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97results about How to "Improve accuracy and precision" patented technology

Recognizing method and recognizing device for human body position and air conditioner

The invention discloses a recognizing method and a recognizing device for a human body position and an air conditioner. The recognizing method comprises the steps of: transmitting a detection signal with a Doppler sensor and receiving an echo signal generated after the detection signal meets a target human body; acquiring echo energy in the echo signal; determining a coordinate curve of the echo energy in a polar coordinate system with the position of the Doppler radar sensor as the pole; acquiring an energy equation corresponding to the coordinate curve, wherein the relative distance is the distance from the target human body to the Doppler sensor, and the relative angle is the movement angle of the target human body relative to the Doppler sensor; calculating a position equation of the target human body according to the energy equation; and determining the spatial position of the target human body according to the position equation and the energy equation. With the recognizing method and the recognizing device, the problem that the position of a human body cannot be accurately recognized in the prior art is solved, and an effect of improving the accuracy and precision of human body position recognizing is achieved.
Owner:GREE ELECTRIC APPLIANCES INC OF ZHUHAI

Time matching method of longitudinal wave and converted shear wave seismic data

The invention discloses a time matching method of longitudinal wave and converted shear wave seismic data. The time matching method comprises the following steps: respectively performing horizon interpretation on key horizons of the longitudinal wave and converted shear wave seismic data, and using times of longitudinal wave and converted wave in the key horizons to calculate an initial speed ratio of the longitudinal wave and transverse wave, and carrying out initial time matching on a seismic section of converted wave by using the initial speed ratio; using a disturbance method of the speed ratio of the longitudinal wave and transverse wave to perform correlation-spectra analysis on a converted wave initial time matching section and a longitudinal wave section, and picking up the disturbance quantity of the speed ratio; using the disturbance quantity to correct the initial speed ratio to obtain a speed ratio of longitudinal wave and transverse wave based on horizon interpretation and fine disturbance, and using the speed ratio to convert time of the converted wave section to a longitudinal wave two-way time. After the time matching of a longitudinal wave section and a converted wave section is realized through the method provided by the invention, and the consistency of the formation and the wave group of the converted wave section with the time of the longitudinal wave section is good, so that a good material is provided for subsequent combined application.
Owner:CHINA PETROLEUM & CHEM CORP +1

Remote sensing survey method and system for estimating tree coverage percentage of city

The invention discloses a remote sensing surveying method used for estimating the urban tree coverage rate with high precision and a remote sensing surveying system thereof. The method comprises the following steps: S110, a multispectral remote-sensing image is utilized to carry out the partition aiming at extracting crown coverage areas; S120, aiming at the image areas generated by the partition, a fuzzy classifier is built to carry out the tree coverage classification of oriented objects; S130, the precision evaluation of the classified result is carried out; and S140, the urban tree coverage rate is calculated according to the classified tree coverage area. According to the invention, the actual crown ground cover area which is accordant with each tree in an urban area is extracted from the remote sensing images with high resolution, then the total area of the tree coverage in the urban area is calculated according to the pixel ground resolution of the remote sensing images, and finally, the tree coverage rate in the urban area is obtained. Compared with a tree coverage rate calculating method applied currently, the invention has the advantages that the estimation precision is obviously improved, and the actual position of the crown layer ground coverage area of each tree can be obtained.
Owner:BEIJING JIAOTONG UNIV

Short-term power forecasting method of photovoltaic power station based on a Kmeans-GRA-Elman model

The invention relates to a short-term power forecasting method of a photovoltaic power station based on a Kmeans-GRA-Elman model. The method includes the steps of: collecting the power generated everyday in the history of photovoltaic power station and the meteorological parameters of the corresponding time period on the meteorological station every day; preprocessing the data; using the six statistical indexes and the improved Kmeans algorithm to cluster the samples from the first day of the historical day to the day before the forecast day, and determining the number of categories accordingto the contour coefficient; calculating a center point of each clustering meteorological eigenvalue, and judging a category to which the forecast day belongs; determining the similarity date and thebest similarity date of the date to be forecasted; determining the parameters of an Elman neural network; obtaining the training model; inputting the parameters of the best similar day and the meteorological parameters of the day to be forecasted into the training model to forecast the power generation on the day to be forecasted. The invention can improve the accuracy and accuracy of short-term power prediction of the photovoltaic power station under different weather conditions in different seasons.
Owner:FUZHOU UNIVERSITY

Method and device for recognizing hidden reservoirs by underground reverse-time migration imaging

ActiveCN103758511AEliminate the effect of direct wavesImprove accuracy and precisionBorehole/well accessoriesElectricityReflected waves
The embodiment of the invention provides a method and a device for recognizing hidden reservoirs by underground reverse-time migration imaging. The method comprises the following steps: obtaining remote-exploration sound wave logging information and general and electro-imaging logging information relating to the same; pretreating the remote-exploration sound wave logging information, and extracting longitudinal and transverse wave time different information; extracting reflected wave information from the remote-exploration sound wave logging information by using a multi-scale relevant comparison method; generating reverse-time migration imaging result according to the longitudinal and transverse wave time different information and the reflected wave information by using a seismic pre-stack reverse-time migration algorithm; determining position and depth of the hidden reservoir according to the reverse-time migration imaging result by combining with the general and electro-imaging logging information. According to the method and the device for recognizing the hidden reservoirs by underground reverse-time migration imaging, the veracity and the accuracy of the reverse-time migration imaging can be improved, very good application effect in field application of oil fields are achieved, and the missing rate of the hidden reservoirs are effectively lowered.
Owner:PETROCHINA CO LTD

Three-dimensional digital imaging sensor, three-dimensional scanning system and scanning method

The invention relates to a three-dimensional scanning system and a scanning method. The three-dimensional scanning system is used for acquiring the three-dimensional point cloud data of an object to be detected. The system comprises a light source, left and right cameras, a three-dimensional module group, a stripe matching module and a three-dimensional reconstruction module, wherein the light source is used for projecting a plurality of stripe patterns on the object to be detected; the left and right cameras are used for acquiring a 2D left image and a 2D right image of the object to be detected; the three-dimensional module group is used for collecting the depth map of the object to be detected; the stripe matching module is used for guiding left and right image stripes to match according to the depth map; the three-dimensional reconstruction module is used for searching the corresponding relation of a single point in a corresponding stripe center line segment through using the polarline geometric constraint relation of the left and right cameras in the matched and corresponding stripes of the left and right images, and then reconstructing the corresponding point into the three-dimensional point cloud data according to the calibration parameter of the three-dimensional scanning system. The invention provides the scanning method of a three-dimensional scanner.
Owner:SHINING 3D TECH CO LTD

Digital intermediate frequency signal processing apparatus capable of improving polarimetric synthetic aperture radar (Pol-SAR) channel consistency

The invention discloses a digital intermediate frequency signal processing apparatus capable of improving polarimetric synthetic aperture radar (Pol-SAR) channel consistency and relates to the Pol-SAR technology. A data acquisition chip is moved forward to a rear end of a band pass filter and intermediate frequency amplifier. The intermediate frequency in a receiving path can be directly sampled. The apparatus of the invention carries out sampling and digitization to a plurality of polarimetric channel signals of the Pol-SAR at the intermediate frequency, performs quadrature demodulation and filtering to intermediate frequency signals in a digital domain so as to obtain digital video signals and simultaneously performs related digital signal processing to the digital video signals. By using the apparatus of the invention, Pol-SAR channel consistency can be substantially improved; remote sensing precision and accuracy of Pol-SAR can be effectively raised; problems existing in Pol-SAR echo receiving treatment by using a traditional method can be avoided; a quantity of collected channels can be reduced. Using the apparatus is good for miniaturization of a Pol-SAR system.
Owner:INST OF ELECTRONICS CHINESE ACAD OF SCI

Background model based on multiple information integration

The invention discloses a background subtraction implementation method and device. The method comprises the following steps: calculating the current observation mode of each pixel of the current input image by combining local spatial information with color information; comparing the current observation mode of each pixel with all modes in a background model, and finding out a background model mode which is closest to the current observation mode distance; if the current observation mode distance is less than the scheduled threshold, judging the closest background model mode as a background, otherwise judging the closest background model mode as a foreground; and updating the background model according to the judgment conditions of the foreground and the background. Aiming at the problems in the prior art, in the method provided by the invention, the pixel information is combined with space structure information to describe the observation mode of each pixel, and a hybrid Gaussian model frame is adopted to build a hybrid Gaussian background model with the combination of the pixel information and the space structure information, thus the extraction performance of the foreground is greatly promoted, and the extractive precision and accuracy of the foreground are effectively improved.
Owner:BEIJING SAFE VISION TECH

Method, device and system of bibliography repeat removal

The invention provides a method, a device and a system of bibliography repeat removal. The method includes obtaining the bibliography information of a plurality of reference bibliographies; for every reference bibliography, comparing the bibliography information of a bibliography to be retrieved with the bibliography information of the reference bibliography to obtain the similarity between the bibliography and the reference bibliography; and setting the reference bibliographies with the similarity less than or equal to a first threshold value as non-repetitive bibliographies. The method of the bibliography repeat removal compares the bibliography information of the bibliography to be retrieved with the bibliography information of the reference bibliographies after obtaining the bibliography information of the plurality of the reference bibliographies to obtain the similarity between the bibliography and the reference bibliographies and sets the reference bibliographies with the similarity less than or equal to the first threshold value as the non-repetitive bibliographies, thereby obtaining the non-repetitive bibliographies rapidly and achieving high-efficiency bibliography repeat removal, and meanwhile, improving the accuracy and precision of retrieving the non-repetitive bibliographies and reducing the subsequent manual treatment cost.
Owner:NEW FOUNDER HLDG DEV LLC +1

Method for determining integral time of off-axis camera

ActiveCN106559665AThe calculation formula is accurate and reasonableImprove accuracy and precisionTelevision system detailsColor television detailsComputer visionKinematic theory
The invention relates to a method for determining integral time of an off-axis camera. With the method provided by the invention, a problem of deviation existence of integral time calculation of the off-axis camera by the traditional method can be solved. The kinematics theory and the solid geometry method, calculation is carried out by using a satellite track, an attitude, and an imaging point parameter to obtain a ground velocity vector; a vector triangle of a ground speed vector, an image speed vector, and an optical axis vector is constructed and is solved to calculate an image speed value and an image speed vector; and calculation is carried out by using parameters like a camera pixel size, a focal length, and a photograph point slope distance, thereby obtaining precise off-axis camera integral time. The method is simple, efficient, accurate, and reasonable. The deviation caused by the traditional coordinate conversion method can be eliminated; on the basis of the accurate analysis of a related physical quantity relationship, the integral time of the off-axis camera is calculated precisely, so that the accuracy of the CCD integral time calculation result can be improved, the satellite imaging quantity can be improved, and the precision in engineering application can be enhanced; and the calculation method of the drift angle of the off-axis camera can be deduced. The method is also suitable for a coaxial camera, so that the applicability of the method is high.
Owner:BEIJING INST OF SPACECRAFT SYST ENG

Duty ratio design method and system for eliminating current sampling interference, medium and equipment

The invention provides a duty ratio design method and system for eliminating current sampling interference, a medium and equipment. The duty ratio design method for eliminating current sampling interference comprises the following steps: synchronizing the clock signal of a power factor corrector with the clock signal of a frequency converter to enable the clock signals used by the power factor corrector and the frequency converter to be the same; under the same clock signal, setting the switching frequency of the power factor corrector to be a fixed multiple of the switching frequency of the frequency converter; setting the sampling time of the frequency converter according to the parity of the fixed multiple; and obtaining the size relationship between the duty ratio time and the samplingtime of the frequency converter through comparison, and performing phase shift on the duty ratio of the power factor corrector according to the comparison result, wherein the duty ratio time and theduty ratio of the power factor corrector are determined according to the switching period of the power factor corrector. Through the PFC duty ratio control method provided by the invention, the problem of current sampling interference generated in an occasion where the PFC and the frequency converter are used at the same time is solved.
Owner:RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD

Single-inductive and double-pneumatic cylinder perforating fixture

The invention discloses a single-inductive and double-pneumatic cylinder perforating fixture. The fixture comprises a fixed disc; arc grooves are uniformly distributed in the fixed disc; a drill bit groove is formed in one surface of the fixed disc, and a cylinder groove is formed in the other surface; a drill bit hole is formed in the drill bit groove; an alignment hole is formed in one side of the drill bit hole; two arc plates controlled by pressing cylinders and an arc plate connected through a spring are arranged in the cylinder groove; and the two pressing cylinders are controlled through a sensor to extend and retract. The fixed disc is provided with the drill bit groove in one surface and the cylinder groove in the other surface; the drill bit groove is used for determining the position of a drill bit in perforation; the drill bit hole is used for perforating a cylinder by the drill bit; the arc grooves position and fix the fixed disc on a base required for perforation, and can realize the movement of the fixed disc; the arc plates in the cylinder groove satisfy the clamping of materials with different thicknesses; and after all steps are finished, the cylinder is perforated, so that the perforation accuracy and precision are greatly improved.
Owner:SUZHOU WUZHONG DISTRICT DALU ELECTRIC EQUIP FACTORY
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