify images into broad (having broad leaves) and narrow (having narrow leaves) classes for real-time selective herbicide application. The developed system has been tested on weeds in the lab; the results shows reliable performance and significantly less computational efforts on images of weeds taken under varying field conditions. The analysis of the results shows over 93.5% classification accuracy over a database of 200 sample images with 100 samples from each category of weeds.

关键词： Costs Spraying Crops Production Telecommunication computing Educational institutions Environmental economics System testing Protection Real time systems

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Visualizing author attribution using Blobby objects

Visualizing author attribution using Blobby objects

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： T. Mala T.V. Geetha Department of Computer Science & Engineering College of Engineering Anna University India

In this paper, we propose a set of distinct features that endeavors to recognize the author of the text documents, independent of the theme of the document. The features are used to distinguish the unique style of every author. The features proposed are independent of the theme, so the features are suitable for any type of text document. Thus, it will be useful for systems that train themselves to particular users in order to identify the author automatically. Blobby objects are modeled based on the author attribution information and the objects depict authors features, author feature weight ages and the author identification for each and every document. The visual display of author attribution is useful in depicting the differences or similarities in the style of author, based on the features as a measure. The blobby objects are implicitly modelled and they move and join together showing the author of the document with the authors feature set values. Gestalt laws were applied to the perceived visual output to visualize author attribution.

关键词： Visualization Length measurement Writing computer science Natural language processing Text processing Natural languages Text recognition Displays Statistical analysis

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A Non-parametric Guide for Radiance Sampling in Global Illumination

A Non-parametric Guide for Radiance Sampling in Global Illum...

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International conference on computer graphics, imaging and Visualization, CGIV

作者： Pankaj Khanna Mel Slater Jesper Mortensen Insu Yu Department of Computer Science University College London London UK Department de LSI ICREA-Universitat Politécnica de Catalunya Barcelona Spain

Global illumination as described by the radiance and potential equations is essentially a sampling problem. This sampling has two elements: 'where' to sample and 'how' to sample. In this paper we propose an alternative method to non-parametric ally simplify the problem of 'where' in the general case. We present a solid angle based uniform sampling scheme with an efficient conservative cull of solid angles not affecting the transfer of radiance between two surfaces. This construction also provides a geometric area bounds within which a surface can receive energy from another along directions contained in the solid angle. The technique can be used to illuminate a scene from a general emitter, including incident light fields. The method has several applications and advantages, with results showing good sampling efficiency and speed.

关键词： Sampling methods Lighting Layout Solids Monte Carlo methods Equations Surface reconstruction computer science Educational institutions Large scale integration

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Improvement of Collision Detection Performance of Hierarchies by Using Dynamic-Density of 3D Objects Based on LOD (Level-of-Detail)

Improvement of Collision Detection Performance of Hierarchie...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： ChunHo Yi WonSeop Kim TaeYong Kim Research Institute for Networks and Communications Engineering Radio and Optical Communications Laboratory Chung-Ang University Seoul South Korea

This paper is many studies have been conducted focusing on standard objects in 3D space for quick and exact collision detection in 3D graphics. A great deal of these took interest in the improvement of performance speed of collision detection of 3D objects, and in realization of realistic expressions along with the marvelous advancement of 3D graphics hardware. In this paper, features of various collision detection algorithms for standard 3D objects among 3D graphic algorithms were analyzed, and a 'dynamic density' that utilizes the center value and corner points of standard objects in simple hierarchic structures of existing 3D objects is suggested. By using this algorithm, an LOD (level-of-detail) algorithm can be applied to 3D space to improve collision detection of 3D objects in a 3D space. Also, through suggesting efficient rendering of 3D dimensional spaces as an important element of 3D graphics and a realistic expression method, the realism and efficiency of 3D games, which regards the real-time element as an important one, can be greatly improved.

关键词： Object detection Rendering (computer graphics) computer graphics Hardware Conductive films Detection algorithms Algorithm design and analysis Engines Data structures Real time systems

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Multi-Resolution System for MRI (Magnetic Resonance imaging) Image Compression: A Heterogeneous Wavelet Filters Bank Approach

Multi-Resolution System for MRI (Magnetic Resonance Imaging)...

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International conference on computer graphics, imaging and Visualization, CGIV

作者： Shivanand S. Gornale V.T. Humbe S.S. Jambhorkar Pravin Yannawar R.R. Manza K.V. Kale Department of Computer Science Pune University Pune Maharashtra India Dr. Babasaheb Ambedkar University Aurangabad Maharashtra India

In telemedicine, the storage of image and forwarding of image requires high storage space and high bandwidth respectively. To save the storage space and to reduce the bandwidth for communication; the image is to be compressed. Recently the multi-resolution technique by wavelet transform has emerged as a cutting edge technology within the field of image analysis and compression. Relatively new class of wavelets called multiwavelet; are new addition to the body of wavelet theory. Realizable as matrix-valued filter banks leading to wavelet basis, were introduced and which are able to posses all desirable properties like orthogonality, symmetry, and short support etc. simultaneously, which are needed for better performance compression. In this paper we have proposed a heterogeneous wavelet filter approach for MRI image compression. The performance of the proposed method is compared and analyzed in detail and the promising results and findings are presented.

关键词： Magnetic resonance imaging Image coding Filter bank Image storage Space technology Bandwidth Telemedicine Wavelet analysis Wavelet transforms Image edge detection

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Animating and Interacting with Graphical Evidence : Bringing Courtrooms to Life with Virtual Reconstructions

Animating and Interacting with Graphical Evidence : Bringing...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Damian Schofield Computer Games and Digital Media School of Creative Media RMIT University Melbourne Australia

Three-dimensional (3D) reconstructions of evidence offer great potential in the field of forensic science. They can help in the presentation of complex spatial and temporal data to a non-technical audience. In addition to these 3D technologies, the digital age has brought a plethora of new evidence forms, evidence detection methods, and means of evidence presentation. This position paper describes the previous use of 3D reconstruction evidence in courtrooms. It then outlines the forensic process in terms of tasks and phases involved, and describes the state of the art in terms of digital technology usage. The paper then presents a taxonomy of these phases in terms of a technology continuum. It goes on to highlight areas where new applications of 3D digital technologies could be used to enhance particular phases of the forensic process. This paper does not deal with security issues relevant to the devices discussed.

关键词： Animation Forensics Image reconstruction Layout Virtual reality Data visualization Road accidents Virtual environment Application software Taxonomy

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Visualization of astrophysical simulations using IDL Object graphics

Visualization of astrophysical simulations using IDL Object ...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： D. Pomarede E. Audit A.S. Brun V. Gautard F. Masset R. Teyssier B. Thooris CEA/DSM/DAPNIA SEDI/LIAS and SAp France

The ability to interactively visualize the complex products of three-dimensional simulations is a key aspect in the validation and verification process of numerical algorithms and frameworks. Computational astrophysics, which benefits from the rapidly increasing computing resources offered by the use of massively parallel mainframes, is a challenging play ground to scientific visualization. In this paper, we describe a graphical package developed in the framework of IDL object graphics. The requirements governing its design are defined in the context of the COAST software project which aims at providing an ensemble of enabling tools and techniques for the development and the validation of major simulation codes. This covers a wide range of applications, including cosmological formation of large-scale structures, turbulences in the interstellar medium, stellar magnetohydrodynamics, and formation of proto-planetary systems. The use of IDL object graphics provides an interactive and immersive visualization of complex scenes where various fields of different nature are entangled. Three-dimensional scalar and vector fields distributed over regular mesh grids or more complex structures such as adaptive mesh refinement data, as well as N-body systems, can be visualized in a number of different, complementary ways.

关键词： graphics Computational modeling Concurrent computing Data visualization Astrophysics Packaging Software tools Context modeling Application software Large-scale systems

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Upper Facial Action Units Recognition Based on KPCA and SVM

Upper Facial Action Units Recognition Based on KPCA and SVM

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Chunfeng Yang Yongzhao Zhan School of Computer Science and Telecommunication Engineering Jiangsu University Zhenjiang Jiangsu China

The existing methods of facial action unit recognition are always affected by illumination and individual difference. An upper facial action units recognition method based on KPCA and SVM is presented in this paper. In this method, KPCA algorithm which is formed by choosing and designing kernel function in terms of visual features of upper facial action units is used to extract the upper facial action unit feature and the two features associated with illumination effect are removed. Then the optimal kernel function and chastisement factor in SVM algorithm are determined by experiments. Finally the SVM is used to classify and recognize action units. This method is tested on the Cohn-Kanade 's facial expression image database. The average recognition rate achieves 90.6% and the recognition speed is also fast. The experiments show that this method is not sensitive to illumination and individual difference and can be used to real time recognition.

关键词： Face recognition Support vector machines Lighting Eyebrows Face detection Image segmentation Pixel Kernel Support vector machine classification Image recognition

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Constructing Accurate Fuzzy Classification Systems: A New Approach Using Weighted Fuzzy Rules

Constructing Accurate Fuzzy Classification Systems: A New Ap...

引用

International conference on computer graphics, imaging and Visualization, CGIV

作者： Seyyed Mostafa Fakhrahmad Mansour Zolghadri Jahromi Islamic Azad University of Shiraz Iran Department of Computer Science & Engineering Shiraz University Shiraz Iran

Different approaches to design fuzzy rule-based classification systems can be grouped into two main categories: descriptive and accurate. In the descriptive category, the emphasis is on the interpretability of the resulting classifier. The classifier is usually represented by a set of short fuzzy rules (i.e., with a few number of antecedent conditions) that make it a suitable tool for knowledge representation. In the accurate category, the generalization ability of the classifier is the main target in the design process and no attempt is made to use understandable fuzzy rules in constructing the rule base. In this paper, we propose a simple and efficient method to construct an accurate fuzzy classification system. We use rule-weight as a simple mechanism to tune the classifier and propose a new method of rule-weight specification for this purpose. Through computer simulations on some data sets from UCI repository, we show that the proposed scheme achieves better prediction accuracy compared with other fuzzy and non- fuzzy rule-based classification systems proposed in the past.

关键词： Fuzzy systems Fuzzy sets Design engineering Learning systems Knowledge representation Knowledge based systems computer science Process design computer simulation Accuracy

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Profile Based Information Retrieval from Printed Document Images

Profile Based Information Retrieval from Printed Document Im...

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International conference on computer graphics, imaging and Visualization, CGIV

作者： S. Abirami D. Manjula Department of Computer Science & Engineering College of Engineering Anna University Chennai India

This paper performs a profile based Information Retrieval from printed document image collections. Keywords are valuable indexing tools and if they can be identified at the image level, extensive computation during recognition will be avoided. Printed documents can be scanned to produce document images. Instead of converting entire document images into text equivalent, word profiles are identified to match the word images in Bilingual document images.(English and Tamil). During retrieval, the same profile could be extracted from the user specified word and can be matched with the word images in the document. This yields a faster result even in a quality-degraded document. This kind of Information Retrieval (Keyword Based Search) can be adapted in Digital Libraries, which employs digitized documents instead of text processing. This promotes efficient search in document images irrespective of the language.

关键词： Information retrieval Image retrieval Image converters Image recognition Character recognition Image segmentation Optical character recognition software Pixel Software libraries Natural languages

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