检索结果-内蒙古大学图书馆

Efficient and consistent method for superellipse detection

IEE PROCEEDINGS-vision image AND SIGNAL processing 2001年第4期148卷 227-233页

作者： Hu, WC Sheu, HT Natl Penghu Inst Technol Dept Comp Sci & Informat Engn Makung City Penghu Penghu Taiwan Natl Taiwan Univ Sci & Technol Dept Elect Engn Sect 4 Taipei Taiwan

Superellipses are a flexible representation for a variety of objects and the detection of such a primitive is an interesting issue in machine vision research. Least-mean-square fitting using an algebraic distance has been suggested to determine the parameters of a superellipse, but the computational cost is high and a high curvature bias problem is involved. An efficient, consistent and threshold-free scheme is derived for the estimation of superellipse parameters. The closed solutions for the centre, orientation and squareness parameters are obtained by using the zeroth harmonic of its Fourier description, the consistent symmetric axis method and the theorem of diagonal segment, respectively. Only the lengths of the major and the minor axes are repeatedly estimated by Powell's conjugate direction technique to reduce the sensitivity of noise. The proposed method is suitable for use on relatively complete, closed superellipse curves. Both convex and concave superellipses have been considered, and a compensation technique is suggested for concave superellipses. Experiments with complete and disjoint superellipses, defective superellipses and superellipses extracted from a photograph of a real object indicate the efficiency, accuracy and reliability of the proposed method, both theoretically and practically.

关键词： orientation least mean squares methods least-mean-square fitting squareness parameters computational cost superellipse parameters estimation signal detection Simulation, modelling and identification algebraic distance computer vision parameter estimation complete superellipses threshold-free scheme real object photograph defective superellipses superellipse detection compensation technique Graphics techniques centre diagonal segment theory computer vision and image processing techniques disjoint superellipses Interpolation and function approximation (numerical analysis) reliability curve fitting Optical, image and video signal processing closed superellipse curves zeroth harmonic consistent symmetric axis method machine vision research curvature bias problem consistent method Powell's conjugate direction technique concave superellipses efficient method convex superellipses closed solutions object representation noise sensitivity reduction accuracy Fourier description

来源：评论

学校读者我要写书评

暂无评论

Progressive image coding using set partitioning in hierarchical tree algorithm and embedded trellis-coded quantiser

引用

ELECTRONICS LETTERS 2001年第9期37卷 561-563页

作者： Hu, MY Tang, TB Nanyang Technol Univ Sch Elect & Elect Engn Singapore 639798 Singapore

A progressive image-coding algorithm that uses a combination of the set partitioning in hierarchical tree (SPIHT) algorithm and an embedded trellis-coded quantiser (E-TCQ) is proposed. Using the hierarchical quadtree structure, a significant map of coefficients is encoded. The E-TCQ is then used to refine the amplitude of the method. It is shown that this method gives good performance, with very little increase in computational complexity and storage memory.

关键词： significant map of coefficients encoding hierarchical quadtree structure image and video coding quadtrees image coding quantisation (signal) embedded trellis-coded quantiser trellis codes SPIHT algorithm progressive image-coding algorithm set partitioning in hierarchical tree algorithm computer vision and image processing techniques computational complexity

来源：评论

学校读者我要写书评

暂无评论

Multifidelity JPEG based compression of images using variable quantisation

引用

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

Edge detection-based block motion estimation

引用

ELECTRONICS LETTERS 2001年第1期37卷 17-18页

作者： Ahmad, MB Choi, TS Kwangju Inst Sci & Technol Dept Mechatron Puk Gu Kwangju 500712 South Korea

Block matching algorithms that predict the motion field using blocks of pixels use search heuristics to find the best match. Blocks on the boundary of moving objects create problems for accurately predicting tb: motion vectors, and make fur uncomfortable viewing. The authors propose a new method for accurately determining the motion vectors using the edge-matching criteria. This method gives good motion estimation, with reduced computational requirements.

关键词： motion vectors edge detection-based estimation motion estimation image processing Optical, image and video signal processing motion field prediction block motion estimation edge-matching criteria edge detection computer vision and image processing techniques image matching

来源：评论

学校读者我要写书评

暂无评论

image-sequence motion estimation for the Dervish mine-clearance vehicle

引用

IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY 2001年第3期148卷 89-94页

作者： Haworth, C Renshaw, D Univ Edinburgh Dept Elect & Elect Engn Edinburgh EH9 3JL Midlothian Scotland

The paper reports on the application of block matching with spatial transforms to image sequences of ground scenes taken from a moving camera. The motion is a general combination of rotation and translation. The use of spatial transforms with interpolation filtering to generate rotation reference templates and the hardware implementation, for use on a robot mine-clearance vehicle, are novel. It is shown that the emerging generation of single chip floating-point digital signal processors and CMOS image sensors are well suited to rapid prototyping of image sequence analysis, which has previously been the domain of expensive camera and custom VLSI hardware or cumbersome parallel machines.

关键词： Dervish mine-clearance vehicle Digital signal processing chips spatial transforms motion estimation VLSI moving camera rotation reference templates custom VLSI Automobile electronics block matching image matching computer vision and image processing techniques digital signal processing chips translation Interpolation and function approximation (numerical analysis) rotation Integral transforms in numerical analysis single chip floating-point digital signal processors Mobile robots Optical, image and video signal processing ground scenes image-sequence motion estimation rapid prototyping CMOS image sensors transforms image sequence analysis image recognition parallel machines interpolation image sensors image sequences Microprocessors and microcomputers mine-clearance vehicle robot vision automotive electronics

来源：评论

学校读者我要写书评

暂无评论

Interpretation of colour maps - A combination of automatic and interactive techniques

引用

COMPUTING & CONTROL ENGINEERING JOURNAL 2001年第4期12卷 188-196页

作者： Ablameyko, S Bereishik, V Homenko, M Paramonova, N Patsko, O Belarussian Acad Sci Inst Engn Cybernet Minsk 220012 BELARUS

The article describes a system and technology for the automatic/interactive interpretation of colour maps. Due to the fact that a completely automatic solution is impossible, a combination of automatic and interactive techniques is used. Firstly, colour recognition and separation are performed. For automatic map vectorisation, a special fast scheme is used. To make digitisation more automatic and user friendly, an interactive digitising mode has been developed to extract line-based cartographic objects from vectorised data. The system is used successfully in the digitisation of topographic and other types of map.

关键词： map digitisation interactive digitising mode cartography image colour analysis colour map interpretation User interfaces special fast scheme automatic/interactive interpretation vectorised data image recognition Geography and cartography computing object recognition colour recognition computer vision and image processing techniques automatic map vectorisation interactive techniques interactive systems image recognition line-based cartographic objects

来源：评论

学校读者我要写书评

暂无评论

Role of 3-D graphics in NDT data processing

引用

IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY 2001年第4期148卷 149-158页

作者： McNab, A Reilly, D Potts, A Toft, M Univ Strathclyde Dept Elect & Elect Engn Ctr Ultrasonc Engn Glasgow G1 1XW Lanark Scotland BNFL Magnox Generat Berkeley GL13 9PB Glos England

Visualisation in 3-D can significantly improve the interpretation and understanding of imaged NDT data sets. The advantages of using 3-D graphics to assist in the interpretation of ultrasonic data are discussed in the context of an advanced software environment for the reconstruction, visualisation and analysis of 3-D images within a component CAD model. The software combines the analysis features of established 2-D packages with facilities for real-time data rotation, interactive orthogonal/oblique slicing and 'true' image reconstruction, where scanning-surface shape and reflection from component boundaries are accounted for through interaction with the full 3-D model of the component. A number of novel facilities exploit the graphics capability of the system. These include the overlay of 3-D images with individual control of image transparency;a floating tooltip window for interrogation of data point co-ordinates and amplitude;image annotation tools, including 3-D distance measurement;and automated defect sizing based on '6dB drop' and,maximum amplitude' methods. A graphical user interface has also been designed for a well established flaw response model, which allows the user to easily specify the flaw size, shape, orientation and location;probe parameters and scan pattern on the component. The output is presented as a simulated ultrasound image.

关键词： Graphical user interfaces scanning-surface reflection CAD Materials testing 3D graphics role graphical user interface real-time data rotation Testing flaw detection maximum amplitude method graphical user interfaces component CAD model simulated ultrasound image Graphics techniques ultrasonic materials testing computerised instrumentation Programming support scanning-surface shape floating tooltip window interactive orthogonal/oblique slicing computer vision and image processing techniques imaged NDT data sets ultrasonic data images overlay flaw response model inspection flaw location data point coordinates image transparency control 3D visualisation automated defect sizing Optical, image and video signal processing Instrumentation Inspection and quality control Design Measurement by acoustic techniques scan pattern flaw shape image annotation tools Engineering materials data visualisation probe parameters flaw size advanced software environment image reconstruction flaw orientation Nondestructive testing: acoustic methods Computing devices and techniques ultrasonic imaging software tools computerised instrumentation automatic test software NDT data processing Sonic and ultrasonic applications

来源：评论

学校读者我要写书评

暂无评论

Automatic two-stage IR and MMW image registration algorithm for concealed weapons detection

引用

IEE PROCEEDINGS-vision image AND SIGNAL processing 2001年第4期148卷 209-216页

作者： Chen, HM Varshney, PK Syracuse Univ Dept Elect Engn & Comp Sci Syracuse NY 13244 USA

A two-stage registration scheme for the concealed weapons detection (CWD) problem is developed. The goal is to automatically register images taken simultaneously from two different (infrared (IR) and millimetre wave (MMW)) but parallel sensors whose lines of sight (LOS) are close to each other. The purpose of the first stage is to register the images coarsely. A feature-based image registration algorithm based on human body silhouettes is developed at this stage. The pose parameters found at this stage are used as the starting search point for the second stage of the registration algorithm. At the second stage, maximisation of the mutual information measure between IR and MMW images is performed to improve the pose parameters obtained at the first stage. Two-dimensional partial volume interpolation is employed to estimate the joint histogram that is needed to calculate mutual information. The simplex search algorithm is utilised to maximise the MI measure. In both stages, the distortion between the two images is assumed to be a rigid body transformation. Experimental results indicate that the automated two-stage registration algorithm performs fairly well.

关键词： automatic two-stage MMW image registration pose parameters feature-based image registration algorithm rigid body transformation millimetre wave imaging human body silhouettes feature extraction image distortion mutual information measure maximisation computer vision and image processing techniques search problems Other military topics Interpolation and function approximation (numerical analysis) 2D partial volume interpolation joint histogram estimation Optical, image and video signal processing weapons millimetre wave sensor infrared sensor image registration mutual information measure interpolation infrared imaging concealed weapons detection simplex search algorithm image sensors automatic two-stage IR image registration

来源：评论

学校读者我要写书评

暂无评论

Wavelet domain adaptive visible watermarking

引用

ELECTRONICS LETTERS 2001年第20期37卷 1219-1220页

作者： Hu, YJ Kwong, S City Univ Hong Kong Dept Comp Sci Kowloon Hong Kong Peoples R China

Pixel based scaling of a watermark image is of paramount importance to make the degree of marking applied variable according to the features of host images. Here, a wavelet domain visible watermarking is proposed. The scaling factors for the pixel based method are adaptively determined by the effect of luminance and local spatial characteristics.

关键词： message authentication image processing wavelet transforms wavelet domain watermarking Optical, image and video signal processing Integral transforms in numerical analysis copy protection computer vision and image processing techniques adaptive visible watermarking brightness Data security local spatial characteristics luminance pixel based scaling adaptive signal processing scaling factors

来源：评论

学校读者我要写书评

暂无评论

Row-oriented multiscale error diffusion technique for digital halftoning

引用

ELECTRONICS LETTERS 2001年第10期37卷 626-627页

作者： Chan, YH Cheung, SM Hong Kong Polytech Univ Dept Elect & Informat Sci Ctr Multimedia Signal Proc Kowloon Hong Kong Peoples R China

A digital halftoning method is proposed to diffuse error with a more symmetric error distribution by making use of the concept of multiscale error diffusion. The method can improve the diffusion performance by effectively reducing directional hysteresis. The diffusion is row-oriented rather than frame-oriented and hence can reduce the latency and computational effort as compared with conventional multiscale error diffusion schemes. This makes it possible for real-time applications.

关键词： image processing errors Optical, image and video signal processing real-time applications computer vision and image processing techniques digital halftoning method computational effort reduction symmetric error distribution directional hysteresis reduction real-time systems row-oriented multiscale error diffusion latency reduction diffusion performance improvement

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：