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34 results about "Sky imaging" patented technology
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Multifunctional Sky Camera System for Total Sky Imaging and Spectral Radiance Measurement
InactiveUS20140320607A1Sunshine duration recordersImage enhancementSpatial light modulatorOptical flow
A multifunctional sky camera system and techniques for the use thereof for total sky imaging and spectral irradiance / radiance measurement are provided. In one aspect, a sky camera system is provided. The sky camera system includes an objective lens having a field of view of greater than about 170 degrees; a spatial light modulator at an image plane of the objective lens, wherein the spatial light modulator is configured to attenuate light from objects in images captured by the objective lens; a semiconductor image sensor; and one or more relay lens configured to project the images from the spatial light modulator to the semiconductor image sensor. Techniques for use of the one or more of the sky camera systems for optical flow based cloud tracking and three-dimensional cloud analysis are also provided.
Owner:IBM CORP
Method for short-term prediction of photovoltaic power generation power based on whole-sky imaging data
InactiveCN103886616AAccelerate the pace of replacementEnsure safetyImage analysisData processing applicationsPower stationShort terms
The invention discloses a method for short-term prediction of photovoltaic power generation power based on whole-sky imaging data. The method mainly comprises the steps that based on a preset threshold value, binarization processing is conducted on the whole-sky cloud image data; based on a binarization processing result, a cloud cluster is detected and marked; based on detecting and marking results, a mass center of the cloud cluster is extracted; based on an extraction result of the mass center of the cloud cluster, the movement speed and the movement direction of the cloud cluster are calculated through a plurality of adjacent images; based on calculation results of the movement speed and the movement direction of the cloud cluster, the time when a power station is shielded is analyzed and the change condition of the photovoltaic power generation power is predicated. According to the method for short-term prediction of the photovoltaic power generation power based on the whole-sky imaging data, the defects that stability is poor, the energy conversion efficiency is low, and the environmental protection property is poor in the prior art can be overcome and the method has the advantages that stability is good, the energy conversion efficiency is high, and the environmental protection property is good.
Owner:STATE GRID CORP OF CHINA +2
All-sky imaging instrument and cloud layer characteristic analysis method based on all-sky imaging instrument
InactiveCN103605171AAutomatic ObservationObservation is accurate and standardInstrumentsAnalysis methodSky imaging
The invention discloses an all-sky imaging instrument comprising a camera housing, a support arm, a shading band, a hemisphere mirror surface, a power supply and an electronic equipment case. The hemisphere mirror surface is fixedly arranged on the top of the electronic equipment case, the upward side of the surface of the hemisphere mirror surface is covered with the shading band, the camera housing is fixedly arranged on the electronic equipment case through the support arm, the camera housing is arranged over the hemisphere mirror surface, an image acquisition device is arranged in the camera housing, and the power supply is arranged in the electronic equipment case. A cloud layer characteristic analysis method based on the all-sky imaging instrument is also provided, and the cloud layer characteristic analysis method mainly comprises image preprocessing and binarization processing. On the premise of achieving low cost, the aims of automatic cloud observation and accurate and standard observation are achieved.
Owner:STATE GRID CORP OF CHINA +2
Sun irradiance predication method based on full-sky imaging equipment and device thereof
InactiveCN108121990AImprove accuracyImprove reliabilityImage enhancementImage analysisIlluminanceComputer science
The invention provides a sun irradiance predication method based on full-sky imaging equipment and a device thereof. The method comprises the steps of firstly determining a sun irradiance predicated value based on a cloud cluster track, determining a sun irradiance predicated value based on weather forecasting mode and a sun irradiance actual measured value, and finally realizing final predicationof the sun irradiance. In the sun irradiance predication method based on the full-sky imaging equipment, effect of cloud to the sun irradiance is considered in determining a clear sky irradiance; effect of quick cloud change to the sun irradiance is considered in determining a cloud cluster movement track; and furthermore in a process of determining the sun irradiance predicated value based on the weather forecasting mode, physical processes such as weather process and cloud change are considered; comprehensive consideration is realized and furthermore accuracy of a sun irradiance predicatedresult is improved.
Owner:CHINA ELECTRIC POWER RES INST +3
Cloud base height inversion method based on foundation cloud picture
ActiveCN107917880AImprove accuracyGood effectMaterial analysis by optical meansGeometric relationsCloud base
The invention relates to a cloud base height inversion method based on a foundation cloud picture. The cloud base height inversion method comprises the following steps: (1) selecting places, deployingtwo whole-sky imaging instruments, setting a field angle of the two whole-sky imaging instruments to be not greater than 130 degrees, enabling the two whole-sky imaging instruments to perform synchronous observation, and enabling the observed foundation cloud picture to have an overlapped area; (2) acquiring the foundation cloud picture synchronously observed by the two all-sky imaging instruments, performing the image matching for the two foundation cloud pictures, and selecting the overlapped area with the smallest difference; and (3) for a cloud cluster selected in the overlapped area in amatching manner, and a cloud base height is inversed by utilizing a geometric relation to obtain an inversion result. Compared with the satellite cloud picture observed from the cloud top in the existing inversion method, the foundation cloud picture is observed on the ground by the whole-sky imaging instruments, i.e., the foundation cloud picture is observed from the cloud base, so that the accuracy of the cloud base height inversion result is improved, and the effect is more significant for the thick cloud and the low cloud. In addition, the application range of the whole-sky imaging instrument is also expanded.
Owner:NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
Multifunctional Sky Camera System for Total Sky Imaging and Spectral Radiance Measurement
InactiveUS20140327769A1Sunshine duration recordersTelevision system detailsSpatial light modulatorOptical flow
A multifunctional sky camera system and techniques for the use thereof for total sky imaging and spectral irradiance / radiance measurement are provided. In one aspect, a sky camera system is provided. The sky camera system includes an objective lens having a field of view of greater than about 170 degrees; a spatial light modulator at an image plane of the objective lens, wherein the spatial light modulator is configured to attenuate light from objects in images captured by the objective lens; a semiconductor image sensor; and one or more relay lens configured to project the images from the spatial light modulator to the semiconductor image sensor. Techniques for use of the one or more of the sky camera systems for optical flow based cloud tracking and three-dimensional cloud analysis are also provided.
Owner:IBM CORP
Atmospheric parameter monitoring device and method based on multiband large-view-field sky imaging technology
InactiveCN107515044ASuitable for siting workSimple structurePhotometryMaterial analysis by optical meansData processing systemControl system
The invention provides an atmospheric parameter monitoring device and method based on the multiband large-view-field sky imaging technology. The device comprises a large-view-field optical telescope system, a multiband filtering switching and CCD imaging system, a telescope tracking control system and a control and data processing system, wherein the large-view-field optical telescope system is connected with the multiband filtering switching and CCD imaging system, the telescope tracking control system is parallel with the large-view-field optical telescope system and arranged on the large-view-field optical telescope system, the large-view-field optical telescope system is arranged on the control and data processing system, and the control and data processing system are used for controlling the large-view-field optical telescope system, the multiband filtering switching and CCD imaging system and the telescope tracking control system. The atmospheric parameter monitoring device is simple in structure, small in size, low in cost, capable of achieving automatic observation when being combined with a sun guide subsystem, capable of measuring solar halo intensity, capable of measuring multiple atmospheric parameters at the same time, and suitable for the site selection of a ground-based coronagraph.
Owner:YUNNAN ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI
Large-aperture spliced telescope co-phase method, device and equipment and storage medium
The invention discloses a large-aperture spliced telescope co-phase method, device and equipment and a storage medium, and the method comprises the steps: carrying out the star sky imaging through a large-view-field terminal, and obtaining first star point images of different view fields as a reference PSF image; translating the sub-mirror on the outermost ring of the spliced telescope to the maximum range to obtain second star point images of different fields of view as occlusion PSF images; performing Fourier transform on the reference PSF image and the shielded PSF image to obtain an OTF image difference, obtaining wrapping phases of different fields of view, and unwrapping the wrapping phases; and training a neural network by taking the phase information obtained after unwrapping and the conjugate graph thereof as inputs and taking the previous 37-order Zernike polynomial as an output, obtaining wavefront information of different fields of view through the trained neural network, and performing resolving to obtain the actual surface shape of the measured element. In this way, high-resolution wavefront detection data can be obtained by combining the OTF technology with the neural network, and the actual surface shape of the element can be accurately obtained.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Rainfall measurement method and system based on all-sky imager
The invention discloses a rainfall measurement method and system based on an all-sky imager. The method comprises the following steps: acquiring real-time cloud picture video data acquired by the all-sky imager; converting the cloud picture video data in a current preset time period into a plurality of single-frame image data, and converting each single-frame image data into a gray level image; subtracting two adjacent frames of gray level images to obtain a plurality of difference images; if a change value of each difference image in the current preset time period is greater than a preset threshold, determining a raindrop pixel area according to each difference image in the current preset time period, wherein the raindrop pixel area is an area occupied by the raindrop in the image; and determining a rainfall of the current preset time period according to the raindrop pixel area and a relationship between the preset raindrop pixel area and a raindrop volume. According to the invention,the real-time cloud picture video data is collected through the all-sky imager, the cloud picture video data is converted into the gray level image, the rainfall of the current preset time period isdetermined, and the accuracy of light rain and drizzle measurement is improved.
Owner:航天新气象科技有限公司
All-sky imager radiometric calibration method based on fixed star radiation spectrum and flux
ActiveCN112731569ASolve the difficult problem of radiation calibrationRadiation calibration is fast and accurateInstrumentsFixed starsPhoton radiation
The embodiment of the invention discloses an all-sky imager radiation calibration method based on a fixed star radiation spectrum and flux. The radiometric calibration method comprises the steps of selecting a target fixed star in an all-sky image, determining a zenith angle corresponding to the target fixed star at the moment of the all-sky image at an aurora observation station, and acquiring atmospheric transmissivity at the zenith angle corresponding to the target fixed star on an aurora observation spectral line according to the zenith angle; calculating to obtain photon radiation flux of the target fixed star on the aurora observation spectral line and a first solid angle corresponding to the target fixed star, and determining fixed star radiation brightness of the target fixed star according to the photon radiation flux and the first solid angle; and determining a detector output signal value corresponding to the target fixed star, and determining the radiation coefficient of the all-sky imager according to the detector output signal value, the atmospheric transmissivity and the fixed star radiation brightness. According to the technical scheme of the embodiment of the invention, radiometric calibration can be quickly and accurately carried out on the all-sky imager without geographical limitation, and the radiometric calibration of the all-sky imager is more flexible.
Owner:POLAR RES INST OF CHINA +1
Corrugated sensor, corrugation reconstruction method and application thereof
ActiveCN110231021AAvoid Misalignment Spot PhenomenonAvoid light energy lossPicture interpretationFlare phenomenonUnderwater
The present invention discloses a corrugated sensor, a corrugation reconstruction method and application thereof. The corrugated sensor comprises: a sampling array, for sampling the refracted light passing through the corrugation; a reflecting plate, wherein the reflecting plate comprises a light receiving surface, and the light receiving surface is configured to receive the sampled refracted light to form sampling spots; a first imaging element, for imaging the light receiving surface to obtain distribution information of the sampling spots; and a control element, for reconstructing the corrugation distribution according to the distribution information of the sampling spots, relative position information of the reflecting plate and the first imaging element, position information of the array unit in the sampling array corresponding to the sampling spot, and direction information of the incident light corresponding to the sampled refracted light. According to the technical scheme of the present invention, a reflecting plate is used as the spot imaging element for sampling the refracted light, so that the misalignment flare phenomenon of transmissive imaging is avoided, the depth applicable to the underwater is increased, and the imaging correction effect in the water surface-to-sky imaging application is improved.
Owner:SHENZHEN INST OF ADVANCED TECH
Satellite-to-ground camera imaging system for direction measurement of optical remote sensing satellite
PendingCN114088060ABoresight relationship is stableImprove mapping accuracyPhotogrammetry/videogrammetryImage matchingComputer science
The invention provides a satellite-to-ground camera imaging system for high-precision direction measurement of an optical remote sensing satellite, a field of view of a satellite-to-ground camera is divided into an over-the-sky field of view and an over-the-ground field of view, and the two fields of view are in a common-optical-path integrated design, so that a visual axis relation between an over-the-sky imaging module and an over-the-ground imaging module is stable; therefore, through common-path imaging on the sky and the ground and matching with other position resolving algorithms, high-precision calibration, positioning and even surveying and mapping tasks on the ground object position can be completed; based on the stable visual axis relation between a satellite-to-ground camera to the over-the-sky imaging module and the over-the-ground imaging module, the optical remote sensing satellite direction correction system firstly determines the visual axis direction of the to-the-ground imaging module in combination with the star map orientation acquired by the over-the-sky imaging module; and image matching is carried out according to image data obtained by ground imaging of the main camera and ground imaging data of the satellite-to-ground camera so as to further correct errors of the visual axis pointing of the main camera, so that the visual axis pointing of the main camera is calculated with high precision, and the surveying and mapping precision of the main camera is improved.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Solar irradiation modeling and forecasting using community based terrestrial sky imaging
ActiveUS10692013B2Weather condition predictionProbabilistic networksAtmospheric sciencesRemote sensing
Owner:INT BUSINESS MASCH CORP
Short-time cloud picture tracking method based on optical flow method
ActiveCN111583298AExact edge shapeAccurate predictionImage enhancementImage analysisOptical flowAtmospheric sciences
The invention discloses a short-time cloud picture tracking method based on an optical flow method. The method comprises: firstly, collecting real-time sky pictures through an all-sky imager, and removing irrelevant factors such as buildings in the images are removed; secondly, utilizing RBG color information of the image to separate pixels of the cloud from pixels of the sky; and finally, comparing the same cloud pixels of the two frames to obtain an edge position and a speed vector of the cloud, predicting the edge position of the cloud at the next moment, and comparing the edge position with the sun position to realize prediction. The method can achieve the recognition and prediction of the position of the cloud picture, is higher in accuracy, is high in speed, is high in universality,is good in robustness, and can be used for an irradiation intensity prediction or solar photovoltaic power output prediction system.
Owner:杭州远鉴信息科技有限公司 +1
Intelligent geographic locating system by imaging of sky, and method for geographic locating
PendingUS20220113136A1Instruments for comonautical navigationNavigation by speed/acceleration measurementsReal-time dataComputer graphics (images)
An autonomous system for geographic locating may include a camera unit capable of capturing a present time image of a night sky, a processor operable to execute instructions accessible in memory, the processor capable of implementing a machine learning positioning algorithm comprising a finite sequence of instructions, the machine learning positioning algorithm comprising a training module operable in a training mode with a training dataset to train same, the machine learning positioning algorithm including a prediction module operable in a prediction mode with a live dataset to provide a prediction of an inferred geographic location of capturing the present time image.
Owner:TERRADEPTH INC
Aurora activity monitoring system
ActiveCN104113736AGood value for moneyReduce volumeTelevision system detailsColor television detailsCamera controlDigital video
The invention relates to an aurora monitoring system. The aurora monitoring system comprises a fish-eye lens for aurora full-sky imaging, a low-light industrial camera for converting the aurora full-sky imaging into an aurora analog video signal, a camera controller for controlling the low-light industrial camera, and a video encoder for converting the aurora analog video signal into a digital video and providing the outside with an online video streaming function by connecting the digital video with a network, wherein the fish-eye lens is installed at the front end of the low-light industrial camera, the low-light industrial camera is connected with the video encoder through a bayonet nut connector (BNC) cable, and the camera controller is electrically connected with the low-light industrial camera. According to the aurora monitoring system, good aurora imaging is achieved under an extreme weak light condition, the online video streaming function can be provided, automatic unattended observation is achieved, and the aurora monitoring system has the advantages of being convenient to install and operate, low in cost, good in imaging quality, and capable of performing on-line video streaming output, timing image capture, and meeting requirements of aurora activity real-time monitoring.
Owner:POLAR RES INST OF CHINA
A Real-time Dynamic Cloud Cover Inversion Method Based on Ground-Based Cloud Image
Owner:NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS +1
Geometric calibration method of all-sky imager based on gradient descent method
PendingCN112799144AFast and accurate geometric calibrationTroubleshooting Recalibration DifficultiesOptical detectionICT adaptationSky imagingZenith
The embodiment of the invention discloses a geometric calibration method of an all-sky imager based on a gradient descent method. The geometric calibration method comprises the following steps: selecting a target star point in an all-sky image, and determining star point position coordinates of the target star point in an all-sky image coordinate system and a real azimuth angle and a real zenith angle of the target star point at an aurora observation station at the moment of the all-sky image; constructing an error function based on the real azimuth angle and the zenith position and the geographic orientation in the all-sky image, and determining a real zenith position and a real geographic orientation according to the error function; and determining the imaging radius of the target star point according to the star point position coordinates and the real zenith position, and obtaining the relation between the imaging radius and the real zenith angle in the all-sky image through fitting according to the real zenith angle and the imaging radius. According to the technical scheme of the embodiment of the invention, geometric calibration can be quickly and accurately carried out on the all-sky imager without being limited by regions, and the geometric calibration of the all-sky imager is more flexible.
Owner:POLAR RES INST OF CHINA +1
A Cloud Base Height Retrieval Method Based on Ground-Based Cloud Image
ActiveCN107917880BImprove accuracyGood effectMaterial analysis by optical meansGeometric relationsCloud base
The invention relates to a cloud base height inversion method based on a foundation cloud picture. The cloud base height inversion method comprises the following steps: (1) selecting places, deployingtwo whole-sky imaging instruments, setting a field angle of the two whole-sky imaging instruments to be not greater than 130 degrees, enabling the two whole-sky imaging instruments to perform synchronous observation, and enabling the observed foundation cloud picture to have an overlapped area; (2) acquiring the foundation cloud picture synchronously observed by the two all-sky imaging instruments, performing the image matching for the two foundation cloud pictures, and selecting the overlapped area with the smallest difference; and (3) for a cloud cluster selected in the overlapped area in amatching manner, and a cloud base height is inversed by utilizing a geometric relation to obtain an inversion result. Compared with the satellite cloud picture observed from the cloud top in the existing inversion method, the foundation cloud picture is observed on the ground by the whole-sky imaging instruments, i.e., the foundation cloud picture is observed from the cloud base, so that the accuracy of the cloud base height inversion result is improved, and the effect is more significant for the thick cloud and the low cloud. In addition, the application range of the whole-sky imaging instrument is also expanded.
Owner:NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
Solar energy resource ultra-short time forecasting method based on ground-based cloud picture
ActiveCN112989709ARealize ultra-short-term forecasting methodForecastingDesign optimisation/simulationSolar ResourceComputer science
The invention provides a solar energy resource ultra-short time forecasting method based on ground-based cloud pictures. The solar energy resource ultra-short time forecasting method comprises the following steps: determining historical cloud information based on a plurality of original ground-based cloud pictures obtained by an all-sky imager in a past preset time period; establishing a cloud cover forecasting model according to the historical cloud information; determining a forecast cloud cover according to the cloud cover forecasting model, wherein the forecast cloud cover is the cloud cover in a future preset time period; establishing a clear sky radiation forecast model according to historical clear sky radiation data in a past preset time period; establishing a cloud attenuation model according to the historical cloud information; determining a cloud sky radiation model according to the clear sky radiation forecast model and th'e cloud attenuation model; and determining solar radiation output in the future predetermined time period by using the cloud sky radiation model according to the forecast cloud amount.
Owner:中国气象局公共气象服务中心 +1
A method for ultra-short-term forecasting of solar energy resources based on ground-based cloud images
ActiveCN112989709BRealize ultra-short-term forecasting methodForecastingDesign optimisation/simulationSolar ResourceComputer science
Owner:中国气象局公共气象服务中心 +1
Radiation calibration method of all-sky imager based on stellar radiation spectrum and flux
ActiveCN112731569BSolve the difficult problem of radiation calibrationRadiation calibration is fast and accurateInstrumentsRadianceTransmittance
Owner:POLAR RES INST OF CHINA +1
A Calibration Method for All-Sky Imager Based on Sun Azimuth
The invention discloses a total sky imager calibration method based on solar azimuth. The method comprises the following steps that: S1: a total sky imager is fixedly installed, and the longitude andthe latitude of the total sky imager can be recorded; S2: the total sky imager collects and obtains a plurality of first foundation cloud atlases, and the photographing time of each first foundation cloud atlas is recorded; S3: a solar center-of-mass coordinate in each foundation cloud atlas can be obtained through image recognition; S4: according to the photographing time as well as the longitudeand the latitude, the solar elevating angle Hs and the first solar azimuth angle As of the sun are calculated; and S5: according to the solar center-of-mass coordinate, the solar elevating angle Hs and the first solar azimuth angle As, the model parameter fitting of the total sky imager can be carried out to finish the calibration of the total sky imager. The method has the technical characteristics of being accurate, efficient and convenient in calibration and low in calibration cost, and assists in cloud atlas prediction.
Owner:ZHEJIANG SUPCON SOLAR TECHNOLOGY CO LTD
All-sky imager calibration method based on lunar orientation
PendingCN114663490AAvoid the influence of calibration result errorQuick calibrationImage analysisElevation angleLongitude
The invention relates to the field of meteorological instrument calibration, in particular to an all-sky imager calibration method based on lunar orientation, which comprises the following steps: S1, fixing and installing an all-sky imager, and recording the longitude and latitude of the installation position of the all-sky imager; s2, setting the shooting interval of the all-sky imager, automatically collecting and obtaining a series of first foundation cloud pictures, and recording the shooting date and shooting time of each first foundation cloud picture; s3, carrying out image recognition to obtain a centroid coordinate of the moon in the first foundation cloud picture; s4, calculating the lunar elevation angle H and the lunar azimuth angle L at each shooting time according to the shooting date, the shooting time and the longitude and latitude of the installation position; and S5, performing parameter fitting on the all-sky imager according to the coordinates of the centroid of the moon, the elevation angle of the moon and the azimuth angle of the moon so as to complete calibration of the all-sky imager. The method has the technical characteristics of simplicity and rapidness in calibration, high calibration precision and low calibration cost.
Owner:CHINA THREE GORGES CORPORATION +1
Regional power grid load prediction method and device based on heterogeneous meteorological data fusion
ActiveCN113642676AImprove the speed of predictionImprove forecast accuracyForecastingCharacter and pattern recognitionData setLoad forecasting
The invention relates to a regional power grid load prediction method and device based on heterogeneous meteorological data fusion, which belong to the technical field of electric power, and solve the problems of low power grid load prediction accuracy and low power grid load prediction speed caused by existing meteorological data. The method comprises the following steps of determining meteorological data influencing a load in each meteorological sub-region in a regional power grid, wherein the meteorological data comprises cloud picture data shot by an all-sky imager, preprocessing the meteorological data, establishing a cloud picture classification and discrimination model of a Gabor filter-convolution automatic encoder, and performing prediction and classification processing on the preprocessed cloud picture data by using the discrimination model, fusing the classified cloud picture data and other meteorological data to form a meteorological data set, wherein the other meteorological data comprise air pressure, temperature, precipitation, relative humidity, wind speed, wind direction, date type and cloud picture data, establishing a load prediction model, and predicting the load of each meteorological zone by using the load prediction model. And the accuracy and speed of load prediction are improved.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Regional power grid load prediction method and device
ActiveCN113642677AImprove forecast accuracyReduce feature dimensionForecastingCharacter and pattern recognitionData setData information
The invention relates to a regional power grid load prediction method and device, which belong to the technical field of electric power, and solve the problem that data information contained in unstructured meteorological factors is lost when modeling is carried out through structured meteorological data, so that the accuracy of load prediction is influenced. The method comprises the steps of determining meteorological data influencing loads in all meteorological partitions in a regional power grid, wherein the meteorological data comprise air pressure, temperature, precipitation, relative humidity, wind speed, wind direction, date types and cloud picture data obtained through shooting of an all-sky imager, preprocessing the meteorological data, establishing a cloud picture classification and discrimination model of a Gabor filter-convolutional neural network, and performing prediction and classification processing on the preprocessed cloud picture data by using the discrimination model, fusing the classified cloud picture data with other meteorological data to form a meteorological data set, establishing a load prediction model, and predicting the load of each meteorological partition by using the load prediction model. And the accuracy and precision of load prediction are improved.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
A method and system for measuring rainfall based on an all-sky imager
ActiveCN112162337BImprove accuracyRainfall/precipitation gaugesICT adaptationDrizzleAtmospheric sciences
The invention discloses a rainfall measurement method and system based on an all-sky imager. The method includes: acquiring real-time cloud image video data collected by an all-sky imager; converting cloud image video data in a current preset time period into multiple single frames Image data, and convert each single-frame image data into a grayscale image; subtract two adjacent grayscale images to obtain multiple difference images; if the change of each difference image within the current preset time period If the value is greater than the preset threshold, the pixel area of the raindrop is determined according to the difference images in the current preset time period, and the pixel area of the raindrop is the area occupied by the raindrop in the image; according to the pixel area of the raindrop and the relationship between the pixel area of the raindrop and the volume of the preset raindrop , to determine the rainfall for the current preset time period. The invention collects real-time cloud image video data through an all-sky imager, converts the cloud image video data into a grayscale image, determines the rainfall in the current preset time period, and improves the accuracy of light rain and drizzle measurement.
Owner:航天新气象科技有限公司
Method and system for predicting surface irradiance through sky image-irradiance model
ActiveCN111292229BHigh precisionImage analysisWeather condition predictionImage extractionIlluminance
The invention discloses a method and system for predicting the irradiance of the ground surface through a sky image-irradiance model. The method proposed by the invention includes the following steps: establishing a prediction model of the irradiance of the ground surface, and using historical sky images to extract features to obtain the The surface irradiance prediction model is trained; a plurality of current sky images separated by a first preset time period are obtained; the current sky image is corrected to obtain a corrected current sky image; cloud displacement vector calculation method is used to obtain Cloud cluster displacement vector between adjacent sky images; Obtain the cloud cluster information that will block the sun part within the second preset time end for each current sky image; Obtain the first average RGB value and the first distance value; The mirror surface used by the sky imager is a fisheye convex mirror, so there is a certain distortion in the captured sky image; after correction processing, the accuracy of the first average RGB value and the first distance value can be improved.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
Multi-view-field starry sky observation satellite target attitude planning method
PendingCN114061594AGuaranteed validityImprove the quality of observationInstruments for comonautical navigationPhotogrammetry/videogrammetryFixed starsObservation point
The invention relates to a multi-view-field starry sky observation satellite target attitude planning method, which comprises the following steps of: 1, acquiring seasons or months of starry sky observation of a satellite, a satellite orbit height and a stray light suppression angle of imaging optical equipment; 2, according to the projection relation between the selectable view field and the observable sky area of the optical equipment, providing the selectable sky area of each piece of optical equipment; 3, selecting an observation point set according to the distribution of fixed stars in the selectable sky area, obtaining the direction of each optical device under the observation point under the celestial coordinate system, judging whether the optical device is in the available sky area, and deleting unavailable observation points; 4, counting the number of fixed stars in the field of view of the camera under the available observation points, and optimizing the available observation points; and 5, repeating the steps 3 and 4 until a satisfactory observation point set is found, and outputting the right ascension and declination of the optimal observation point and a satellite attitude conversion matrix. According to the invention, ideal observation sky areas and target attitudes are provided for multi-view-field star sky imaging of remote sensing satellites and astronomical observation satellites.
Owner:CHINA ACADEMY OF SPACE TECHNOLOGY
Cloud cluster height estimation method and system using sky images
ActiveCN111402312ASimple methodEasy to operateImage analysisInformation technology support systemComputational physicsOptical flow
The invention discloses a cloud cluster height estimation method and system using sky images. The method comprises the following steps: obtaining a first sky image shot by a first sky imager and a second sky image shot by a second sky imager at the same moment, and the first sky imager and the second sky imager are located at different positions of the same photovoltaic station; obtaining a movingdistance between a first point in the first sky image and a second point in the second sky image registered by the first point according to an optical flow method; and obtaining a height estimation value of the actual cloud cluster according to the positions of the first point and the second point; according to the method, the cloud cluster height can be estimated only through related parametersof two sky imagers, the method is simple and easy to operate, the blank of the technology for estimating the cloud cluster height of the photovoltaic station at the present stage is filled up, and therefore certain data support is provided for photovoltaic power generation power minute-level prediction.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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