最新刊期
卷 32 ， 期 1 ， 2004
- 摘要：According to the Mobile IP mobility management scheme proposed by IETF,a mobile host must update its home agent and correspondent hosts whenever it moves from a subnet to another.This will result in the high binding and delivery costs in the networks.In this paper,we present a new mobility management scheme,which can reduce the binding and delivery costs and improve the performance of the network by detecting local movement and home movement to decrease the number of binding and updating messages sent to its home agent and correspondent hosts,on the base of the current network architecture.关键词：Mobile IPv6;mobility management;DMR(delivery/movement)2|829|3更新时间：2025-07-16
- 摘要：The filtering method is the key procedure in the preprocessing for fingerprints image.In the paper,a new algorithm of fingerprint images based on the filtering of the ridge direction is introduced.First,an improvement of extreme value filtering is presented and then,an algorithm of fingerprint images based on the filtering of the ridge direction is discussed.Our experiments show that method is satisfactory.关键词：fingerprint images;filtering;ridge direction2|923|7更新时间：2025-07-16
- 摘要：Robustness is one of the most important issues in watermarking.In this paper,a blind image watermarking algorithm robust against affine transformation is proposed.This algorithm improves the robustness in three aspects:the embedding strategy,the watermark structure and the synchronization of the watermark.In the algorithm,the spread-spectrum-based watermark with a training sequence are embedded in the coeffcients of LL3 subband in DWT domain while a template is embedded in the middle frequency components in the DFT domain.In watermark extraction,we detect the template in the possibly corrupted watermarked image to obtain the parameters of geometric attacks and recover the image back to its original shape.Then we perform translation synchronization in the DWT domain by using the training sequence and extract the watermark.With the proposed algorithm,we hide a character string with 44 characters (264 bits) in a 512×512×8 image.Compared with other watermarking algorithms reported in the literature,the watermark thus generated is more robust,especially against geometric distortion,while having much higher bit rate.关键词：image watermarking;robustness;affine transformation;geometric attacks;template matching2|1163|6更新时间：2025-07-16
- 摘要：Given an undirected graph with weights on the vertices,the maximum weight clique problem is to find a subset of mutually adjacent vertices(i.e.,a clique) having the largest total weight.This problem is a generalization of the problem of finding the maximum cardinality clique of an unweighted graph.Owing to the maximum cardinality clique problem and the maximum weight clique problem of graphs to be NP-complete,there are no effective methods to solve these two problems.Doctor Adleman introduced firstly the DNA computing in 1994,with which the NP-complete problems are likely to be solved.This paper introduces the DNA solution to the Maximum Weight Clique Problem of an undirected graph based on the plasmoid.On the basis of Head T et al,the algorithm is an effective and feasible method.关键词：DNA computing;NP-complete problem;maximum weight clique4|1106|8更新时间：2025-07-16
- 摘要：Digital watermarking technology of video image is a hot topic in present watermarking researching area.In this paper,a new watermarking algorithm for video images is proposed.By operating the compressed video data-stream directly,we embed watermarking information into motion vectors according to the motion-vector feature,therefore,complete decoding and re-encoding are unnecessary.The proposed algorithm is simple and efficient.Moreover,watermark can be extracted blindly without original images.Compared with that of image reconstructed from un-watermarked video sequences,PSNRs of watermarked frames are reduced slightly.关键词：video watermarking;motion-vector feature;compressed domain;blind watermarking2|912|1更新时间：2025-07-16
- 摘要：Orthogonal moments have been successfully used in the field of pattern recognition and image analysis.However,due to its complexity,the problem of fast computation of orthogonal moments has not been well solved.In this paper,on the basis of representing images with blocks,we present two algorithms,cumulative method and integral method,for fast and effective computation of the two-dimensional Legendre moments.The numerical results show that the new algorithms can decrease the computational complexity and computation time significantly.关键词：Legendre moments;image block representation;fast algorithm2|798|3更新时间：2025-07-16
- 摘要：This paper discusses a kind of statistical feature based image interpolation method at first.Using the covariance matrix and covariance vector in low-resolution image,one can obtain the interpolation coefficients,which can adapt edge orientation.In order to employ statistical feature base interpolation in the area of color image interpolation,this paper present the following methods to increase the calculating speed:estimating the interpolation coefficients only based on Y image,and applying them to R,G,and B images interpolation simultaneously;For edge pixels,statistical feature based image interpolation method is exploited,while for non-edge pixels,we only use simple bilinear interpolation.This method can be called mixture interpolation.Benefit from these measures,one can get high calculating speed while keeping the image quality unchanged.The experiments show that this method is both effective for calculating speed and interpolated image quality.关键词：image interpolation;resolution;non-linear filter;color space;covariance feature2|1179|5更新时间：2025-07-16
- 摘要：An algorithm based on Gibbs random field model for the integration of spatial and temporal segmentation results is proposed in this paper for video object segmentation.The segmentation mask of each frame is modeled as a Gibbs random field.The field is initialized as the temporal segmentation result and the spatial segmentation is provided as an observed field of the image.Finally,the mask is gotten through integrating spatial and temporal segmentation results according to the restriction of Gibbs random field model.Experimental results show that the novel algorithm can avoid the overfull dependence on the accuracy of the spatial segmentation as the usual Ratio Method does.关键词：video object segmentation;Gibbs random field (GRF);spatio-temporal segmentation;iterated conditional modes2|781|2更新时间：2025-07-16
- 摘要：A simple and effective corner detection algorithm based on morphological and distance transform is proposed. In essence,the algorithm is different from the corner detection algorithm which is based on chain-code,oriented edge or morphology.It overcomes some bugs of former algorithms from basic principle.At last,some corner detection experiments of binary and intensity images are given.Experiments indicate that the algorithm overcomes some shortcomings of other algorithms and preserves their advantages.It is a simple,practical,effective corner detection algorithm.关键词：image processing;corners;mathematic morphology;distance transform2|1287|8更新时间：2025-07-16
- 摘要：In the paper,a new motion-object-based shape coding called CSSAS (curvature scale space adaptive arithmetic shape coding) is proposed.There are two coding modes,the intra and inter modes.In the intra mode,the modified CSS theory is used to extract feature points of the shape curve of arbitrary shape video object(VO) at different scales.All of the feature points are encoded by adaptive arithmetic encoding.In the inter mode,a CSSI-based (Curvature scales space image-based) motion compensation/estimation algorithm of arbitrary shape VO is proposed.The matched segments of shape are coded by using arc length index algorithm and the mismatched segments are coded by using intra CSSAS algorithm.Simulation results show that the proposed method is much better than CAE of MPEG-4 VM in coding efficiency (in inter mode,Dn≥threshold) and subjective quality for both intra and inter modes.关键词：MPEG-4;shape coding;CSS;CSSAS;CAE2|940|3更新时间：2025-07-16
- 摘要：In order to overcome the defects of the duration modeling of homogeneous HMM in speech recognition,a Duration Distribution Based HMM (DDBHMM) is proposed in this paper based on a formalized definition of a left-to-right inhomogeneous Markov model,which has been demonstrated that it can be identically defined by either the state duration or the state transition probabilities.The speaker independent continuous speech recognition experiments have shown that,by only modeling the state duration in DDBHMM,a significant improvement (17.8% error rate reduction ) has been achieved comparing with the classical HMM .The ideal properties of DDBHMM will give promise to many aspects of speech modeling,such as the modeling of the state duration,speed variation,speech discontinuity and the inter frame correlation.关键词：duration;speech recognition;DDBHMM2|2469|16更新时间：2025-07-16
- 摘要：We proposed a new method of Chinese automatic segmentation that can check all overlapping ambiguity in sentence. This algorithm is based on the principle of "Choose Longer Word". It solves the problem that the count of segmentation way is exponentially increasing with the sentence length,and provides a method to handle overlaying ambiguity and overlapping ambiguity separately. The time complexity of this algorithm is O(N),where N is the length of sentence. Its output can greatly decrease the computing cost of post processing.关键词：automatic segmentation;choose longer word2|1456|6更新时间：2025-07-16
- 摘要：Most Filtered-XLMS-based AANC algorithms employ an error path model to filter the input reference signals.The effectiveness of AANC algorithm for practical applications suffers in general from the inaccuracy of error path modeling.After the effect of two different modeling methods on the convergence of FLMS algorithm is analyzed,a more accurate method of error path modeling of a practical AANC system is presented.The modeling results for practically measured data show the effectiveness of the proposed modeling method.关键词：adaptive active noise control (AANC);filtered-XLMS algorithm;convergence analysis;modeling2|913|2更新时间：2025-07-16
- 摘要：In this paper,we propose a fair scheduling algorithm called CoSB-WFS (Class of Service Based Wireless Fair Scheduling) to support QoS demands of different classes of services in wireless networks.It uses CoS index to distinguish different application level services and can use different queueing strategies for each CoS.We propose a compensation strategy and a reallocation method in the algorithm to achieve wireless fair services.We build a simple model of the algorithm in OPNET and present simulation results to show the performance improvements.关键词：QoS (quarl quality of services);CoS (class of services);WFS(wireless fair scheduling)2|1602|2更新时间：2025-07-16
- 摘要：By analyzing preemptions of real-time tasks in embedded systems under preemptive EDF (Earliest Deadline First) schedule algorithm,we create a preemption model of periodic real-time tasks.This model describes relationship between overhead occurred by preemptions and the properties of real-time tasks,such as priorities,periods,execution times,deadlines,release times etc.It also shows the relationships among task's properties,preemption orders,schedule overheads and schedulibility.Underlying the model,this paper presents an improved preemptive EDF algorithm,which uses the release times as schedule criteria got by an optimization algorithm.The optimization algorithm is based on genetic algorithm and runs off-line on desktop computers.Using the algorithm can reduce the number of preemptions,change order of preemption,so that the schedule capacity and real-time performance of embedded systems are improved.And then the improved schedule algorithm underlying the model is evaluated by experiments.关键词：preemptive EDF;release time;Preemption model;real-time performance;embedded systems2|1844|6更新时间：2025-07-16
- 摘要：The Assured Services architecture relies on packet marking mechanism at the edge router,and queue management mechanism at the core router.Due to its self-adaptive congestion,TCP flows are much more sensitive to packet drops,especially to multiple drops,therefore when network congestion happened,the throughput of TCP flows is greatly influenced.We design a new marker called CASR3CM (Congestion Aware Single Rate-Three Color Marker).The simulation results indicate that the marker not only improves the throughput of AS TCP flow,the stability of the throughput,but also improves the fairness of bandwidth sharing between AS TCP flows.关键词：differentiated services;assured services;congestion;packet marking2|958|2更新时间：2025-07-16
- 摘要：A multicarrier direct-sequence code-division multiple access (MC-DS-CDMA) system,which employs an antenna array at the base-station,is introduced.A space-frequency blind adaptive algorithm (SFBA) based on maximum-signal-noise ratio (MSNR) principle is presented and the analysis of the performance of this algorithm is given.Neither the knowledge of the channel condition nor any training sequence is required.Using the characteristic of the CDMA signal,this algorithm can cancel the interferences and noise,and increase the SNR.The results of simulation show the feasibility,validity and resistance to near-far problem of this algorithm in Rayleigh fading channel.关键词：MC-DS-CDMA;MSNR;Rayleigh fading channel;beamforming2|721|0更新时间：2025-07-16
- 摘要：In this paper,a general analytical framework for system throughput performance of adaptive coded modulation is proposed.Each coded modulation scheme is assigned with a certain range of average channel signal to noise ratio (SNR) based on bit error rate (BER) performance of each fixed coded modulation scheme.With the method of Lagrange,the SNR switching thresholds for throughput maximization of adaptive system are derived and the average throughput performance of the adaptive system is obtained.It is shown in our numerical results that significant improvements of system throughput performance of the adaptive Turbo-coded MQAM modulation over adaptive MQAM modulation have been achieved and the throughput performance is insensitive to the instantaneous BER requirement.For the same average channel SNR in Nakagami channel,less improvement of the throughput performance is observed with the increase of m.关键词：coded modulation;adaptive coded modulation;adaptive modulation;fading channel;throughput2|849|0更新时间：2025-07-16
- 摘要：In this paper,the problem of frequency estimation of two-dimensional (2-D) harmonics in the presence of correlative multiplicative and additive noise is presented.We propose a 2-D cyclic statistic-based approach to this problem,and 2-D cyclic mean is employed to estimate frequency in nonzero mean multiplicative noise.A special 2-D slice of the sixth-order time-average moment spectrum is defined to estimate frequency in zero mean multiplicative and additive noise.The effectiveness of our methods is demonstrated through some simulation examples.2|1176|4更新时间：2025-07-16
- 摘要：We build a chaotic system which dynamic behavior is very sensitive to weak square wave signal,and then use the change of phase space track of this system to realize detection of the weak square wave signal from any colored noise background.In this paper,we proved the square wave signal's detection method and analyzed the influence for the chaotic detection from noise.The simulation experiments shows that chaotic detection system is very sensitive to square wave signal and have strong restrain ability to any colored noise with zero mean.关键词：duffing equation;chaotic oscillator;signal detection2|1541|30更新时间：2025-07-16
- 摘要：Traditional second order-based EP latency change detection methods usually degenerate under fractional lower order -stable noise conditions.This paper proposes a fractional lower order covariance based algorithm,which changes the noise contaminated EP signal into a finite second order moment process by a non-linear transform,and guarantees its convergence in the entire range of α∈(0,2],and obtains a high robustness and accuracy for latency change estimation.The paper also gives the theoretical analysis for the performance of AFLC and simulation and data analysis results.关键词：evoked potentials;latency change;α-stable distribution;fractional lower order moment2|1089|6更新时间：2025-07-16
- 摘要：The estimation accuracy for the cyclic time-delay estimator is discussed under the condition of white gaussian noise.Simulation results show that the simulation accuracy value is approximately the same as the theoretical one in the condition SNR＞-5dB,which indicates the exactness of the accuracy analysis.At the same time,under the condition of different background noise with WGN(White Gaussian Noise)and slowly time-variant WGN,simulation results based on biphase coding and quadriphase coding signals show that the cyclic estimator really performs better than the radiometor widely used in practice.关键词：cyclic estimator;time-delay estimation;accuracy analysis2|893|0更新时间：2025-07-16
- 摘要：Single-cycle time-delay estimator suffers from the dependence on the selection of different cycle frequencies,which restricts its practical usage.To solve the problem,multi-cycle time-delay estimation method is discussed.And the estimation accuracy for multi-cycle estimator is also given.Simulation results based on BPSK and QPSK signals with stationary noise and slowly time-variant noise show that estimation theoretical accuracy is just the same as the simulation one with high SNR (＞-6dB),and double-cycle estimator performs worse than tri-cycle estimator,but better than single-cycle estimator,which indicates the efficiency and robustness of the given method as well as the exactness of the accuracy analysis.关键词：cycle estimator;multi-cycle estimator;time-delay estimation;estimation accuracy2|1184|6更新时间：2025-07-16
- 摘要：Automatic generation of test data for a given path in a program is one of the elementary problems in software testing,the essence of which lies in the deriving and solving of system of constraints.The issue of how to solving nonlinear constraint is a hard problem in theory.In this paper,we classify the approaches of generation of test data for a given path into four categories:random,static,dynamic,and heuristic.The representative methods in each category are analyzed and compared.The direction of research is also explored.关键词：automatic generation of test data;program path;constraints solving;numerical optimization2|1977|30更新时间：2025-07-16
- 摘要：Digital watermarking is a technique for inserting information (the watermark) into digital multimedia,which can be later extracted or detected for a variety of purposes including identification or authentication purposes.Based on analysis of the past fragile watermark techniques,three new efficient fragile watermark techniques are proposed,benefiting from the good properties of chaos,including the ease of their generation,their sensitive dependence on their initial condition and noise like,thus a same image sub block can embed different information at the same location and resist Holliman's attack.The scheme can detect any modification made to the image and indicate the specific locations that have been modified,because any modification would be reflected in a corresponding error in the extracted watermark.关键词：robust watermarking;fragile watermarking;chaos system;content tampering resist2|1555|15更新时间：2025-07-16
- 摘要：A novel adaptive filter design technique is proposed in this paper according the theory of One-parameter Transformation Group.An algorithm for the convolution of this filter and an image is also given.The filter,after this parameter changes,can be represented in form of the linear combination of a fixed,finite set of basis filters.When this kind of filters are convoluted with a image in different orientations,positions and scales,the computing efficiency is improved remarkably.An example for edge-detection is given to demonstrate validity of this method.关键词：adaptive filter;one-parameter transformation group;steerable functions;edge-detection2|831|0更新时间：2025-07-16
- 摘要：Motion estimation plays an important part in the analysis of video sequences for the purposes of information extraction.In order to process video data effectively,camera motion extraction from compressed video is often required.In this paper,an effective global motion estimation algorithm based on the moving background derived from MPEG compressed data is presented.The algorithm uses the predictive error DC-image to extract the moving background of the current frame,and then exploits a new global motion estimation method based on a 6-parameters motion model to calculate the camera parameters.In the evaluation experiments,five video test sequences with global motions and three video sequences without global motions are used to test the proposed algorithm,and compared with an existing method.The experimental results show our algorithm can estimate global motion parameters more effectively and exhibit more robustness than the existing algorithm.关键词：camera motion;background estimation;MPEG video2|863|1更新时间：2025-07-16
- 摘要：Stochastic noises in ring laser gyro,which contain fractal noises and white noises,have poor effects on its' precision.And it is difficult to eliminate fractal noises using traditional method.In order to filter stochastic noises in ring laser gyro,two steps are adopted.First,utilizing special properties of fractal noises in wavelet transform domain,parameter estimation technology in wavelet transform domain is applied to obtain parameters of noises.Second,wavelet soft-threshold denoising method is employed to eliminate noises.Filtering results of a certain type of ring laser gyro show that parameter estimation and filtering based on wavelet analysis are efficient.关键词：fractal noises;ring laser gyro;wavelet transform;stochastic noise2|1180|6更新时间：2025-07-16
- 摘要：In this paper,we introduced several noise removing techniques in the wavelet domain,analyzed the properties of bilateral filtering.Following them,bilateral filtering in the wavelet domain was proposed.With this method,the properties of time-frequency localization and multiresolution of wavelets were used.At last,we demonstrated the efficient noise removing and sharpening of object boundaries and detailed structures by applying this image processing technique to different images.关键词：wavelets;filter;bilateral filter2|1575|8更新时间：2025-07-16
- 摘要：The signal to noise (SNR) of conventional sigma delta analog to digital converter (ADC) reduces with input signal strength.The existing concept of adaptive quantization is applied to the design of ADC to improve SNR with high dynamic range.An adaptive algorithm and its circuit implementation is proposed.Because of the error due to the circuit implementation,we also designed the error self-calibration circuit.Simulation results indicate that SNR can be nearly independent of the signal strength.关键词：sigma-delta A/D;adaptive;error self-calibration2|1013|1更新时间：2025-07-16
- 摘要：In this paper,we discussed the smoothing problem in target tracking and aerospace measurement.A novel model based on free node spline function is put forward to improve the design of the polynomial least square filter.Compared with a polynomial expression of trajectory,the spline expression of the trajectory can make the truncation error decrease greatly.Thus the trajectory parameter estimation accuracy is enhanced accordingly.Simulation results show that this method can improve the parameter estimation accuracy notably when target is maneuvering.关键词：free node spline function;smoothing;truncation error;parameter estimation2|917|6更新时间：2025-07-16
- 摘要：Based on the scattering from the rough conducting fractal surface with the use of extended boundary condition method,this method is extended to the case of electromagnetic scattering from the rough dielectric fractal sea surface.Compared with the numerical result of conventional Kirchhoff approximation,the accuracy of our method given is tested,the characteristic of the bistatic angular distribution of the scattering amplitude is analyzed for different incidence angles,different fractal dimensions and different spatial wave numbers.关键词：rough dielectric fractal sea surface;electromagnetic scattering;extended boundary condition method2|839|1更新时间：2025-07-16
- 摘要：The Monte Carlo method is applied to study the vegetation scattering and its low-grazing characteristic.Based on the two-layer model,taking into account of the coherent and multipath effects from different scatterers,Monte-Carlo method is applied to simulate the low-grazing scattering coefficient from the vegetation which is distributed randomly or clustered respectively.The results are appropriately used to explain the backscattering enhancement and the low-grazing scattering of the vegetation.关键词：vegetation;Monte Carlo method;low-grazing;scattering coefficient2|903|0更新时间：2025-07-16
- 摘要：Using three monopoles array as the example of linear equispaced arrays and three monopole/cross-loops array as the example of nonlinear arrays,MMUSIC algorithm is adopted to process the simulated data received from two kind of arrays on the condition of two sources on the sea.After processing,the DOA(Direction of Arrival) of linear equispaced array we get is correct,and of nonlinear array is incorrect.So the conclusion that MMUSIC algorithm is applicable for linear equispaced arrays,but inapplicable for nonlinear arrays is drawn and the reason is also analyzed.2|1069|4更新时间：2025-07-16
- 摘要：A novel multi-pass decoding algorithm is proposed to realize a CDHMM-based embedded speech recognition system.Compared with traditional Viterbi decoding algorithm,both the memory consumption and recognition time decreases significantly with little recognition accuracy's reduction at the same time.Furthermore,the confidence measure is adopted as the principle to determine the candidates in the second pass,which makes the recognition process more efficient.For the task of 200 voice commands,the accuracy rate achieves 98.83%.And then,its performance can still keep steadily while the scale of recognition vocabulary is up to 600 commands.关键词：speech recognition;embedded system;multi-pass decoding;efficient method2|1203|5更新时间：2025-07-16
- 摘要：Maneuver detection is a key issue in the multiple-model target tracking applications.In Kalman filter,the conventional maneuver detection algorithm fails to work well when the maneuver is almost buried in noise.The multiresolutional approach performs well for maneuver detection,but the time delay limits its application.In this paper,a new algorithm for maneuver detection is proposed,which is based on the third-order cumulant of the measurements.As the higher-order cumulants are blind to Gaussian noise (white or colored),the behavior of the maneuver becomes obvious and easy to be detected in the higher-order cumulant domains.Taking the sliding window processing,the maneuver detection algorithm is real-time without any time delay.Simulation results demonstrate the effectiveness of the algorithm over the conventional and multiresolutional one's,especially at low SNR.关键词：maneuver detection;higher-order cumulants;Kalman filter2|889|5更新时间：2025-07-16
- 摘要：In this paper,a semi-fragile watermarking algorithm is proposed for JPEG2000 image authentication.The algorithm is combined with the JPEG2000 image coding process.The watermark is generated and embedded based on an invariant property of DWT coefficients during the JPEG2000 compression.Once the watermarked image is tampered,the alteration regions can be located according to primary properties of the wavelet transform.The experimental results demonstrate that the watermarked image possesses good perceptual transparence,and that the proposed algorithm can detect any change to the watermarked JPEG2000 image as well as locate the tampered areas.关键词：JPEG2000;image authentication;digital watermarking2|1180|14更新时间：2025-07-16
- 摘要：A super-resolution scheme frame based on linear restoration of residual errors is proposed in this paper,which combines an existing image interpolation algorithm with an artificial neural network(ANN) modeling the residual errors between the interpolated image and the real high-resolution image. Mathematical proof is presented that the performance of our method is better than existing interpolation algorithms. Theoretically,any intra-frame interpolation algorithm can be combined into our scheme to improve its performance. Example applications and their results demonstrate the effectiveness of our approach compared with traditional methods.关键词：super-resolution;artificial neural network(ANN);linear restoration;residual error3|1253|2更新时间：2025-07-16
- 摘要：Ultrasonic images suffer from a special kind of noise called speckle.An adaptive speckle suppression and edge enhancement method based on Nakagami distribution is presented.An adaptive filter is designed by the Nakagami distribution model of speckle.The stick technique what utilizes sticks with different size and various orientations is applied to locally approximate certain linear features of image.The local region is a stick instead of a usual window,the orientation of sticks is decided by hypothesis test optimizing method and the length of sticks is concerned with local statistical feature of speckle.The effectiveness in speckle suppression and edge preservation and enhancement of the proposed filter is demonstrated on ultrasound images of prostate.关键词：speckle;ultrasonic;Nakagami distribution;stick;local variance to mean ratio;region growing2|808|0更新时间：2025-07-16
- 摘要：In this paper,singular value processing,training strategies of neural networks and competition selection are solved on the basis of singular value decomposition(SVD) applied by Z Hong et al.A new approach for face recognition on singular value features and neural networks is presented,in which singular values of face image matrix are used as features,and Back-Propagation(BP) network as recognition.Repeated experimental results on ORL(Olivetti Research Laboratory) database demonstrate that under the conditions of large samples recognition method has the characteristics of simple realization,rapid recognition speed and high recognition rate,and also profits real-time realization.关键词：face recognition;singular value features;neural networks;pattern recognition2|1900|31更新时间：2025-07-16
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