最新刊期
卷 33 ， 期 1 ， 2005
- 摘要：Based on the scenario that the number of wavelengths may be fixed by upgrading the WDM metro ring networks,this paper proposes a new WDM slotted-ring architecture with nodes equipped with one fixed transmitter and a set of fixed receivers.A detailed design and analysis of node architecture and MAC protocol,which aims at achieving fairness among the nodes and efficient bandwidth utilization,is given.It is shown through theoretical analysis and simulation results how the proposed architecture and MAC protocol can achieve a good throughput,queuing delay and packet loss probability.In the case of a large number of wavelengths,or if the number of wavelengths may also increase by upgrading the networks,this paper further proposes an original design method:employing one fixed transmitter and a set of tunable receivers that can only be tuned among partial continuous wavelengths,we show this method can achieve a good tradeoff in terms of performance metrics such as network's throughput,cost and implementing complexity.关键词：WDM;slotted metro ring networks;node architecture;MAC protocol2|920|0更新时间：2025-07-16
- 摘要：A new shape-based feature vector,symmetrical edge orientation histogram,for description of main roads in higher resolution aerial images is presented.Based on the topology of edge pixels in image,the proposed feature vector describes the major shape properties of images preferably,and performs invariant with respect to translation,rotation,scaling and illumination variations.Experimental results based on the fuzzy c-mean clustering algorithm show that,the proposed new feature vector gives a good solution for description of main roads in higher resolution aerial images,and can be used to extract seeds of main roads efficiently.关键词：main roads;symmetrical edge orientation histogram;invariance;fuzzy C-mean clustering2|1162|5更新时间：2025-07-16
- 摘要：With the increase of k,the k-error linear complexity will decrease to 0 from the value of the linear complexity of the sequences.For the binary sequences whose period is a power of 2,a relationship between the linear complexity and k-error linear complexity is discussed by Kurosawa,which indicates the least value of the positive integer k such that the k-error linear complexity less than linear complexity.In this paper,using the Hamming weight of polynomials,the least k is given such that the k-error linear complexity decreased again.关键词：stream cipher;linear complexity;k-error linear complexity2|1019|4更新时间：2025-07-16
- 摘要：One of the key techniques of Resilient Packet Ring (RPR) is ring distributed fairness algorithm.While some deficiencies exist in the fairness algorithm recommended by current draft standard of RPR (IEEE802.17 draft),such as long convergence time of fairness algorithm in high-speed RPR network and serious throughput oscillation caused by unbalanced traffic flow.This paper proposes a new fairness algorithm to solve these problems.The simulation results show that this algorithm not only solves the unbalanced traffic problem but also controls fairly the bandwidth allocation among stations.关键词：distributed fairness algorithm;resilient packet ring;unbalanced traffic flow;virtual destination queue2|996|2更新时间：2025-07-16
- 摘要：Based on the characteristics of tML and message queue,the tML data modeling of tested entity,test configure and test procedure are discussed,then conformance test methodology of network management based on tML/message queue is proposed,the network management interface test system that support the testing method is designed and implemented.关键词：XML;tML;DTD;schema;ICS;conformance test;message queue2|1041|1更新时间：2025-07-16
- 摘要：The BSAC (buffered S-ALOHA CDMA) protocol that applies to the Ad Hoc Wireless LANs is analyzed,and its analytical model is first proposed by Markovian chain approach in this paper.The analytical model uses two Markovian chains;one is for the M/M/1/k queuing model in the individual node,and another is for the number of the busy nodes in whole networks.Two Markovian chains are connected by the idle probability of queue.The effect which the analytical model's input parameters of throughput,delay and times of failure to deliver has on its performance metric of spreading gain,queue size and maximum allowable number of retransmissions is analyzed.The throughput bound of the B-SAC protocol is given.Besides,the delay-capture technology is introduced to greatly decrease the probability of collision of packets and improve the throughput by averagely 29.1% and improve the maximum throughput by 20.8% compared with the pure BSAC protocol and close to theoretical bound.关键词：Ad Hoc network;BSAC protocol;performance analysis;wireless LANs2|1176|7更新时间：2025-07-16
- 摘要：By examining the relationship between the minimum bit error rate (MBER),minimum mean square error (MMSE) and the constrained minimum mean output energy (MMOE),we resolve the interference suppressor optimized in the MBER sense into the optimum suppressor in the MMSE criterion and the constrained MMOE criterion which lend themselves to adaptive implementation more readily than the MBER suppressor.This paper addresses the recursive least squares (RLS) algorithm and the blind RLS (BRLS) algorithm without known desire signal.The suppressed effect of the BRLS algorithm is shown to be significantly inferior to the RLS algorithm with known data sequences.This paper proposes the scheme of combining RLS with BRLS to solve the interference suppression in time-varying environment.关键词：spread spectrum;minimum bit error rate (MBER) criterion;minimum mean square error (MMSE) criterion;minimum mean output energy (MMOE) criterion;interference suppression;recursive least squares (RLS) algorithm2|1014|3更新时间：2025-07-16
- 摘要：Many secure operating systems have some privileged processes or trusted processes which are always at risk of being hijacked by various attacks such as the buffer overflow attack.Once they are hijacked,the security of the whole system would be damaged.In this paper,a multi-protection domains process model is described which provides fine-grained kernel level protection for codes and data within process address space.The fine-grained internal protection of process can effectively prevent attackers from hijacking the whole process by damaging the process's data or codes.This paper offers two designs for this model and a prototype implementation of one of them.关键词：protection domain;access control;computer security;operating system2|892|3更新时间：2025-07-16
- 摘要：This paper analyzes and simulates the performance of irregular low density parity check (LDPC) codes on Rician fading channels and the others,and modifies BP decoding algorithm,proves the symmetry and shows the stability conditions on Rician channels,calculates the Shannon limit of Rician channels.Using Visual C+ + we simulate the performance with code word length N=3072 and 49152.The simulation results indicate that when N=49152,code rate R=1/3,the distance from Shannon's limit are 0.67dB,0.72dB and 0.91dB for AWGN,Rician and Raylrigh channels,respectively,LDPC codes having nice interleaving performance and anti-fading capability,and better performance of LDPC than Turbo codes in some area of SNR.Therefore the performance of LDPC codes is also very effective on all kind of channels,including Rician channels.关键词：LDPC;fading channel;RICIAN channels4|946|2更新时间：2025-07-16
- 摘要：A multipoint videoconferencing system is composed of four main components that are user interface,codecs,conferencing control and media transmission architecture.Among them,the media transmission architecture is most critical for a videoconferencing system.Traditional methods have many drawbacks such as high network resource overhead,heavy burden on terminals,low scalability and complicated control.This paper proposes a principle for design of videoconferencing,which makes the system simple,robust,feasible and scalable.According to the principle,a new model of multipoint videoconferencing based on multiple source-specific multicast trees is given.This model leads to simplifying design of the videoconferencing,reducing the overhead of networking resources and rising scalability.The paper introduces the evaluation method for transmission architectures,comparison of three types of traditional structures,the new transmission model and a practical videoconferencing developed by the anthers.关键词：videoconferencing;transmission model;performance evaluation;multicast;realization2|1080|2更新时间：2025-07-16
- 摘要：For real industrial processes in which systems are multi-input multi-output (MIMO),nonlinear and large operating range,a new multi-model modeling approach is presented in this paper.Firstly,a set of scheduling variables is partitioned into c subsets by Satisfactory Fuzzy c-mean Clustering algorithm,then the multi-model system is identified by the identification algorithm based on weighted performance function.The resulted model can obtain good trade-off in terms of global fitting and local interpretation.For each local model,its valid area is got as well.The result of application with the modeling approach to typical pH process illustrates the performance of the proposed algorithm.关键词：multi-model;nonlinear system;fuzzy clustering;local model networks2|1729|16更新时间：2025-07-16
- 摘要：This paper proposes a novel image retrieval method integrating image region information and the corresponding texture features.Firstly,the method extracts the dominant color of each image block to search the color-connected regions in the image according to a new definition of correlated color.Afterwards,the texture features corresponding to each color-connected region are computed and represented as color co-occurrence matrices,for which a specific similarity measurement is designed to retrieve images based on their contents.Experimental results have shown that the proposed method has sound and robust retrieval performance by integrating color composition and color spatial information into image texture descriptors.关键词：content-based image retrieval;co-occurrence matrix;image texture;dominant color;color connectivity;feature extraction2|1586|5更新时间：2025-07-16
- 摘要：A probability model for adaptive image denoising based on the wavelet transform is proposed.The new model includes an interscale model and an intrascale model.Firstly,we use the interscale model to classify the coefficients into two classes:significant coefficients and insignificant coefficients.Secondly,the maximum a posteriori (MAP) estimator based on the intrascale model is used to restore the noisy wavelet image coefficients.The same model can be applied to the complex wavelet domain.Experimental results and analysis are given to demonstrate the validity and effectiveness of the proposed model.关键词：wavelet transform;image denoising;complex wavelet transform (CWT);maximum a posteriori (MAP)2|1271|4更新时间：2025-07-16
- 摘要：This paper proposes a totally new method to combine the state space model with cross-high-order cumulant,in another word,it is a hankel matrix decomposition method of cross-high-order cumulant based on the state space model of harmonic retrieval.The method shows clearly the substance of harmonic retrieval problem and takes fully advantage of flexibility and convenience of the state space model.It also proposes a new way to harmonic retrieval problem and deduces a high precision algorithm of shot date system.The simulations have showed that the algorithm in this paper is much better than the Esprit methods of auto-high-order cumulant in identification and stability of the spectral estimation,and its ability to overcome disturbance is also better.The method has lower SNR than auto-high-order cumulant methods.关键词：cross-high-order cumulant;harmonic retrieval;state-space model2|877|4更新时间：2025-07-16
- 摘要：The minimal fuzzy partition,completeness and distinguishability of fuzzy partition,and consistency of rule are defined,with further analysis on Interpretability.In an attempt to develop interpretable fuzzy systems,a systematic design paradigm is proposed using evolution strategy for mixed parameter optimization.The proposed approach is applied to the design of fuzzy controller for a nonlinear plant.It is verified that the interpretable fuzzy system works very well,especially when the priori Knowledge are insufficient.关键词：fuzzy system;evolution strategy;interpretability;minimal fuzzy partition;completeness and distinguishability;consistency2|1034|1更新时间：2025-07-16
- 摘要：The direct least mean p-norm (DLMP) algorithm is a robust algorithm for estimating latency changes of evoked potential (EP) signals under both Guassian and the fractional lower orderα-stable noise conditions.Based on the fractional lower order statistics theory,the deterministic averaging method and two lemmas introduced and proved,this paper gives an analysis of the convergence property of the DLMP algorithm theoretically.The results of the analysis indicate that,if the EP latency change is an integer multiple of the sampling interval,the DLMP algorithm gives an unbiased estimate of the latency change;otherwise,the algorithm yields an estimate which differs from the true latency change by at most half of a sampling interval.关键词：direct least mean p-norm (DLMP) algorithm;α-stable process;fractional lower order statistics;deterministic averaging2|729|1更新时间：2025-07-16
- 摘要：With the exponential growth of biological data,there exist several challenges to effectively using such information for further research.Biological data are often complex,heterogeneous,hierarchical and dynamic,and may need to be integrated.We developed a software system,namely BioAgent,based on Multi-Agent system and XML technology for data integration,querying and customization.BioAgent consists of Information Extraction Agent,Intelligent Integration Agent,User Interface Agent and Information Customized Agent.We also developed a database of variants located on several levels based on BioAgent system.关键词：bioinformatics;data integration;XML;multi-agent2|1179|1更新时间：2025-07-16
- 摘要：SOM key exchange protocol and QV key exchange protocol were based on an elliptic curve En(a,b) over the ring Zn with a point G of order Mn=lcm{# Ep(a,b),# Eq(a,b)},where n=pq and p,q are odd primes.They pointed out that such a base point G exists if Ep(a,b) and Eq(a,b) are both cyclic groups.This restricts the choice of elliptic curves used to implement their protocols.In this paper we propose a necessary and sufficient condition under which En(a,b) has a point of order Mn=lcm{# Ep(a,b),# Eq(a,b)} and show by an example that En(a,b) may have a point G of order Mn even if Ep(a,b) is a cyclic group and Eq(a,b) is not.Our generalization makes it possible to choose more elliptic curves to establish key exchange protocol.And we give a new three or more users key exchange protocol with a point of order lcm{n1,m1} as base point,where n1,m1 are respectively the order of the maximal cyclic subgroups of Ep(a,b) and Eq(a,b).关键词：key exchange protocol;ring Zn;elliptic curves over Zn2|1201|8更新时间：2025-07-16
- 摘要：On the basis of the Kim-like's proxy multi-signature scheme,we propose an improved proxy multi-signature scheme,which resolves two problems in the Kim-like's proxy multi-signature scheme:(1)Security,anyone of the multi-original signers can forge a valid proxy multi-signature for any message.(2)Efficiency,the size of the proxy multi-signature and the efficiency of checking whether it is avail are dependent on the number of the original signers.关键词：proxy signature;multi-signature;proxy multi-signature;security;high efficiency2|884|5更新时间：2025-07-16
- 摘要：It is an important problem that how can continue to function correctly and to provide the intended services to legitimate user in a timely manner even in the face of an attack.An intrusion tolerant architecture,which is based on role-based access control scheme,is proposed in this paper.Our method is built upon the analysis of intrusion effects rather than intrusion causes.The characteristics,model and components of intrusion tolerant architecture are discussed in detail.In the distributed network computing environment,utilized the strategy of role-based access control,the intrusion tolerant mechanism is expounded from role-administer server,role pretending,data server and application server.The presented intrusion tolerant architecture guarantees the security and availability of the protected server,which enhances intrusion tolerant ability of server.关键词：intrusion tolerant;access control;role;information security2|1291|9更新时间：2025-07-16
- 摘要：This paper first gives the notion about distributed cryptographic protocol with distributed characteristics of space and time.Then research distributed cryptographic protocol based on the notion.For an instance,we use proactive security in an distributed key distribution system only with distributed characteristic of space and give a distributed protocol against mobile adversary.This paper enlarges research field of distributed cryptographic protocol.At last,this paper proves the security of distributed random key distribution protocol based on the probability space.关键词：distributed cryptographic;sharing secret;random session key;mobile adversary;probability space2|875|0更新时间：2025-07-16
- 摘要：This paper proposes a novel utterance verification (UV) algorithm based on model-distance matrix.It gives the definition of model-distance and training algorithm for model-distance matrix which is used to verify the recognition result.By using expanded model-distance matrix verification algorithm,it makes impossible to verify the result of a big keyword spotting system,and gets the same performance as on a small one.An updating algorithm to modify model-distance matrix is also introduced when vocabulary is modified.关键词：hidden Markov model (HMM);maximum likelihood (ML);utterance verification (UV);keyword spotting2|931|2更新时间：2025-07-16
- 摘要：Some theoretical problems such as the transitive relation of orthonormal wavelet packet basis at different scales,the transitive relation of wavelet packet decomposition coefficients at different scales,the statistical attributes of wavelet packet decomposition coefficients for white Gauss noise,and the properties of correlation function for orthonormal wavelet packet basis are investigated,and some theoretical results are obtained successfully,Simulation results show the validity of the obtained theory results.关键词：wavelet packet transform;wavelet packet basis;white gauss noise;correlation function2|855|1更新时间：2025-07-16
- 摘要：Robust stability of a class of time-delayed Hopfield neural network model with parameter perturbations is investigated.The sufficient condition of the asymptotic stability of equilibrium point is obtained by use of Lyapunov functional.By the properties of matrix norm and the theory of liner matrix inequality (LMI),two computable and verifiable corollaries can be derived.A method of estimating the domain of attraction of equilibrium point is given,and the effect of the domain of attraction to the associated memory is analyzed in details.The numerical samples have proved the effectiveness of the results.关键词：Hopfield neural networks;parameter perturbations;robust stability;LMI;domain of attraction2|696|1更新时间：2025-07-16
- 摘要：Basing on signal subspace principle and utilizing the simulated annealing algorithm,The paper provides an estimation method for estimation of mutual coupling coefficient among phased array with assistant signal sources in near field.Some simulation results demonstrate that this method is feasible,even with other unknown incident signals.关键词：phased array;mutual coupling;near field calibration;simulated annealing algorithm4|2906|9更新时间：2025-07-16
- 摘要：The eigenvalues of TEM Cell are solved with the matching of electric and magnetic field on the multiple virtual boundaries by vector partial differential operator theory and the property of TEM Cell is discussed.The dyadic Green's function has no singularity and can be transformed into scalar Green's function.The results computed by partial differential operator theory are compared with numerical results.关键词：vector partial differential operator;TEM cell;eigenvalues2|966|0更新时间：2025-07-16
- 摘要：A framework of reconstructing a superresolution video sequence from a low resolution video sequence is proposed in this paper.Under this framework,we discuss a superresolution restoration algorithm from a single frame based on regularized least mean square functional.Its iteration formula,convergence,convexity and the choice of parameters are thoroughly studied.We also present a registration algorithm based on weight matrices.The characteristics of motion compensation matrices and weight matrices are discussed in detail.Experimental results demonstrate the power of the proposed method.关键词：video processing;superresolution reconstruction;Tikhonov regularization;motion compensation;image registration2|1245|6更新时间：2025-07-16
- 摘要：In this paper,the Cramer-Rao low bound (CRLB) for mobile station location based on time of arrival (TOA) in CDMA system is obtained.The detailed deduction and the expression of CRLB are showed and the physical interpretation is discussed.From the CRLB,the conclusion that the CRLB for location is not related with user's numbers is obtained.A new time delay estimation algorithm which can restrain muti-user interferes (MUI) is raised.The method explains the CRLB more sufficiently.The paper discusses some numerical examples based on simulation experiments.关键词：CDMA;MUI;location;TOA;time delay estimation;CRLB2|1072|1更新时间：2025-07-16
- 摘要：The optimal solution for the conventional multi-user detection is a NP hard problem.The quantum multi-user detection (QMUD),which based on quantum detection,can solve this problem efficiently.The procedure of the optimal QMUD under quantum Bayes cost is given in this paper.Performance comparisons with classical techniques show an improvement when quantum detection is employed.关键词：multi-user detection;symbol error probability rate;quantum state;quantum detection2|1038|1更新时间：2025-07-16
- 摘要：The IEEE 802.11 is used to support asynchronous and time bounded delivery of radio data packets.The primary MAC technique of 802.11 is called distributed coordination Function(DCF),which is based on Carrier Sense Multiple Access with Collision Avoidance(CSMA/CA) mechanism with binary slotted exponential backoff.The basic access and the RTS/CTS access mechanisms are the packet transmission schemes employed by DCF.There have been few models to analysis the combination of the basic and RTS/CTS scheme until now.In this paper,we propose an analytical model to evaluate the throughput and delay performance of a combination mechanism,in the assumption that the distribution function of the packet length is a general function f(x).The accuracy of our model is validated by elaborate simulations.关键词：WLAN;performance evaluation;performance model;CSMA/CA;DCF2|1135|3更新时间：2025-07-16
- 摘要：User Interest Spectrum (UIS) is the foundation of UCL(Uniform Content Locator)agent and active service in the broadcasting grid,which has many characteristics itself.UCL application mechanisms in the grid terminal are studied,such as the UCL resolution,the controlling of data stream,and the UCL application mechanism.At the same time,the method to build the UIS is put forward.Meanwhile,the medium framework and the ontological one of information are analyzed,including the characteristics,interchange and the effect of establishing the user profiles.Laboratory simulations demonstrate its feasibility and validity in the broadcasting grid.关键词：grid;broadcast;user profile;semantic web;agent2|999|1更新时间：2025-07-16
- 摘要：Reed-Muller code is applied to TFCI coding in 3GPP,but the decoding algorithm is not concretely explained in the technical report.Hence,it is deduced in detail in this paper,and two FHT(Fast Hadamard Transformation) methods are compared,what is more,some excellence and inadequacies of 3GPP protocol design are pointed out.In addition,the TFCI coding meets the test of computer simulation.关键词：Reed-Muller coding;3GPP;fast Hadamard transformation(FHT);TFCI2|2653|1更新时间：2025-07-16
- 摘要：This paper introduces the design and implementation of an EFM/EFM+ demodulator,which is used in the DVD servo control system.The demodulator translates the 14-bit CD data and the 16-bit DVD data into 8-bit data.The final solution has been given by analyzing the principle and the practical application.The demodulator has been implemented in Verilog Hardware Description language.And the simulation result and the FPGA verification indicate that the design is successful.关键词：EFM/EFM+;demodulator;verilog;functional simulation;FPGA verification2|1068|0更新时间：2025-07-16
- 摘要：Based on the different statistical characteristics of Doppler ultrasound blood flow signals and wall clutter signals,the non-uniform sampling and cubic spline reconstruction are applied to the mixed signals to obtain the wall signals,and consequently blood signals.This novel method,together with the traditional high-pass filtering method,is applied to both computer simulated Doppler ultrasound signals and collected human carotid Doppler ultrasound signals.The comparison experiments indicate that the proposed method can remove wall clutter signals with preservation of low frequency blood components,thus is suitable for the separation of the wall and blood signals in Doppler ultrasound systems.关键词：Doppler ultrasound;non-uniform sampling;cubic spline;reconstruction2|1080|1更新时间：2025-07-16
- 摘要：Human has the ability to attend to a single interested speech in a noised condition and this ability can be improved in the presence of binaural cues.In this paper a speech separation method is presented based on sound localization and auditory masking effect.By two important parameters-the interaural time differences (ITD) and interaural intensity differences (IID)-we estimate the binary masking coefficients in corresponding time-frequency regions.The coefficients are helpful of speech separation by holding interested signal and reducing noise signal.Experiments indicate that the approach described here is efficient not only for voiced speech but also for unvoiced speech and it has more extensive applications than pitch-based speech separation algorithms.关键词：interaural time differences;interaural intensity differences;sound localization;speech separation;masking effect2|1646|7更新时间：2025-07-16
- 摘要：Aim at automatic registration of temporal images,multispectral images and multisensor optical images,a feature-based automatic image registration algorithm is described in this paper.On the basis of point mapping techniques,it deals with the registration of images with affine geometric distortion.First,with edge detection and a postprocess,the closed boundary regions in both images are extracted.Next,the correspondence of closed boundary regions is developed by chain-code correlation and invariant moments.And the center of gravity in the correspondent regions is used as matching points.After a global consistency check is applied to the matching points,the primitive control points are acquired.Finally,initial transformation parameters are estimated based on the primitive control points.The number of control points is added by salient point chip correlation matching in the reference image and the transformed image.An iterative refined parameter process is devised to improve the accuracy of registration.Experimental results with various kinds of remote sensing images have verified high accuracy and reliability this algorithm.关键词：remote sensing image registration;closed bounder;consistency check;control points;iterative refined parameters2|2466|17更新时间：2025-07-16
- 摘要：This paper gives a formal analysis on the authenticated key exchange protocol based on password using the theory of the strand space model.We introduce the ability on modeling the DH problem and the guessing attack,and then give a proof on secrecy of the password,authentication and the secrecy of the session key of the simplified DH-EKE protocol.Based on the analysis,we propose a basic condition of the key exchange protocol based on password on resisting the guessing attack.Extending the method to the three-party case,a necessary condition is concluded to guarantee the security of the three-party authenticated key exchange protocol based on the pure password.关键词：key exchange protocol;guessing attack;strand space;DH key agreement2|1849|11更新时间：2025-07-16
- 摘要：Non-repudiation is a key property of electronic commerce protocols,and its formal analysis has draw people's attention.This paper analyzes a non-repudiation protocol using formal methods,and modifies some flaws of the protocol.关键词：non-repudiation protocol;formal analysis;SVO logic2|1105|7更新时间：2025-07-16
- 摘要：The determination of the algebraic representations of coordinates of finite field elements with the elements themselves as the variables,which is a new property of finite fields,is investigated.Based on the partition of equivalent classes,the resolving of a linear system of equations and the calculation of the dual basis of the standard basis,three methodologies are presented.With those results,we have successfully given an essential explanation to the simplicity of the algebraic representation of Rijndael S-box and provided a direct proof to the equivalence between any two coordinate functions of Rijndael S-box.关键词：equivalent class;linear transformation;trace;dual basis;Rijndael;S-box2|851|0更新时间：2025-07-16
- 摘要：By looking up pixels of image sequence as those moving gas molecules,a novel concept,image temperature,has been proposed to describe 2-D image motion during video analysis.The idea is motivated by the well-known Maxwell-Boltzman Distribution Law in the gas dynamic theories.The Energy Flow Field (EFF) estimated by the image temperature presents more accurate motion vectors than the traditional Optical Flow Field (OFF).When the information of EFF is applied for video segmentation,the experimental results show that EFF provides better performance.关键词：shot detection;motion estimation;image temperature field;EFF;OFF2|935|1更新时间：2025-07-16
- 摘要：Segmentation of multiple moving object in an image sequence is one of the most challenging problems in image processing due to the complexity of its motion.This paper presents a novel multiple object segmentation algorithm based on spatial-temporal curve evolution.First,According to the dissimilar characteristic of the intra-frame and inter-frame (Spatial and Temporal) information,a joint energy model is proposed with global and local features,thus,a curve evolution equation could be achieved based on the method of level sets.Then,an initial object model is achieved with the difference between two successive frames,multiple objects are tracked and extracted with spatio-temporal curve evolution.Finally,while the occlusion is emerged due to multiple object overlapping motion,the objects could be segmented using Bayes classification for minimum error.The experiment results show that the algorithm is effective.关键词：multiple video object segmentation;spatio-temporal curve evolution;occlusion processing.2|1062|2更新时间：2025-07-16
- 摘要：In the applications of GIS,the attribute data of sample point isn't often precise value,but an interval range.The modeling,analyzing and reasoning of this kind of data has gained more and more attention from researchers.The method describes the fuzzy regions determined by indeterminate attribute value using interval valued fuzzy sets.Based on the operation property of interval value and interval valued fuzzy sets,the analyzing model of topological relations between fuzzy regions is proposed.It improves the original topological relations model that use traditional fuzzy set and cut-set.The analysis result accords with the cognitive principle of people and can be used to reasoning and make decision.It can efficiently judge the topological relations between fuzzy regions determined by interval-valued attribute and it is valuable in the fields such as GIS,geography and spatial databases.2|1222|11更新时间：2025-07-16
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