46 results about "Domain imaging" patented technology

The invention discloses an ultrafast three-dimensional wave number domain imaging method based on a row-column addressing ultrasonic array, which realizes ultrafast three-dimensional ultrasonic volume imaging by combining wave number domain image reconstruction based on row-column addressing (RCA) ultrasonic array probe data acquisition. According to the method, the three-dimensional volume imaging capability and channel number advantages of an RCA ultrasonic array probe and fewer emission times of plane wave imaging (PWI) are utilized, so that the volume acquisition rate is increased, and the data volume is reduced; according to the method, wave number domain image reconstruction is executed, rapid reconstruction of three-dimensional volume data can be realized by utilizing the calculation efficiency of fast Fourier transform, and the three-dimensional imaging requirements of high resolution and high frame rate are met. Compared with a time domain delay superposition algorithm, the method has remarkable technical advantages and is expected to be popularized and applied to medical and industrial detection scenes needing real-time three-dimensional volume imaging.

The utility model provides a double head-up display fusion imaging system, which relates to the field of automobiles, and generates a first light beam and a second light beam carrying different projection information through an image generation unit, and adopts a diffusion element to carry out uniform light diffusion on the first light beam and the second light beam. The diffused first light beam is projected to a first position of the windshield by adopting the reflector assembly, the diffused second light beam is projected to a second position of the windshield, the light beam projected to the first position generates a diffraction effect under the action of the holographic optical element, and a close-shot image is formed in front of the windshield; the light beam projected at the second position forms a long-shot image in front of the windshield so as to display the long-shot image information carried by the second light beam. In the imaging system, only one holographic optical element and one set of optical transmission system are needed to complete display of two paths of projection information, and the system is simple in structure and smaller in size.

The invention provides a calibration and interpretation method based on depth domain seismic data, and the method comprises the steps: S1, carrying out the speed structure analysis of VSP data, and carrying out the reliability evaluation; s2, well seismic calibration interpretation is carried out according to the VSP data; s3, longitudinally and transversely analyzing deviation distribution characteristics, and exploring main control factors of deviation distribution; and S4, according to the main control factors, obtaining a structure interpretation result map after depth correction. According to a calibration result, depth domain error characteristics are analyzed, depth domain interpretation longitudinal deviation is reduced, depth domain structure interpretation precision is improved, and the problem that depth domain imaging depth error correction is difficult is solved.

A system and method for contact-based spatial frequency domain imaging. A medium to be imaged is contacted by a sheet comprising an array of lighting elements generating illumination light patterns illuminating the medium, and comprising an array of sensor elements measuring spatially resolved images of resulting light patterns reflected back after interaction of the illumination light patterns with the medium. The lighting elements generate illumination light patterns that are spatially modulated in light intensity along a surface of the illuminated medium according to a respective different spatial frequency. A set of spatially modulated images is determined based on the measured resulting light patterns caused by the different illumination light patterns. An image of the medium can be generated based on a combination of the spatially modulated images.

The invention discloses an imaging device, and belongs to the technical field of optical imaging, the imaging device comprises an optical system and an image sensor, the optical system comprises a first optical assembly and a second optical assembly, the first optical assembly comprises a first lens, and the second optical assembly comprises a second lens. The image sensor comprises a first sensing part and a second sensing part, the first sensing part is used for sensing emergent light of the first optical assembly, the second sensing part is used for sensing emergent light of the second optical assembly, and the chief ray angle of the first lens is matched with the chief ray angle of the first sensing part; and / or the chief ray angle of the second lens is matched with the chief ray angle of the second sensing part; the imaging device can share one image sensor when the first optical assembly and the second optical assembly are used for imaging of multiple field angles, the complexity of the imaging device is reduced, and the cost of the imaging device is reduced.

The application discloses a laser scanning welding system and method for ultrathin high polymer diaphragms, aiming at solving the technical problem that the ultrathin diaphragm is easy to deform during welding. The system comprises an ultrasonic welding module, a laser welding module and a spatial frequency domain imaging module. During welding, the edges of the upper frame of the diaphragm, the ultrathin high polymer diaphragm and the lower frame of the diaphragm are first positioned by preliminary spot welding through the ultrasonic welding module; then, the laser welding module utilizes the characteristics that the upper frame of the diaphragm is transparent and the lower frame of the diaphragm is light-absorbing, so that the laser penetrates the upper frame and performs scanning welding at the contact interface of the diaphragm and the lower frame, realizing fusion; in this process, the spatial frequency domain imaging module projects a grating pattern on the surface of the diaphragm and analyzes the deformation, calculates the welding thermal field distribution in real time, and then feeds back the control of the laser parameters, so that the deformation amount of the diaphragm is always within the controllable range. The application realizes high-precision, low-heat-affected and non-deformation welding of the ultrathin high polymer diaphragm.

This invention discloses a single-snapshot spatial frequency domain imaging and morphology correction method, system, and device, comprising: acquiring a set of monochromatic fringe images with different center wavelengths based on the same projected image; simultaneously inputting each monochromatic fringe image in the set into two parallel and independent deep learning networks, wherein the first deep learning network is used to extract the DC and AC components of the image; the second deep learning network is used to extract the wrapping phase component and fringe hierarchy information of the image, and perform absolute phase calculation to obtain the three-dimensional morphology before correction; performing height correction on the three-dimensional morphology and calculating the corrected diffuse reflectance image; performing background segmentation on the corrected diffuse reflectance image and spatially aligning it to the same coordinate system; and retrieving the optical characteristic parameters and physiological parameters of the tissue based on the spatially registered multi-wavelength diffuse reflectance data. This invention ultimately achieves real-time, wide-field, high-precision, and highly robust quantitative imaging of tissue physiological parameters.

The embodiment of the invention discloses a three-dimensional imaging method and system of a millimeter wave MIMO radar. The method comprises the following steps: acquiring echo data of a to-be-measured target by using a millimeter wave MIMO radar; carrying out IFFT (Inverse Fast Fourier Transform) processing about time angular frequency on the echo data to obtain a one-dimensional range profile image; determining the position range of the to-be-measured target according to the one-dimensional range profile image; performing phase compensation of distance layering on the echo data according to the position range and the distance resolution of the millimeter wave MIMO radar; performing slicing processing and wavenumber domain imaging on the phase compensation result in the distance direction within the position range of the to-be-measured target to obtain a two-dimensional image at the distance direction slicing position; and traversing the two-dimensional images at the distance direction slices to synthesize a three-dimensional image.

The invention discloses a laser scanning welding system and method for an ultra-thin polymer vibrating diaphragm, and aims to solve the technical problem that the ultra-thin vibrating diaphragm is easy to deform during welding. The system comprises an ultrasonic welding module, a laser welding module and a spatial frequency domain imaging module. During welding, firstly, the edges of the vibrating diaphragm upper frame, the ultra-thin polymer vibrating diaphragm and the vibrating diaphragm lower frame are subjected to preliminary spot welding positioning through the ultrasonic welding module; then, the laser welding module enables laser to penetrate through the upper frame according to the characteristics that the upper frame of the vibrating diaphragm is transparent and the lower frame of the vibrating diaphragm absorbs light, scanning welding is conducted on the contact interface of the vibrating diaphragm and the lower frame, and fusion is achieved; in the process, the spatial frequency domain imaging module projects grating patterns to the surface of the vibrating diaphragm and analyzes deformation of the vibrating diaphragm, welding thermal field distribution is calculated in real time, laser parameters are fed back and controlled, and it is ensured that the deformation amount of the vibrating diaphragm is always within a controllable range. According to the invention, high-precision, low-heat-influence and deformation-free welding of the ultrathin high-molecular vibrating diaphragm is realized.

This application discloses an optical system for detecting vertical laser beam collimation, belonging to the field of optical system technology. An imaging component, a lens, a semi-reflective beam splitter, and a second reflective component are arranged sequentially along the length of a mounting stage. A mounting slot for mounting the incident light component is provided on the mounting stage. The mounting slot, the semi-reflective beam splitter, and the first reflective component are arranged sequentially along the height of the mounting stage. The optical system for detecting vertical laser beam collimation disclosed in this invention has a simple structure and does not require adjustment each time it is used, eliminating the thermal drift error introduced by the electronic level in traditional methods. This eliminates the need for periodic calibration of thermal drift, enabling the system to achieve automated detection of the vertical beam deflection angle over long periods. Furthermore, it can calculate the beam spacing S based on the beam spot position acquired by the imaging component and then further calculate the inclination of the incident light.

The application discloses a kind of biological tissue optical characteristic parameter space frequency domain imaging method based on absorption rate, comprising the following steps: setting biological tissue Monte Carlo simulation parameter;Absorption rate-based biological tissue optical characteristic parameter look-up table is constructed by Monte Carlo simulation and one-dimensional zero-order Hankel transformation;For reference phantom projection cosine illumination pattern and collect fringe image;For the fringe image, Fourier transform, frequency domain filtering and inverse Fourier transform are carried out to obtain direct current component and alternating current component modulation degree;Reference phantom is replaced by measured biological tissue body, and the direct current component and alternating current component modulation degree are obtained by repeating the preceding 2 steps;Direct current and alternating current absorption rate measurement value are calculated;The minimum value of absorption rate Euclidean distance is calculated, and the absorption coefficient and reduced scattering coefficient measurement result are obtained by table lookup, to obtain optical characteristic parameter image.The application takes biological tissue absorption rate as the starting point of optical characteristic parameter inversion, significantly improves imaging sensitivity and reduces inversion error.

The application provides a middle-high orbit SAR fast time domain imaging method based on a self-defined scene coordinate system, and relates to the technical field of radar imaging. The method comprises the following steps: firstly, according to the complex imaging geometric characteristics of the middle-high orbit SAR in the large squint mode, the analytical expression of the wave number support area in the squint mode is calculated. Secondly, aiming at the characteristics of the middle-high orbit SAR imaging, such as the super wide swath and the super long synthetic aperture time, the application provides a fast time domain imaging algorithm, which can effectively process the imaging data and meet the imaging mode of the middle-high orbit SAR. Finally, according to the arrangement mode of the imaging grid, combined with the characteristics that the radar beam footprint is not fixed and the ground sidelobe direction is not consistent, the imaging algorithm can meet the complex imaging geometric conditions of the middle-high orbit SAR in different orbit segments, downward angles and squint angles, and can self-define a two-dimensional direction flexible and non-orthogonal scene coordinate system, so as to meet the imaging processing requirements of the middle-high orbit SAR in different imaging modes.

The application discloses an imaging domain least square migration method and device, electronic equipment and medium. The method can comprise: acquiring a global space-varying scattering function, interpolating and reconstructing the global space-varying scattering function to generate a plurality of scattering function data volumes; calculating the spatial deconvolution of the plurality of scattering function data volumes according to a depth domain imaging volume through an MPI parallel strategy to obtain corresponding least square migration images; and reducing the least square migration images corresponding to the plurality of scattering function data volumes to obtain a final imaging result. The application encrypts the point spread function through the interpolation and reconstruction strategy, and further deconvolves the reconstruction to suppress discontinuous noise through multiple superimpositions to obtain higher imaging accuracy.

This application provides a method, system, device, and storage medium for realizing a depth-domain imaging surface. The method includes applying a total correction to preprocessed time-domain data to correct a fixed surface, obtaining a final reference surface; secondly, using the travel time information of the first arrival wave of an earthquake to invert the near-surface velocity structure, extracting the velocity and thickness of the weathering layer from the tomographic static correction, and calculating the time correction. This invention, through time-domain tomographic static correction, corrects the weathering layer data to the water table, effectively avoiding the difficulty of near-surface velocity modeling. It quickly and effectively achieves depth-domain modeling and imaging. By utilizing the concept of time-domain static correction, seismic data is corrected to the water table, thus avoiding near-surface velocity modeling and directly starting mid-to-deep modeling from the water table. This shortens the processing cycle and improves velocity accuracy, which is beneficial for seismic imaging.

This disclosure relates to the field of oil and gas exploration technology, and in particular to a method, apparatus, equipment, medium, and product for imaging domain reflection wave waveform inversion. The method includes: calculating the gradient corresponding to each offset and a pre-constructed velocity model; defining an objective function for imaging domain reflection wave waveform inversion based on the gradients corresponding to all offsets; calculating the update gradient of the objective function corresponding to the velocity model; updating the velocity model based on the update gradient; and performing imaging domain reflection wave waveform inversion based on the converged velocity model. By defining the objective function for imaging domain reflection wave waveform inversion and calculating the update gradient of the objective function corresponding to the velocity model, and updating the velocity model, imaging domain reflection wave waveform inversion is achieved. This directly improves the imaging quality in the depth domain and compensates for the shortcomings of reflection wave waveform inversion applications with depth domain imaging as the ultimate goal.

The invention discloses a three-dimensional VSP and ground seismic joint migration method, system and device and a storage medium, and relates to the technical field of seismic exploration, and the method comprises the steps: obtaining vertical seismic section data and ground seismic data, and obtaining a preprocessed data body; performing isotropic migration velocity modeling on the two sets of data volumes to obtain respective imaging gathers and migration profiles; performing unification processing on the imaging reference surfaces of the two sets of data volumes to obtain a processed imaging gather; performing well-ground joint migration on the processed imaging gather to obtain a well-ground joint OVT domain imaging gather; and azimuth anisotropy correction of travel time is carried out on the well-ground combined OVT domain imaging gathers, superposition processing is carried out on the corrected imaging gathers, and finally a well-ground combined migration imaging profile is obtained. According to the invention, effective fusion and high-precision imaging of well-ground data are realized, and the imaging precision of seismic data and the success rate of oil-gas exploration are improved.

The invention provides an optical non-vision-field imaging method and device based on Gaussian splashing, electronic equipment and a storage medium, and can be applied to the technical field of optical imaging. The method comprises the following steps: obtaining a Gaussian ellipsoid set in a hidden space through a parameter random initialization operation; performing forward rendering on the laser detection signals of the Gaussian ellipsoids in the Gaussian ellipsoid set to obtain predicted photon flight time distribution; calculating a loss value between the predicted photon flight time distribution and the actually measured photon flight time distribution of the Gaussian ellipsoid, and updating the attribute parameters of the Gaussian ellipsoid by using the loss value; updating the Gaussian ellipsoid set based on the updated attribute parameters of the Gaussian ellipsoids; iteratively executing forward rendering, loss value calculation, attribute parameter updating and Gaussian ellipsoid set updating operations to obtain a target Gaussian ellipsoid set; and rendering the target Gaussian ellipsoid set into a two-dimensional grid map, and smoothing the two-dimensional grid map to obtain an optical non-vision field imaging result of the hidden space.

The invention discloses an angle gather extraction method and device based on construction direction constraint, electronic equipment and a storage medium. The method comprises the following steps: extracting an underground structure angle based on an earlier-stage migration imaging result or a speed model; calculating a shot point end Poynting vector based on an underground structure angle and a wave equation forward propagation wave field; calculating a normal vector of an underground reflection interface based on the underground structure angle; calculating an underground local reflection angle and a local azimuth angle based on the shot point end Poynting vector and the normal vector; an angle domain imaging condition is applied, corresponding reverse time migration is stored based on an underground local reflection angle and a local azimuth angle to obtain an imaging value, and a high-precision omni-directional angle domain common imaging point gather is formed. According to the method, the angle gather precision loss caused by inaccurate detection point wave field Poynting vector direction is avoided, and the precision of the omnibearing angle domain common imaging point gather is improved, so that the seismic imaging quality is remarkably improved.

The invention relates to the technical field of oil field geological exploration, in particular to an omnibearing angle gather extraction method based on a wave equation. The method comprises the following steps: acquiring preprocessed seismic data and a velocity field; determining imaging grids, azimuth angles and reflection angle ranges and intervals; constructing a self-adaptive threshold condition, and screening to generate an effective point table; calculating propagation vectors in the effective point table; calculating an underground reflection angle and an azimuth angle based on the propagation angle geometrical relationship; constructing an angle domain imaging condition based on the wave field propagation vector; based on the azimuth angle and reflection angle information, the single-shot imaging value is reduced; and repeating all shot data, and superposing to obtain a final section and an omnibearing angle gather. According to the method, the azimuth angle and reflection angle information of the underground imaging point is fully utilized, a high-precision imaging profile and an all-dimensional angle gather are output, and powerful support is provided for follow-up work such as azimuth superposition imaging and crack prediction.

The invention relates to a DMS superlens imaging lens and system, and belongs to the field of optical lenses, the imaging lens is sequentially provided with a diaphragm and a first lens from an object plane to an image plane along an optical axis, and the object side surface and / or the image side surface of the first lens are / is a metasurface. According to the imaging lens, large-target-surface visible light imaging is achieved only through one super lens, the complexity of a system is reduced, the size and weight are reduced, and cost is reduced.

The present invention discloses a handheld security inspection imaging method based on MEMS assistance. The present invention is intended to meet the needs of rapid and precise security inspection of personnel in crowded security inspection sites, and combines MEMS sensors with MIMO radar boards to form a high-precision, low-cost, convenient handheld security inspection imaging method. First, the radar board transmits a linear frequency modulation signal and receives the echo signal reflected by the target. During this period, the MEMS sensor feeds back the motion trajectory and position information of the handheld security inspection system in real time, providing accurate posture and position information. Secondly, the position of the MIMO radar antenna trajectory information is calibrated through the data of the MEMS sensor, and the accelerometer zero drift is compensated based on the wavelet packet change to reduce the error caused by the system movement and position change. Finally, the residual phase error is estimated and eliminated based on the particle swarm algorithm. On this basis, the wavenumber domain imaging algorithm is combined to realize non-contact three-dimensional imaging of the target. Finally, deep learning, image recognition and other technologies are combined to realize dangerous goods inspection.

The invention discloses a sound wave pseudo-depth domain reverse time migration imaging method and device based on equivalent staggered grids. The method comprises the steps of obtaining a depth domain velocity field of a target work area, performing forward modeling by using an equivalent staggered grid discrete equation of a homogeneous isotropic medium two-dimensional sound wave equation, and generating an observation data shot record; re-sampling the longitudinal grid of the depth domain velocity field, and converting the depth domain velocity field into a pseudo depth domain velocity field; according to an offset parameter and the pseudo depth domain velocity field, generating a seismic source forward propagation wave field by using an acoustic wave pseudo depth domain equation based on an equivalent staggered grid; according to the observation data shot record, wave field back propagation is carried out by using an acoustic wave pseudo-depth domain equation based on an equivalent staggered grid, and a detection point back propagation wave field is generated; and generating a pseudo-depth domain imaging result by using a cross-correlation imaging relationship according to the back propagation wave field of the detection point and the forward propagation wave field of the seismic source. According to the method, more efficient and higher-resolution pseudo-depth domain imaging is realized.

The embodiment of the invention provides a diffracted wave imaging method and device for an underground discontinuous geologic body, electronic equipment, a storage medium and a program product. The method comprises the following steps: carrying out migration on a seismic data set by utilizing a migration velocity field to obtain an angle domain imaging gather; by means of the angle domain imaging gather and a preset illumination angle calculation rule, the illumination angle at the travel time curve endpoint matched with each offset position is obtained through calculation; performing hyperbolic pulling positive and negative transformation on the offset angle gathers matched with the same offset positions by using the illumination angles at the end points of the travel time curve matched with each offset position to obtain diffracted wave signals corresponding to each offset position; and in response to an angle domain diffracted wave imaging gather constructed according to the diffracted wave signal corresponding to each shifted position, superposing the angle domain diffracted wave imaging gather by using the observation dip angle to obtain a diffracted wave image. By using the method of the embodiment of the invention, angle domain diffracted wave imaging can be realized.

The invention provides a common-aperture visible light and near-infrared polarization spectrum imaging device and method, and relates to the technical field of optical systems.The imaging device comprises a visible near-infrared telescope, a near-infrared imaging assembly, a visible light imaging assembly, a compensating mirror set, an LCVR assembly and an LCTF assembly; the system works cooperatively under a common-caliber framework composed of the near-infrared imaging assembly, the visible light imaging assembly and the light splitting assembly, visible light and near-infrared light are subjected to polarization spectrum imaging at the same time, the voltage of the LCVR assembly and the voltage of the LCTF assembly are accurately controlled, flexible modulation of the polarization state and wavelength of light is achieved, high-quality polarization spectrum information is obtained, and high-precision imaging is achieved. The polarization spectrum imaging system has the advantages of being high in efficiency and dynamic, effectively reducing light energy loss, achieving efficient polarization and spectrum modulation of a dynamic scene, and solving the technical problems that an existing polarization spectrum imaging system is large in size, low in integration level, low in response speed and serious in light energy loss.

The present invention discloses a time-reversal downhole seismic imaging method based on emergence angle information, which is applied to the field of seismic data processing and interpretation, and addresses the lack of a time-reversal downhole seismic imaging method based on emergence angle information in the prior art. The present invention utilizes a downhole seismic geophone to acquire three-component downhole seismic data, and performs horizontal component rotation, vertical component rotation, deconvolution, wave field separation, and data flattening processing. The invention utilizes radial component and vertical component data to obtain an emergence angle sequence. Based on the P component data, a root mean square velocity is calculated. Blank depth domain imaging data is generated and recorded as first imaging data. The root mean square velocity is used to convert second R component wave field data into depth domain data. The spatial position of each sample point in each trace is calculated based on a trigonometric function using the emergence angle sequence. The wave field amplitude data in the second R component is projected point by point and superimposed on the first imaging data to obtain final downhole seismic imaging data.

The invention discloses an on-line visual detection method and system for a die-cutting mylar product, and relates to the technical field of visual detection, and the method comprises the steps: constructing a multi-channel camera array comprising a transmission domain imaging channel and a reflection domain imaging channel, carrying out the geometric-spectrum joint calibration, obtaining the spatial registration matrix and spectral response mapping of each imaging channel, and obtaining the spatial registration matrix and spectral response mapping of each imaging channel; the initialization of the multi-channel camera array is completed; after the die-cut mylar product reaches a detection position, activating the multi-channel camera array to execute image acquisition, and establishing a cross-domain data stream; and sending the cross-domain data stream to a three-stack visual identification kernel, and establishing a defect identification result. The technical problems that in the prior art, due to the fact that transmission domain information and reflection domain information are difficult to obtain at the same time, the defect detection precision is insufficient, and the missing detection rate and the false detection rate are high are solved, and the technical effects of improving the comprehensiveness and accuracy of defect detection and achieving high-precision online defect recognition are achieved.

The present application relates to the technical field of seismic exploration data processing, and particularly relates to a method for identifying abnormal shot deviation results from massive shot domain seismic imaging data. The method mainly solves the problem that the existing seismic imaging data processing method cannot accurately identify single shot data with abnormal amplitude interference in massive data. The method comprises the following steps: performing seismic imaging processing on common shot point gathers by a computing node; performing stacking processing on common shot point imaging data; performing stacking processing on the computing nodes with abnormal amplitude deviation results step by step, identifying the common shot point gather numbers with abnormal amplitude deviation results; and re-performing migration processing on the identified common shot point gather number data with abnormal interference. The method can efficiently identify and eliminate single shot data with abnormal amplitude interference in shot domain imaging results, and can accurately lock single shot data with abnormal migration of CPU or GPU high-performance computing nodes, thereby ensuring the accuracy and quality of the imaging results.

The invention relates to a DMS superlens imaging lens and system, and belongs to the field of optical lenses, the imaging lens is sequentially provided with a diaphragm and a first lens from an object plane to an image plane along an optical axis, and the object side surface and / or the image side surface of the first lens are / is a metasurface. According to the imaging lens, large-target-surface visible light imaging is achieved only through one super lens, the complexity of a system is reduced, the size and weight are reduced, and cost is reduced.

This invention discloses a time-domain imaging method for spaceborne bistatic SAR non-track mode. The invention establishes an accurate bistatic time delay model based on a linear approximation of transmission delay, solving the problem of time-domain imaging defocusing caused by the failure of the "walk-stop" assumption in spaceborne bistatic SAR non-track mode, and achieving high-precision time-domain imaging in spaceborne bistatic SAR non-track mode.

The application discloses a method and device for picking up a same phase axis, and the method comprises the following steps: fitting each same phase axis in an angle domain imaging point gather by using a quadratic function to obtain a fitting curve of each same phase axis in the imaging gather; determining a fitting curve of the imaging gather according to the fitting curve of each same phase axis in the imaging gather; determining a top and bottom boundary of the fitting curve of the imaging gather, and taking the fitting curve in a top and bottom boundary range of the imaging gather profile as a final picked fitting curve. The same phase axis in the gather can be fitted by the quadratic function, the picking up precision of the same phase axis can be improved without being limited by the resolution of the seismic data, and the picked same phase axis can well coincide with the real same phase axis. Meanwhile, the picking up of the same phase axis does not need manual intervention and assistance, and the picking up efficiency of the same phase axis can be improved.