26results about How to "Improving Imaging Accuracy" patented technology

The application discloses a kind of acoustic-electric tomography image imaging algorithm based on two-point gradient iterative method, and the innovation is to improve the calculation efficiency by two-point gradient iterative method, and the accuracy of image reconstruction is improved by the selection of regularization term.The core of the application is to use the characteristics of acoustic-electric hybrid imaging, that is, when the boundary detection current is applied, the power density data is obtained by using ultrasonic disturbance, so as to obtain the internal data of biological tissue.At the same time, according to the different characteristics of different biological tissue conductivity, different regularization terms are introduced, two-point gradient iterative method is established, and high-resolution reconstruction of biological tissue conductivity is realized.Compared with the traditional acoustic-electric imaging method, the application reduces the calculation and storage cost of multiple observation currents, improves the imaging efficiency.And the iteration process is modified by using a special regularization term, so that the boundaries or geometric characteristics of different tissues can be accurately determined, and the imaging accuracy is improved.

This invention belongs to the field of geophysical exploration technology, and specifically relates to a magnetotelluric two-dimensional imaging method based on a visual self-attention mechanism. The method of this invention is an end-to-end deep learning imaging approach, which has a significant advantage in computational time compared to traditional inversion methods. By constructing a geophysical theoretical model generation program, diverse geoelectric theoretical models are generated in batches, ensuring the scale and diversity of training samples. By introducing a pre-training process, the self-attention mechanism, with its stronger modeling ability and better ability to capture relative relationships in the data compared to convolutional structures, improves the model's generalization ability. Addressing the problem of missing information about deep anomalies when using only a single mode response data, a magnetotelluric two-dimensional imaging network suitable for TE / TM joint modes is proposed. By optimizing and improving the relative position encoding in the network, the model can correctly acquire and fuse input information from both TE and TM modes.

The invention discloses a working method and system of a projection camera integrated with a temperature control function, and relates to the field of cameras. The method comprises the following steps: synchronously acquiring an infrared thermal field, dark current of an image sensor and a duty state of a micro-mirror array, and calculating a multi-source thermal disturbance characteristic value through an entropy algorithm and photo-thermal phase difference analysis; driving a thermal diffusion diagram neural network by the characteristic values, inverting a thermal strain field, and projecting the thermal strain field to a Zernike basis function space to generate a thermally induced aberration risk index and a thermodynamic diagram; calculating an active temperature control intervention level and a strategy parameter through an adaptive threshold value and fuzzy reasoning based on the risk index and the convection intensity estimation value; constructing a multi-objective non-convex optimization problem according to the intervention level, and solving to obtain a collaborative scheduling weight and an optimization instruction; and extracting the maximum Lyapunov index and generating a thermal stability look-ahead confidence coefficient with the risk index to predict future thermal evolution and perform adaptive regulation and control. According to the invention, the imaging precision of the projection camera under thermal disturbance is improved through multi-level cooperative temperature control.

This invention belongs to the field of motor technology and discloses a high-linearity finite-angle torque motor, comprising a cylindrical rotor and a cylindrical stator, with the rotor housed within the stator. The stator includes N coils and N constant magnetic circuit channels, where N is an even number of at least 2. The rotor's magnet portion has N polarities. The N coils of the stator are evenly arranged circumferentially on the inner side of the stator, with adjacent coils separated by constant magnetic circuit channels. The ends of all coil frames and the ends of the constant magnetic circuit channels together form the rotor's rotational track. Adjacent stator coils have opposite polarities after being energized, and adjacent rotor magnets also have opposite polarities. This invention employs a special stator lamination structure, theoretically eliminating stator cogging torque within the motor's operating angle range, thus improving the linearity of the motor's output torque. Compared to traditional slotted finite-angle torque motors, the output torque fluctuation is reduced by more than 70%.

This invention discloses a tomographic SAR three-dimensional imaging method for low-altitude platforms, comprising the following steps: acquiring SAR images; performing sparse inversion on the SAR images within a lower viewpoint constraint range based on a cylindrical wave TomoSAR imaging model to determine the scattering coefficients of the scatterer signal along the elevation direction in the pixels; calculating the lower viewpoint parameters based on the scattering coefficients; and generating the position coordinates of the scatterer in the ground coordinate system based on the lower viewpoint parameters. This invention, by constructing a cylindrical wave TomoSAR imaging model for sparse inversion, can correct the geometric deformation of the scatterer, significantly improving the three-dimensional imaging accuracy of the scatterer. Simultaneously, by adaptively determining the elevation search range based on the elevation constraint, elevation deblurring is achieved, further enhancing imaging accuracy.

The application discloses a kind of modular configurable tooling detection methods, belong to tooling detection field, specifically include: module configuration step, automatic detection step, detection result processing step.Before detection, detection group leader configures detection hardware according to detection plan, software platform.When the unit to be detected is placed in the area to be detected, detection personnel start main control machine, and start automatic detection process according to the configuration parameters of detection scheme module, detection strategy module and detection alarm module after authentication.After detection, whether the detection data is entered into database according to the parameters configured by data analysis module is processed by main control software;Whether detection report is saved or printed;The application is adapted to the detection needs of the unit to be detected constantly upgrading iteration by the modularization and configurability of detection hardware and software platform, and the problem that error reproduction is difficult, error chain is deep and difficult to locate is solved by error tracing module.

The invention provides an inflection wave imaging method based on reverse time migration, and the method comprises the steps: 1, carrying out the extrapolation of a seismic source wave field and a detection point wave field, and extracting the local ray parameters of the wave fields; 2, calculating a local stratigraphic dip angle of the wave field; 3, if the local stratigraphic dip angle is larger than 90 degrees, the inflection wave single-shot imaging result is calculated; if the local stratigraphic dip angle is smaller than 90 degrees, an imaging reflection angle is calculated; 4, calculating an inflection wave imaging result; 5, accumulating single shot results to a final imaging result; and step 6, repeating the steps 1 to 5 until all shots are calculated. According to the inflection wave imaging method based on reverse time migration, an inflection wave is imaged by using a two-way wave equation wave field bidirectional continuation reverse time migration method, so that the imaging precision of a high and steep dip angle complex structure is improved, and technical support is provided for especially exploration of high and steep structure complex areas such as salt mounds, igneous rocks and reverse masks.

This invention discloses an AI-based multi-source, multi-receiver inter-well seismic data acquisition, processing, and interpretation system and method, relating to the interdisciplinary field of artificial intelligence and geophysical exploration. The system includes: multiple downhole artificial seismic sources, multiple inter-well seismic signal receiving devices, a distributed acquisition and control network, and an AI processing and interpretation platform. This invention supports four stereoscopic acquisition modes: single-well excitation of adjacent well reception, single-well excitation of multiple well reception, multiple-well excitation of single-well reception, and multiple-well excitation of multiple well reception. Through deep learning models, it achieves intelligent denoising, automatic first arrival picking, intelligent wavefield separation, AI-driven full-waveform inversion velocity modeling, intelligent amplitude-preserving migration imaging, and reservoir fluid prediction. Finally, it combines reinforcement learning to optimize development well deployment. This invention realizes intelligent management of the entire process of inter-well seismic data acquisition, processing, and interpretation, significantly improving the acquisition efficiency, imaging resolution, and reservoir description accuracy of inter-well seismic data.

This invention discloses a method and device for three-dimensional electrical impedance tomography (EIT) of the thoracic cavity. The method includes acquiring a three-dimensional point cloud of the thoracic cavity region of the subject to establish a three-dimensional thoracic cavity model; performing device self-test and checking electrode fit; generating a predetermined excitation signal and injecting it into the subject; acquiring voltage signals from each electrode; separating and filtering EIT and ECG signals; performing forward problem calculation on the voltage signals based on the subject's three-dimensional thoracic cavity model to obtain the potentials of each electrode in the three-dimensional thoracic cavity model; and performing three-dimensional reconstruction using the single-step Gauss-Newton method to obtain an electrical impedance tomography map of pulmonary ventilation changes. This invention, by constructing a three-dimensional thoracic cavity model of the subject, performing forward problem calculation on the voltage signals, and further reconstructing the image, can achieve real-time, high-precision three-dimensional dynamic imaging of the subject's thoracic cavity with high imaging accuracy.

The application discloses a high-resolution acoustic imaging method based on adaptive subspace weighting, which comprises the following steps: reading a multi-channel time-domain acoustic signal collected by a microphone array; generating a dynamic adaptive window function based on the spectral characteristics of a current signal frame to suppress spectral leakage; performing windowing processing on the signal by using the dynamic adaptive window function and performing Fourier transform to generate frequency-domain snapshot data; constructing a covariance matrix for each analysis frequency bin and then averaging to obtain a final covariance matrix of a sound source signal; performing diagonal loading processing on the covariance matrix by using an adaptive two-domain regularization method; performing eigenvalue decomposition on the covariance matrix and dividing the covariance matrix into a signal subspace and a noise subspace; establishing a fine scanning grid; precalculating the steering vectors of all grid points and storing the steering vectors as an array manifold matrix; and performing weighted fusion on a fine spatial response map and a coarse spatial response map by using a multi-scale spatial response fusion strategy to generate a final acoustic imaging map.

The present application relates to biomedical micro-imaging and cell pathology detection technical field, especially to a kind of alveolar lavage fluid macrophage terahertz near-field imaging identification method.Its technical scheme includes the following steps: the unstained alveolar lavage fluid cell smear sample is fixed on the object table, the sample is observed under bright field using optical microscope, the suspected micro area with volume difference or nuclear shape shadow characteristics is locked, and the near-field probe is focused to the suspected micro area;The suspected micro area is scanned in a large range using a terahertz near-field imaging system, and surface topography images and terahertz internal tomography images are obtained.According to the size characteristics of the target object in the image and the uniformity characteristics of the terahertz signal, the background interference cells are excluded.The present application provides a terahertz near-field imaging method that can quickly and objectively identify different physiological state macrophages without staining, based on the dual-mode signals of topography elevation and optical voltage.

This invention discloses a high-density structured light generation device, belonging to the technical field of structured light generation equipment. A metasurface device is integrated on the front end of a polarization-maintaining fiber. Light emitted from a light source is transmitted through the fiber to the metasurface device, and then the metasurface generates a structured light projection point cloud pattern at a predetermined location. The portion of the fiber extending into the imaging area has a diameter on par with the fiber diameter, making it smaller in size compared to traditional structured light projection systems that transmit light through free space. Furthermore, it can penetrate curved spaces to project structured light point clouds. The light-guiding fiber is a polarization-maintaining fiber, which can maintain the polarization characteristics of the beam during transmission. The metasurface microstructure used is a multi-channel multiplexed metasurface, which can modulate incident light of different wavelengths and polarizations, thereby simultaneously generating projection patterns from different channels at a predetermined location. By superimposing these patterns, the density of the projection point cloud is greatly increased, thus improving imaging accuracy in 3D imaging.

This application relates to the field of medical molds, specifically disclosing a medical rotating arm and its manufacturing process. The medical rotating arm includes a support arm, an end-face gear, and a positioning plate. The end-face gear and the positioning plate are fixed horizontally to the same end of the support arm. A mounting groove is provided between the end-face gear and the positioning plate. The support arm, the end-face gear, and the positioning plate are all integrally formed in a rotating arm mold using resin-impregnated carbon fiber cloth and hot-press casting. The medical rotating arm of this application can be used in CT scanning equipment and X-ray machines. It has good mechanical properties, can withstand large forces without rotating, reduces the use of metal materials, and avoids the problem of metal materials affecting the imaging accuracy of scanning equipment.

The present application relates to a kind of based on the apparent conductivity fast imaging method of magnetic phase gradient and its application, the method combines magnetic phase and electromagnetic field gradient identification ability to underground electrical structure, with the phase gradient of magnetic field Hz component as imaging parameter and carries out imaging, avoids the error interference of magnetic field multiple component acquisition.The present application can be applied to the fast imaging of underground electrical structure;Particularly, the metal mine area of conductivity far greater than dielectric loss.Compared with the traditional apparent resistivity imaging method, the present application carries out imaging by the phase gradient of magnetic field Hz component, shows strong adaptability under different burial depth, electrical characteristics and noise environment, without background field correction in imaging process, avoids the adverse effects of background resistivity calculation error on imaging result, while simplifying the calculation process, reduces the complexity of imaging process, effectively improves the working efficiency and practicality of the method.

The invention provides a design method, system, equipment and medium based on a residual gas well underground combined mining three-dimensional observation system, and belongs to the technical field of petroleum geophysical exploration. According to the method, aiming at the problems of complicated geological conditions and insufficient resolution of a conventional observation system in residual gas exploration, observation points are arranged by comprehensively analyzing geological condition factors and technical parameters of the observation system and adopting a multi-dimensional optimization strategy. The method specifically comprises the following steps: constructing a fitness function based on wave field energy coverage maximization, reflection interface coverage and geological parameter mean square error minimization, and carrying out adaptive observation point position design; according to the dimension difference of well-ground combined mining, ground excitation points are finely adjusted to make up a well periphery covering density gap; and on the basis of a static correction principle, according to topographic relief and reservoir heterogeneity characteristics, excitation and receiving parameters are adjusted in a partitioned manner. The method can effectively improve the signal-to-noise ratio and imaging precision of seismic data under complex geological conditions, accurately depicts the residual gas distribution, and improves the exploration efficiency.

The invention relates to the technical field of X-ray tube manufacturing, in particular to an X-ray tube flat plate filament and a cathode assembly. Comprising a filament plate, the filament plate comprises a transmitting end face, a first metal layer is attached to the transmitting end face of the filament plate and / or a second metal layer is attached to the end face of the side, away from the transmitting end face, of the filament plate, the work function of the first metal layer is lower than the material of the filament plate, and the work function of the second metal layer is higher than the material of the filament plate. After the filament plate is electrified, electrons are emitted from one side of the emission end face to the anode target disc. The invention has the advantages of good emission characteristic and long service life.

The utility model relates to CCD missing item detection equipment technical field especially for a kind of copper bar and sheet metal piece CCD missing item detection equipment of automobile electric control system, including support frame, the inner side fixed mounting of support frame has conveyor belt body, the middle part of support frame upper surface is fixed with equipment rack, the top of equipment rack is fixedly installed with linear motor, the moving end of linear motor is fixed with mounting seat, the outer side of mounting seat is fixed with CCD detection camera by bolt, the detection end of CCD detection camera corresponds with the middle part of conveyor belt body, the front end of support frame is fixed with automatic correction mechanism;Automatic correction mechanism includes two correction mechanism support, the inside fixed of correction mechanism support has support seat, the top of support seat is fixed with electric cylinder, in the utility model, the attitude deviation problem when detecting copper bar and sheet metal piece of automobile electric control system is solved, correction process does not need to stop machine manual intervention, greatly improves detection efficiency and quality.

This invention discloses a rapid quantitative differential interferometry microscopy system and method based on holographic recording. The system includes a partially coherent illumination module and, sequentially arranged along the optical axis of the partially coherent illumination module, a microscope objective, a microscope tube lens, a transmission grating, a first linear polarizer, a first thin lens, a half-wave plate, a light-shielding plate, a phase-type spatial light modulator, a second thin lens, a second linear polarizer, and an image acquisition module. This invention utilizes a phase-type spatial light modulator to achieve shear shifts in any direction and to any degree, making it suitable for various applications. The system uses the grating carrier frequency to achieve holographic recording of differential interferometry, enabling quantitative differential interferometry detection of the sample using only two acquired images. It exhibits very high temporal resolution, spatial resolution, and imaging accuracy, showing broad application prospects in biological imaging and industrial detection.

This application provides a security inspection device, including a first housing assembly, a rotor support, a first X-ray device, and a first detection device. The first housing assembly forms a detection channel. The first housing assembly includes a first housing, a second housing, and a connector connecting the first housing and the second housing. The connector is elastically deformable under stress. The rotor support is rotatable along the circumferential direction of the first housing assembly. The first X-ray device and the first detection device are mounted on the rotor support. The beam outlet of the first X-ray device corresponds to the second housing, and the X-rays emitted by the first X-ray device can penetrate the second housing and enter the detection channel. The first detection device is used to receive the X-rays emitted by the first X-ray device. The connector allows for a flexible connection between the first housing and the second housing. Compared to a rigid connection between the first housing and the second housing, the deformation of the connector can compensate for certain installation errors, thermal expansion and contraction, or vibrations, improving the positional accuracy of the field of view (FOD) and thus enhancing the imaging accuracy of the security inspection device.

The application discloses a SAR comb spectrum interference suppression method based on a double-channel attention residual network, and comprises the following steps: acquiring a time domain echo signal with comb spectrum interference; transforming the time domain echo signal to a frequency domain to obtain a frequency domain echo signal with interference; extracting the real part and the imaginary part of the frequency domain echo signal with interference to obtain a real part signal with interference and an imaginary part signal with interference; inputting the real part signal with interference and the imaginary part signal with interference into a pre-trained double-channel attention residual network to suppress the comb spectrum interference and output a frequency domain echo signal; the pre-trained double-channel attention residual network comprises two suppression networks with the same structure, and each suppression network comprises a channel attention residual block and a global attention block; wherein one suppression network is used for reconstructing a real part signal according to an input real part signal with interference, and the other suppression network is used for reconstructing an imaginary part signal according to an input imaginary part signal with interference.

This invention relates to the field of metal environment imaging, and more particularly to an environmental imaging method and apparatus based on millimeter-wave radar. The method includes the following steps: transmitting multi-frequency signals to the metal environment to be detected using a millimeter-wave radar array, and extracting multipath signal sequences; performing interferometric phase analysis based on the multipath signal sequences to obtain the three-dimensional coordinates of the metal and the actual target reflection point; performing iterative forward calculation based on the three-dimensional coordinates of the metal and the actual target reflection point to obtain a first metal environment image; and performing iterative residual convergence on the first metal environment image to output a second metal environment image. This invention achieves high-precision and reliable three-dimensional imaging of complex metal environments.

This invention discloses a multi-channel light-slice microscopic imaging device. The image acquisition module includes multiple image detectors. A laser array emits multiple excitation beams of different wavelengths, which are then combined into a single incident beam by an optical path module. This incident beam passes through a scanning galvanometer and an imaging module before illuminating the sample on a stage mounted on a three-dimensional displacement platform. The imaging objective in the imaging module collects fluorescence signals from the sample, which are then split by the beam-splitting module to form multiple fluorescence signals of different wavelengths and projected onto the multiple image detectors. Each image detector forms an image imaging channel. Multiple image imaging channels receive multiple fluorescence signals of different wavelengths and transmit them to the corresponding image detectors. The three-dimensional displacement platform enables three-dimensional displacement movement of the sample slice. By employing a strategy of continuous motion imaging of the sample slice and simultaneous detection and acquisition of fluorescence signals by multiple image detectors, the time interval between sample preparation and imaging, as well as the pauses during imaging, can be reduced.

The present application relates to the technical field of hydraulic fracturing monitoring, and particularly relates to a real-time monitoring and three-dimensional imaging method for true triaxial hydraulic fracturing cracks, which comprises the following steps: screening signals with crack development characteristics and marking them as monitoring crack signals; screening crack continuous states and crack types in the monitoring crack signals, based on the distribution characteristics of the crack continuous states among different monitoring signals, segmenting and splicing the crack types across signals to generate continuous imaging processing signals; extracting crack morphology information and crack spatial positions in the imaging processing signals, and based on the crack spatial positions and the number of crack types, judging whether there are features of mutual influence of multiple cracks in the imaging processing signals. The present application solves the problems of signal distortion and imaging distortion caused by the superposition or intersection of multiple cracks, differentiates the interference-free and multiple-crack interference scenes through differential processing, introduces distortion prediction and reverse correction, and realizes accurate three-dimensional real-time imaging of crack morphology, spatial position and interaction.

The invention provides a TTI (Transmission Time Interval) least square migration imaging method, electronic equipment, a storage medium and a TTI least square migration imaging device. The TTI least square migration imaging method comprises the following steps: acquiring a TTI reverse time migration image, a vertical equivalent migration speed and an anisotropic parameter; based on a point scattering model of uniform sparse sampling, obtaining a TTI point spread function by using a TTI acoustic wave demigration equation and TTI reverse time migration; carrying out regional partitioning on the TTI reverse time migration image and the TTI point spread function; fourier transform is utilized to convert the TTI reverse time migration image after blocking and the TTI point spread function after blocking into a frequency wavenumber domain; performing high-dimensional space deconvolution of an imaging domain by using the TTI reverse time migration image of the wave number domain and the TTI point spread function of the wave number domain to obtain a least square imaging result of the wave number domain; and Fourier inversion is carried out on the wavenumber domain least square imaging result to obtain a least square imaging result. According to the method, on the basis of anisotropic propagation, the imaging domain least square imaging adaptive to the TTI medium is constructed, the influence on the imaging position and the amplitude can be eliminated, and the imaging precision is improved.

The invention relates to the technical field of fluid mechanics experimental equipment, discloses a rotary fluid test platform and method for a rotary table, and aims to solve the problems of incapability of synchronously measuring a velocity field and a concentration field, difficulty in multi-section measurement, insufficient platform stability and optical distortion interference in the prior art. The platform comprises a rotating system, a fluid mixing system, a fluid testing system and a control and data processing system, the fluid testing system integrates PIV and PLIF technologies, multiple sections are irradiated through beam splitting laser, multiple cameras synchronously collect signals, the fluid mixing system adopts a refractive index matching solution to eliminate wall surface refraction, and the rotating system has an inclination angle adjusting function. According to the invention, multi-field synchronous measurement and wide-area multi-section test are realized, the measurement precision and stability are improved, and the device is suitable for accurate measurement of parameters such as speed and concentration under various rotating fluid working conditions, and is suitable for rotating fluid research in the fields of aerospace and the like.

This utility model relates to the field of medical device technology, and in particular to an intraoral scanning lens fixing structure and an intraoral scanning device. The intraoral scanning lens fixing structure includes: an optical engine housing with an installation channel and a fixing hole, the installation channel communicating with the fixing hole; a lens module installed in the installation channel; the projections of the lens module installed in the installation channel and the fixing hole on a plane perpendicular to the depth direction of the fixing hole at least partially overlap; a press-fitting component installed in the fixing hole, with the side of the press-fitting component facing the installation channel abutting against the outer wall of the lens module. This utility model enables the lens module to be fixed in the installation channel. During installation, the position of the lens module in the installation channel can be adjusted to achieve adjustment of parameters such as focal length, reducing errors. This eliminates the need for a high-precision housing for positioning and compensates for errors during lens module manufacturing, improving imaging accuracy and thus meeting the requirements of intraoral scanning devices.