最新刊期
卷 35 ， 期 7 ， 2007
- 摘要：Route optimization for nested mobile networks is one of the major challenges in NEMO (Network Mobility) research.Current solutions have too much additional communication cost and make the existing protocols very complicated.In this paper,we propose a new route optimization model to solve this problem.The basic idea is that a mobile router acts as an ad hoc node when it wants to select a foreign router as its point of attachment,which has multihop to it.Evaluation results show that our approach can solve the route optimization problem for nested NEMO has little additional communication cost and almost has no influence on the current protocols.Furthermore,our scheme has good adaptability to fast handoff scenario and security.关键词：nested mobile network;mobile router;route optimization;multi-hop0|2|2更新时间：2025-07-02
- 摘要：NAT is a significant barrier in SIP peer-to-peer multimedia communication.The problem of penetrating NAT in SIP application is of great research value.Considering the process of SIP protocol,we propose an SIP ALG architecture that solves the problem of penetrating NAT.Moreover,the paper studies extensively on the scheduling strategy of multi-process calling.A multi-queue priority scheduling algorithm based on calling events is proposed,as well as a model that calculates the maximum simultaneous data number in ALG.The proposed models are verified by testing results.关键词：network address translation(NAT);application level gateway (ALG);multi-queue priority scheduling algorithm0|2|0更新时间：2025-07-02
- 摘要：Combining with the theory of Markov decision process,a finite horizon model to resolve the routing problem is established in view of the features of embedded equipment interconnection environment and embedded communication middleware.The backward recursion iterative algorithm of Markov finite horizon model is modified,and Markov Finite Horizon Decision Routing (MFHDR) algorithm is then proposed.MFHDR algorithm is characteristic by distributed computing and self-studying,thus reduces work intensity of single embedded equipment,balances workload between each equipment,and has a better time and space complexity and is loop-free.关键词：interconnection of embedded equipment;embedded communication middleware;Markov decision process;finite horizon model;distributed computing0|2|0更新时间：2025-07-02
- 摘要：Remote attestation for trustworthiness of computing platform is a focus research work in Trusted Computing,but there exist some problems in some of today’s attestation approaches.System Behavior based Trustworthiness Attestation Model (BTAM) is a trustworthiness attestation model based on system behavior of attesting computing platform in trusted computing environment.BTAM determines the trustworthiness of attesting platform by its behavior sequences against the platform behavior expectation policy,therefore it avoids the difficulties in describing the state of attesting platform,assures the feasibility and scalability in the model implementation.The prototype implementation of BTAM proves the capability of BTAM in defending malicious code such as Trojan and virus and eliminating security policy conflicted activities,and the run-time performance analysis also shows the high efficiency of BTAM in security.关键词：trusted computing;system behavior;trustworthiness attestation;malicious code0|2|17更新时间：2025-07-02
- 摘要：Location is one of the fundamental services provided by smart space,and the location precision is mainly decided by the accuracy in distance measurement.However,the current wireless location technology applying into smart space brings on a series of problems.Considering the hardware characteristics of current wireless sensor nodes,the paper selects the location mechanism based on RSSI,and puts forward three methods:Least-Square Curve Fitting Method,Signal Strength Distribution Method and Hybrid Location Method.Then the paper tests performances of the three methods from location cost and location error.Seen from test results,the Hybrid Location Method which need little computing amount and has high precision is better able to meet the requirement of positioning services under the resource-constrained environment.It is proved that with appropriate iterative location algorithms,the Hybrid Location Method above can be effectively used in practical positioning applications.关键词：smart space;receive signal strength indicator;location services;Wireless sensor networks;location error0|2|33更新时间：2025-07-02
- 摘要：This paper proposes a multi-node cooperative Maximum Ratio Combining(MRC) system with minimum routes for multi-hop wireless networks.The regenerative outage performances of the mutual information for MRC cooperative system and the proposed system are analyzed over Nakagami fading channels.Their close-form expressions of the outage probability are derived using Moment Generating Function (MGF) approach.The theoretical analysis and simulation results show that MRC cooperative system can offer the full-route diversity,where the diversity order of the whole system equals to the minimal sum of the possible diversities of the full routes.And that the proposed system achieves a good tradeoff between the system performance and the processing capability of the destination node,and is very helpful to reduce the power consumption and the hardware complexity of the destination node.关键词：multihop wireless network;cooperative diversity;regenerative relaying;outage probability0|2|2更新时间：2025-07-02
- 摘要：In order to reduce effectively channel noise,parameter mismatch,and cross talks in a single channel’s communication systems with chaos,a feedback filter-bank and its algorithm based on the unscented Kalman filter are proposed for implementing multiuser communications with chaos.The results by computer simulation indicate that the algorithm has a faster convergence speed and can realize effectively multiuser communications in a single channel.关键词：chaotic communications;multiple access;feedback unscented Kalman filter;parameter modulation0|2|0更新时间：2025-07-02
- 摘要：Using buffered crossbar as a core switch fabric,we build a combined input-crosspoint-output queued switch with space-division multiplexing expansion (denoted as SDM CICOQ switch) in this paper.It is proved that an SDM CICOQ switch with an expansion factor 2 can achieve 100% throughput and exactly emulate an OQ switch.Thus,SDM CICOQ switches can provide QoS guarantees for traffic flows.For the simplicity of implementation,we also present a hierarchical priority scheduling (HPS) scheme as a reference designing for the scheduling policy of the SDM CICOQ switch.Simulation results show that the SDM CICOQ switch operating under the HPS scheduling scheme can obtain good performance.关键词：switch architecture;quality of service(QoS);buffered crossbar;scheduling;priority0|2|3更新时间：2025-07-02
- 摘要：A novel system based on cooperative distributed space-time block code and multi-carrier code division multiple access (DSTBC-MC-CDMA) is proposed which works well on multiple single-antenna users wireless networks in frequency selective fading channel.And an analytical model to describe the symbol decoding error between interusers is established,based on the model,a theoretical bit error rate (BER) performance expression of the system has been derived.Then simulation is complimented to versify the analytic result above,and the simulation also shows that the BER performance of DSTBC-MC-CDMA outgoes non-cooperative MC-CDMA with distinctive gains.Furthermore,the simulation results verify the validity of theoretical results.关键词：cooperative diversity;theoretical bit error rate;distributed space-time block coding;multi-carrier code division multiple access;frequency selective fading channel0|2|0更新时间：2025-07-02
- 摘要：A two-phase query rewriting based approximate XML (extensible markup language) query algorithm is proposed.The algorithm can not only return the exact answers,but also return the sequence of approximated answers with similarity degree.Firstly,through the strategy of scheme rewriting,an original query tree is rewritten into query trees with different XML DTDs (document type definition) so as to solve the problem of semantic loss due to the heterogeneous XML data.Secondly,the transformed query trees derived by the sequences of the basic transformation operations are used to perform exact embeddings into XML data tree,so as to transform the problem of approximate XML query into the problem of exact XML query for transformed query trees.Thirdly,XML data distribution statistics based similarity degree computing model and optimization algorithm for Top-K problem are given.Finally,the experiments of intelligent design of automobile shape show our algorithm outperforms the SSO algorithm.关键词：approximate XML query;basic transformation operation;transformed query tree;schema rewriting;heterogeneous XML documents0|2|4更新时间：2025-07-02
- 摘要：The effective application of multiple-input multiple-output (MIMO) technology lies in efficient space-time interference cancellation strategy.This paper proposes a joint decision feedback interference cancellation (DFIC) and particle filtering (PF) soft equalization scheme for frequency selective MIMO channels.Firstly we set up the relation between the signal’s strongest paths and receive antennas index through pilot,and also determine the DFIC order based on signal-to-interference-plus-noise ratio.Next,in terms of a posterior estimation criterion,with the information of path strength as well as receive signal structure,we construct the importance distribution of received signal,and adopt the PF to obtain the optimal decision of interested signal,with which the interference cancellation is implemented.Simulation results show that equalization error propagation is hold back effectively and the computational complexity is reduced significantly.关键词：multiple-input-multiple-output;pilot;particle filtering;soft equalization;decision feedback interference cancellation0|2|0更新时间：2025-07-02
- 摘要：The classic 2-dimension image scrambling is used in the equilateral image,but for the non equilateral image,it has to be expanded into equilateral image or scrambled by the high-dimension scrambling transformation matrix.To solve the problem,in this paper,a novel 2-dimension non equilateral image scrambling transformation is proposed and the periodicity existence judgment criteria are presented.Furthermore,the proper scrambling matrix coefficients are selected by the judgment criteria so that the expanded 2-dimension scrambling transformation can be used to scramble non equilateral image without extra space and cost and the recoverable periodicity exists.The experiments show the validity and feasibility of proposed scrambling transformation.关键词：image scrambling transformation;non equilateral image;Arnold transformation;image encryption0|2|12更新时间：2025-07-02
- 摘要：In terms of the characteristics of images and combining the directional information with multiresolution analysis,an idea based on directional filter banks (DFB) is presented in this paper.Considering the visual features of eyes,using the contrast pyramid (CP) analysis to capture the low frequency information of images,and directional filter banks (DFB) to obtain the high frequency information of images further,an image fusion scheme based on multiscale contrast pyramid and directional filter banks (CPDFB) is given in this article.Furthermore,analyzing the mechanism and camputational complexity,fusion results can be achieved better and save the runtime greatly at the same time.The validity and efficiency are shown by experiments.关键词：image fusion;directional filter banks(DFB);contrast pyramid(CP) decomposition;visual features0|2|5更新时间：2025-07-02
- 摘要：A Gradient Field Bi-Directional Generalized Dynamic Image Model (GFBD-GDIM) method for optical flow estimation is proposed,in which the optical equation is established at gradient field of images to weaken optical estimation errors caused by illumination variations,using two sub-vectors to estimate the wanted motion vector can reduce the model error of motion equation,GDIM is applied to generalize the method.Finally,two groups of experiments show that the presented method is more accurate and robust.关键词：optical flow;brightness constancy model(BCM);gradient field;generalized dynamic image model(GDIM);bi-directional estimation0|2|3更新时间：2025-07-02
- 摘要：Aimed at the difficult segmentation of medical ultrasound image with poor contrast and strong speckle noise,a novel method for segmentation of ultrasound images is proposed.The method statistically analyzes number distribution of connected features,which are extracted from ultrasound image by morphological transformation in different scale,to estimates the scale (or size) of noise particles.At the same time,the intensity values of the scale-specific features are amplified or attenuated to achieve local contrast enhancing and noise suppressing.Then,an alternative fuzzy C-mean algorithm is used to segment ultrasound image enhanced.The algorithm can help further to reduce noise effect to segmentation and achieve satisfying results.The experimental results demonstrate effectiveness of the method for ultrasound image segmentation.关键词：image segmentation;morphological operation;fuzzy clustering;fuzzy C-mean clustering0|2|3更新时间：2025-07-02
- 摘要：Objective quality assessment has been widely used in image processing for decades and many researchers have been studying the objective quality assessment method based on Human Visual System (HVS).Recently,the Structure Similarity (SSIM) is proposed by Zhou Wang,under the assumption that the HVS is highly adapted for extracting structural information from a scene ,and simulation results have proved that it is better than PSNR(or MSE),furthermore SSIM is very simple.By our studying deeply,it is found that it has some deficiencies in its arithmetic method,and fails in measuring blurred images.Based on this,we develop two improved methods which are called as Gradient-based Structural Similarity(GSSIM) and Edge-based Structural Similarity(ESSIM).Experiment results show that GSSIM is more consistent with HVS,while ESSIM gets the best performance for blurred image.关键词：image quality assessment;structural similarity(SSIM);gradient-based structural similarity(GSSIM);edge-based structural similarity(ESSIM);human visual system(HVS)0|2|41更新时间：2025-07-02
- 摘要：Watermark synchronization is very crucial to design robust image watermarking scheme.In this paper,a new robust image watermarking scheme against desynchronization attacks is proposed.Firstly,the Harris-Laplace detector is utilized to extract feature points,which can survive a variety of attacks.Then,the local characteristic regions are adaptively constructed according to the characteristic scale theory.Finally,several copies of the digital watermark are embedded into the nonoverlapped local characteristic regions by quantizing the DFT mid-frequency magnitudes.By binding the watermark and image features,the resynchronization between the embedding and detection can be accomplished.Experimental results show that the proposed scheme is not only invisible but also robust against common signals processing and desynchronization attacks.关键词：image watermarking;desynchronization attack;feature point;local characteristic region0|2|7更新时间：2025-07-02
- 摘要：Bionic Pattern Recognition is a new model of pattern recognition principle.It’s based on "matter cognition" instead of "matter classification" and the basic idea of this model is that the sample points in the feature space are continuous.We proposed a new time series matching algorithm in this paper according to the basic idea of bionic pattern recognition.It makes use of the continuity rule between the samples that belong to the same class to sort the time series and to add new samples between the neighbor time series,so that the number of samples increases.We test the algorithm by classifying pressure series of pressure keyboard with simple nearest neighbor and achieve a better experimental result than traditional dynamic time warping (DTW).关键词：time series matching;bionic pattern recognition;dynamic time warping0|2|3更新时间：2025-07-02
- 摘要：This paper addresses new methods to recreate signals with periodic and rectangular features,employing Jump Dictionary-based overcomplete sparse representation method,and signals with periodic and impulse features,employing self-adaptive segmentation-based overcomplete sparse representation method.As revealed in our trials,in terms of approximation error and sparsity,both of the two methods mentioned above get better prediction results than basis pursuit algorithm and wavelet approximation.关键词：signal representation;overcomplete;sparse representation;jump dictionary;adaptive segmentation;periodic signal;rectangular signal;impulse signal0|2|2更新时间：2025-07-02
- 摘要：By introducing the concepts of generating states set and generating probability a simple and direct proof of the fundamental theorem of probability logic is proposed.Next,by introducing the concept of naturally merged probability the fundamental theorem has been generalized.Moreover,the present paper extends the concept of δ -consistency degree of finite logic theories to be the concept of -consistency degree and therefore certain relationship between probability logic and quantitative logic has been obtained.关键词：uncertainty;generating states set;generating probability;naturally merged probability;quantitative logic;-consistency degree0|2|26更新时间：2025-07-02
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A Novel Cooperative Wake-up Routing Algorithm for Wake-up Mechanism in Heterogeneous Sensor Networks
摘要：Based on directional diffusion algorithm,this paper proposes a novel cooperative wake-up routing algorithm (CWR algorithm) for wake-up mechanism in heterogeneous sensor networks.We substitute a high-cost node with the nearest low-cost node,which launches multi-hop diffusion.In particular,we add two steps:routing displacement and routing repair to establish network topology between low-cost nodes and their corresponding high-cost nodes,thus provide a necessary network topology foundation for wake-up mechanism.Simulation results demonstrate that our CWR algorithm is energy-efficient during wake-up process.关键词：heterogeneous sensor networks;cooperative wake-up routing;directional diffusion;CWR algorithm0|2|3更新时间：2025-07-02 - 摘要：We proposed a histogram weighted filtering algorithm with soft-threshold for images heavily corrupted by salt-pepper impulse noise.It was based on the correlativity principle of image pixel gray.The neighboring correlativity coefficient was defined to identify noisy pixels and adaptively adjust the filtering intensity.Theoretical and experimental results show that the proposed algorithm has great performances for filtering out impulse noise in extremely corrupted images by high density salt-pepper noise.关键词：histogram;weighted filtering;soft-threshold;salt-pepper noise0|2|11更新时间：2025-07-02
- 摘要：Ad hoc network is a provisional autonomous system of multi-hop mobile nodes.This kind of wireless network does not has infrastructure,so the method of composing ad hoc network is very flexible and convenient.In this paper,on the basis of analysis characteristic of Ad Hoc network,we have introduced a K fold multicast network.This K fold multicast network can run multiplicate of different multicast operations in one network topology.Although K-fold multicast network can be regarded as the combination of K entries of common multicast network,the system payload and energy cost of K-fold multicast network’s hardware design can be greatly reduced.This advantage is very available for Ad Hoc network.We researched different change instances of the node connection degree in this network situation in detail and designed a load balance algorithm.The simulation result indicated this algorithm can control the congestion well and increase the network stability.The simulation results also show that this algorithm is very suitable for this new kind of network which has high packet delivery ratio and routing establishment ratio.K-fold Ad hoc multicast network is a new kind of multicast network,it will be greatly applied in the military and medical conditions.关键词：Ad Hoc networks;K fold multicast networks;load balance;routing algorithm;node link degree0|2|1更新时间：2025-07-02
- 摘要：According to OFDM systems being very sensitive to carrier frequency offset,a low-complex and non-pilot-aided fractional frequency offset synchronization method is proposed.By employing the properties of OFDM symbol and cyclic prefix,the remaining fractional frequency offset is synchronized after MLE algorithm.The method gets the data phase difference of each sub-carrier in frequency domain.Through re-using the phase generating block of complex number in MLE Algorithm,hardware resources are saved.Simulations show that the frequency offset caused by sampling is well corrected,and the method is easy to achieve as well as effective.关键词：orthogonal frequency division multiplexing (OFDM);frequency offset;synchronization;non-pilot-aided method0|2|5更新时间：2025-07-02
- 摘要：A services-oriented Optical Burst Switched (OBS) ring network with wavelengths tenability is presented in this paper.It employs the Acoustic-Optic Tunable Filter (AOTF) to realize the Fixed Transmitter and Tunable Receiver (FTTR) scheme.In addition,the effect of the max burst length and the transmission distance on the performance of the OBS ring network with Round-Robin Token protocol (RR/TOKEN) is investigated by computer simulations.From the simulation results,two conclusions can be drawn.One is that the maximum burst length has a great influence on the network throughput and the average edge-to-edge delay of the packets.With the increase of the maximum burst length,the network throughput will go higher and the average edge-to-edge delay of the packets will go lower.The other is that the increase of the transmission distance of the OBS ring network will make the performance of the network much worse than usual.关键词：services oriented;acoustic-optic tunable filter (AOTF);optical burst switching (OBS);scheme of fixed transmitter and tunable receiver(FTTR)0|2|0更新时间：2025-07-02
- 摘要：Multimodal biometric fusion and identification technique can improve the performance of identification system.Combined with 2-Dimensional Fisher Linear Discriminant Analysis (2DFLD),a model for face and iris feature fusion and recognition is presented in this paper.Firstly,compression is done to face and iris image respectively,and the two corresponding original feature matrixes are obtained.Secondly,the two original feature matrixes from face and iris image are integrated into one matrix,and a combined feature matrix is formed.Then feature extraction to the combined feature matrix is done by 2DFLD,and a fused feature matrix is constructed.Finally,Nearest Neighbor Decision (NND) rule is used in recognition.Experimental results on ORL (Olivetti Research Laboratory) face database and CASIA (Chinese Academy of Sciences,Institute of Automation) iris database show not only small sample effects can be solved,but also a high correct recognition rate can be gained,and demonstrate that the valid model is supplied for multimodal biometric identification.关键词：2-dimensional fisher linear discriminant analysis;feature fusion;multimodal biometric recognition;face recognition;iris recognition0|2|8更新时间：2025-07-02
- 摘要：Denoising algorithm based on gradient dependent energy functional,modify images towards piecewise constant functions.Important information,encoded in image features like textures or certain details,is often compromised in the process of denoising.A noise-texture detect operator is proposed in this paper.The filtered information,during the process of denoising,will be checked again by using this operator,then textures and details filtered by mistake will be extracted as much as possible.After refilling these textures and details into the denoised image,the final denoised image is obtained.Experiment results show that our new method has obvious effect in preserving textures and details.关键词：energy functional;image denoising;texture information0|2|2更新时间：2025-07-02
- 摘要：New concepts of the all phase Walsh biorthogonal transform and the dual biorthogonal base vectors were proposed.Based on this transform,a new image compression algorithm was introduced.Compared with DCT in JPEG image compression algorithm,the PSNRs of the reconstructed images using the all phase Walsh biorthogonal transform are the same as DCT’s at the same bit rate,but the advantage is that the quantization is very simple.The transform coefficients can be quantized uniformly,therefore the computing time becomes less and the hardware realization is easier.关键词：all phase Walsh transform;biorthogonal transform;dual biorthogonal base vectors;JPEG image compression algorithm;discrete cosine transform(DCT);peak signal to noise ratio(PSNR)0|2|2更新时间：2025-07-02
- 摘要：In the recent years,the appearance of C-arm CT brought much versatilities to the CT scanning trajectories,such as circle-circle trajectory,line-circle trajectory and so on,and they would play an special role for a specific region of imaging or radiotherapy.Recently,a novel BPF reconstruction algorithm has been developed,which can handle both the longitudinal truncations and the transversal truncations in projection data,and therefore enable the feasibility of exact local reconstruction.In order to obtain much better local reconstructions,in this work,we proposed a general line-circle trajectory,and furthermore,based on the BPF algorithm,we developed a universal reconstruction algorithm for this kind of trajectory,which can be accommodated to different combinations of the circle and the line in the trajectory.This algorithm can achieve a ROI as small as possible,which will be verified and validated in the experiments in this work.关键词：cone-beam CT(computed tomography);exact 3D reconstruction;C-arm;line-circle trajectory0|2|1更新时间：2025-07-02
- 摘要：The frame theory is one of the fundamental tools in study the sampling questions,epically for non-uniform sampling questions,in signal processing community.Weyl-Heisenberg frames are foundation of Gabor transform,Short time Fourier transform,and proved to be important tools in time-frequency signal processing,it gives a signals local properties by using these frames to present a signal.Extensions of these frames are obtained in the linear canonical transform domains from the frames in the time-frequency domain,properties of frames in linear canonical transform domains are also derived.关键词：linear canonical transform;Weyl-Heisenberg frames;time-frequency analysis0|2|1更新时间：2025-07-02
- 摘要：In order to provide larger capacity of the hidden secret data and to maintain a good visual quality of stego-image,in accordance with the visual property that human eyes are insensitive to edged area and dark area,a novel steganographic method based on wavelet contrast and Least-Significant-Bit(LSB)replacement is presented.First,an image is divided into blocks,and every block is decomposed into one-level wavelet to obtain the wavelet contrast.Then,the number of bit-plane embedded is decided with the sum of abstract of wavelet contrast.Finally,secret information is embedded by LSB.From the experimental results,the proposed method can hide much larger information and maintain a good visual quality of stego-image.Besides,the embedded data can be extracted from the stego-image without referencing the original image.关键词：steganographic method;wavelet transform;wavelet contrast0|2|18更新时间：2025-07-02
- 摘要：A fast image super-resolution reconstruction algorithm is proposed based on multigrid(MG)and conjugate gradient(CG)algorithms.Firstly,the image super-resolution reconstruction model is put forward using Tikhonov regularization.After systemically introduction of MG and CG algorithms,an accelerative MG algorithm named MG-CG is proposed to solve the sparse symmetric positive linear equation,which is often occurred in image super-resolution reconstruction.The smooth,restriction and interpolation operators are thoroughly studied and the computational complexity is analyzed in detail.Experimental results demonstrate that the proposed algorithm can greatly improve the speed of convergence compared with MG,CG,and Richardson iteration.关键词：image processing;super-resolution reconstruction;multigrid algorithm;conjugate gradient algorithm;multigrid-conjugate gradient algorithm1|3|2更新时间：2025-07-02
- 摘要：One-dimensional(1-D)and two-dimensional(2-D)Otsu’s methods are two common thresholding segmentation methods.2-D Otsu’s method is superior to 1-D Otsu’s method for images with noise.A basic assumption for 2-D Otsu’s method is that "the probability sum of the object and background regions is close to 1",this assumption could not be effective in some cases,thus Jing et al.introduced three-dimensional (3-D) Otsu’s method and gave a recursive algorithm.3-D Otsu’s method behaves well for images with low SNR and low contrast.In this paper,the mistakes in Jing’s recursive formulas are pointed out and a corrected version is given.Because the existed recursive algorithm can not be considered as a real recursive algorithm,we propose a new recursive algorithm.Experimental results show that the computing time of our method is less than that of Jing’s method,in addition we point out that 3-D Otsu’s method can obtain better segmentation results for images with mixture noises.关键词：image segmentation;threshold selection;3-D Otsu’s method1|2|44更新时间：2025-07-02
- 摘要：An affine transform invariant local watermarking is designed and test against attacks performed by Stirmark using the Krawtchouk moment invariants.Watermark is inserted into the perceptually significant Krawtchouk moment invariants.Watermarking based on Krawtchouk moment invariants are local,that is,the embedded watermark affects only a selected portion of the original image,the position of which can be decided by user.This means that the watermark is especially robust to cropping.Independent Component Analysis(ICA) is adopted by detector to extract the perfect watermark blindly.The computational aspects of proposed watermarking are also detailed.Experimental results have demonstrated that the proposed watermarking technique has a good robustness against watermark benchmark Stirmark.关键词：Krawtchouk moment invariants;local affine transform invariant watermarking;independent component analysis;Stirmark0|2|8更新时间：2025-07-02
- 摘要：As the second image restoration,super-resolution image restoration has become an active research issue in the field of image restoration.In general,super-resolution image restoration is an ill-posed problem.Prior knowledge about the image can be combined to make the problem well-posed,which contributes to some regularization methods.In these regularization methods,however,regularization parameter was selected by experience in some cases.Other techniques to compute the parameter had too heavy computation cost.In this paper,owing to the introduction of sub-pixel registration error,the statistic model of the error was discussed.And a simple and available method to solve regularization parameter was proposed in term of Miller’s regularization.The method to solve regularization parameter can adaptively and locally regulate the distortion introduced by registration error.Simulations demonstrated that the regularization parameter solved by the method could make super-resolution image restoration convergence more efficiently.关键词：Super-resolution image restoration;sub-pixel registration error;regularization parameter0|2|3更新时间：2025-07-02
- 摘要：In order to eliminate the noise included in EMG and hold details of the signal,spatial correlation filtering for EMG de-noising is put forwarded based on wavelet transformation.Firstly,the paper briefly summarizes the basic theory of wavelet transformation and spatial correlation filtering.Secondly,the paper analyze the process of EMG de-noising with spatial correlation filtering in detail.With wavelet analysis,the signal and noise is separated by spatial correlation filtering.At the same time,the arithmetic of estimating noise-energy threshold of EMG is proposed.The experimental results show that the fringe characters of EMG are reserved effectively through spatial correlation filtering,which offer good conditions for withdrawing the characters of EMG.关键词：electromyography(EMG);wavelet transformation;spatial correlation filtering;correlation coefficient0|2|17更新时间：2025-07-02
- 摘要：Traditional genetic algorithm (GA) easily gets stuck at a local optimum,and often has slow convergent speed.As a novel genetic algorithm,cloud-model-based genetic algorithm (CGA) was originally proposed.CGA is based on both the idea of GA and the properties of randomness and stable tendency of a normal cloud model.In this algorithm,a Y-conditional normal cloud generator is used as the cross operator of GA,and a basic normal cloud generator is used as the mutation operator.Finally,the experiments of function optimization and IIR digital filter design were conducted to compare CGA with standard GA,NQGA,CAGA and LARES.From the simulation results,it is believed that CGA is effective and will become a promising candidate of evolutionary algorithms.关键词：genetic algorithm;cloud model;cloud genetic algorithm;function optimization;IIR digital filter design0|2|53更新时间：2025-07-02
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