132 results about "Stable point" patented technology

The invention belongs to the technical field of information retrieval, and particularly relates to a music retrieval system based on audio fingerprint features. The system is composed of a preprocessing module, a feature extraction module, a reverse index module and a fine matching module. The preprocessing module mainly carries out audio signal conversion, resampling and filtering; the feature extraction module is used for representing audio files, wherein the audio fingerprint features are adopted to select the most stable point from a frequency spectrum as the feature point through twice screening based on dynamic threshold values, and each feature is represented by a dot pair; according to the reverse index module, the features are used as key words, reverse indexes are built according to the features of a song library, and the index result is returned according to the number of the same key words; according to the fine matching module, the sequential relationship of the audio features is combined, an improved editing distance is adopted as the similarity of two feature sequences, and therefore the index result is optimized. The music retrieval system based on the audio fingerprint features is suitable for the retrieval of a large number of songs, and can particularly conduct effective retrieval on record inquiry segments.

The invention discloses a user stable point discovering method and system based on mobile behaviors. The method comprises the following steps of 1) generating structurized user position switch data information; 2) sorting the user position switch data information according to the time sequence, and extracting a space movement behavior trail sequence of each user as a trail sequence; 3) combining the space movement behavior trail sequences to obtain new space movement behavior trail sequences; and 4) if the percentage of the stay time of a user at a normal position point represented by a community code occupying the total stay time and reaches a preset interval value, the position point is a stable point of the user. According to the user stable point discovering method and system based on mobile behaviors, provided by the invention, as the time and space disciplines of the user movement behavior rail data are highlighted, the stable point distribution of the user in different periods is discovered by utilizing a period division way, thereby improving the identification precision and application range.

The invention discloses an image matching algorithm of bonding point characteristic and line characteristic descriptors. The method comprises the following steps: (1) carrying out angle point extraction on a template drawing and a real-time drawing under multiscale; (2) acquiring an edge set surrounding angle points of the real-time drawing and the template drawing; (3) calculating a class ORB point characteristic descriptor of real-time drawing and template drawing angle points which are acquired from the step 1 and are selected finally; (4) using a minimum cut square Hausdorff distance to describe a matching similarity of the real-time drawing and template drawing edge set acquired from the step 2; (5) calculating a matching similarity of the class ORB point characteristic descriptor of the real-time drawing and template drawing angle points, wherein the characteristic descriptor is acquired from the step 3; (6) matching result integration. In the method of the invention, firstly, a stable point characteristic is used to carry out primary selection on the angle points so as to acquire a candidate point set and a correct position is included; then a global line characteristic is used to screen the candidate point set so that a repetition mode can be reduced and a correct rate is increased.

Method and apparatus for the manipulation and/or control of the position of particles by means of time-variable fields of force. The fields of force can be of dielectrophoresis (positive or negative), electrophoresis, electrohydrodynamic or electrowetting on dielectric, characterized by a set of stable points of equilibrium for the particles.

Rather than unmounting a corrupt filesystem while doing recovery, the filesystem remains mounted but I/Os to the corrupt area are blocked while a repair process is called to repair the corruption. Threads attempting to access the filesystem go into a waiting state until the corruption is fixed, then are restarted at a stable point in their execution.

An illuminated electric part includes a manipulating shaft which is rotatable and is stable at least at two points. The manipulating shaft is light-transmissive and includes a pictograph portion which is illuminated at a top portion thereof. The illuminated electric part includes a light emitting element which is arranged at a side of the manipulating shaft. The manipulating shaft includes side faces which constitute light incident faces in directions orthogonal to an optical path from the light emitting element at respective stable points and, at the same time, includes a conical light reflecting face having a downwardly extending top at a side opposite to the incident faces.

An object of the present invention is to provide a golf club classification method capable of classifying a golf swing precisely. Specifically, the present invention provides a classification method comprising steps of: partitioning the golf swing of the golfer into golf swing trajectories of a back swing, a down swing, and a follow through so as to determine a stable point in the golf swing trajectories as an origin for any two of the trajectories and to assign a two dimensional coordinate to the two golf swing trajectories; determining straight lines connecting each of one point selected within each of the two golf swing trajectories and the origin; calculating angles between each of the determined straight lines and the horizontal line respectively for the two golf swing trajectories; and classifying the golf swing based on a difference between the calculated angles.

The invention provides a multi-time-phase SAR image registration method combining a stable point and a characteristic point. The method comprises the following steps of carrying out correlation consistency (CS) area detection, and according to SAR image complex data, calculating Coherent Scatters of an image and carrying out SAR-FAST angle point extraction; calculating an intersection of a CS area position and a characteristic point position to acquire a stable characteristic point, and using a SIFT descriptor to describe; in a characteristic coarse matching phase, using a KD index tree to match a descriptor and then rejecting a mismatching point based on a RANSAC algorithm; and during accurate registration, using Powell to search optimal mutual information position so as to carry out accurate registration. In the invention, through using a mode of combining the stable point and the characteristic point, SAR image registration is performed so that high registration precision is acquired.

The optical transmission apparatus for multiple wavelengths according to the present invention comprises; a light source, a temperature control section for controlling the temperature of the light source, a temperature control (ATC) loop for controlling the operation of the temperature control section, and a wavelength control (AFC) loop. The ATC loop detects the temperature of the light source and feedback controls the operation of the temperature control section, so that the optical output wavelengths of the light source fall within a wavelength capture range corresponding to a target wavelength of the AFC loop. The AFC loop has a wavelength detection filter having a periodic transmission wavelength characteristic. After the operation of the ATC loop has stabilized, a wavelength capture operation is commenced, and the operation of the temperature control section is controlled so that the optical output wavelength of the light source is captured at a stable point corresponding to a target wavelength, among a plurality of stable points.

The invention researches the problem of controlling a voltage PWM rectifier when a power supply is unbalanced according to a principle that the change of a physical quantity depends on energy changes. On the basis of the passivity of a novel synchronous rotation transformation and a rectifier, a new passive energy control law is determined. The novel synchronous rotation transformation can transform an unbalanced system of the PWM rectifier supplied by an unbalanced power supply into a quasiequilibrium system. The passive energy control law determined by a novel damping injection method can decouple a system, transform a non-linear system into a linear system, and simultaneously converge the rectifier to an expected stable point quickly. A passivity-based control system for the voltage type PWM rectifier supplied by the unbalanced power supply (referring to an attached figure) established based on the novel synchronous rotation transformation and the new passive energy control law has excellent movable and still performances, and achieves unit power factors, current on-line side sine, and direct current voltage constant control.

The invention provides an analysis method for subsynchronous oscillation generated by grid connection of wind driven generators. The analysis method comprises following steps: establishing a linearized system model formed in such a manner that wind driven generators are connected to an infinite-bus power system via series compensation capacitance; calculating static stable points of the linearized system model; obtaining characteristic roots of a coefficient matrix of the linearized system model and left and right feature vectors thereof; obtaining all oscillation frequencies of the linearized system model according to characteristic roots and obtaining state variables related to the oscillation modes of the all the oscillation frequencies in the linearized system model; and varying parameter values of the state variables in order to acquire states in which all the oscillation frequencies vary with the corresponding state variables.The analysis method for subsynchronous oscillation generated by grid connection of wind driven generators has following beneficial effects: a quantitative analysis on subsynchronous oscillation generated by grid connection of wind driven generators can be made so that subsynchronous oscillation generated by grid connection of wind driven generators can be effectively monitored and addressed.

The invention discloses a method for designing stability parameters of a self-adapting filter of a self-balancing system of a magnetic suspension rotor. The method comprises the following steps of establishing a radial rotation dynamics differential equation model of the self-balancing system of the magnetic suspension rotor with a gyroscopic effect; converting a real coefficient bivariate gyroscopic coupling system into a complex coefficient univariate equivalent system through complex transformation; calculating a closed-loop transfer function of the complex coefficient univariate equivalent system; determining a start angle range of a root locus, which meets the stability requirement of the self-balancing system, at a critical stable point of an imaginary axis; resolving a stability parameter intersection of the self-adapting filter; finally, determining the stability parameters of the self-adapting filter. While the rotor speed is estimated and tracked in real time so as to improve the self-balancing precision, the stability of the self-balancing system of the magnetic suspension rotor with the gyroscopic effect within a full speed range is ensured. The method disclosed by the invention is simpler and more convenient than other methods, and is especially suitable for practical magnetic suspension rotor systems.

The invention relates to the field of electronic engineering, and provides a method for metering vehicle oil charge. The metering method comprises the step of extracting real-time dynamic information of vehicles with the engine ignition on-off state being 0, the step of comparing the remaining oil mass of every two adjacent sampling points in sequence to determine suspected filling-up areas, the step of determining the first remaining oil mass stable point and the second remaining oil mass stable point before the suspected filling-up areas through the moving average filter method, and the step of finishing the vehicle oil charge metering according to the remaining oil mass data of the first remaining oil mass stable point and the remaining oil mass data of the second remaining oil mass stable point. By means of the method for metering the vehicle oil charge, the vehicle oil charge can be accurately metered, and the oil consumption statistics of the vehicles can be carried out conveniently.

An object state identification method of identifying a position and a posture of an object by obtaining actual measured values, which are three-dimensional data, at points on a flat portion including an opening on a surface of the object by a sensor includes extracting a corresponding point value indicating the position of an edge of the opening based on a predetermined feature value, calculating a plane equation indicating a plane including the flat portion based on the corresponding point value to determine a virtual plane, extracting, as a stable point, an actual measured value that is in the virtual plane, and identifying the position, posture, etc., of the object based on the stable point.

The invention relates to a power cable emergency load current carrying capacity detection method and system. The method comprises the following steps that: the alternating current resistance, ambienttemperature, conductor temperature and the temperature of each branch layer of the insulation layer of a power cable under a condition that a circuit malfunctions are detected; thermal resistance andthermal capacity between the external surface of the cable outer jacket of the power cable and a soil temperature stabilization point are determined according to the historical operating data of the power cable; the emergency load current carrying capacity calculation model of emergency load time is obtained by using the law of conservation of energy of thermodynamics according to the alternatingcurrent resistance, the ambient temperature, the conductor temperature, the temperature of each branch layer of the insulation layer, the thermal resistance and the thermal capacity; and the maximum current carrying capacity of the power cable with the temperature of the power cable not exceeding set temperature after the emergency load time is calculated. With the method and system of the invention adopted, the maximum current carrying capacity of the power cable under a condition of the emergency load can be detected, and a large amount of experimental resources can be saved. The detection method and system can be more conveniently applied to practical projects.

A biometric processing system. The inventive system implements a novel algorithm for extracting a unique and repeatable code from a biometric image that includes acquiring a biometric image; detecting prominent features in the image; extracting a working area from the image for each detected prominent feature, wherein each working area is a portion of the image around the prominent feature; computing a plurality of parameters for each working area; and encoding the parameters to form an output code. In an illustrative embodiment for fingerprint identification, the prominent features are singularities, and the system defines a local reference system for each working area that is based on the location and orientation of the singularities. Topologically stable points such as minutiae are detected for each working area, and several parameters are then computed for each minutia relative to the local reference system.

The present invention provides an edge-based local stereo matching method. After an initial disparity map is obtained; grid point sampling is performed on the disparity map; unsteady grid points are deleted, and stable grid points are preserved; Canny edge points are extracted from the image; stable edge points and the stable grid points are merged into a stable point set; and interpolation is performed on the other points according to disparity corresponding to the stable points, so that an accurate dense disparity map is obtained. According to the method provided by the invention, gradient is adopted as matching cost; a fixed window cost aggregation mode is adopted to calculate the matching cost; and the initial disparity map is obtained through left and right consistency detection. The method of the invention has the advantages of low complexity, high speed and high precision, and is suitable for occasions having high requirements for real-time performance.

An electromagnetic actuator is provided that can achieve reduction in size, weight and cost by a simple configuration, and a solenoid-valve device provided therewith. The electromagnetic actuator section includes fixed pole pieces that a middle of three fixed magnetic poles has, and coils wound around the fixed pole pieces. The coils are wound in the same winding direction. The needle has first and second stabilization points corresponding to the fixed magnetic poles on both sides in the axial direction, and a third stabilization point corresponding to the middle fixed magnetic pole, as stabilization points at which a stationary state can be maintained when the coil is unenergized.

The invention provides an InSAR-based monitoring method for airport deformation in reclamation areas. The InSAR-based monitoring method for airport deformation in the reclamation areas comprises the steps that candidate point targets distributed discretely are extracted; the phase standard deviation of each candidate point target is calculated to obtain a stable point target; three-dimensional space-time unwrapping is carried out on a phase of the stable point target to obtain an unwrapped phase; a least square method is used, and a deformation phase containing spatial interference componentsis obtained; an atmospheric phase and an orbit error phase are separated out according to the deformation phase containing the spatial interference components to obtain the deformation phase; and theweight of the deformation phase and the time series deformation of the stable point target are calculated, so that the monitoring of the airport deformation in the reclamation areas is completed by using the time series InSAR technology. According to the InSAR-based monitoring method for airport deformation in the reclamation areas, an amplitude deviation threshold value and a time coherence coefficient method are combined, so that the number and density of the candidate point targets in the reclamation airport areas are improved, and the deformation rate accuracy is improved; and the InSAR-based airport deformation monitoring method of the reclamation areas can further be used for high-precision inversion of deformation fields in complex field areas in low coherence areas.

At present, a hanging screen system is used by matching with a projector, light is projected on a screen of the hanging screen system by the projector, and images are displayed on the screen. An existing hanging screen system adopts a top hanging point manner, and a hanging screen is vertical. The projector is used in a family cinema step by step, some users like to lie when watching movies or a television, but an angle of the screen for watching the movies while lying is inappropriate. The invention discloses a projection hanging screen system which comprises top hanging points, bottom hanging points and the screen. A plurality of stabilizing points are arranged on the top hanging points, when the top hanging points are placed in different stabilizing points, vertical inclined angles of the screen can be different. The hanging points can be fixedly stopped in the stabilizing points, and each stabilizing point can be independent or existed in a continuous mode. When the top hanging points are stopped in different stabilizing points, the bottom hanging points change so that parallel translation is generated, and the vertical inclined angles of the screen can be different.

A system for detecting the water content in crude oil of an oil field united station comprises a settling tank, a stepping pressure sensor and a processing system, wherein the processing system comprises a density determination unit used for determining the density of each altitude based on the pressure information of each altitude, a layering determination unit used for determining the altitude of a low-water-content crude oil layer based on the density of each altitude, a low-water-content crude oil layer stable point determination unit used for determining stable points in the low-water-content crude oil layer at continuous altitudes, a crude oil real-time concentration determination unit used for determining the real-time concentration of crude oil based on the pressure and altitude data of the stable points, a preset stable point water content and water density, and a crude oil water content determination unit used for determining the water content of crude oil at each altitude in the settling tank based on the real-time concentration of crude oil, the water density of an oil field and the pressure information of each altitude in the settling tank.