48 results about "Luminosity" patented technology

The invention relates to an asteroid global terrain three-dimensional reconstruction method for illumination variation, and the method comprises the following steps: inputting an asteroid optical image, estimating the pose of a camera, generating a sparse point cloud, and initializing a Gaussian radiation field; using the image segmentation large model to output a segmentation mask of the asteroid optical image, and pruning the Gaussian radiation field; identifying a shadow region on the surface of the asteroid by combining a # imgabs0 # mixed mask output by a Gaussian radiation field; the camera position, the spherical harmonic coefficient and the Hash code are combined with the angle of the incident light to be input into a neural network, and color values of Gaussian primitives of illumination and shadow areas are regressed; depth normal consistency loss and rotation variance and scale constraint loss are added, optimization of a Gaussian radiation field is jointly supervised in combination with luminosity loss, a Gaussian opacity field is calculated, and a three-dimensional model of the asteroid global terrain is extracted. According to the method, the shadow region on the asteroid can be identified, and the three-dimensional reconstruction precision of the asteroid with surface illumination variation is improved.

The invention discloses a space target luminosity dynamic measurement ground experiment system, and the system comprises a multi-degree-of-freedom controllable rotary table which is connected with a satellite scaling model and is used for driving the satellite scaling model to rotate and adjust at multiple angles; the visible light detection unit is positioned in the reflection light path direction of the satellite scaling model and is used for imaging the satellite scaling model and generating a continuous observation image sequence; the light source unit is used for simulating a parallel light source of the sun, and the light source directly irradiates the satellite scaling model; and a master control unit. And the master control unit is used for controlling the intensity of the light source, the motion parameters of the rotary table and image acquisition, and carrying out downsampling processing on image data to generate a luminosity sequence for simulating long-distance observation. The technical scheme provided by the invention can provide reliable technical support for space target identification, orbit prediction and stealth technical verification, and has innovativeness, practicability and economical efficiency.

It is preferable that a single gas analyzer be capable of handling a wide measurement range. [Solution] A first reference relationship between a wavelength of light and a reference absorbance of light by the reference gas when a reference gas is irradiated with light is determined in advance. The gas analyzer includes an acquisition unit that acquires a target relationship between a wavelength of light and a target absorbance of light by the target gas when a target gas of the same type as the reference gas is irradiated with light, and a calculation unit that calculates a concentration of the target gas based on the first reference relationship and the target relationship in a wavelength range determined according to the magnitude of the target absorbance acquired by the acquisition unit.

The invention relates to the technical field of light control, and discloses a light control method and device based on environment self-adaption and a storage medium, and the method comprises the steps: obtaining a color temperature value of a light source, a chromatic value of the light source, environment brightness, a sampling moment and original light brightness; performing luminosity calculation according to the color temperature value, the chromatic value and the ambient brightness to obtain light intensity; carrying out brightness difference calculation according to the environment brightness and the sampling time to obtain a brightness change difference value; performing difference index calculation according to the brightness change difference value to obtain a brightness difference index value; performing intensity judgment according to the light intensity and the brightness difference index value to obtain an environment change degree value; according to the brightness change difference value and the environment change degree value, carrying out comfort calculation to obtain a light comfort value; and performing brightness comparison according to the original light brightness and the light comfort value to obtain an optimal light brightness adjustment value, and adjusting the light brightness according to the optimal light brightness adjustment value. The method can adjust the light state in time according to the change of the environment.

The invention discloses a method and a system for predicting luminosity of a low-earth-orbit satellite during transit, and the method comprises the steps: obtaining historical observation data, and constructing a comprehensive parameter data set of luminosity, position and related observation information of the low-earth-orbit satellite at different observation moments; equivalently representing the optical scattering sectional area of the low-orbit satellite by using the sectional area of the sphere generating the same brightness; key factors influencing the equivalent sectional area are determined; integrating the obtained parameterized relationship of the equivalent sectional area into a ball model formula to obtain a luminosity prediction model; taking the obtained comprehensive parameter data set as the input of the luminosity prediction model, and optimizing the luminosity prediction model through a data driving method to obtain an optimized luminosity prediction model; and substituting to-be-predicted low-earth-orbit satellite data into the optimized luminosity prediction model to obtain a luminosity prediction value of the low-earth-orbit satellite in the transit period. According to the method, the correction ball model is fitted through observation data, the luminosity prediction model is constructed in combination with key parameters, and the brightness of the low-orbit satellite is accurately predicted.

The invention relates to a near space low earth orbit satellite and satellite constellation luminosity spectral measurement method, which comprises the following steps: acquiring a low earth orbit satellite and satellite constellation model, and carrying out two-dimensional surface element grid division on the low earth orbit satellite and satellite constellation model; reconstructing a low earth orbit satellite and a satellite constellation model by using the divided surface element data, establishing different satellite and satellite constellation model scenes, and obtaining vector data of the satellite and the satellite constellation changing along with the solar altitude angle and the solar azimuth angle; and calculating the luminosity spectrums of satellites and satellite constellations in different observation scenes according to the vector data in combination with a bidirectional reflection distribution function model and an atmospheric radiation transmission model. The invention aims to improve the precision and stability of observation data, and compared with a space-based observation platform, the deployment and recovery cost of the near space observation platform is lower, and the observation position and angle are easier to adjust. The limitation of foundation observation and space-based observation is overcome, the observation precision and flexibility are improved, and an important means of diversified research is supported.

The invention discloses a multi-view camera splicing monitoring system based on a sky target, and relates to the technical field of visual intelligence. The multi-view camera splicing monitoring system based on the sky target comprises the following steps: a multi-view data acquisition module used for acquiring multiple types of data sets and carrying out time alignment and dimensionless normalization; the target detection and luminosity reference construction module is used for carrying out sky target detection and standard color block analysis and constructing a multi-view luminosity reference library; the deviation estimation and mapping construction module is used for constructing a cross-camera global luminosity mapping model; the adaptive control and real-time correction module is used for regional luminosity correction and illumination change detection; and the panoramic stitching and evaluation feedback module is used for constructing a joint area luminosity consistency evaluation index. According to the method, the multi-view splicing brightness color consistency and the target detection robustness under complex illumination are effectively improved, and the problems of seam brightness gradient and difficult color cast elimination caused by independent automatic exposure and white balance are solved.

The invention discloses a spatial point target luminosity space-based quantitative measurement method and a spatial point target luminosity space-based quantitative measurement device, which solve the problem of how to improve the efficiency and the precision of spatial point target luminosity space-based quantitative measurement. Belongs to the photoelectric detection field. Comprising the following steps: performing non-uniform correction and bilateral filtering denoising on an original image to obtain a preprocessed image; estimating a dark field value of the preprocessed image as a background gray value by adopting a mode method; if a point target is detected in the preprocessed image, performing photometric aperture calculation to obtain a photometric aperture when the optical signal-to-noise ratio is maximum, otherwise, directly feeding back invalid information; inputting a photometric aperture parameter into the calibration response relation function, and calculating an inversion photometric value of the point target; and according to the point target luminosity value error model or the point target luminosity value error transmission model, calculating a star magnitude error or a star magnitude standard deviation, and verifying the space point target luminosity space-based quantitative measurement precision. According to the invention, the spatial point target photometric measurement efficiency and precision are improved.

Lighting control systems and methods for providing dynamic control of multiple light sources with a single input are disclosed herein. When a long touch is detected at a user interface element, a first light source is turned on. If the long touch persists for a predefined time period, a second light source (e.g., an adjacent light source) is also turned on. The luminosity of the first light source may be gradually increased from zero to 100% during the predefined time period. If the long touch persists beyond the predefined time period, the luminosity of the second light source may be gradually increased from zero until the long touch ends or a second longer predefined time period is reached.

The invention discloses a space-time multi-parameter cooperative computing method and system based on a universe model, and relates to the technical field of universe and celestial body physics computing. According to the method, an integral kernel function is constructed based on an FLRW degree gauge of a standard universe model, redshift and universe densitology parameters input by a user are received, a Friedemann equation is calculated by using a Gauss-Kronrod adaptive numerical integration algorithm, basic quantities such as co-movement distance and time are solved, and the cosmic movement is realized. And deriving derivative parameters such as co-dynamic volume, angular diameter distance, luminosity distance, universe age, light running time and the like according to universe curvature types (flatness, opening and closing). The system comprises a parameter input module, a core integral calculation engine, a geometric model judgment module, a multi-type distance and derivative parameter calculation module and a result output module. According to the method, the problems of low calculation precision and poor model adaptability in the prior art are solved, a high-precision (error is less than or equal to 10 <-7 >) self-adaptive universe calculation solution with comprehensive parameter coverage is provided, and a powerful calculation tool is provided for universe research and astronomical observation data analysis.

The invention discloses an astronomical experimental device for simulating the photometric change of double food stars, and the device comprises a fixing unit which comprises a supporting part located at the lower part, an angle display part disposed at the top end of the supporting part, and a length display part transversely disposed on the angle display part. The limiting component is arranged on the angle display component, and the angle display component and the length display component are connected in series through the limiting component; the limiting unit comprises a fixing part located on the length display part and an adjusting part arranged below the fixing part. The invention provides a device capable of meeting more use requirements, improving the use efficiency of the device, facilitating the smooth proceeding of experimental work, and providing a device capable of recording the luminosity change and simulating the luminosity change conditions of different stages of a food double-star experiment by controlling the movement and the shielding degree of a star, so that the experimental efficiency of the food double-star experiment is improved. And thus, a scientific research scheme in the aspect of eating double stars in astronomy can be better assisted for working personnel.

Focusing aid (300) for setting up an optical system (106), comprising the focusing aid (300): a light module (310) comprising a light-emitting layer (312); and a mask structure (320) which is arranged on the light-emitting layer (312), wherein the mask structure (320) has an opaque layer (322) with a plurality of recesses (322a) and is arranged such that a plurality of sections (312a) of the light-emitting layer (312) are exposed and light can be emitted through the plurality of recesses (322a), and that one or more sections (312b) of the light-emitting layer (312) are covered and can form an optical contrast to the plurality of exposed sections (312a) of the light-emitting layer (312) to form a self-illuminating optical contrast pattern (300m), wherein the light module (310) comprises one or more organic light-emitting diodes or wherein the light module (310) is an organic light-emitting diode module, and wherein the opaque layer (322) has a layer thickness of less than 1 mm.

This invention discloses a method and system for space target detection and self-calibration photometry in spaceborne star field imaging. The method includes the following steps: acquiring the raw telemetry data stream from the satellite in spaceborne star field imaging mode, and reconstructing a two-dimensional raw image sequence; performing self-calibration radiometric correction, background noise modeling, multi-frame registration, source parameter extraction, and space target discrimination on the raw image sequence to obtain the corresponding stellar background, space targets, and single-frame artifacts; constructing a standard star candidate set and fitting a mapping model from standard star pixel coordinates to celestial coordinates; converting the pixel coordinates of the space target to the corresponding celestial coordinates; performing photometric zero-point fitting and space target photometry operations; and outputting structured space target observation results. This invention relates to the field of space target observation technology. By introducing multi-frame self-calibration radiometric correction, inter-frame geometric registration and multi-frame consistency discrimination, and robust photometric zero-point fitting, reliable observation of spaceborne space targets is achieved.

The invention provides a luminosity curve anomaly detection method based on a long and short term memory network, and relates to the technical field of space target intelligent perception. In view of the problems of dependence on labeled data, noise sensitivity, insufficient local anomaly capture capability and the like in the prior art, high-precision anomaly recognition is realized by constructing an unsupervised learning framework. According to the method, the time sequence dependency relationship is modeled through the long and short term memory network, and the time attention mechanism is introduced to dynamically focus the key time step, so that the anomaly detection precision of the model is improved. The invention provides an efficient solution for sensing the abnormal movement of the space target, and is suitable for real-time monitoring of complex scenes such as a geosynchronous orbit and earth-moon space.

Method for operating a luminaire (10) by means of gesture control without contact, which is equipped with - a luminaire (10) comprising at least one light source (14) which emits a beam of light (26) along an optical light emission axis (28), - a sensor arrangement (18) for detecting (i) a movement of an object (20) into and / or out of the light beam (26) and / or within the light beam (26) and (ii) a standstill of an object (20) in the light beam (26), wherein the object (20) is in particular a hand, and - an evaluation and control unit (22) which receives signals from the sensor arrangement (18) representing a movement of the object (20) as well as a standstill of the object (20) and evaluates these to detect a movement or standstill of the object (20) and which controls the at least one light source, - wherein the luminaire, when switched on, is switchable into at least one setting mode for setting or changing at least one photometric operating parameter of the luminaire (10), such as the brightness of the light, the color of the light, the color saturation of the light, the degree of spread of the light beam and / or the orientation of the light beam (26) in space, wherein the method - by moving the object (20) into and / or out of the light beam (26) and / or through the light beam (26) switching between an off state and an on state of the luminaire (10), - by the object (20) coming to a standstill within the light beam (26) while the light (10) is switched on, the light (10) is switched from deactivation of at least one setting mode or of one of several setting modes to its activation, - wherein the activation and / or deactivation of the at least one setting mode or one of the several setting modes is visually indicated by the evaluation and control unit (22) controlling the at least one light source (14) to intermittently change at least one photometric operating parameter of the luminaire (10) that can be set or adjusted in the activated setting mode, such as brightness flickering, in particular reversible color change, in particular reversible color saturation change, in particular reversible widening or narrowing of the light beam or reversible swiveling of the light beam (26), and - by moving the object (20) after it has come to a standstill, the lighting operating parameter(s) that can be set and / or changed in the activated setting mode is set or changed.

The application discloses a kind of space target luminosity dynamic measurement ground test system, the system includes: multiple degrees of freedom controllable rotary table, controllable rotary table is connected with satellite scale model, and controllable rotary table is used to drive satellite scale model multi-angle rotation adjustment;Visible light detection unit is located in the direction of satellite scale model reflected light path, it is used to image satellite scale model and generates continuous observation image sequence;Light source unit, it is used to simulate the parallel light source of sun, and light source is directly on satellite scale model;And general control unit.General control unit is used to control light source intensity, rotary table motion parameter and image acquisition, and image data is reduced sampling processing, generates the luminosity sequence of simulated long-distance observation.The technical scheme provided by the application can provide reliable technical support for space target identification, orbit prediction and stealth technology verification, with innovation, practicality and economy.

The invention provides a centimeter-level space debris threat approaching research and judgment method based on space-based optics. The method mainly comprises the following steps: 1, calculating the angular position and luminosity of a space target optical image; 2, determining the relative angle change rate of the space target; 3, calculating a threat angular rate threshold value and primarily judging threats; 4, distance change rate inversion and threat luminosity threshold calculation; and 5, studying and judging threat approaching. According to the method, an angular position and a luminosity value of a space target are extracted from an optical image, a high-precision angular rate is fitted, a threat of space debris is preliminarily judged, relative distance change is inversed in combination with luminosity, and a threat approaching condition is quickly judged. According to the method, relative kinematics and a classical radiation theory are utilized, the obtained angular rate is high in precision, a threat threshold result is reliable, and rapid threat approaching research and judgment of centimeter-level space debris in a space-based optical observation scene can be realized.

The application belongs to the field of target optical detection, and discloses a target optical detection simulation method and system containing a star background, which simulates a scene containing a star background and a target by constructing an optical scene to be detected, establishes a detection model, converts star luminosity and target luminosity optical physical quantities into gray value DN in the field of digital images, and presents data collected by a detector in the form of an image, accurately identifies and removes star information from a complex image containing stars and targets, accurately obtains the position of the target and the miss distance, determines the deviation of the target relative to an ideal observation position, adjusts the observation angle in real time, continuously tracks the target, ensures that the target is always in the center or within the field of view, and obtains comprehensive and accurate detection information, solving the problem that existing target detection process simulation has relatively independent elements, does not have the capability of simultaneously constructing a target and a background and full-link modeling simulation, and lacks physical simulation modeling capability.

The utility model relates to the technical field of UFO mining lamps, in particular to a self-adaptive light-changing UFO mining lamp which comprises a mining lamp body, a luminosity sensor, a connecting column, a mounting plate, a supporting mechanism, a light-transmitting protective shell and a cleaning mechanism, the connecting column is arranged on the upper surface of the mining lamp body, the mounting plate is arranged at the upper end of the connecting column, the self-adaptive light-changing UFO mining lamp is arranged on the lower surface of the connecting column, and the supporting mechanism is arranged on the lower surface of the supporting mechanism. According to the mining lamp, the functions of luminosity sensor supporting and position adjusting can be achieved, when the mining lamp is used, the luminosity sensor can comprehensively monitor the brightness of the surrounding environment of the mining lamp body, then the monitoring effect of the luminosity sensor is guaranteed, and the function of automatically cleaning dust particles on the surface of the light-transmitting protective shell can be achieved; the situation that dust particles are attached to the surface of the light-transmitting protective shell to affect the light-transmitting effect of the light-transmitting protective shell is effectively avoided, and the monitoring effect of the luminosity sensor is further guaranteed.

The invention belongs to the technical field of optical measurement and computer vision, and particularly relates to a photometric three-dimensional deformation monitoring method oriented to a natural light source condition. The method comprises the steps that targets are designed, and a target array is arranged according to the imaging range of a camera and the morphology characteristics of an observation object; measuring three-dimensional coordinates of feature points of a target pattern, and calculating a normal vector of a target surface and internal and external orientation elements of an image; calculating multi-period light source directions and light source intensities based on the target three-dimensional coordinates, the normal and the internal and external orientation elements of the image; calculating a surface normal vector by using a luminosity stereoscopic model based on the multi-period light source direction and intensity; and realizing object surface continuous reconstruction based on the surface normal vector and the imaging geometric constraint. Compared with the traditional method, the method can break through the problem that the traditional photometric stereo depends on an artificial light source and is difficult to adapt to the dynamic change of a natural light source so that the method is not applicable, can realize deformation monitoring in an outdoor environment without the artificial light source, and has the advantages of low cost and wide coverage range.

The application discloses a relative photometry improvement method for an oversaturated detection image, belongs to the technical field of astronomical image photometry, and aims at solving the problem that the nonlinear truncation of the observed light flux is caused by the oversaturation of the gray value of a star in an existing astronomical image, and the systematic deviation exists in a classical relative photometry model in a star apparent magnitude estimation method. The method comprises the following steps: based on a point spread function model of saturation truncation, a mathematical relationship between the total light flux of a star and the observed light flux of the star in an astronomical oversaturated detection image is established; according to the mathematical relationship, a relative photometry improvement model is established; based on the observed light fluxes of a plurality of known stars and corresponding reference apparent magnitudes, an iterative optimization algorithm is adopted to iteratively optimize the relative photometry improvement model, and the optimal model parameter in the model is solved; and based on the optimal model parameter and the observed light flux of a target to be measured, the apparent magnitude estimation value of the target in the astronomical oversaturated detection image is obtained through the relative photometry improvement model.

The invention relates to different variants of reflectors (220), which alone or together with a light unit (210) also described form a space-saving high-luminosity system.

Disclosed in the present invention is a luminosity compensation method for testing optical performance of a lamp. The method includes: S1: acquiring reference test data Data1 from a standard-compliant lamp; S2: acquiring actual test data Data2 of a lamp under test; S3: fitting and aligning the reference test data Data1 and the actual test data Data2 to acquire a preliminary data position in the reference test data Data1 that best matches the actual test data Data2; S4: performing position compensation on the preliminary data position to acquire a final data position; and S5: determining a final luminosity value of the lamp under test according to the final data position. The present invention can shorten the test time to improve the production line test efficiency and meet production requirements, and can also reduce the impact of heat accumulation on the test result to improve the accuracy of the test result.

The invention discloses a high-precision space target orbit forecasting method based on numerical fitting, and relates to the technical field of space target orbit forecasting, frequency domain decomposition is combined with a harmonic compensation model, and seasonal system drift caused by sun-moon gravity is thoroughly eliminated; high-frequency components peel off attitude noise through light pressure parameterization and smooth difference, and perturbation coupling error transmission is avoided; a harmonic order adaptive mechanism captures a main disturbance term with the minimum calculation amount; carrying out least square batch estimation to realize coefficient primary solution; the template library pre-loading technology effectively compresses the time consumed for new target initialization; in addition, a geomagnetic modulation factor is introduced to dynamically suppress compensation distortion during a magnetic storm period, a sliding window mechanism guarantees real-time updating of a coefficient, and stable forecasting is still maintained under an extreme event; attitude measurement is replaced by luminosity curve inversion, so that non-cooperative target forecasting becomes possible; tangential component directional compensation ensures the stability of an orbital plane, and reduces the fuel consumption of satellite position protection.

To meet a request that one gas analyzer preferably be capable of covering a wide measurement range.SOLUTION: A first reference relationship between the wavelength of light emitted to a reference gas and a reference absorbance of the light by the reference gas is defined in advance. A gas analyzer includes: an acquisition unit that acquires a target relationship between the wavelength of light emitted to a target gas that is of the same type as the reference gas and a target absorbance of the light by the target gas; and a calculation unit that calculates the concentration of the target gas based on the first reference relationship and the target relationship in a wavelength range defined according to the magnitude of the target absorbance acquired by the acquisition unit.SELECTED DRAWING: Figure 4

A detection method for a gravitational wave electromagnetic counterpart based on an optical telescope system relates to the field of optical telescope detection technology, solves the problem that the existing optical telescope cannot simultaneously measure the luminosity and spectrum of a celestial body, resulting in limited use of the optical telescope, obtains the spot signal of each celestial body in the sky area through two visual observation optical telescopes, and the spot signal is received by a CCD detector to obtain an imaging image; uses astronomical positioning software to determine the position of the transient source celestial body target; and performs photometric analysis to obtain the photometric value of the transient source celestial body target; the common-view optical telescope obtains the transient source celestial body target and performs spectral measurement on it through a multi-channel spectrometer; the photometric value and spectral data of the transient source celestial body target are simultaneously transmitted to a PC terminal to obtain the distance and mass of the gravitational wave electromagnetic counterpart. The present invention simultaneously measures the luminosity and spectrum of a celestial body, more conclusively determines the gravitational wave electromagnetic counterpart, and increases the determination confidence of the existing equipment.

Lighting control systems and methods for providing dynamic control of multiple light sources with a single input are disclosed herein. When a long touch is detected at a user interface element, a first light source is turned on. If the long touch persists for a predefined time period, a second light source (e.g., an adjacent light source) is also turned on. The luminosity of the first light source may be gradually increased from zero to 100% during the predefined time period. If the long touch persists beyond the predefined time period, the luminosity of the second light source may be gradually increased from zero until the long touch ends or a second longer predefined time period is reached.

The application discloses a high-precision space target orbit prediction method based on numerical fitting, and relates to the technical field of space target orbit prediction.The frequency domain decomposition of the application is combined with a harmonic compensation model to completely eliminate seasonal system drift caused by the gravitation of the sun and the moon; high-frequency components are stripped of attitude noise through light pressure parameterization and smooth difference to avoid the transmission of perturbation coupling error; a harmonic order adaptive mechanism captures the main disturbance term with the least amount of calculation; least square batch estimation realizes one-time solution of coefficients; template library preloading technology effectively compresses the time consumption of new target initialization; in addition, the application introduces a geomagnetic modulation factor to dynamically suppress compensation distortion during magnetic storms, and a sliding window mechanism guarantees real-time updating of coefficients, and stable prediction is still maintained under extreme events; photometric curve inversion is adopted instead of attitude measurement to make non-cooperative target prediction possible; tangential component directional compensation ensures the stability of the orbit plane and reduces satellite position fuel consumption.

Even a small change in the distance between the lens and the light source in the direction of light irradiation can alter the illumination range. [Solution] The light-emitting device 1 comprises a light-emitting element 10 that emits light from a light-emitting surface 11, and a lens 20 having an incident surface 21 into which the light emitted from the light-emitting element is incident and an outgoing surface 22 that emits light. The lens is movable a predetermined distance D relative to the light-emitting element in the direction of the center of luminosity of the light-emitting surface. The incident surface has a first region 211 formed on a substantially flat surface facing the center of luminosity, and a second region 212 provided around the first region where a plurality of reflective prisms 213 are formed. The ratio of the maximum width W2 of the first region to the maximum width W1 of the light-emitting surface is a predetermined ratio including equality.

The present invention discloses a low-illuminance calibration device and a test method for spatial point targets, which solves the problem of how to improve the photometric detection ability of spatial optoelectronic devices for spatial low-illuminance point targets; it belongs to the field of optoelectronic detection; it includes: removing background noise data, selecting a star point target board and a light attenuation sheet to simulate the actual measurement state of spatial low-illuminance point targets; using the annular region method to estimate the gray value of the point target, and fitting the calibration coefficient with the true calibration beam illuminance value to obtain a point target calibration model; adjusting the illuminance of the light source and replacing the star point target board, and inversely calculating the theoretical calibration beam illuminance value through the point target calibration model to obtain a stable calibration coefficient and optimize the point target calibration model, obtaining the photometric measurement deviation of point targets with different photometric magnitudes and imaging sizes, and verifying the low-illuminance calibration test accuracy of spatial point targets; the present invention reduces measurement errors and obtains high-precision calibration coefficients and reliable photometric quantitative measurement capabilities.