33 results about "Reflectance factor" patented technology

The present application relates to the technical field of inventory management, in particular to a stone surface intelligent warehouse management method based on machine vision, comprising the following steps: multi-modal sensor acquisition stone image temperature distance data, gray quantization and time difference feature set generation, synchronous calibration, Kalman filter fusion and dynamic weight adjustment, output positioning result and analysis of reflectance coefficient adjustment light source, optimization of light field parameter collection texture reconstruction three-dimensional model and error correction update, based on model extraction position information correction inventory strategy generates inventory management scheme, in the present application, through multi-source sensor cooperative acquisition fusion, positioning consistency is kept, error diffusion is avoided, illumination monitoring and reflection adjustment optimize light field, ensure stone texture complete and stable, three-dimensional model dynamic reconstruction and correction real-time update feature synchronous storage state, improve stacking level and goods location recognition accuracy, enhance inventory information reliability and consistency.

The present invention relates to an optical lens comprising a substrate and a multi-layer antireflection coating provided on at least one of the main surfaces of the substrate and comprising a stack of at least one layer having a high refractive index and at least one layer having a low refractive index, a spectral reflectance curve of the multi-layer antireflection coating for an angle of incidence in the range of 0 DEG to 15 DEG has a reflection peak centered on a wavelength in the range of 435-450 nm and having a maximum reflectance of less than or equal to 30% and a full width at half maximum of less than or equal to 90 nm, and a local reflectance minimum in the range of 380-420 nm of less than or equal to 2% and a multi-layer antireflection coating for the at least one major surface, the multi-layer antireflection coating providing the at least one major surface with: for an angle of incidence in the range of 0 to 15 degrees, the present invention relates to a light-emitting device comprising a light-emitting element, a light-emitting element, an average light reflection factor Rv of 380 nm to 780 nm of less than or equal to 2.5%, an average blue light reflection factor RmB1 of greater than or equal to 15% in the wavelength range of 420 nm to 450 nm of greater than or equal to 15%, an average blue light reflection factor RmB3 of greater than or equal to 15% in the wavelength range of 440 nm to 460 nm of greater than or equal to 15%, and a ratio RmB1 / RmB3 of less than or equal to 1.

This invention provides a curvewave domain-based method for removing strong axes based on reflection coefficient attribute volumes, relating to the field of seismic data processing technology. The method includes: performing spectral inversion processing on raw seismic data to generate a reflection coefficient volume; based on the reflection coefficient volume, performing multi-scale, multi-directional layer-by-layer analysis in the curvewave domain, i.e., extracting reflection coefficient curves for each analysis window, determining inflection point locations by calculating the zero point of the second derivative of the curves to identify abrupt changes in the reflection coefficient; simultaneously, constructing local discrete surfaces based on the reflection coefficient volume, identifying local geometric anomaly regions of the reflection coefficient volume by fitting surface patches and calculating Gaussian curvature; and extracting strong reflection coefficient components by combining the determined inflection point locations and the identified local geometric anomaly regions. This invention can achieve precise stripping of strong reflection energy and faithful protection of effective weak signals, improving the reliability of seismic data in identifying and analyzing subsurface lithology and geological structures.

The application discloses a light source color resolution evaluation method, device and equipment and a storage medium, and relates to the technical field of light source quality testing. The spectral power distribution of a test light source is acquired under multiple exit angles, and the bidirectional reflectance factor of a test color sample is combined to calculate three stimulus values and white point three stimulus values. The hue angle, brightness value and saturation value of each test color sample under the exit angle are calculated according to the three stimulus values and the white point three stimulus values. The comprehensive color error value of the test light source relative to a reference light source under the exit angle is obtained according to the aforementioned three parameters. The color resolution index of the test light source is obtained according to the neutral density index of the test light source and the comprehensive color error value corresponding to each exit angle. The spectral power distribution is collected under multiple exit angles, the color rendering performance of the light source in the front is considered, and the spectral output difference under different angles is also considered, so that the color rendering consistency and the directional characteristics of the light source in the spatial distribution can be comprehensively reflected.

The application discloses a least square reverse-time migration imaging method, device, equipment and medium, and relates to the technical field of geophysical exploration.The application is characterized in that, in the process of capturing the second-order curvature information of a target function at a current iteration point based on the gradient of the target function in the current iteration of a reflection coefficient model, an adjustable weight parameter is used to perform convex combination on a quasi-Newton equation capable of matching the gradient to the target function value in iteration and a quasi-Newton equation directly using an adaptive weight parameter to adjust the reflection system model update amount in iteration, so that the second-order curvature information of the target function at the current iteration point can be captured more accurately at a higher convergence speed, the calculation efficiency is greatly improved by combining the adaptive weight parameter, and finally high-precision migration imaging is performed.

The application discloses a kind of effective Fennel reflection coefficient calculation method based on sea wave spectrometer, first by least square fitting anisotropic quasi-speculum scattering formula, the slope variance component of observation azimuth is obtained;The variation law of the slope variance component with azimuth is fitted with azimuth cosine function, to obtain the total slope variance of the detected sea surface, slope variance component fluctuation rate and sea surface wave propagation direction;Then by the slope variance component along the wave propagation direction and total slope variance, the distribution of the slope variance component perpendicular to the detection azimuth with observation azimuth is obtained;Finally, by calculating the non-standardized correlation coefficient between observation azimuth and the slope variance perpendicular to observation azimuth angle, the 0 degree effective Fennel reflection coefficient of different incident angle beams can be obtained according to quasi-speculum scattering formula, and the effective Fennel reflection coefficient of Ku band at 0 degree incident angle can be obtained by averaging the results of each beam with wind speed.

A method for determining oxygen saturation includes emitting light from sources into tissue; detecting the light by detectors subsequent to reflection; and generating reflectance data based on detecting the light. The method includes determining a first subset of simulated reflectance curves from a set of simulated reflectance curves stored in a tissue oximetry device for a coarse grid; and fitting the reflectance data points to the first subset of simulated reflectance curves to determine a closest fitting one of the simulated reflectance curves. The method includes determining a second subset of simulated reflectance curves for a fine grid based on the closest fitting one of the simulated reflectance curves; determining a peak of absorption and reflection coefficients from the fine grid; and determining an absorption and a reflectance coefficient for the reflectance data points by performing a weighted average of the absorption coefficients and reflection coefficients from the peak.

The application discloses a bidirectional reflectance factor calculation method for forest canopy high-resolution remote sensing images, and steps of the method comprise the following steps: 1) determining remote sensing images and corresponding canopy height model information, observation geometric parameters and sky scattering light proportion; collecting forest canopy structure parameters and forest spectrum parameters; 2) calculating a single scattering bidirectional reflectance factor BRF self_sgl only considering that a single scattering occurs inside a target pixel and a single scattering bidirectional reflectance factor BRF adj_sgl affected by adjacent pixels; 3) calculating a multiple scattering bidirectional reflectance factor BRF self_mul only considering that a multiple scattering occurs inside a target pixel and a multiple scattering bidirectional reflectance factor BRF adj_mul affected by adjacent pixels; 4) calculating a total bidirectional reflectance factor BRF self = BRF self_sgl + BRF self_mul , wherein the total bidirectional reflectance factor BRF adj = BRF adj_sgl + BRF adj_mul .

The present disclosure provides a reflective type optical scale for encoder including a disk-shaped metal substrate including a first surface, and a second surface facing the first surface, and a low reflection layer disposed on the first surface side of the metal substrate in a patterned shape along with a circumferential direction of the metal substrate, wherein the metal substrate has a reflection coefficient on at least the first surface side that is 50% or more, and a thickness of 0.05 mm or more and 0.60 mm or less; and the metal substrate includes a shear droop at an outer circumferential edge of the first surface side, and a width of the shear droop is 500 μm or less.

The invention relates to a VTI medium least square reverse time migration method and system suitable for an Adam gradient optimization algorithm, and belongs to the field of seismic migration imaging, and the method specifically comprises the following steps: carrying out the subtraction of conventional approximate longitudinal and transverse wave reflectivity models C33 and C55 with the background speed of the conventional approximate longitudinal and transverse wave reflectivity models C33 and C55, carrying out the division, carrying out the normalization processing, and constructing a real longitudinal and transverse wave reflection coefficient model. And linear forward modeling is carried out on the basis of a VTI medium first-order stress velocity elastic wave equation. And expressing the linearized forward modeling in a deep learning framework in an RNN convolution form to obtain a simulated seismic record of the linearized forward modeling. And making a difference between the simulated seismic record and the actual seismic record, and establishing a target function. And optimizing the gradient by using an Adam gradient optimization algorithm in deep learning, and updating the longitudinal and transverse wave reflection coefficient model by using the optimized gradient until the precision requirement is met. According to the method, the precision of gradient optimization is improved, the problem of extremely slow convergence is solved, and finally a more accurate least square reverse time migration result is obtained.

When an object with a high reflection surface is measured, due to the fact that the dynamic range of a camera is limited, a saturation phenomenon often occurs, and negative influences are caused on three-dimensional measurement. In order to effectively solve the problem, the invention provides a novel adaptive fringe projection method. Firstly, an intensity transfer model is established, a surface reflection coefficient is calculated by using a uniform gray level image, and the optimal projection intensity under a camera coordinate system is accurately determined. Then, calculating a smoothing absolute phase in a saturation region by adopting a low-intensity orthogonal stripe pattern, and establishing a coordinate mapping relation; and diffusing the mapping pixel intensity to a neighborhood region, and taking a minimum value in an overlapping region so as to generate an optimal projection intensity template under a projector coordinate system. And finally generating a self-adaptive stripe pattern based on the template. Experimental results show that the method can realize high-precision and high-integrity three-dimensional measurement on the object with the high reflection surface.

The invention discloses a satellite-borne GNSS-R soil humidity inversion method based on a Fresnel reflection coefficient, and belongs to the field of satellite-borne GNSS-R soil humidity remote sensing monitoring, and the method comprises the steps: obtaining satellite-borne GNSS-R observation data, and carrying out the preprocessing; eliminating satellite-borne GNSS-R observation data influenced by a water body by adopting a water body elimination method; fitting to obtain a Fresnel reflection coefficient correction function based on different satellite signal incidence angles and environmental parameters; correcting the original surface reflectance by using the Fresnel reflection coefficient correction function to obtain the corrected surface reflectance; and establishing a linear inversion equation based on the corrected surface reflectance and soil humidity reference product data to realize soil humidity inversion. According to the method, water body interference is effectively eliminated, the influence of multiple factors on the Fresnel reflection coefficient is weakened, the soil humidity inversion precision and stability are improved, the sampling point number advantage is remarkable, and reliable technical support is provided for dynamic monitoring of the soil humidity.

The present application is suitable for oil and gas geophysical exploration technical field, provide a kind of stratum attenuation factor time-frequency domain prestack seismic inversion method and system, the method includes the following steps: construct about longitudinal, transverse wave attenuation factor frequency domain AVO formula, propose the collaborative inversion strategy of joint time-frequency domain seismic data real part and imaginary part information;Input partial stack seismic data and carry out spectral decomposition, obtain time-frequency domain seismic data;According to the real part of time-frequency domain data, the frequency variable longitudinal, transverse wave modulus reflectivity is calculated;According to the imaginary part of time-frequency domain data, construct the time-frequency spectrum of imaginary part reflectivity difference;With the real part inversion result as prior information, in combination with the spectrum of seismic wavelet, the frequency variable longitudinal, transverse wave attenuation factor frequency gradient attribute is inverted, and the longitudinal, transverse wave attenuation factor is calculated by frequency integration.This method uses the real part and imaginary part information of time-frequency domain seismic data, and provides an effective method for calculating stratum attenuation factor by "real part-imaginary part" hierarchical inversion strategy.

The invention relates to a secured document (100) comprising: a substrate (101) partially covered in at least two, preferably non-overlapping regions with an additional layer, wherein a first effect layer (104) made of a material susceptible to deformation under the influence of an external pressure force and reflecting light, having a high light reflectance coefficient, is applied to at least a first substrate region (106), and a second print layer (103) made of a reflective, color, high-viscosity coating material, which modifies the substrate (101), is applied to at least a second substrate region (107); and wherein on at least the first region (106) of the substrate there is a first security element (102) which is an embossed optical element (108) comprising an embossed structure made by the gravure method in the form of a grid (400) of cells (401), preferably equilateral cells, most preferably square cells, wherein a single cell (401) corresponds to a single point of the first security element (102) forming, together with the remaining points of the grid, a globally perceptible, information-bearing first security element (102), and in which cells (401) there are sub-images (403) formed by convex embossed lines (402) parallel to the remaining ones present in the cell, having a predetermined height (h) in relation to the surface of the substrate (101) between the lines (402), modified with a material susceptible to deformation under the influence of an external pressure force and reflecting light, having a high light reflectance coefficient, which lines (402) in each of the cells (401) of the grid (400) are parallel to each other, and the angle of inclination of the lines relative to the selected axis of symmetry, identical for all cells, of the first security element (102) defined in the plane of the substrate (101) is constant within each of the cells (401) of the grid (400) and varies within the range from 1 to 180°, and the number of lines (402) in each of the cells (401) of the grid (400) is equal to or greater than three and the maximum distance measured between the most distant points of each of the cells (401) does not exceed 1 mm, preferably is less than 0.7 mm, more preferably is less than 0.5 mm and most preferably is less than 0.1 mm.

To improve restoration quality of three dimensional information of a side scan sonar image, and to improve accuracy of three dimensional reconfiguration of the side scan sonar image.SOLUTION: The three dimensional reconstruction method for side-scan sonar images of the present invention comprises: reading side-scan sonar images to be three dimensionally reconstructed; designing a shape recovery method (SFS) mixture reflection model for side-scan sonar images, including designing an adaptive specular reflection coefficient, designing an adaptive diffuse reflection coefficient, designing an adaptive specular reflection index, and designing a seabed surface adaptive mixture reflection model formula; obtaining three dimensionally reconstructed surface elevations, including inversely transforming seabed surface elevation values and designing an inversely transformed elevation limiting factor; and outputting a three dimensional reconstruction result of the side-scan sonar images. To provide high-quality underwater three dimensional topographical information by application scenes such as AUV underwater high-precision navigation, underwater rescue, and submarine exploration.SELECTED DRAWING: Figure 1

The invention discloses a method and system for testing and analyzing magneto-optical parameters of a magnetic multilayer film, and belongs to the technical field of photoelectron data analysis, and the method comprises the following steps: carrying out an ellipsometry test on a to-be-tested magnetic multilayer film sample to obtain ellipsometry parameters of the sample; constructing an optical model according to the structure of the magnetic multilayer film sample to be tested, and performing fitting calculation by combining an optical theory and the ellipsometric parameters obtained by testing to obtain optical property parameters of each layer of film in the sample; the method comprises the following steps: carrying out a magneto-optical ellipsometry test on a to-be-tested magnetic multilayer film sample to obtain a reflection coefficient of the sample in an unmagnetized state and a magneto-reflection coefficient caused by a Kerr effect, deriving a total propagation matrix of light in the magnetic multilayer film sample, and calculating to obtain a Jones matrix of the sample; and calculating the magneto-optical coupling coefficient of each layer of film according to the Jones matrix, the reflection coefficient, the magneto-reflection coefficient and the optical property parameter of each layer of film. According to the invention, accurate characterization of magneto-optical parameters of magnetic multilayer films with various thicknesses, various materials and various layer numbers can be realized.

The application discloses a kind of seismic data processing method, device, equipment and storage medium, belong to the technical field of seismic exploration.The method is by Fourier transform to first seismic data and seismic wavelet, respectively obtain first spectrum and second spectrum, then based on first spectrum and second spectrum, determine the reflectivity data volume, convert the reflectivity data volume into lithology wave impedance body, again lithology replaces lithology wave impedance body, obtain igneous rock wave impedance body, convert igneous rock wave impedance body into igneous rock reflection signal data, finally, igneous rock reflection signal data is separated from first seismic data.It can be seen from this, the method only removes igneous rock strong reflection signal from seismic data, retains reservoir effective signal, so that reservoir prediction can be carried out based on reservoir effective signal, to improve the accuracy of reservoir prediction.

The invention relates to a secured document (100) comprising: a substrate (101) partially covered in at least two, preferably non-overlapping regions with an additional layer, wherein a first effect layer (104) made of a material susceptible to deformation under the influence of an external pressure force and reflecting light, having a high light reflectance coefficient, is applied to at least a first substrate region (106), and a second print layer (103) made of a reflective, color, high-viscosity coating material, which modifies the substrate (101), is applied to at least a second substrate region (107); and wherein on at least the first region (106) of the substrate there is a first security element (102) which is an embossed optical element (108) comprising an embossed structure made by the gravure method in the form of a grid (400) of cells (401), preferably equilateral cells, most preferably square cells, wherein a single cell (401) corresponds to a single point of the first security element (102) forming, together with the remaining points of the grid, a globally perceptible, information-bearing first security element (102), and in which cells (401) there are sub-images (403) formed by convex embossed lines (402) parallel to the remaining ones present in the cell, having a predetermined height (h) in relation to the surface of the substrate (101) between the lines (402), modified with a material susceptible to deformation under the influence of an external pressure force and reflecting light, having a high light reflectance coefficient, which lines (402) in each of the cells (401) of the grid (400) are parallel to each other, and the angle of inclination of the lines relative to the selected axis of symmetry, identical for all cells, of the first security element (102) defined in the plane of the substrate (101) is constant within each of the cells (401) of the grid (400) and varies within the range from 1 to 180°, and the number of lines (402) in each of the cells (401) of the grid (400) is equal to or greater than three and the maximum distance measured between the most distant points of each of the cells (401) does not exceed 1 mm, preferably is less than 0.7 mm, more preferably is less than 0.5 mm and most preferably is less than 0.1 mm.

The application provides an image gray estimation method and system, computer equipment and a storage medium, and belongs to the field of image processing, and comprises the following steps: projecting light stripes to a plane where a calibration plate is located, and calibrating plane equations of the light stripes; projecting multiple structure lights to a surface of a measured tubular object, collecting reflected light of the measured tubular object, and extracting light stripe centers; calibrating relative values of surface reflection coefficients of the measured tubular object plane, and obtaining multiple surface reflection coefficient values of the surface of the measured tubular object; taking mean values of the multiple reflection coefficients, and calculating a theoretical gray value of the surface of the measured tubular object according to the mean values of the multiple reflection coefficients. The application can accurately estimate the gray distribution of the surface of the object under specific illumination conditions by using optical simulation, better simulates and optimizes influences of illumination, reflection and other factors on image gray, provides more reliable data support for defect detection of the tubular object, and improves the precision and robustness of the structure light three-dimensional scanning.

The invention is suitable for the technical field of oil and gas geophysical exploration, and provides a time-frequency domain prestack seismic inversion method and system of a stratum attenuation factor, and the method comprises the following steps: constructing a frequency domain AVO formula related to longitudinal and transverse wave attenuation factors, and proposing a collaborative inversion strategy combining real part and imaginary part information of time-frequency domain seismic data; inputting the partially superposed seismic data and performing spectral decomposition to obtain time-frequency domain seismic data; according to the real part of the time-frequency domain data, calculating frequency-varying longitudinal and transverse wave modulus reflectivity; constructing a time-frequency spectrum of an imaginary part reflection coefficient difference according to the imaginary part of the time-frequency domain data; a real part inversion result is used as prior information, and longitudinal and transverse wave attenuation factors are calculated through frequency integration in combination with the frequency spectrum of seismic wavelets and the frequency gradient attributes of the longitudinal and transverse wave attenuation factors of frequency variation. According to the method, real part and imaginary part information of time-frequency domain seismic data is utilized, and an effective method is provided for calculating the stratum attenuation factor through a real part-imaginary part hierarchical inversion strategy.

The invention discloses a stratum reflection coefficient inversion method and system based on spectral bluing, and belongs to the technical field of oil exploration seismic data processing. The method comprises the following steps: firstly, counting blue spectrum characteristics of logging reflection coefficients through spectrum analysis, extracting anti-blue factors according to the blue spectrum characteristics, and constructing an anti-blue factor matrix; introducing the matrix into a sparse inversion framework, and establishing a spectral bluing reflection coefficient inversion equation; and finally, solving an expression of a reflection coefficient by optimizing the inversion equation, and solving the expression of the reflection coefficient by adopting a repeated weighted iterative algorithm to obtain a high-resolution stratum reflection coefficient with a blue spectrum characteristic. The method breaks through the hypothesis that the reflection coefficient is white noise in the traditional method, enables the inversion result to better conform to the physical reality of the stratum, and remarkably improves the thin layer recognition capability and the reservoir interpretation precision. The corresponding system comprises a frequency spectrum characteristic statistics module, an anti-blue matrix construction module, an inversion equation construction module, a solution module and the like, and automatic operation of the process is achieved.

This invention discloses a distributed reflective system, a control method, and a computer-readable storage medium. The distributed reflective system includes: at least two reflectors disposed within a reflective area between two adjacent photovoltaic module arrays; and a control module connected to a transmission module, configured to select a target area within the reflective area based on irradiance data and reflectance coefficients corresponding to various positions within the reflective area, determine the number of reflectors within the target area, and generate a transmission command for the reflectors, wherein the reflection gain at the target position within the target area is greater than the reflection gain at other positions within the reflective area; and a transmission module, configured to transmit the specified number of reflectors to the target position within the target area upon receiving the transmission command. The technical solution of this application enables effective utilization of solar irradiance between photovoltaic modules.

A method for reproducing at least one reflection of a reverberation in a virtual acoustic rendering system, the method comprising: for a room, obtaining a geometry of the room and at least one spatial room impulse response, where the at least one spatial room impulse response is obtained based on measurements in the room; determining a reverberation time parameter based on the at least one space room impulse response; determining a room absorption area based on the determined reverberation time parameter and the geometric structure of the room; determining at least one parameter of an early reflection from the at least one spatial room impulse response based on at least one image source location, where the at least one image source location is associated with the early reflection of the at least one spatial room impulse response; extracting at least one reflection from the at least one spatial room impulse response; for at least one surface of the room, extracting at least one reflection coefficient based on the extracted at least one reflection; assigning an absorption coefficient to at least one surface of the room based on the at least one reflection coefficient and the determined room absorption area; and rendering at least one early reflection based on the determined absorption coefficient.

The application belongs to the technical field of heat reflection, and discloses a method and system for testing heat reflection coefficient. The application utilizes a high-precision cold and hot stage to accurately control the surface temperature of a test sample, obtains incident light information and reflected light information based on two detectors, and calculates the heat reflection coefficient of the test sample in a test temperature range in combination with temperature data. The application can measure a heat reflection coefficient with higher accuracy, and the system for testing heat reflection coefficient has simple structure, low cost, convenient operation, high working stability and strong practicability.

The present application belongs to the technical field of quantitative remote sensing, and relates to a kind of middle infrared hyperspectral emission and reflection characteristic integrated retrieval method, comprising: obtaining middle infrared hyperspectral satellite remote sensing data, and optimizing processing is carried out to the sensing entrance pupil radiance data, to obtain optimized entrance pupil radiance data;Middle infrared hyperspectral satellite remote sensing data includes sensing entrance pupil radiance data;Optimized entrance pupil radiance data is carried out atmospheric correction using radiation transfer model, obtains ground surface brightness temperature and atmospheric downlink radiation, and calculates solar irradiance reaching ground surface;Middle infrared hyperspectral ground surface bidirectional reflectance factor retrieval framework is constructed, and ground surface bidirectional reflectance factor retrieval is carried out based on middle infrared hyperspectral ground surface bidirectional reflectance factor retrieval framework, to obtain ground surface bidirectional reflectance factor and ground surface equivalent radiance;Scene adaptive framework is constructed, and ground surface temperature and ground surface emissivity are retrieved based on scene adaptive framework;To complete the accurate separation of ground surface emission radiation and reflection radiation.

The present application relates to the technical field of meteorological identification, more particularly, to a differential reflectivity factor column identification method, system, medium and equipment. The scheme comprises importing radar-based data, performing quality control, and generating basic radar data; performing three-dimensional grid point processing according to the basic radar data to generate non-uniform grid point data; performing Cartesian coordinate conversion according to the non-uniform grid point data to generate three-dimensional grid point data; performing Zdr section identification according to the three-dimensional grid point data to generate Zdr section characteristic quantities, performing two-dimensional component identification to generate Zdr two-dimensional components; and performing Zdr column synthesis at different altitudes starting from the zero-degree layer height according to the Zdr two-dimensional components, and generating the maximum value of Zdr in real time. The scheme is a differential reflectivity factor column identification method based on dual-polarization weather radar observation data, which realizes quantitative analysis of severe convective storms and provides a powerful means for monitoring and early warning of severe convective storms.

This invention relates to the field of optical detection, specifically to a universal method and device for detecting the focal length of a human eye based on the ciliary body. The method includes: obtaining the focal length of a sample group at different standard focal lengths f1 to f2. m The OCT light signal set of the ciliary body region was collected, and each different site M1 to M2 was extracted from the OCT light signal set. n Points P1 to P2 in different layers i The sample light reflectance coefficients, after normalization transformation, are used to obtain different standard focal lengths f1 to f2. m The invention obtains the "feature point-sample mean light reflectance coefficient curve" and the "feature point-measured light reflectance coefficient curve" for any focal length of the subject, and fits it with the "feature point-sample mean light reflectance coefficient curve" to obtain the measured focal length value of the subject. This invention achieves universal detection of the human eye's actual focal length based on the ciliary body, avoiding eye discomfort caused by laser irradiation of the lens, allowing the subject to enjoy a better testing experience with less eye stimulation, and further making focal length detection more accurate.

The invention relates to the technical field of seismic imaging, and discloses a seismic inversion imaging method, system and device and a medium, and the method comprises the steps: obtaining observation seismic data, background medium speed and a first reflection coefficient; obtaining first simulated seismic data based on the first reflection coefficient and the background medium speed; determining an update gradient based on the first reflection coefficient, the observed seismic data and the first simulated seismic data; inputting the updated gradient into a trained preset model, and outputting a search direction; obtaining a second reflection coefficient based on the search direction and the first reflection coefficient; and taking the second reflection coefficient as a new first reflection coefficient, repeating the above steps to iteratively update the second reflection coefficient until a preset condition is met, and taking the target reflection coefficient meeting the preset condition as a target seismic imaging result. According to the method, the Hessian precondition operator is not directly calculated, so that the calculation complexity is effectively reduced, and a clear seismic imaging result is obtained.

The invention discloses a least square reverse time migration imaging method and device, equipment and a medium, and relates to the technical field of geophysical exploration. In the process of capturing the second-order curvature information of an objective function at a current iteration point based on the gradient of the objective function in the current iteration of a reflection coefficient model, the second-order curvature information of the objective function at the current iteration point is obtained through adjustable weight parameters; according to the method, a quasi-Newton equation capable of matching a gradient with an objective function value in iteration and a quasi-Newton equation capable of directly adjusting the updating quantity of a reflection system model by using a ratio parameter in iteration are subjected to convex combination, and the gradient can be used for matching the objective function value in iteration in the process; according to the method, the updating amount of the reflection system model is adjusted by directly utilizing the self-adaptive ratio adjustment parameter, and the addition combination in the process is weight self-adaptive combination, so that the second-order curvature information of the target function at the current iteration point can be more accurately captured at a higher convergence speed, and the calculation efficiency is greatly improved by combining the self-adaptive ratio adjustment parameter; and finally, high-precision migration imaging is carried out.

The application belongs to the technical field of thermal reflectance coefficient measurement, and discloses a micro-region thermal reflectance coefficient in-situ calibration method and system. The application obtains an offline calibration curve corresponding to a micro-region of a target device, and the offline calibration curve is a function relationship between a temperature-sensitive electrical parameter and a junction temperature; in-situ synchronous measurement is performed on the target device to obtain in-situ measurement information corresponding to the micro-region; the in-situ measurement information includes optical reflectivity signals and temperature-sensitive electrical parameter signals corresponding to at least two different stable temperatures of the micro-region; and the thermal reflectance coefficient of the micro-region is calculated by combining the in-situ measurement information and the offline calibration curve. The application can realize in-situ calibration of the thermal reflectance coefficient in the micro-region.