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136 results about "One-dimensional space" patented technology
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In physics and mathematics, a sequence of n numbers can specify a location in n-dimensional space. When n = 1, the set of all such locations is called a one-dimensional space. An example of a one-dimensional space is the number line, where the position of each point on it can be described by a single number.
Method for detecting network attack behaviors
InactiveCN101753381AReduce complexityAvoid complexityData switching networksComputation complexityInternet traffic
The invention discloses a method for detecting network attack behaviors, which comprises the following steps: (1) reconstructing a network traffic time sequence to be detected to a multi-dimensional phase space according to the complicated non-linear property of network traffic, and establishing a statistic distribution module according to a normal network traffic time sequence; (2) carrying out smoothing treatment on the network traffic time sequence to be detected, and dividing into sub-windows; and (3) obtaining a parameter sequence according to parameters of all the sub-windows of the network traffic time sequence after the smoothing treatment according to the calculation of the statistic distribution module, and establishing a comprehensive decision module according to the parameter sequence for detecting abnormality. The network traffic is re-constructed to the multi-dimensional space, thereby fully displaying information hidden in a one-dimensional space, reducing the computational complexity of each dimensional space and improving the running speed; and the method can improve the robustness and the accuracy of a system and is characterized by low computational complexity, high detection rate and low false detection rate.
Owner:HUAZHONG UNIV OF SCI & TECH
System and method for line scan confocal ophthalmoscope
InactiveCN102008288AEasy to adjustFulfill control requirementsOthalmoscopesImaging qualityLight beam
The invention relates to a system and method for a line scan confocal ophthalmoscope. The system comprises a linear light beam generation module, a splitting module, a scanning module, an imaging module and an output module. A linear light beam is subject to one-dimensional space scanning by the line scan confocal ophthalmoscope to illuminate fundus oculi retina, simultaneously a linear detector is used for image non-scan light beams reflected from the fundus oculi retina, the system only uses one scanning galvanometer and one linear detector, and the number of active members is small; and simultaneously, a confocal slit is conjugated with the plane of the fundus oculi retina, thereby eliminating the influence of eliminate stray light of a non-retina plane on imaging quality and obtaining high resolution by using the confocal imaging principle. The invention has the advantages of simple structure, short light path, good stability and high imaging frame frequency, is easy for manufacture and suitable for adjustment, and is small and exquisite.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Multi-template object tracking method based on CNN and CF
ActiveCN106887011AMeet actual needsFree movementImage analysisFeature extractionComputation complexity
The invention discloses a multi-template object tracking method based on CNN and CF. The present invention proposes a method of using a plurality of fixed scale values for normalizing the template before solving the convolution operation, and then reversing the most appropriate scale after obtaining the maximum response value; although the existing DSST algorithm is used to decompose the three-dimensional optimal scale search into the best position in two-dimensional space and the optimal scale mechanism is searched in one-dimensional space, the iteration is slow and the computational complexity is high; in view of the characteristics that the movement of the unmanned aerial vehicle platform is random, the speed is uncertain and so on, the method of the fixed scale value is used to not only meet the tracking algorithm needs, but also to meet the real-time operation; in the characteristic extraction stage, the two characteristics are extracted respectively, two different groups of filters are trained, according to the appearance and the background change of the current object, different weights are set for performing appearance representation of the object; and results obtained from the different characteristics are fused to obtain the tracking result.
Owner:西安艾晟信息技术有限公司
Nondestructive inspection method and device for internal defect of workpieces by x-ray diffraction x scan
InactiveCN101358938AImprove spatial resolutionMaterial analysis by transmitting radiationX-raySingle crystal
The present invention relates to a nondestructive testing method of X-ray diffraction which is used for detecting the internal defect of a workpiece which is made of crystal material (including single-crystal materials and polycrystalline materials) or material which contains atoms arranged in sequence along the one-dimensional space, and a device thereof, in particular suitable for detecting the internal defect of the workpiece made of material which consists of atoms of low atomic number. The method adopts the nondestructive test to get the intensity distribution map of diffraction of materials in all internal parts of the tested workpiece; then the nondestructive test is adopted to analyze the internal defect, the defect type and distribution of the tested workpiece. The X-ray tube radiation of easily available heavy metal anode target, which can be industrialized and practically applied, can be used in the rapid nondestructive test of the internal defect and the defect type of aluminum and magnesium workpieces which have a thickness of a plurality of millimeters; and the spatial resolution is superior to the existing X-ray detection machine and X-ray CT.
Owner:SOUTHWEST TECH & ENG INST
Maneuvering target tracking method under constraint conditions
ActiveCN106054170AImprove tracking performanceRadio wave reradiation/reflectionEquation of stateComputer science
The invention discloses a maneuvering target tracking method under constraint conditions, comprising the steps of: A, obtaining the position measurement information of a maneuvering target; B, converting the position measurement information into Cartesian coordinate measurement; C, establishing a constrained coordinate static model in a one-dimensional space, i.e., building the mileage S expression of the position of the maneuvering target in road x, y directions; D, setting motion models according to motion characteristics of the maneuvering target, and establishing a state equation and a measurement equation according to the established expression; and E, for each motion model, filtering converted Cartesian coordinate measurement to obtain a one-dimensional variable mileage S and speed filtering result. According to the embodiment, the tracking performance of a maneuvering target can be improved.
Owner:HARBIN INST OF TECH
Line-scanning confocal ophthalmoscope system based on laser diffraction and method
InactiveCN102068236AEven energy distributionGood quality beamOthalmoscopesImaging qualityBeam splitting
The invention relates to a line-scanning confocal ophthalmoscope system based on laser diffraction and a method. The system comprises a linear beam generation module, a beam-splitting module, a scanning module, an imaging module and an output module. The invention is characterized in that: the intensity of the linear beam generated by the line-scanning confocal ophthalmoscope system is uniformly distributed in a non-Gaussian form, a scanning galvanometer is adopted to scan the linear beam in a one-dimensional space to illuminate an ocular fundus retina, meanwhile, a linear detector is used for imaging the non-scanning linear beam reflected by the ocular fundus retina, and since the system only uses one scanning galvanometer and one linear detector, the number of the moving parts is less; meanwhile, a confocal slit is conjugated with the ocular fundus retina plane, consequently, the affection of the stay light of the non-retina plane on the imaging quality is eliminated, and thereby the high resolution of the confocal imaging principle. The system has the advantages of good linear beam quality, simple system structure, easy manufacturing, short light path, easy adjustment, small size, applicability, high stability and high imaging frame frequency.
Owner:INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
Method and system for processing a non-linear two dimensional spatial transformation
An image transformation method for translating a non-linear 2D geometrical transformation into two separable 1D geometrical transformations first determines the inverse of the 2D geometrical transformation to form an inverse 2D geometrical transformation. Then the method converts the inverse 2D geometrical transformation into an analytical inverted 2D geometrical transformation and separates the analytical inverse 2D geometrical transformation into first and second 1D geometrical transformations. The method then represents said inverse 2D geometrical transformation and first and second 1D geometrical transformations as tensor spline surfaces and then compares an evaluation of said first and second 1D geometrical transformations at each pixel with an evaluation of the analytical inverse 2D geometrical transformation at each pixel. If the error evaluation does not meet a predetermined level of performance then the separation and transformation steps are repeated. Since the method involves one-dimensional spatial transform processing it results in reduced calculations, efficient memory access, and ability to process data in a real-time environment. In-addition, since the method provides a compact representation of the spatial transforms, it can be scaled for a particular level of precision.
Owner:GEO SEMICONDUCTOR INC
Compression spatial spectrum-based single base MIMO (Multiple Input Multiple Output) radar target DOA (Direction of Arrival) estimation method
ActiveCN104251989AAvoid federated searchReduce operational complexityDirection findersSpecial data processing applicationsRadar systemsMultiple signal classification
The invention relates to the technical field of radars, in particular to the application of a single base MIMO (Multiple Input Multiple Output) radar system and a compression spatial spectrum-based single base MIMO radar target DOA (Direction of Arrival) estimation method. The compression spatial spectrum-based single base MIMO radar target DOA estimation method comprises the steps of enabling an emission array to emit phase-coded signals which are mutually orthorhombic and enabling a receiving terminal to perform matched filtering processing through a receiving array matching filter; performing dimensionality reduction processing on J receiving data subjected to snapshotting matched filtering through a dimensionality reduction array; calculating a covariance matrix R of the receiving data Y subjected to dimensionality reduction processing and working out an intersection subspace of a noise subspace and a conjugate subspace thereof; constructing a compression spatial spectrum function and searching the compression spatial spectrum function; excluding a false DOA and obtaining a real DOA of a target. The compression spatial spectrum-based single base MIMO radar target direction of arrival estimation method avoids a combined search of a two-dimension DOA of a traditional MUSIC algorithm when searches the airspace DOA, and only needs one-dimensional space search and the algorithm complexity is reduced.
Owner:HARBIN ENG UNIV
Magnetic nano temperature imaging method and magnetic nano temperature imaging system
ActiveCN103892809ASolving for temperature has no effectAccurately obtainedThermometers using electric/magnetic elementsUsing electrical meansHarmonicMagnetite Nanoparticles
Owner:HUAZHONG UNIV OF SCI & TECH
Well test interpretation method of vertical well for thickened oil thermal recovery
InactiveCN103161435ASolve problems that are difficult to solve exactlyCalculation structure is simpleSurveyFluid removalBottom hole pressureTime domain
The invention provides a well test interpretation method of a vertical well for thickened oil thermal recovery. The method comprises: choosing a time varying well test model according to a thickened oil vertical well thermal recovery mode before a well test process; obtaining a real space solution of a bottom pseudopressure function with well storage according to the time varying well test model; and converting the real space solution of the bottom pseudopressure function with the well storage into a real space bottom hole pressure solution through converting the bottom pseudopressure function with the well storage from a temporal domain into a time domain. The temporal domain is a multi-dimensional space, and arguments of the temporal domain are time, pressure and temperature. The time domain is a one-dimensional space, and an argument of the time domain is time. The well test interpretation method is simple in computation structure, the problem that a thermal recovery well test mathematical model is different to solve accurately is solved, and accurate inversion of oil deposit dynamic parameters through the thermal recovery well test is achieved.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Device and method of space heterodyning interference hyper spectrum imaging
InactiveCN103033265ARealize imaging detectionSimple methodInterferometric spectrometryFace detectionGrating
The invention provides a device and a method of space heterodyning interference hyper spectrum imaging. The device comprises a pre-positioned objective lens, a slit, a collimator objective, a grating type Michelson interference system, a post-positioned imaging system and a signal processing system, wherein the pre-positioned objective lens, the slit, the collimator objective, the grating type Michelson interference system, the post-positioned imaging system and the signal processing system are arranged in sequence along the light path direction. Target incident light passes through the pre-positioned objective lens and forms an image at the slit. Emergent light passes through the collimator objective and enters the grating type Michelson interference system and is divided into two interferential plane waves to form interference fringes. Light passes through an imaging objective lens and a cylindrical mirror in sequence, an image carrying one-dimensional space information and interference information is obtained on a detector target surface, and light intensity information of a two-dimensional scene and interference information of each row by scanning a target. The signal processing system extracts interference data under different optical path differences, and Fourier transformation is carried out to obtain target spectrum information and two-dimensional image information of each spectrum section. By means of the device and the method of the space heterodyning interference hyper spectrum imaging, spectral resolution of an existing interference spectrum imaging device can be improved, and sub-nanometer-level face detection with hyper spectral resolution can be carried out.
Owner:NANJING UNIV OF SCI & TECH
Online detection method based on laser radar
ActiveCN108549087AAchieving real-time limit violation detectionGuaranteed detection accuracyElectromagnetic wave reradiationPoint cloudRadar
The invention discloses an online detection method based on a laser radar, and the method comprises the following steps: S1, point cloud acquisition: establishing a global coordinate system, a vehiclebody coordinate system and a measurement coordinate system at an initial position of an intelligent inspection robot, and converting detection point coordinates, measured by a lidar, into position coordinates in the global coordinate system; S2, point cloud preprocessing: calculating an orbital plane by point cloud data of all the detection points located in the global coordinate system; S3, early warning judgment: projecting a real-time measured scanning point of the lidar to the orbital plane extracted at step S2, and calculating the projection distance from the scanning point to the orbital plane, determining that a foreign object invades the boundary if the projection distance is less than a set threshold value, or determining that the foreign object does not invade the boundary if the projection distance is greater than the set threshold value. The method provided by the invention enables a problem of a three-dimensional space into a one-dimensional space for judgment, reduces the calculation burden under the condition that the detection precision is guaranteed, and achieves the real-time boundary invasion detection in a tunnel of rail traffic.
Owner:BEIJING RUITU TECH LTD
Image quality enhancement and filtering method applied to CMOS image sensor
ActiveCN106504281AEasy to implementImprove technical performanceImage enhancementImage analysisImaging qualityNoise reduction
The invention relates to an image quality enhancement and filtering method applied to a CMOS image sensor. According to the method, interpolation processing on original Bayer data outputted by the image sensor is carried out, and a pixel value of a three primary color RGB space is acquired; the pixel value of the three primary color RGB space is transformed to be YUV space; a contrast ratio of a Y channel is adjusted; saturation of U and V channels is adjusted; secondly, hybrid noise reduction processing is carried out; lastly, edge sharpening processing on the Y channel is carried out, and the image later processing data is outputted; the three primary colors RGB refer to red, green and blue three primary colors, the YUV space refers to chrominance space, the Y refers to brightness, and the U and the V refer to aberration. Through the method, a pipelining grade design idea is employed, the image data is not stored, only one-dimensional space image enhancement and noise reduction processing on the Bayer data after interpolation are carried out, technology processing performance is relatively good, complexity is low, the method facilitates hardware realization, and occupied chip sources are a few.
Owner:THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP
Mould cavity numerical control machining spiral curve track planning method
InactiveCN101452284AControl residual heightImprove processing efficiencyProgramme controlComputer controlNumerical controlVelocity function
The invention relates to a method for programming a spiral curve track through die cavity numerical control machining .The boundary of a die cavity is embedded into a level set function of a high one-dimensional space; a zero level set of the level set function is the boundary of the die cavity; and the level set function is initialized to a sign distance function. Bias of the boundary of the die cavity is obtained through the solution of a level set equation; and a speed function of the level set equation is corrected so that a high-curvature region can be smooth in generating a bias line. The distance between the bias lines is controlled through the control of time for boosting the boundary; in the process of boosting the boundary of the die cavity, the complex topological change is naturally treated; and the spiral curve track is programmed in different regions respectively. The method is suitable for programming a cutter track of a numerical control machining system with a common die cavity and a complex die cavity; the cutter track is continuous and smooth; and for the complex die cavity with island, the method can realize automatic division in regions and carry out spiral curve track programming in different regions.
Owner:SHANGHAI JIAO TONG UNIV
Matching Apparatus, Image Search System, and Histogram Approximate Restoring Unit, and Matching Method, Image Search Method, and Histogram Approximate Restoring Method
InactiveUS20080205756A1Easy to calculateQuick matchCharacter and pattern recognitionRestoration methodMatching methods
To provide a matching technology for determining the similarity between two objects at high velocity with high precision.A matching method for comparing a set of feature points of two objects projected to an N-dimensional space and determining the similarity between the two objects, includes a mapping step (S3) of mapping the set to a one-dimensional space, a pairing step (S6) of creating a set of pairs of a feature point of first object that is the most approximate to a feature point of second object, a partial-set creating step (S7) of partly extracting the pairs in small order of the pair distance from the set of the pairs of the feature points and creating a partial set of the pairs of the feature points, an average-value calculating step (S8) of calculating a rating-scale of the pair belonging to the partial set of the pair of the feature points, and a determining step (S10) of determining the similarity between the first object and the second object on the basis of an average value of the distance.
Owner:KITAKYUSHU FOUND FOR THE ADVANCEMENT OF IND +1
Ultrashort laser pulse shape measurement device
The invention discloses an ultrashort laser pulse shape measurement device. In the device, a detected vertically-polarized parallel laser beam passes through a light splitter and is divided into transmitted light and reflected light, reflected fundamental frequency light is subjected to beam expanding and then is divided by a biprism into upper fundamental frequency light and lower fundamental frequency light which are parallel to each other and which enter a frequency doubling crystal at symmetric angles, then horizontally-polarized frequency-doubled light is generated, time intensity information is converted into intensity autocorrelation one-dimensional space information, the frequency-doubled light and the transmitted light after the light splitter achieve frequency conversion on a frequency conversion crystal, then third-order correlation signal light is generated, the time intensity information is converted into intensity third-order correlation two-dimensional space information, and finally, pulse shape information is obtained though the simple reconstruction technology. The ultrashort laser pulse shape measurement device is low in cost, compact and simple in structure and convenient to adjust, and can measure picosecond and femtosecond pulse shapes.
Owner:LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
Quantum lattice diffracting rasters
A diffraction grating of quantum dot array is prepared by arranging large amount of quantum dots in quasi-random way on grating base, placing dots on one dimensional space of surface is random distribution and on another dimensional space in sine distribution for obtaining quantum dot array grating. The senior diffraction of the grating is so low as to be ignored.
Owner:LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
Matching apparatus, image search system, and histogram approximate restoring unit, and matching method, image search method, and histogram approximate restoring method
InactiveUS20080193029A1Easy to calculateQuick matchCharacter and pattern recognitionRestoration methodMatching methods
To provide a matching technology for determining the similarity between two objects at high velocity with high precision.A matching method for comparing a set of feature points of two objects projected to an N-dimensional space and determining the similarity between the two objects, includes a mapping step (S3) of mapping the set to a one-dimensional space, a pairing step (S6) of creating a set of pairs of a feature point of first object that is the most approximate to a feature point of second object, a partial-set creating step (S7) of partly extracting the pairs in small order of the pair distance from the set of the pairs of the feature points and creating a partial set of the pairs of the feature points, an average-value calculating step (S8) of calculating a rating-scale of the pair belonging to the partial set of the pair of the feature points, and a determining step (S10) of determining the similarity between the first object and the second object on the basis of an average value of the distance.
Owner:KITAKYUSHU FOUND FOR THE ADVANCEMENT OF IND +1
Three-dimensional reconstruction method scanning tomographic images through in-tube stepping one-way beams
ActiveCN106981090APromote reductionImprove spatial resolutionImage enhancementImage analysisThree-dimensional spaceReconstruction method
The invention discloses a three-dimensional reconstruction method scanning tomographic images through in-tube stepping one-way beams. For the tomographic images scanned through the in-tube stepping single-mode fiber beams, a linear stepping speed is set in a stepping motor, the one-dimensional space relative linear position of a pixel point is determined, on the condition that a stepping motor rotation speed is determined, for a two-dimensional image pixel point of each image, pole coordinate transformation is carried out to determine the position of the pixel point on a two-dimensional plane, according to the plane position information, the static position of a three-dimensional space opposite to the pixel point is determined. As beam reflection intensities are different in gray values on each tomographic image, a distance between two adjacent images is calculated, a gray difference calculation mode is employed to carry out interpolation, and three-dimensional image characteristics can be more visually represented. The method is advantaged in that in-tube image information extraction can be carried out, reconstructed tube inner wall images have high precision, and the great auxiliary effect on medical interventional operation cardiovascular inner wall complex shape diagnosis and organization characteristic determination is realized.
Owner:NANJING UNIV OF POSTS & TELECOMM
Composite flat sample three-dimensional space charge measurement device based on pulsed electro-acoustic method
ActiveCN108089068AAvoid interferenceSample bondingElectrical measurementsMeasurement devicePiezoelectric sensor
The invention discloses a composite flat sample three-dimensional space charge measurement device based on a pulsed electro-acoustic method. The composite flat sample three-dimensional space charge measurement device comprises an upper electrode and a lower electrode, wherein an aluminum electrode is arranged in the upper electrode, a dual-layer composite flat plate dielectric sample is arranged between the aluminum electrode and the lower electrode, a pin electrode and a pin electrode are arranged between layers of the dual-layer composite flat plate dielectric sample, an absorption layer used for absorbing acoustic waves is arranged in the lower electrode, a piezoelectric sensor is arranged on the absorption layer, the piezoelectric sensor is connected with an amplifier, and the amplifier is connected with a computer by means of an A / D converter. The composite flat sample three-dimensional space charge measurement device successfully reproduces the accumulation, dissipation and migration characteristics of the space charges in a composite flat plate sample in an orthogonal nonuniform electric field, more realistically simulates the electric field environment of the sample under real working conditions, fully utilizes a greater number of piezoelectric films and makes all the piezoelectric films be closely attached to the lower surface of the lower electrode, breaks through thecurrent limitation that only one-dimensional space charge distribution in a uniform electric field can be measured, and improves the reliability of space charge measurement results.
Owner:XI AN JIAOTONG UNIV
Safety detection method and apparatus of account number
ActiveCN105208009AImprove security detection efficiencyImprove accuracyTransmissionData miningOne-dimensional space
The embodiment of the invention provides a safety detection method and apparatus of an account number. The method comprises: service data of a target account number in at least one dimensional space are obtained and an evaluation coefficient corresponding to the at least one dimensional space is obtained; a comprehensive score of the target account number is calculated by using a preset account number evaluation rule according to the service data of the target account number in at least one dimensional space as well as the evaluation coefficient corresponding to the at least one dimensional space; and safety of the target account number is determined according to the comprehensive score of the target account number. According to the invention, the service data in at least one dimensional space are used as the basis of account number safety detection, thereby realizing automatic detection of the safety of the account number, improving the efficiency of the account number safety detection, and guaranteeing comprehensiveness and accuracy of an account number safety detection result.
Owner:TENCENT TECH (SHENZHEN) CO LTD
Novel voltage type multi-level inverter
ActiveCN102969924AImprove output power qualityReasonable useDc-ac conversion without reversalCapacitanceMulti input
The invention discloses a novel voltage type multi-level inverter. When the number of input power sources is expanded from n to n+1, the number of power switch tubes is increased from 2n+2 to 2n+4, wherein n is an integer not smaller than 1, similarly hereinafter; and when voltage of the input power sources is the same, the number of output levels changes from 2n+1 to 2n+3, namely when one power source is added, two power switch tubes and two levels are added. Compared with an existing classic multi-level inverter, the novel voltage type multi-level inverter enables the used power switch tubes and isolation driving to be less, a clamping diode and a flying capacitor and the like are not required, part of the power switch tubes are be in a low-frequency working state, on-off times is little, and switching loss is reduced. According to the novel voltage type multi-level inverter, one-dimensional space vector modulation is adopted, a modulation method is simple, the computing speed is quick, redundant vectors are reasonably utilized, quality of electric energy output by the inverter is improved, and the novel inverter meets the technical requirements of renewable energy and new energy power generation and is suitable for multi-input power source occasions.
Owner:华夏天信智能物联股份有限公司
Window query method in P2P environment
InactiveCN101667200APrevent floodingConvenient and quick query abilityClimate change adaptationTransmissionNetwork structureData mining
The invention discloses a window query method in P2P environment. The window query method can be constructed on the network structure by utilizing the advantages possessed by centralized network and completely unstructured network simultaneously by the super node P2P network; on each individual network node, data are mapped to a one-dimensional space by the dimension-reduction algorithm iMinMax, and the values after mapping can be stored and queried by B+ tree and other traditional DBMS index structures; then a data statistic information sheet is built and a network query tree is constructed on each super node; and when the node P transmits a query request, firstly, the query request is transmitted to the super node to which P belongs, then the super node finishes querying internally according to the data statistic information sheet, and transmits the query to other super nodes according to the network query tree to finish the query of the whole network ultimately, and finally the query results are returned to P. The method can effectively avoid network flooding and can query the returned data efficiently.
Owner:ZHEJIANG UNIV
Single scaling second-order monoemitting autocorrelation measurer
InactiveCN1358987AImplement width measurementUnderstand communicationInstrumentsBeam splitterCorrelation function
The laser pulse to be tested is passed through beam splitter and separated into two beams, one beam is passed through first total reflector and second total reflector, and fed into double frequency crystal, another beam is passed through an echelon reflection face angle reflector and third total reflector and fed into double frequency crystal. The laser pulse outputted on the detection element connected with computer. Said invention can implement one-dimensional space resolved simple second-order related measurement, and utilize one pulse signal and one measurement to can simultaneously scale and collest dwo-D plane information.
Owner:SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
Pose identification method of arc sensing welding gun
ActiveCN105328303AAvoid Aliasing InterferenceTake full advantage of orthogonalityArc welding apparatusThree-dimensional spaceEngineering
The invention provides a welding gun pose identification method based on arc vector space characteristic analysis. A rotating arc sensor is used for decomposing sampled time signals to arc left-right and front-back position signals by a rotating arc scanning unit circle; the arc left-right and front-back position signals and arc sensing signals form three component vectors of three-dimensional space arc vectors; arc sensing signals in a one-dimensional space are converted to the three-dimensional space arc vectors; arc vector spaces with different characteristic bases as substrates are built according to arc moving rules and groove types; then, representation rules of welding gun poses in different vector spaces to the arc vectors are analyzed; and arc vector characteristic values reflecting the welding gun poses are extracted. The method can effectively identify the information of such multiple welding gun poses as left-right and front-back positions and deflection angles of the welding gun relative to welding lines by the extracted arc vector characteristic values, can be applied to such multiple places as welding line groove identification, welding line automatic tracking and welding gun pose adjustment, and is higher in practical value.
Owner:XIANGTAN UNIV
Data accompanying analysis method and device
InactiveCN107229940AReduce complexityImprove timelinessCharacter and pattern recognitionIndication/recording movementDimensionality reductionMathematical model
Owner:ALIBABA GRP HLDG LTD
Radar arrival direction estimation method and device, computer device, and storage medium
InactiveCN110007283AEliminate the effects ofHigh precisionWave based measurement systemsMulti inputEstimation methods
The invention belongs to the field of radar signal processing, and provides a radar arrival direction estimation method and device, a computer device, and a storage medium.The radar arrival directionestimation method comprises the following steps that a matrix X composed of echo signals of K received targets is subjected to a dimension reduction process toobtain a dimension reduction data matrixY; a sparse signal model is constructed based on the dimension reduction data matrix Y; an objective function used for estimating the echo power of the K targets is obtained according to the sparse signal model; the echo signal power in the objective function non-uniform noise covariance matrix are initialized and updated; grid points in need of location update in the sparse signal model are updated through polynomial rooting; when the number of iterationsof an algorithm reaches a preset upper limit or when the algorithm converges, the updated spatial discrete gridis subjected to a one-dimensional space spectrum searching to obtaina multi-input and multi-output radar arrival direction estimated value. The radar discrete grid arrival direction estimation method and device, the computer device, and the storage medium has the advantages of being robust both to non-uniform noise and the discrete grid,performance isstill good in a rough grid, and accuracy is high.
Owner:HAINAN UNIVERSITY
A mass space object storing method fusing codes and multi-version data
ActiveCN106991149AImprove range query performanceMeet data query needsGeographical information databasesTransmissionSpace objectData query
The invention provides a mass space object storing method fusing codes and multi-version data. Multi-dimension space data are converted to one-dimensional space via low-precision grid coding and high-precision space object coding and then redundant data trimming involved in a query process is achieved via a strategy of lexicographical order location of data blocks and low-redundancy data query, so that the range query performance is effectively improved. When the coding precision is 8 Base-32 characters, the covering area of a grid unit is about 725m<2>; when a query radius is 1000m, query response time is not longer than 1s. The method can effectively meet data query requirements such as tour resource recommendation based on positions of tourists in smart tourism.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Abinocular stereoscopic vision matching method for generalizing belief propagation
The invention relates to an abinocular stereoscopic vision matching method for generalizing belief propagation. The method comprises the following steps of: (1) acquiring a left image and a right image of two eyes to establish Markov random fields; (2) generating multiple scales of Markov random fields, wherein the kth layer is one fourth the size of the (k+1)th layer; (3) solving the Markov random fields in an order from 1 to n, decomposing the problem of searching a minimum value in a two-dimensional space into the problem of searching a minimum value in a plurality of one-dimensional spaces, reducing a state space by using a state space reduction strategy of the scale spaces and transferring a calculation result of the ith layer to the (i+1)th layer after iteration is finished; and (4) using the state with the minimum iteration value as the final state of a variable, i.e. a parallax value of points in an image, corresponding to the variable, after the Markov random field at the lowest layer is solved. The invention effectively lowers the complexity and reduces the amount of calculation.
Owner:ZHEJIANG UNIV OF TECH
Laser pulse shape measurer based on third-order correlation method
The invention discloses a laser pulse shape measurer based on a third-order correlation method. Measured parallel laser beams are converted into transmission light and reflection light through a light splitter, the transmission light is converted into transmission light and reflection light through a semitransparent mirror, the transmission light and the reflection light are converted into frequency doubled light through a frequency doubling crystal, the time strength information is converted into the strength autocorrelation one-dimensional space information, the frequency doubled light beam and a reflection light beam after passing through the light splitter are converted through the frequency doubling crystal to realize frequency-tripled conversion, and the time strength information is converted into the strength third-order correlation two-dimensional space information. According to the measurer, through the simple reconstruction technology, not only can the pulse width information be acquired, but also the pulse waveform information can be accurately acquired, and picosecond and femtosecond pulse waveforms can be processed. The measurer has advantages of low cost, simple structure and convenient adjustment.
Owner:LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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