期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到6篇文章
< 1 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Target classification using SIFT sequence scale invariants 认领 引用 被引量：11
1
作者 Xufeng Zhu Caiwen Ma +1 位作者 Bo Liu Xiaoqian Cao 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2012年第5期633-639,共7页
On the basis of scale invariant feature transform（SIFT） descriptors,a novel kind of local invariants based on SIFT sequence scale（SIFT-SS） is proposed and applied to target classification.First of all,the merits o... On the basis of scale invariant feature transform（SIFT） descriptors,a novel kind of local invariants based on SIFT sequence scale（SIFT-SS） is proposed and applied to target classification.First of all,the merits of using an SIFT algorithm for target classification are discussed.Secondly,the scales of SIFT descriptors are sorted by descending as SIFT-SS,which is sent to a support vector machine（SVM） with radial based function（RBF） kernel in order to train SVM classifier,which will be used for achieving target classification.Experimental results indicate that the SIFT-SS algorithm is efficient for target classification and can obtain a higher recognition rate than affine moment invariants（AMI） and multi-scale auto-convolution（MSA） in some complex situations,such as the situation with the existence of noises and occlusions.Moreover,the computational time of SIFT-SS is shorter than MSA and longer than AMI. 展开更多
关键词 target classification scale invariant feature transform descriptors sequence scale support vector machine
暂未订购 下载PDF
Strategic Analysis of Dynamic Detection and Tracking Methods for Autonomous Vehicles 认领 引用
2
作者 Chenhe Kang 《Journal of Electronic Research and Application》 2026年第6期125-130,共6页
To solve the problem of perception failure due to vehicle occlusion in urban areas,this paper will review and analyze many dynamic detection and tracking methods proposed in recent years in detail.The main idea of the... To solve the problem of perception failure due to vehicle occlusion in urban areas,this paper will review and analyze many dynamic detection and tracking methods proposed in recent years in detail.The main idea of the first representative study is to use laser beams and geometric figures for rigid matching.They are very effective in open areas,but because there is no information on the surface,the algorithm cannot work when there is occlusion.Earlier,researchers put forward a soft-assignment method by building a“four-rectangle measurement model”,and it was found that probabilistic modeling is better than binary matching;now,a laser ray does not need to hit an object,and the matching probability of local sparse point clouds can be calculated.A good way to improve the efficiency of tracking is the scaled sequence algorithm.The first problem of this algorithm is that it involves a high-dimensional state search.The detection rate of severe occlusion in the KITTI dataset for the new model is higher than that of traditional methods.As shown in the above case,although this method is relatively stable in the face of missing values,it has some defects;that is,it is too sensitive to the initial prior and may be trapped in a local optimum under difficult conditions.Due to the shortcomings of the previous models,such as fixed dimensions and an inability to address all kinds of traffic flexibly,it is hoped that future research will be based on multi-scale adaptive geometric models to achieve all-weather sensing and all-conditions operation.Vehicle occlusion,Likelihood Field Model,Scaling sequence algorithm,self-motion compensation. 展开更多
关键词 Likelihood field model Four-rectangle measurement model Scaling sequence algorithm Adaptive multiscale modeling
暂未订购 下载PDF
Novel approaches to the multiscalar display of vector data 认领 引用
3
作者 NIU Fangqu CHENG Changxiu 《Geo-Spatial Information Science》 EI 2012年第4期251-261,共11页
There are many challenges to achieving quality multiscalar displays of vector data in geographical information system(GIS).Acknowledging and making use of the differences between traditional cartographic generalizatio... There are many challenges to achieving quality multiscalar displays of vector data in geographical information system(GIS).Acknowledging and making use of the differences between traditional cartographic generalization and multiscalar display in GIS,this paper focuses on novel approaches to the definition of small objects and the establishment of scale sequence.The ease of implementation and efficacy of the solutions proposed are exemplified and analyzed.Possibilities for further research into the multiscalar display of vector data in GIS are thereby suggested. 展开更多
关键词 data generalization multiscale GIS generalization rectangle scale sequence
暂未订购 下载PDF
Scale characters analysis for gully structure in the watersheds of loess landforms based on digital elevation models 认领 引用 被引量：6
4
作者 Hongchun ZHU Yipeng ZHAO Haiying LIU 《Frontiers of Earth Science》 SCIE CSCD 2018年第2期431-443,共13页
Scale is the basic attribute for expressing anddescribing spatial entity and phenomena. It offerstheoretical significance in the study of gully structureinformation, variable characteristics of watershed mor-phology, ... Scale is the basic attribute for expressing anddescribing spatial entity and phenomena. It offerstheoretical significance in the study of gully structureinformation, variable characteristics of watershed mor-phology, and development evolution at different scales.This research selected five different areas in China＇s LoessPlateau as the experimental region and used DEM data atdifferent scales as the experimental data. First, the changerule of the characteristic parameters of the data at differentscales was analyzed. The watershed structure informationdid not change along with a change in the data scale. Thiscondition was proven by selecting indices of gullybifurcation ratio and fractal dimension as characteristicparameters of watershed structure information. Then, thechange rule of the characteristic parameters of gullystructure with different analysis scales was analyzed bysetting the scale sequence of analysis at the extractiongully. The gully structure of the watershed changed withvariations in the analysis scale, and the change rule wasobvious when the gully level changed. Finally, the changerule of the characteristic parameters of the gully structure atdifferent areas was analyzed. The gully fractal dimensionshowed a significant numerical difference in differentareas, whereas the variation of the gully branch ratio wassmall. The change rule indicated that the developmentdegree of the gully obviously varied in different regions,but the morphological structure was basically similar. 展开更多
关键词 watershed scale features gully structure bifurcation ratio fractal dimension scale sequence
暂未订购 下载PDF
The Spectrum Sequences of Periodic Frame Multiresolution Analysis 认领 引用
5
作者 Yun Zhang LI Qiao Fang LIAN 《Acta Mathematica Sinica,English Series》 SCIE 2009年第3期403-418,共16页
The periodic multiresolution analysis （PMRA） and the periodic frame multiresolution analysis （PFMRA） provide a general recipe for the construction of periodic wavelets and periodic wavelet frames, respectively. Th... The periodic multiresolution analysis （PMRA） and the periodic frame multiresolution analysis （PFMRA） provide a general recipe for the construction of periodic wavelets and periodic wavelet frames, respectively. This paper addresses PFMRAs by the introduction of the notion of spectrum sequence. In terms of spectrum sequences, the scaling function sequences generating a normalized PFMRA are characterized; a characterization of the spectrum sequences of PFMRAs is obtained, which provides a method to construct PFMRAs since its proof is constructive; a necessary and sufficient condition for a PFMRA to admit a single wavelet frame sequence is obtained; a necessary and sufficient condition for a PFMRA to be contained in a given PMRA is also obtained. What is more, it is proved that an arbitrary PFMRA must be contained in some PMRA. In the meanwhile, some examples are provided to illustrate the general theory. 展开更多
关键词 PFMRA periodic wavelet frame scaling function sequence spectrum spectrum sequence
暂未订购 下载PDF
Characterization of Periodic Multiresolution Analysis and an Application 认领 引用
6
作者 Li Dengfeng Peng Silong, Institute of Mathematics, Academia Sinica, Beijing 100080, China 《Acta Mathematica Sinica,English Series》 SCIE 1998年第4期547-554,共8页
In this paper, we study the properties of periodic multiresolution analysis, and present a complete characterization of the scaling function sequence, which enables us to construct a new scaling function sequence from... In this paper, we study the properties of periodic multiresolution analysis, and present a complete characterization of the scaling function sequence, which enables us to construct a new scaling function sequence from a given one. An application of the main results is given at the end. 展开更多
关键词 Wavelet Periodic multiresolution analysis Scaling function sequence
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈