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43results about How to "Reduce sampling points" patented technology
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Indoor positioning method applied to mobile sensing network
InactiveCN102685886ASolve the problem of self-positioningHigh positioning accuracyWireless communicationMobile wireless sensor networkSensor node
The invention relates to an indoor positioning method applied to a mobile sensing network. The precision of the positioning method is improved by fully utilizing the mobility of nodes so as to overcome the shortcomings in the prior. The mobile node positioning method comprises the following steps of: 1) setting the position of an anchoring node; 2) setting the positions of the mobile nodes, and estimating the initial positions of the nodes; 3) forecasting; 4) filtering, and repeating the step 3) and the step 4) to reselect forecast points and to refilter till finding enough points meeting requirements if the number of samples in a filtered position sampling set meeting the requirements is less than N; and 5) correcting the positions, namely correcting the estimated positions of the nodes, to obtain the corrected estimated positions of the nodes. The method has the beneficial effects that the node mobility and the correlations among the nodes in the mobile sensing network are fully utilized to put forward the novel method which is used for determining the positions of the mobile nodes in the mobile wireless sensor network and mainly used for realizing the self-positioning of the nodes in the mobile sensing network in an indoor environment; and due to the method, extra hardware is not added to the sensor nodes, and the positioning precision and the positioning instantaneity of the sensor nodes can be improved.
Owner:ZHEJIANG UNIV CITY COLLEGE
A method and system for multispectral calculation and reconstruction
ActiveCN102279050AEasy to refactorHigh spectral resolutionSpectrum investigationSpectral vectorReconstruction method
The invention discloses a method for reconstructing multi-spectral information calculation based on principal component analysis. The method comprises the following steps of: 1, acquiring two paths of multi-spectral images; 2, performing principal component analysis on the spectral information of sampling points of the multi-spectral images to obtain a principal component spectral vector basis; and 3, reconstructing the spectral information on the unknown spectral points according to the principal component spectral vector basis, red, green and blue (RGB) vectors which are acquired by a camera, an R channel integral curve of the camera, a G channel integral curve of the camera and a B channel integral curve of the camera. By the method, multi-spectral information can be more simply and more quickly reconstructed; the required scene spectral sampling points are few; and principal components of the multi-spectral information can provide instructive significance for related research.
Owner:TSINGHUA UNIV
Space calibrating body and method based on virtual ball
ActiveCN103791868AImprove accuracyThe calibration result is accurateMeasurement devicesWorkloadLaser tracker
The invention discloses a space calibrating body and method based on a virtual ball. According to the space calibrating body and method based on the virtual ball, calibration is conducted in the form that a standard bar piece is separated from a base, a laser tracker is adopted to serve as measurement equipment, and a hard aluminum alloy plate is adopted by the base to serve as an installation platform of the standard bar piece. The space calibrating method based on the virtual ball comprises the steps that the space calibrating body which has three degrees of freedom is manufactured firstly, threads are machined at the two ends of the standard bar piece, one end of the standard bar piece is fixed to the hard aluminum alloy plate, the other end of the standard bar piece is used for fixing the body of the virtual ball, a regular octahedron with the top end cut off serves as the body of the virtual ball, a cone nest is machined on each face of the virtual ball, and then the virtual ball is calibrated with the laser tracker serving as the measurement equipment. The space calibrating body and method based on the virtual ball have the advantages that the precision is high, machining requirements for the standard piece are low, the number of needed sampling points is small when the space calibrating body and method are used, the calibrating efficiency is improved, and the sampling workload is greatly reduced and the calibrating efficiency is improved when an articulated type coordinate measuring machine is calibrated.
Owner:HEFEI UNIV OF TECH
Rapid generation method of trigger pulse of cascaded H-bridge multilevel converter
The invention relates to a generation method of the switching trigger pulse of a cascaded H-bridge multilevel converter, belonging to the switch modulation technical field of the power electronic converter. The invention mainly aims at the conflict between the generation precision of trigger pulse, and the number of sampling points and the computing workload, in the existing converter switch sine pulse width modulation (SPWM) trigger pulse generation technology and provides the generation method of the switching trigger pulse of the cascaded H-bridge multilevel converter, wherein the generation method is based on the carrier phase shifted-SPWM (CPS-SPWM) technology. According to the specific sampling method, sampling time sequence and algorithm of duty cycle of the invention, the SPWM trigger pulse of the converter switch can be generated rapidly. Compared with the existing CPS-SPWM pulse generation technology based on the symmetrical rule sampling method, the SPWM trigger pulse generated by the method of the invention has high precision; and compared with the CPS-SPWM pulse generation technology based on the unsymmetric rule sampling method, the number of the sampling points and the computing workload are reduced to half. In addition, by adopting the method, the time delay between the fundamental component of the output voltage of the converter and the modulated wave is small, namely the generation speed of the trigger pulse is high.
Owner:JIANGNAN UNIV
Method for positioning pseudo base station
InactiveCN104540138AEffective strikeQuick responseSecurity arrangementUltrasound attenuationCollection system
The invention provides a method for positioning a pseudo base station. The method comprises the following steps that (I) a signaling collection system acquires and filters location updating signaling of a user; (II) a location area of the pseudo base station is determined and is divided into location blocks; (III) a high-risk location block is determined; (IV) the pseudo base station is positioned by applying rayleigh distribution based on signal attenuation and a cooperative positioning technology based on an electromagnetic wave free space propagation model. According to the method, the area where the pseudo base station appears can be obtained in real time, and accurate positioning can be performed in the area; the problems that a traditional positioning method is slow in response and low in accuracy are solved, resources of law enforcement are saved, the pseudo base station can be effectively fought against, and normal network communication is protected.
Owner:四川银海天怡信息技术有限公司
Method and system for performing rapid diffusion tensor imaging under compression sensing framework
ActiveCN103356193AQuality improvementReduce sampling pointsDiagnostic recording/measuringSensorsDiffusionImaging quality
The invention provides a method and a system for performing rapid diffusion tensor imaging under a compression sensing framework. The rapid diffusion tensor imaging method comprises the following steps: A, initializing a sampling mask1 which corresponds to a first diffusion gradient, and adopting a ray type sampling locus; and B, rotating the sampling mask 1 which corresponds to the first diffusion gradient by a fixed angle to obtain a sampling mask2 which corresponds to a second diffusion gradient, rotating the sampling mask2 which corresponds to the second diffusion gradient by a fixed angle in the same direction to obtain a sampling mask3 which corresponds to a third diffusion gradient, and so on till L sampling masks are obtained in total. The method and the system have the beneficial effects that under the situation of same sampling points, diffusion images of higher quality can be obtained by remodeling. In other words, less sampling points are needed in a novel scheme while the same image quality is obtained, the sampling time is shortened, and the aim of accelerating imaging is fulfilled.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
Moving robot trajectory tracking control method based on event trigger
ActiveCN109669479ASave bandwidth resourcesSave computing resourcesProgramme-controlled manipulatorTarget-seeking controlObservational errorEvent trigger
The invention provides a moving robot trajectory tracking control method based on event trigger. The moving robot trajectory tracking control method includes the steps that (1) a motion equation of amoving robot and a dynamic equation of a reference robot are established, and a dynamic equation of tracking errors is obtained by introducing an error coordinate system; (2) control input is designedand a state measurement error of control input is given; (3) event trigger conditions are designed to stabilize an error dynamic system, and the moving robot can track the trajectory of the referencerobot; (4) the event trigger conditions in the step (3) are calculated, if the event trigger conditions are met, an event is triggered, and the controller state is updated; and otherwise, updating isnot conducted; and (5), the step (2) is returned. The moving robot trajectory tracking control method based on event trigger has the advantages that an event trigger mechanism is added to system control input, asymptotic stability of a system is ensured, thus the robot can track the given reference robot trajectory, the number of sampling in system control is reduced, resource consumption is reduced, and the utilization rate is increased.
Owner:ANHUI UNIVERSITY
Method of image dithering process for detecting photo and character automatically
InactiveUS20050162702A1Reduce sampling pointsReduce processing timeCharacter and pattern recognitionVisual presentationComputer graphics (images)CLARITY
The present invention discloses a halftone processing of image and text auto detection, which is used to keep both the bit depth of images and the clarity of text when faxing or copying documents. The process of the present invention is stated as follows: choose the background color from the master copy, separate the content of the master copy into images and text with the chosen background color as the criterion, process the images with halftone processing, process the text with link art processing, and then output the processed images and processed text as a whole.
Owner:TRANSPACIFIC OPTICS
Early fault detection system of low-speed heavy-load machine
ActiveCN103616252AReduce difficultyReduce the number of sampling pointsStructural/machines measurementBand-pass filterControl engineering
The invention relates to an early fault detection system of a low-speed heavy-load machine. According to the technical scheme, the signal output end 1a of a pressure vibration sensor (1) is connected with the signal input end 2a of an amplifier (2); the signal output end 2b of the amplifier (2) is connected with the signal input end 3a of an ultra-low-frequency phase-locked loop (3); the signal output end 3b of the ultra-low-frequency phase-locked loop (3) is connected with the analogue input end 4a of an analogue-digital converter (4); the digital output end 4b of the analogue-digital converter (4) is connected with a serial port com1 of a computer (5); a piezoelectric element (9) of the pressure vibration sensor (1), a mass block (8) and a circuit board (7) are fixed on the upper plane of a base (11); a housing (6) is fixed at the upper part of the base (11); a band-pass filter (12) is connected with a low-pass filter (14) through a high-pass filter (13); the low-pass filter (14) is connected with the amplifier (2); the band-pass filter (12) is connected with the piezoelectric element (9). The early fault detection system has the characteristics of capability of conveniently extracting weak impact signals, small number of sampling points and accuracy in fault judgment.
Owner:武汉科大电控设备有限公司
Magnetic resonance imaging method and device based on neural network
ActiveCN110333466AGuaranteed image qualityReduce sampling pointsMeasurements using NMR imaging systemsResonanceImaging quality
The invention provides a magnetic resonance imaging method and device based on a neural network. According to one instance, the method comprises the steps that according to a detection part of a detected body, the pre-trained neural network is selected, wherein a sampling track corresponding to the neural network is a matrix as large as a k-space and is used for identifying whether to sample points at corresponding positions in the k-space; a magnetic resonance imaging system is utilized to scan the detected body according to the sampling track corresponding to the neural network, and k-spacedata is obtained; and the k-space data is input into the neural network to obtain a magnetic resonance image of the detection part of the detected body. According to the method, the detected body is scanned through the sampling track corresponding to the pre-trained neural network, then image reconstruction is performed through the neural network, and therefore sampling points can be reduced as many as possible to shorten sampling time while image quality is guaranteed.
Owner:NEUSOFT MEDICAL SYST CO LTD
Method and device for obtaining timeslot power
ActiveCN101841902AReduce performance dependenciesReduce sampling pointsEnergy efficient ICTPower managementVoltageEngineering
The invention provides a method and a device for obtaining timeslot power. The method for obtaining timeslot power comprises the following steps of: sampling the coupling power voltage value of a timeslot signal to be detected in an interval in which the power change of the signal is less than a threshold, to obtain a first detection value; and obtaining the timeslot power of the signal to be detected according to the corresponding relationship between the detection value of the timeslot signal and the timeslot power and the first detection value. In the embodiment of the invention, as the signal to be detected is sampled in an interval in which the power change is less than a threshold value, and the sampling points are significantly reduced. In the invention, not only the fast changing power of signal is sampled to obtain the timeslot power, but also the dependency of the timeslot power obtaining method on the performance of an ADC device is greatly reduced without a high-speed ADC device; therefore, the invention maintains the low cost of the system and simplifies the process for obtaining timeslot power.
Owner:SHANGHAI HUAWEI TECH CO LTD
Method for tracing maximum power point in multi-crest state of solar photovoltaic strings
InactiveCN108710402ALittle impact on outputAccurate and efficient calculationPhotovoltaic monitoringPhotovoltaic energy generationMaximum power point trackingVoltage
The invention provides a method for tracing a maximum power point in a multi-crest state of solar photovoltaic strings, and belongs to the field of photovoltaic power generation. The method comprisesthe following steps: 1) derivatively calculating a current value Im1 at the position of the maximum power point by using a first wave crest five-parameter and dP / dI; 2) calculating a voltage value Um1of the maximum power point of a first wave crest by using the first wave crest five-parameter and Im1; 3) calculating the maximum power point Pm1= Im1* Um1 of the first wave crest; 4) calculating themaximum power points of all follow-up wave crests, and comparing the global maximum power point PM; 5) modulating output voltage to be UM; and circulating step 1) to step 5) periodically to trace theglobal maximum power point of the multi-crest strings. Direct calculation on the maximum power points of all the wave crests in the multi-crest state of the photovoltaic strings and global maximum power point tracing are realized, the method has the advantages of low influences of a calculating process to output of the strings and high maximum power point calculating precision, data guarantee isprovided for follow-up string working state analysis and fault diagnosis, and the engineering practicability is high.
Owner:CHINA JILIANG UNIV
Electric propulsion ship harmonic monitoring system based on FPGA and DSP
InactiveCN107505506ASlow processingProcessing speedSpectral/fourier analysisSignal conditioning circuitsHarmonic
The invention discloses an electric propulsion ship harmonic monitoring system based on FPGA and DSP. The system comprises a current sensor, a voltage sensor, a signal conditioning circuit, an A / D converter, a DSP chip and an FPGA chip. The current sensor is used for collecting a current signal. The voltage sensor is used for collecting a voltage signal. The signal conditioning circuit is used for carrying out filtering, polarity conversion and level conversion on the collected current signal and voltage signal. The A / D converter is used for converting the filtered current signal and voltage signal into a current digital signal and a voltage digital signal. The DSP chip is used for pre-processing the current digital signal and the voltage digital signal, sending the signals to the FPGA chip, carrying out post-operation on the signals processed by the FPGA chip, outputting the signals, and giving out an alarm when harmonics are abnormal. According to the invention, the harmonics of an electric propulsion system are monitored in real time; the bad influence of the harmonics on the electric propulsion system is reduced; and the navigation of a ship is stable and reliable.
Owner:WUHAN UNIV OF TECH
A Spatial Calibration Body Based on Virtual Ball and Its Calibration Method
ActiveCN103791868BImprove accuracyThe calibration result is accurateMeasurement devicesOctahedronThree degrees of freedom
The invention discloses a space calibrating body and method based on a virtual ball. According to the space calibrating body and method based on the virtual ball, calibration is conducted in the form that a standard bar piece is separated from a base, a laser tracker is adopted to serve as measurement equipment, and a hard aluminum alloy plate is adopted by the base to serve as an installation platform of the standard bar piece. The space calibrating method based on the virtual ball comprises the steps that the space calibrating body which has three degrees of freedom is manufactured firstly, threads are machined at the two ends of the standard bar piece, one end of the standard bar piece is fixed to the hard aluminum alloy plate, the other end of the standard bar piece is used for fixing the body of the virtual ball, a regular octahedron with the top end cut off serves as the body of the virtual ball, a cone nest is machined on each face of the virtual ball, and then the virtual ball is calibrated with the laser tracker serving as the measurement equipment. The space calibrating body and method based on the virtual ball have the advantages that the precision is high, machining requirements for the standard piece are low, the number of needed sampling points is small when the space calibrating body and method are used, the calibrating efficiency is improved, and the sampling workload is greatly reduced and the calibrating efficiency is improved when an articulated type coordinate measuring machine is calibrated.
Owner:HEFEI UNIV OF TECH
Topographical map high-fidelity reducing method utilizing rotating TIN (triangulated irregular network) overlay analysis
InactiveCN102760282AEasy to storeReduce coverageGeometric image transformationPartition of unityTriangulated irregular network
A topographical map high-fidelity reducing method utilizing rotating TIN (triangulated irregular network) overlay analysis overcomes the shortcoming that an existing square or rectangular network is severe in distortion when a topographical map is reduced. The topographical map high-fidelity reducing method comprises the following steps of determining the side length of a basic square; respectively arranging four sampling points at four vertexes of the basic square, and arranging 3-n sampling points on sides of the basic square and the inside of the basic square in a scattered manner to form a basic unit; counterclockwise rotating the basic unit to form a primary unit body, a secondary unit body and a tertiary unit body; splicing the basic unit, the primary unit body, the secondary unit body and the tertiary unit body to form a square assorted unit; utilizing the assorted unit as a replication unit, and performing translation replication repeatedly to form a rotating staggered assorted network covering a topographical map; respectively utilizing a unit in the assorted unit as a start unit of a rotating staggered scaling network to reduce the topographical map; and comprehensively analyzing after overlaying 4 reduced results, and selecting useful results to obtain a reduced synthesized topographical map.
Owner:黄桂芝
Cyclically symmetrical preamble signal sending system and method, and cyclically symmetrical permeable signal receiving system and method
ActiveCN107231327AAvoid timing ambiguityTiming estimates are accurateMulti-frequency code systemsMultiple carrier systemsCarrier frequency offsetPreamble
The invention provides a cyclically symmetrical preamble signal sending system and method, and a cyclically symmetrical permeable signal receiving system and method. The cyclically symmetrical permeable signal sending method comprises the following steps: generating a first time-domain basis symbol with a length of N; cyclically shifting the first time-domain basis symbol leftwards or rightwards by m sampling points, so that a second time-domain basis symbol with a length of N is obtained; carrying out repeated and alternate cascading extensions on the first time-domain basis symbol and the second time-domain basis symbol to obtain a random length, so that a preamble symbol is formed; carrying out signaling or data frame cascading behind the preamble symbol, so that a preamble baseband frame is formed; and modulating the preamble baseband frame into a radio frequency signal, and sending the radio frequency signal. The cyclically symmetrical preamble signal sending system and method and the cyclically symmetrical permeable signal receiving system and method provided by the invention have the advantages that timing estimation is more accurate, so that the timing estimation performance is greatly improved; regarding decimal carrier frequency offset estimation, the frequency offset estimation accuracy is improved; and the number of sampling points that are needed for sliding for peak detection is smaller, so that the detection time is shorter.
Owner:SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
Method and device for estimating channel
InactiveCN101888354AReduce sampling pointsReduced complexity and processing latencyMulti-frequency code systemsTransmitter/receiver shaping networksTime delaysFrequency domain
The invention discloses a method and a device for estimating a channel. The method comprises the following steps of: presetting extracting multiple of at least two stages, and dynamically determining the current extracting multiple according to link quality; according to the current extracting multiple, extracting a received frequency domain demodulation reference mark and a local frequency domain demodulation reference mark; and figuring out the current frequency domain chain estimated value by using the extracted received frequency domain demodulation reference mark and the local frequency domain demodulation reference mark. The device comprises an extracting multiple judging module, a pilot frequency extraction module and a channel estimation module, wherein the extracting multiple judging module is used for presetting the extracting multiple of the at least two stages, and dynamically determining the current extracting multiple according to the link quality; the pilot frequency extraction module is used for extracting the received frequency domain demodulation reference mark and the local frequency domain demodulation reference mark according to the current extracting multiple; and the channel estimation module is used for figuring out the current frequency domain chain estimated value through the extracted received frequency domain demodulation reference mark and the local frequency domain demodulation reference mark. The method and the device have the advantages of reducing the complexity of a receiver and reducing the processing time delay.
Owner:ZTE CORP
Grounding parameter acquisition method based on arbitrary layered soil Green function
PendingCN111723491AAccurate and efficient calculationReduce sampling pointsDesign optimisation/simulationSpecial data processing applicationsSoil scienceHydrology
The invention discloses a grounding parameter acquisition method based on an arbitrary layered soil Green function. Aiming at the two limitations of global equal-interval sampling and PRONY methods adopted by most layered soil green function calculation in current base parameter calculation, the method comprises the following steps: 1, the complex exponential term of the PRONY method is twice of the number of soil layers, and the calculated amount is linearly increased along with the number of soil layers; 2, key features of an integral kernel function cannot be effectively sampled through global equal-interval sampling; in order to solve the problem that a complex stratified soil model cannot be solved completely due to the fact that the complex stratified soil model cannot be solved completely, the invention provides an arbitrary stratified soil Green function calculation method for performing segmented sampling according to extreme points of an integral kernel function and fitting data points of segmented sampling in combination with a least square method by analyzing distribution characteristics of the integral kernel function. Compared with a PRONY method under global sampling, the method provided by the invention can better approach an integral kernel function, and has the advantages of high calculation efficiency, good precision and the like.
Owner:CHONGQING UNIV
Active battery equalization circuit utilizing relevance of flyback transformer clamped by battery and control method thereof
PendingCN110739749AIncrease capacityIncrease profitCharge equalisation circuitElectric powerLow voltageControl cell
The invention discloses an active battery equalization circuit utilizing relevance of a flyback transformer clamped by a battery. The circuit comprises a control unit, a driving unit and a rechargeable battery pack. The method comprises steps of testing a total voltage before equalizing charging of the battery, and calculating an average voltage of all battery packs; testing a voltage of each battery pack in the circuit, calculating voltage difference between the voltage of all the battery packs and the average voltage, and selecting the battery to charge according to the relationship betweenthe voltage difference and a preset threshold. The circuit and the method are advantaged in that large-current equalization can be carried out on the batteries at any time, so all single batteries inthe battery pack both can be charged to the highest voltage and discharged to the lowest voltage, the capacity and the utilization rate of the battery pack are fully improved, and simplicity and highefficiency of the system are kept. By utilizing conciseness of the single-ended flyback transformer and relevance of the winding voltage of the same transformer, the number of transformers is reduced,sampling points are reduced, and equalization and speediness are achieved.
Owner:上海多木实业有限公司
A method for locating pseudo base station
InactiveCN104540138BEffective strikeEnsure normal communicationSecurity arrangementUltrasound attenuationCollection system
Owner:四川银海天怡信息技术有限公司
Broadband electromagnetic simulation method using efficient adaptive frequency scanning
PendingCN114139372AFast and Accurate Frequency ResponseReduce sampling pointsDesign optimisation/simulationComplex mathematical operationsAlgorithmBroadbanding
The invention discloses a broadband electromagnetic simulation method using efficient adaptive frequency scanning. According to the method, frequency response convergence judgment is carried out by utilizing an error formula, so that appropriate frequency sampling points can be obtained, and compared with other methods, the required sampling points are reduced, and the simulation speed is increased. According to the method, a nonlinear problem is converted into two linear problems, accurate values of poles and residues are calculated through iteration, a linear equation is solved, an accurate frequency response fitting value is obtained, the calculation speed is increased, and the accuracy is improved.
Owner:HANGZHOU DIANZI UNIV
A system and method for sending and receiving cyclic symmetric preamble signals
ActiveCN107231327BAvoid timing ambiguityTiming estimates are accurateMulti-frequency code systemsMultiple carrier systemsTime domainCarrier frequency offset
Owner:SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
Transformer inrush current detection method and equipment and computer readable storage medium
PendingCN114076855AReduce sampling pointsThe detection process is fastElectrical testingCharacter and pattern recognitionNeural network nnInrush current
The invention discloses a transformer inrush current detection method and inrush current detection equipment and a computer readable storage medium. The inrush current detection method comprises the following steps: sampling at least one part of a current signal of the transformer to obtain a numerical matrix; providing the numerical matrix as an input to an inrush current detection neural network; and calculating and outputting a tag vector corresponding to the numerical matrix by the inrush current detection neural network, wherein the tag vector indicates whether the current signal is inrush current or not.
Owner:SCHNEIDER ELECTRIC IND SAS
In-system programming universal PFC multifunctional processor
InactiveCN102545580BReduce sampling pointsEasy to handleEfficient power electronics conversionDc-dc conversionIn-system programmingFull wave
The invention discloses an in-system programming universal PFC (Power Factor Correction) multifunctional processor. The multifunctional processor comprises full-wave rectification circuit, a DC / DC converting circuit and a PFC processor, and is characterized in that the full-wave rectification circuit converts AC commercial power into DC, the DC is output by a DC / DC converter, and the DC / DC converter is controlled by the PFC processor. The in-system programming universal PFC multifunctional processor has a simple and convenient processing procedure, and does not need frequent modification of hardware circuits; the various main-control MCU chips are adopted, the secondary development technology is easy to master, and the extensible functions are rich, so that EMI (Electromagnetic Interference) in the circuit can be effectively reduced.
Owner:深圳市益力盛电子有限公司
Method and device for correcting total ammeter readings of turnouts based on least squares method
ActiveCN109633237BAccurately reflectImprove accuracyCurrent measurements onlyCorrection algorithmData set
Owner:CASCO SIGNAL
Method and device for obtaining timeslot power
ActiveCN101841902BReduce performance dependenciesReduce sampling pointsPower managementEnergy efficient ICTVoltage
The invention provides a method and a device for obtaining timeslot power. The method for obtaining timeslot power comprises the following steps of: sampling the coupling power voltage value of a timeslot signal to be detected in an interval in which the power change of the signal is less than a threshold, to obtain a first detection value; and obtaining the timeslot power of the signal to be detected according to the corresponding relationship between the detection value of the timeslot signal and the timeslot power and the first detection value. In the embodiment of the invention, as the signal to be detected is sampled in an interval in which the power change is less than a threshold value, and the sampling points are significantly reduced. In the invention, not only the fast changing power of signal is sampled to obtain the timeslot power, but also the dependency of the timeslot power obtaining method on the performance of an ADC device is greatly reduced without a high-speed ADC device; therefore, the invention maintains the low cost of the system and simplifies the process for obtaining timeslot power.
Owner:SHANGHAI HUAWEI TECH CO LTD
Structure identification method of vulcanized joints of steel wire rope core conveyer belt of coal mine
ActiveCN106990369AImproved Smoothing EfficiencyReduce sampling pointsMagnitude/direction of magnetic fieldsEngineeringMagnetic flux leakage
The invention discloses a structure identification method of vulcanized joints of a steel wire rope core conveyer belt of a coal mine. The method comprises steps of 1, acquiring vulcanized joint magnetic flux leakage signals; 2, de-noising the vulcanized joint magnetic flux leakage signals; 3, selecting de-noising magnetic flux leakage sampling effective sequences; 4, carrying out signal smoothing processing; 5, acquiring a local extreme point of a magnetic flux leakage smooth signal z(i); 6, determining positions of a maximum value point and a minimal value point of the magnetic flux leakage smooth signal z(i); 7, removing interference abnormal local extreme points; and 8, identifying orders of the vulcanized joints of the steel wire rope core conveyer belt. According to the invention, the orders of the vulcanized joints of the steel wire rope core conveyer belt are judged through the quantity of effective maximum value points or effective minimal value points of the magnetic flux leakage signals of the vulcanized joints; the firm foundation is laid for quantitative detection of twitching of vulcanized joints of the steel wire rope core conveyer belt; the method is simple to operate, and easy to achieve and produces favorable effects; and the method has important meaning for prevention of occurrence of fracture accidents of the vulcanized joints of the steel wire rope core conveyer belt.
Owner:XIAN UNIV OF SCI & TECH
An Image Texture Feature Extraction Method Based on Nested Triangle Structure
ActiveCN107067426BReduce the number of selectionsHigh precisionImage analysisFeature extractionGrey level
The invention discloses an image texture feature extraction method based on a nested triangular structure, relating to a brand new gray different triangle matrix (GDTM). By extracting the gray difference of the nested triangle vertexes of the image at different positions and angles, counting the frequency of the gray difference, and performing normalization calculation to obtain a triangle matrix. The GDTM can reflect the distribution features of the brightness change, can reflect the comprehensive information of the image in different directions and different interval brightness changes, and is the image brightness change second-order statistic characteristic based on a triangle geometry structure. The texture characteristic quantity calculated on the basis of the invention can visually and effectively represent the image texture condition, compared with the conventional texture statistic feature extraction method such as the grey level cooccurrence matrix, the image texture feature extraction method provided is less in calculated quantity, is resistant to illumination change and RST change, can improve the description effect of large textures, and is an effective image texture feature extraction method.
Owner:EAST CHINA UNIV OF TECH +1
Method and system for reconstructing multi-spectral calculation
ActiveCN102279050BEasy to refactorRapid refactoringSpectrum investigationPrincipal component analysisSpectral vector
The invention discloses a method for reconstructing multi-spectral information calculation based on principal component analysis. The method comprises the following steps of: 1, acquiring two paths of multi-spectral images; 2, performing principal component analysis on the spectral information of sampling points of the multi-spectral images to obtain a principal component spectral vector basis; and 3, reconstructing the spectral information on the unknown spectral points according to the principal component spectral vector basis, red, green and blue (RGB) vectors which are acquired by a camera, an R channel integral curve of the camera, a G channel integral curve of the camera and a B channel integral curve of the camera. By the method, multi-spectral information can be more simply and more quickly reconstructed; the required scene spectral sampling points are few; and principal components of the multi-spectral information can provide instructive significance for related research.
Owner:TSINGHUA UNIV
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