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308results about How to "Real-time correction" patented technology
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Method and apparatus for measuring optical aberrations of the human eye
InactiveUS6439720B1Quickly and accurately measuringMaximize accuracyRefractometersSkiascopesLight spotImage detection
An apparatus for measuring optical aberrations of the human eye wherein the person positions his or her eye on an optical axis of the apparatus and looks at an illuminated target on the optical axis that is visible to the eye for allowing the eye to focus on the target and establish a position of the eye. A collimating lens on the optical axis is movable along the optical axis for adjusting the apparent optical distance between the eye and the target. A light source directs a predetermined light beam along the optical axis into the eye and onto the retina of the eye as a spot of light. A lens reimages the light scattered from the light spot on the eye retina into a wavefront curvature sensor that forms two oppositely defocused images on an image detector, and a computer processes and analyzes the two defocused images for measuring the optical aberrations of the eye.
Owner:AOPTIX TECH
Force sensor system for use in monitoring weight bearing
InactiveUS20060282017A1Quality improvementNormalize gait patternElectrotherapySolesEngineeringBiological activation
A force sensor system for use in monitoring weight bearing on a location. The force sensor system comprises at least one a foot force sensor, a palm force sensor, and a knee force sensor. The foot force sensor comprises a flexible insole containing a plurality of inflatable pockets that are inflated with air or liquid. The palm force sensor and knee force sensor each comprise a wrap to be worn around the palm and knee, respectively. Each wrap comprises a pocket. Each pocket is connected to a tube that, in turn, connects with a pressure sensor and a connector coupling that is remote from the pocket. Each coupling contains a valve. The valve opens to allow inflation and deflation of each inflatable pocket. The pressure sensors measure the air or liquid pressure within each of the inflatable pockets, and convert the corresponding pressure signal into a suitable output signal medium, usually electrical signals. The output signal from the sensors provides accurate real time input data to a weight bearing biofeedback system or to control a stimulator for activation of an electronic orthosis to normalize dynamic gait patterns.
Owner:ANDANTE MEDICAL DEVICES
Method and apparatus for measuring optical aberrations of the human eye
InactiveUS20020047992A1Measure quickly and accuratelyQuickly and accurately measuringRefractometersSkiascopesLight spotImage detection
An apparatus for measuring optical aberrations of the human eye wherein the person positions his or her eye on an optical axis of the apparatus and looks at an illuminated target on the optical axis that is visible to the eye for allowing the eye to focus on the target and establish a position of the eye. A collimating lens on the optical axis is movable along the optical axis for adjusting the apparent optical distance between the eye and the target. A light source directs a predetermined light beam along the optical axis into the eye and onto the retina of the eye as a spot of light. A lens reimages the light scattered from the light spot on the eye retina into a wavefront curvature sensor that forms two oppositely defocused images on an image detector, and a computer processes and analyzes the two defocused images for measuring the optical aberrations of the eye.
Owner:AOPTIX TECH
Method for assembly digital field based on flexible array pressure sensor and method for training gait
ActiveCN101590315AMeet real-time requirementsReal-time adjustmentSki bindingsCosmonautic condition simulationsTraining planSimulation
The invention relates to an assembly digital field based on a flexible array pressure sensor and a method for training gait. Parameters of an athlete including action time sequence, action frequency, position calibration, stress center point, stress time and flight time can be acquired through acquiring information including pressure of foot soles of the athlete contacted with the flexible array pressure sensor unit in the assembly digital field. The digital field and the method have the advantages that the requirement of real time can be met in longer distance; the module of the assembly digital field can be disassembled and assembled arbitrarily, and can extract gait characteristics on multiple sports training events; and the athlete can correctly recognize the training effect of the athlete self through a sports effect evaluation system and an expert system, and adjust the training plan in real time. The digital field and the method can also be applied in the field of mode recognition.
Owner:ANHUI ZHONGKE BENYUAN INFORMATION TECH CO LTD
Error compensation model and algorithm implementation of high-precision pressure sensor
ActiveCN101201284AAchieve correctionReal-time correctionFluid pressure measurementMathematical modelSignal conditioning
The invention provides an error compensation model and an algorithm of a high precision pressure transducer. The invention uses an oven and a standard pressure source to collect the output data of the transducer under N temperature spots and M pressure spots to constitute an N*M matrix; a sensor output mathematical model is established, and the thermal compensation coefficients a(T), b(T), c(T) of the sensor output function, and the electrical null of the sensor under different temperatures are fit according to the collected data: U0(T)=f(T), and the parameters are written into a microprocessor; when the invention is used, the electrical null U0 of the restoration record transducer is clicked at the time point of zero pressure, and U0(T) is calculated through the information of the collected temperatures (T), and the time shift of the sensor within the use and compensation intervals is calculated out: delta=U0-U0(T); the microprocessor calculates the conditioner microprocessor output by collecting the information of the output signal (U) of the temperature transducer (T) and the pressure transducer according to the compensation formula: P=a(T)(U-delta)<2>+b(T)(U-delta)+c(T). The invention combines the design and production technologies of pressure sensors, the signal conditioning technology and the computer technology to achieve rectification of the pressure transducer in the wide temperature range. The pressure signal characteristic and effect is excellent.
Owner:SHANGHAI WENXIANG AUTOMOTIVE SENSORS
Battery charge state detecting method
InactiveCN105277898AImprove SOC estimation accuracyImprovement and perfection of SOC estimation functionElectrical testingElectrical batteryEngineering
The invention discloses a battery charge state detecting method. The method comprises the steps that the initial SOC of a battery is determined; the self-discharge effect of the battery is considered; a table look-up method is used to accurately estimate the SOC of the battery; an ampere-hour integral method is used to acquire the SOC estimation value of the battery of a next moment; a battery Thevenin model is combined, and an extended Kalman filter algorithm is used to correct the SOC of the battery; and finally, low power, over-current, over-temperature and the like of the battery are judged to carry out early warning and protection. According to the method provided by the invention, the influence of self-discharge of the battery on the battery capacity and the influence of temperature, the number of times of cycle charge and discharge and charge and discharge current on the rated capacity of battery are comprehensively considered, wherein self-discharge of the battery is caused by first time of running and downtime of the battery; error correcting is carried out on the SOC of the battery; and the accuracy is improved.
Owner:ZHEJIANG UNIV
Ultra-high-definition panoramic video real-time generation and multi-channel synchronous play system
ActiveCN103905741AReal-time stitchingReal-time correctionTelevision system detailsColor television detailsMulti cameraImage resolution
The invention provides an ultra-high-definition panoramic video real-time generation and multi-channel synchronous play system, and relates to the technical field of panoramic camera shooting. According to the system, on the basis of camera array imaging and collecting and by means of GPU high-speed parallel processing characteristics, the high-definition image real-time splicing, correcting, dimming, code compressing and transmission functions are achieved, a multi-channel panoramic multi-camera and an application system of the multi-channel panoramic multi-camera are designed, appropriate reprojection models are selected in a self-adaption mode for different shooting modes such as the cylindrical surface shooting mode and the spherical surface shooting mode, the problems that existing panoramic camera shooting devices in China are generally not high in stability, low in resolution, poor in expansibility, short of instantaneity and the like are successfully solved, the highest product resolution can reach 4320 p to 12960 p, and the frame rate is 30 fps.
Owner:HEFEI & EXHIBITION TECH
Apparatus and method for patient movement tracking
InactiveUS7498811B2Broaden the fieldReal-time correctionOptical detectionElectric/magnetic detectionFourier transform on finite groupsMedical imaging
The present invention relates, in general, to the field of motion tracking, and in particular to join a target in an MRI application. In particular the invention teaches an apparatus and method to track the movement of a target during medical imaging scanning using optical technology. Optical systems record the position and movement of the pattern and are able to perform mathematical analysis of the pattern to determine the positional shift of the patient. Weighted averages, Fourier transforms, Hadamard matrices and cross-correlation of data related to X-Y translation, rotation and scaling of the image of the pattern are used to analyze movement of the subject's head. Feedback related to the movement is provided to the MRI machine which allows for adjustments in focusing coils for real time tracking of the patient's movements during the MRI procedure. As a result, the MRI procedure becomes more accurate as it is adjusted for the patient's movements.
Owner:RGT UNIV OF TEXAS SYST EC32 +1
Accurate one-dimensional rotary and two-dimensional tilting table
InactiveCN101436436AImprove carrying capacityHigh adjustment accuracyInstrumental componentsPosition/direction controlEngineeringWork demand
Owner:TONGJI UNIV
Joint estimation and real-time correction method for channel error of TIADC system
InactiveCN102075464AReduce overheadAvoid introducingTransmitter/receiver shaping networksFast Fourier transformTime error
The invention discloses a joint estimation and real-time correction method for channel error of a time-interleaved ADC (TIADC) system. The method for implementing joint estimation comprises the steps of: sampling a single-tone signal with input frequency of f0 to obtain a sampling sequence xk(n) of various channels of the system, wherein k=0, 1, L M-1; performing fast Fourier transform (FFT) on sampling data x(n) which is reduced into a single-tone signal after the split joint; and in an FFT result, selecting a value FAk at the position where the frequency is 1fs / M+ / -f0,1=0, 1L M-1 and selecting a value FBk at the position where the frequency is 1fs / M,1=0, 1L M-1 to perform inverse fast Fourier transform (IFFT) to obtain M complex numbers, namely IAk and IBk, and finally, obtaining the joint estimation on time error delta tk, gain error gk, and offset error ok, k=0, 1, L M-1 through phase angle extraction and a modulus operation algorithm module. The method for implementing real-time correction comprises the step of: utilizing a comprehensive correction mechanism formed by a subtractor, a divider and a fractional delay filter to correct the offset error, the gain error and the time error existing in the sampling data of the channels respectively. By the method, joint estimation is performed on the three errors, SFDR of the sampling sequence is improved through the real-time correction, and a filter coefficient is not required to be updated or a correction module is not required to be redesigned even if channel errors are changed, so the aim of the real-time correction is fulfilled.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Array channel correcting method and device for time-division and duplex intelligent antenna
ActiveCN1747569AAchieve correctionReal-time correctionSpatial transmit diversityAntenna arraysTransceiverPhase difference
A method and equipment for correcting the amplitude and phase difference of array channels in a time-shared duplex intelligent antenna system is disclosed. Said method includes such steps as setting up a switch array in the front of transceiver of the first channel for switching between transmission and receiving and between up and down correcting links, performing up correction through outputting a known sequence to the transmitter of the first channel, connecting up correcting link, detecting the responses of all receiving channels and sampling while storing, or performing down correction through sequentially transmitting a known sequence to transmitters of N down channels, connecting down correcting link, detecting the known characteristic signal of the response from currently corrected channel, and sampling while storing, and calculating the correcting right of all up and down channels for weighting the wave beams.
Owner:ZTE CORP
Real-time sensorless brushless motor phase change phase correction method based on voltage of neutral points
InactiveCN104767435AReal-time correctionAchieving commutation phase correctionElectronic commutatorsBrushless motorsPhase correction
The invention discloses a real-time sensorless brushless motor phase change phase correction method based on the voltage of neutral points. By the adoption of the real-time sensorless brushless motor phase change phase correction method, the phase change position errors of a permanent-magnet brushless motor without a position sensor can be effectively reduced, and the optimum-position phase change is achieved. According to the real-time sensorless brushless motor phase change phase correction method, the voltage differences of neutral points within the 30-degree range on the front side and the 30-degree range on the rear side of a phase change point are collected and calculated so that the current phase error of the phase change can be determined, the voltage differences are used as phase change error feedback quantity, and real-time correction of the permanent-magnet brushless motor is achieved. Experiment results show that no matter whether the load is light or heavy, the phase change phase correction of the permanent-magnet brushless motor without the position sensor can be achieved.
Owner:SHANDONG UNIV
Method for determining location and movement of a moving object
InactiveUS20090039235A1Broaden the fieldReal-time correctionInstruments for comonautical navigationOptical detectionMedical imagingComputer science
The present invention discloses a method for determining location and movement of a moving object. One embodiment of the method tracks the movement of a target during medical imaging scanning and transmits the position shift to the medical imaging scanning device in real time. The method includes the steps of projecting structured light on the target, receiving the reflection of structured light, converting the received structured light into spatial positions, and transmitting the positional shift to the medical imaging scanning device. The method further includes the step of adjusting the medical imaging scanning device in response to the positional change to increase accuracy.
Owner:US GOVT AS REPRESENTED BY THE DEPT OF VETERANS AFFAIRS +1
Apparatus and method for tracking movement of a target
InactiveUS20110181893A1Broaden the fieldReal-time correctionOptical detectionUsing optical meansPhase correlationMedical imaging
The present invention discloses an apparatus and method to track the movement of a target. One embodiment tracks the movement of the patient during medical imaging scanning using optical technology. Optical systems record the position and movement of the target and provide inputs to a processor. The processor is capable of performing mathematical analysis of the movement of the target to determine the positional shift of the patient. Weighted averages, phase correlation, Fourier-Mellin algorithms, and cross-correlation of data related to X-Y translation are used to calculate movement of the target subject. Feedback related to the movement is provided to the medical imaging scanning machine which allows for adjustments in focusing coils for real time tracking of the patient's movements during the procedure. As a result, the medical image scanning procedure becomes more accurate as it is adjusted for the patient's movements.
Owner:BOARD OF RGT THE UNIV OF TEXAS SYST +1
Apparatus and method for tracking movement of a target
InactiveUS8390291B2Broaden the fieldReal-time correctionOptical detectionUsing optical meansPhase correlationMedical imaging
Owner:BOARD OF RGT THE UNIV OF TEXAS SYST +1
Model-free wavefront distortion correcting system based on spatial light modulator
InactiveCN101546037AReal-time correctionSolve the problem of wavefront distortionOptical elementsBeam splitterControl signal
The invention provides a model-free wavefront distortion correcting system based on a spatial light modulator. The system consist of a polarizing sheet 1, a telescopic system 2, a beam splitter prism 3, a shrinkage device 4, a CCD camera 5, a computer system 6, the spatial light modulator 7, a wavefront controller 8 and a monitoring camera 9. The common CCD camera is adopted to form images; a Strehl ratio of beams is analyzed according to the model-free iteration theory to obtain control signals of optimization parameters required by a wavefront corrector; the performance indexes of the system such as imaging definition, receiving light energy and the like are directly used as objective functions of an optimization algorithm to optimize and acquire the correction effect close to a diffraction limit; and the optimization parameters are calculated in parallel by a computer with a graph processor, the acquired multi-channel control signals are transmitted to the wavefront controller, and then the wavefront controller drives the spatial light modulator to achieve real-time correction of wavefront distortion phase so as to effectively solve the problem of wavefront distortion in atmospheric laser communication.
Owner:CHANGCHUN UNIV OF SCI & TECH
Method for determining location and movement of a moving object
InactiveUS7911207B2Broaden the fieldReal-time correctionInstruments for comonautical navigationOptical detectionMedical imagingComputer science
Owner:US GOVT AS REPRESENTED BY THE DEPT OF VETERANS AFFAIRS +1
Apparatus and method for tracking movement of a target
InactiveUS7977942B2Broaden the fieldReal-time correctionOptical detectionElectric/magnetic detectionPhase correlationMedical imaging
The present invention discloses an apparatus and method to track the movement of a target. One embodiment tracks the movement of the patient during medical imaging scanning using optical technology. Optical systems record the position and movement of the target and provide inputs to a processor. The processor is capable of performing mathematical analysis of the movement of the target to determine the positional shift of the patient. Weighted averages, phase correlation, Fourier-Mellin algorithms, and cross-correlation of data related to X-Y translation are used to calculate movement of the target subject. Feedback related to the movement is provided to the medical imaging scanning machine which allows for adjustments in focusing coils for real time tracking of the patient's movements during the procedure. As a result, the medical image scanning procedure becomes more accurate as it is adjusted for the patient's movements.
Owner:VETERANS AFFAIRS US GOVT AS REPRESENTED BY THE DEPT OF +1
Method of analyzing network attack situation
InactiveUS20050138425A1Accurately detected real timeAccurate detectionDigital data processing detailsMultiple digital computer combinationsNetwork sizeNetwork attack
Provided is a method for analyzing a network attack situation. The method categorizes network intrusion detection alerts into network attack situations, counts the frequency of same-featured intrusion alert occurrence for each network attack situation using a counting algorithm based on time slots, and analyzes the network attack situation based on the frequency of same-featured intrusion detection alert occurrence, the rate of same-featured intrusion detection alert occurrence, or an AND / OR combination of them. The network attack situation can be correctly detected in real time without relatively being influenced by the size of the network or amount of the occurrence of the intrusion detection alerts.
Owner:ELECTRONICS & TELECOMM RES INST
Method of compensating image quality during high-temperature object measurement
ActiveCN104748678AImage quality real-time correctionReal-time correctionImage enhancementTelevision system detailsCamera imageImaging quality
The invention belongs to the field of high temperature object measurement, in particular to a method of compensating image quality during high-temperature object measurement. The compensating method comprises the steps of illuminating the surface of a to-be-detected high temperature object by using an adjustable light intensity laser, and realizing effectively filtrating the radiant strong light of a plurality of high temperature objects after laser reflected by the surfaces of the high-temperature objects and radiant strong light of the high temperature objects are filtrated by an optical filter; making the camera image by the radiant strong light of the rest of parts of high temperature objects and the high temperature objects. The output light intensity output by a laser device can be adjusted in real time so that the laser device is matched with the changing tendency of the light intensity of the radiant light according to the light intensity changing tendency if radiant light in a filter piece pass-band at different temperatures, and the clear images of characteristic light bars of the high temperature objects can be realized in a large temperature gradient; furthermore, the compensation parameters of an assistant laser device can be adjusted in real time by a built compensation model, and the real-time correction of the image quality of the high temperature objects can be realized, so as to realize clearly acquiring the high temperature images at different temperatures.
Owner:DALIAN UNIV OF TECH
No-wavefront-detection adaptive optical system based on real-time phase difference technology
PendingCN107843982AReduce complexityImprove light energy utilizationOptical elementsBeam splitterPhase difference
The invention discloses a no-wavefront-detection adaptive optical system based on the real-time phase difference technology, belongs to the technical field of optics, and aims at problems of the conventional no-wavefront-detection adaptive optical technology. The system employs a method which comprises the steps: enabling the residual wavefront of to-be-corrected wavefront aberration after compensation through a deformation mirror to be transmitted to a beam splitter prism, dividing the residual wavefront into two beams through the beam splitter prism, converging the two beams to two CCD cameras through two imaging lenses, and obtaining focal plane and defocus plane fuzzy image patches; taking the image information as a known input quantity, directly solving a corresponding drive control voltage through a linear phase different algorithm module, driving a control circuit module to be applied to a deformation mirror through a wavefront corrector, and enabling the deformation mirror to generate a compensation quantity without wavefront distortion; collecting the focal plane and defocus plane images corresponding to the corrected system through an imaging system, recalculating a corresponding correction voltage at this moment, and carrying out the iteration of the above operations till the wavefront error is completely corrected. The system is used on an adaptive optical closed-loop system.
Owner:CHANGCHUN UNIV OF SCI & TECH
Data UE visual design system
PendingCN111190597AGuaranteed ease of usePowerful data visualization analysisDatabase management systemsVisual/graphical programmingVisual presentationData connection
The invention provides a data UE visual design system, which comprises a data management module used for obtaining source data through a local file uploading mode or a far-end database extraction mode, selecting a database needing to be configured with data connection, generating new data connection information, and then storing the collected source data into the database; a visual tool design module used for designing a visual interactive chart editing tool to serve as a display board for displaying data; a billboard editing module used for importing a billboard installation package from theoutside and installing a corresponding billboard; and a visual presentation module used for receiving an operation instruction of a user on a visual tool, dragging the corresponding interactive chartediting tool according to the operation instruction, and carrying out real-time updating presentation on the created data in a designed billboard style. According to the method, the usability is ensured, meanwhile, powerful data visual analysis, visual exploration and display functions are provided, and all requirements of organizations for data processing and operation analysis are fully met.
Owner:天津浪淘科技股份有限公司
Downlink active noise reduction device and method, and mobile terminal
InactiveCN105489212AImprove reception performanceImplement extractionSound producing devicesTelephone set constructionsEnvironmental noiseEngineering
The invention discloses a downlink active noise reduction device and method and a mobile terminal. The device includes: a first sound wave collector used for collecting an environmental noise signal, obtaining a reference signal, and outputting the reference signal to a self-adaptive controller; a self-adaptive controller used for calculating a secondary signal used for implementing sound wave counteraction based on the received reference signal and forwardly or reversely adjusting the amplitude and phase of the secondary signal based on a received error signal; a secondary sound field transmitter used for sending out the secondary signal adjusted by the self-adaptive controller in a sound wave form; and a second sound wave collector used for collecting the environment noise signal and the secondary signal, superposing the two signals, obtaining an error signal and outputting the error signal to the self-adaptive controller. Through the downlink active noise reduction device, active noise reduction is applied to a mobile phone, thereby improving a local call receiving effect, and the downlink active noise reduction device has good market prospects.
Owner:ZTE CORP
Three-phase electric quantity calculation method and apparatus thereof
ActiveCN102692556AHigh degree of intelligenceReal-time discoveryPower measurement by current/voltageTime integral measurementElectric energyThree-phase
The invention is suitable for the electric power field and provides a three-phase electric quantity calculation method and an apparatus thereof. The method comprises the following steps: detecting angles and amplitudes of a three-phase voltage and a three-phase current; forming a vector diagram according to the angles and the amplitudes of the three-phase voltage and the three-phase current and determining wiring of a three-phase electric energy meter according to the vector diagram; if false wiring is determined, calculating electric energy of the three-phase electric energy meter after the wiring of the three-phase electric energy meter is corrected to be the right wiring according to the wiring. By using the technical scheme provided in the invention, on-site measurement is not needed. According to the vector diagram provided by a metering chip, a grid company can discover the false wiring in real time and correct in real time. An intelligent degree is high.
Owner:SHENZHEN RENERGY TECH
Integrated multi-channel time-to-digital converter for time-of-flight pet
ActiveCN101467067AImprove time resolutionReal-time correctionTomographyX/gamma/cosmic radiation measurmentDigital down converterTimestamp
In a radiation detector (10) for a time of flight positron emission tomography (PET) scanner (2), a radiation sensitive member (20) generates a signal (22) indicative of a radiation detection event. A time to digital converter (34) includes digital delay elements (40) operatively interconnected as a ring oscillator (36, 36') and readout circuitry (50, 52, 60, 82, 84, 86, 88) configured to generate a timestamp for the radiation detection event based at least on a state of the ring oscillator when the signal is generated. Delay trim elements (46) operatively connected to the digital delay elements set a substantially common delay for the digital delay elements. Additionally or alternatively, the digital delay elements (40) include readout buffers (48') having transition times substantially longer than a delay of the digital delay elements, analog to digital converters (82, 84) digitize values of the delay elements, and decoding circuitry (86, 88) computes the state of the ring oscillator (36') based on the digitized values.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Correcting method for dynamic measured position of photoelectronic width measurer
InactiveCN1847781AHave the ability to identifyReal-time correctionUsing optical meansObservational errorOptical axis
The correcting method for dynamic measured position of photoelectronic width measurer is suitable for real-time correction of measurement error caused by the axial runout and inclination of the measured object during linear measurement of photoelectronic width measurer. The method includes extracting axial position information from the width information obtained with the detector so as to make the width measurer possess capacity of recognizing the object position in the optical axis direction and to constitute one integral width measuring and ranging measurement system; calibrating the video camera through experiment; and establishing the target axial runout and inclination correcting relationship with the correcting model, so that the photoelectronic width measurer can correct measurement error timely based on the position information during dynamic measurement.
Owner:SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
Defective pixel detecting and correcting method based on minimal mid-value gradient filtering
ActiveCN104463891AReal-time correctionBreach of integrityImage enhancementImage analysisComputer scienceImage edge
The invention discloses a defective pixel detecting and correcting method based on minimal mid-value gradient filtering. The method comprises the steps that a 5*5 Bayer array uses a pixel to be detected as the center, a center pixel is used as the datum, three gradient absolute values are calculated in the horizontal direction, the vertical direction, the diagonal direction and the clinodiagonal direction, the mid-value of the gradient absolute values in each direction is gained, and then the minimum value of the four mid-values is obtained to be used as the edge direction, namely the defective pixel checkout direction; in the minimum mid-value gradient direction, a defective pixel can be obtained when the requirement that the middle gradient absolute value is larger than the value which is integer multiples of the sum of the other two gradient absolute values in the same direction is met, the pixel value in the direction is used for verification, and otherwise, the pixel is a normal pixel and is output directly; for certain special range pixels, a more strict judgment condition is used for reducing missing inspection at edge pixels; for the diagonal position or the back-diagonal position, a more loose judgment condition is used for reducing missing inspection at the edge position when the gradient meets certain conditions. By means of the defective pixel detecting and correcting method based on minimal mid-value gradient filtering, the defective pixel can be filtered out quickly, the false detection rate and the missing detection rate are low, and image borders can be completely reserved.
Owner:XIDIAN UNIV
Method for correcting nonlinear sweep frequency of tunable laser in optical frequency domain reflectometer
ActiveCN109682403AReal-time correctionRequirements for downsamplingConverting sensor output opticallyOptical time-domain reflectometerSerial code
The invention discloses a method for correcting the nonlinear sweep frequency of a tunable laser in an optical frequency domain reflectometer. The method comprises the steps that firstly, a zero crossing point of an auxiliary interferometer is detected, then a correction coefficient is obtained through calculation according to a zero crossing point serial number difference, then the correction coefficient is used for correcting a main interferometer signal, the corrected signal is re-sampled through an interpolation method, and finally, the signal is converted to a frequency domain by using time-frequency transform, thereby compensating for the nonlinear sweep frequency of the laser. The method for correcting the nonlinear sweep frequency of the tunable laser in the optical frequency domain reflectometer has the advantages that a plurality of reflection points which are closer on sensing optical fiber can be distinguished, and the length of delay optical fiber of the auxiliary interferometer is not limited; in addition, the volume of processed data is smaller, the requirements for the sampling rate of a collecting card are reduced, and the method can reach longer measurement distance.
Owner:NANJING UNIV
Photovoltaic power station super-short-term power prediction device
InactiveCN105678396AImprove accuracyReal-time correctionClimate change adaptationForecastingData informationTime changes
The invention discloses a photovoltaic power station super-short-term power prediction device which comprises a meteorological data receiving device used for receiving predicted meteorological data of a photovoltaic power station in the future, a power station monitoring device used for measuring the real-time meteorological data and real-time power of the photovoltaic power station, a historical power generation server used for recording and collecting historical generated power and corresponding real-time meteorological data of the photovoltaic power station, a measured meteorological change system used for analyzing change information of the real-time meteorological data, a power prediction system used for processing the data information of the meteorological data receiving device and the historical power generation server to get a predicted value of power, and a power prediction correction system used for correcting the predicted value of power of the photovoltaic power station. According to the invention, real-time change information of meteorological elements is introduced into the power prediction correction system, and the predicted power of the photovoltaic power station is corrected according to the laws of real-time meteorological change on the prediction day. Thus, the accuracy of photovoltaic power station super-short-term power prediction is improved.
Owner:QUZHOU COLLEGE OF TECH
Successive approximation type analog-to-digital converter and error code detection based digital correction method thereof
ActiveCN104779954ACutting costsReal-time correctionAnalogue/digital conversion calibration/testingCorrection methodCapacitance
The invention discloses a successive approximation type analog-to-digital converter and an error code detection based digital correction method thereof. The correction method comprises steps as follows: 1) an initial value of a correction capacitor is set; 2) a digital correction logic circuit randomly acquires digital output codes of a converter; 3) the output codes are divided into two groups, namely, a group A and a group B, and the output codes are counted by 8-bit counters A and B; 4) if the overflow speed of the 8-bit counter B is higher than that of the 8-bit counter A, the correction capacitor is increased by 0.5 C; if the overflow speed of the 8-bit counter A is higher than that of the 8-bit counter B, the correction capacitor is decreased by 0.5 C; if the overflow speed of the 8-bit counter B is equal to that of the 8-bit counter A, the value of the correction capacitor is unchanged; 5) after Step 4) is finished, the digital correction logic circuit clears the 8-bit counters A and B, and Steps 2)-4) are repeated. According to the correction method, the specific correction process and the conversion process of the successive approximation type analog-to-digital converter are conducted synchronously, no additional correction period or correction time is required, real-time response can be made to PVT change, and the method has the advantage of capability of realizing real-time correction.
Owner:ZHEJIANG UNIV
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