177 results about "Two dimensional imaging" patented technology

The invention relates to the technical field of image data processing, and discloses a fine metal powder defect detection method and system based on image recognition, and the method comprises the steps: illuminating a metal powder region through a non-polarized light source, and collecting two images in an orthogonal polarization state through imaging equipment with a linear polarizer, according to the method, the defect morphological fingerprints are constructed through the polarization information entropy, the three-dimensional structure information is converted into light field order degree change for detection, the dimension limitation of traditional two-dimensional imaging is broken through, and the detection accuracy is improved. Hidden defects such as internal pores and aggregates can be accurately identified, and meanwhile, stable detection and material defect cross discrimination under a dynamic working condition are realized in combination with motion compensation and multiband entropy ratio verification.

The invention discloses a pulsed eddy current detection method and system for a thermal power pipeline with a coating layer, and relates to the technical field of pulsed eddy current nondestructive detection.The pulsed eddy current detection method comprises the steps that pulsed eddy current detection simulation and experiment are conducted under the condition of a three-dimensional simulation model and a test piece, and excitation current waveform, amplitude and frequency parameters are determined; an induced voltage signal is collected, peak values, time points and attenuation characteristics are extracted, the corresponding relation between the wall thickness, the coating layer thickness and the welding seam structure and detection signals is constructed, a parameterized database is constructed, and temperature correction is completed; and optimizing a sensor structure and a signal acquisition scheme according to a parameterized database, obtaining detection data in a pipeline operation state, completing two-dimensional imaging of wall thickness distribution and welding seam positioning, and forming detection information covering a straight pipe, an elbow and a welding seam area. According to the method, wall thickness detection and welding seam positioning of the thermal power pipeline under the conditions of a thick wall and a thick coating layer are achieved through the full-process design of test piece modeling, simulation experiment and imaging collection.

The invention relates to the field of underwater detection, and provides a seabed static small target detection method suitable for an underwater vehicle, and the method comprises the steps: obtaining a plurality of underwater sonar images through a two-dimensional imaging sonar of the underwater vehicle; inputting a to-be-detected underwater sonar image into the underwater target detection model to extract features and detect the features to obtain an object category, bounding box coordinates and a confidence score; according to the method, target features are automatically extracted through a deep neural network in an end-to-end mode, a CAA module is introduced to capture a context dependency relationship between long-distance pixels in an image, a feature map with higher expressive power is generated by integrating context information, a model is helped to better distinguish a target object from a background, and the accuracy of the target object is improved. Therefore, the detection accuracy is improved.

The invention provides a thermal barrier coating defect analysis method based on terahertz multi-domain imaging weighted fusion, which comprises the following steps: according to different positions of defects in a thermal barrier coating, respectively intercepting signals of imaging modes of the surface, the interior, the lower interface and the integral structure of the thermal barrier coating from thermal barrier coating signals; calculating a time domain index value and a statistical domain index value in each signal, arranging the index values into a two-dimensional matrix, and drawing a two-dimensional imaging graph; carrying out fusion imaging on the two-dimensional image by adopting a weighted fusion method to obtain a terahertz fusion image; segmenting and identifying defect features in the terahertz fusion image to obtain defect type and size information; according to the thermal barrier coating falling failure judgment criterion, the failure state of the thermal barrier coating is evaluated according to the defect area proportion; according to the method, the terahertz multi-domain imaging graph is adopted to effectively extract the early internal defect characteristics of the thermal barrier coating, the defect characteristics are enhanced through weighted fusion imaging, and finally early internal defect detection and failure evaluation are achieved.

The invention provides a tensor completion method based on low-rank and sparse combined constraint, and the method is applied to radar high-resolution two-dimensional sparse reconstruction imaging so as to enhance sparse imaging performance. Radar high-resolution two-dimensional imaging is realized through the following steps: firstly, constructing a tensor model of radar data through a sliding window method to capture an internal structure of high-dimensional data and mine low-rank characteristics of the data; secondly, representing enhanced low-rank and sparse characteristics of the constructed radar tensor data by using a tensor low-rank and sparse combined constraint model represented based on a Kronecker basis; and then an optimal solution of the constraint model is efficiently solved in an iteration mode by using an alternating direction multiplier method, and related parameters are updated through a closed-form solution method. According to the method, the superiority of the tensor completion method based on the low-rank and sparse joint constraint in radar high-resolution two-dimensional imaging is verified through comparison experiments on electromagnetic simulation and actually measured radar data.

The invention discloses an outdoor field large depression angle measurement method and system, and the method comprises the steps: S1, determining the position of a measured target, erecting a calibration ball and a positioning ball, determining the flight height of an unmanned plane, and setting a scanning path; s2, establishing a coordinate relationship among the calibration ball, the positioning ball and the unmanned aerial vehicle; s3, testing the calibration ball and the positioning ball in different directions, and acquiring frequency sweeping echo frequency domain data in different directions; s4, removing the calibration ball, and erecting a measured target at the position of the calibration ball; s5, testing the positioning ball and the tested target in different orientations, and acquiring frequency-sweeping echo frequency domain data in different orientations; and S6, performing phase compensation on the measurement data through theoretical values of different distances from the positioning ball to the radar on the measurement path, and obtaining two-dimensional imaging data and an RCS result of the measured target. The method is suitable for outdoor field measurement, target scattering characteristic diagnosis under complex environments such as large depression angle ground and sea can be realized, flexible deployment requirements can be realized, and the test cost is reduced.

The invention provides a synchronous positioning and mapping method for underwater pipeline detection, and belongs to the technical field of underwater robot navigation and positioning. In order to solve the problems of limited illumination, strong echo interference, high structural repeatability and the like in a seawater pipeline environment, the invention provides a factor graph optimization-based tight coupling pose estimation framework fusing a two-dimensional imaging sonar, a Doppler velocity meter DVL and an inertial measurement unit IMU. Through joint constraint and optimization of multi-source sensing information, the method can realize high-precision positioning and continuous mapping of the ROV in an environment with extremely low visibility and a complex pipeline structure, and effectively improves autonomy and data reliability of an underwater inspection process. The method is clear in structure, easy and convenient to implement, high in calculation efficiency, capable of stably running on a conventional ROS platform and suitable for various types of underwater pipeline detection and inspection tasks.

The invention provides a target translation compensation and three-dimensional imaging method and system for a close-range millimeter wave MIMO radar, and the method and system achieve the high-quality real-time three-dimensional imaging. The method comprises the following steps: receiving echo data and movement speed of a tested person, and carrying out phase calibration from multi-station sampling to single-station sampling on the echo data; performing two-dimensional Fourier transform and motion compensation in x and y directions on the echo data after phase calibration based on the motion speed of the tested person; performing two-dimensional inverse Fourier transform on the echo data after two-dimensional Fourier transform and operation compensation in the wave number domain # imgabs0 # and # imgabs1 # directions; performing coherent superposition on the echo data after the two-dimensional inverse Fourier transform to obtain echo data after motion compensation of the tested person; based on a static target three-dimensional imaging algorithm principle, processing the echo data after motion compensation of the tested person to obtain two-dimensional images of each distance direction plane; and performing traversal synthesis processing on the two-dimensional image in each distance direction plane to obtain a three-dimensional image of the tested person.

The invention relates to the technical field of electromagnetic scattering, in particular to a low-scattering processing method and device for a rigid support rotary table. The embodiment of the invention provides a low-scattering processing method for a rigid support rotary table, and the method comprises the steps: carrying out the electromagnetic scattering test of a target disposed on the rigid support rotary table, and obtaining test data; performing one-dimensional / two-dimensional imaging processing on the test data at different angles to obtain strong scattering point distribution data; judging a target position where the strong scattering point data is generated according to an electromagnetic wave propagation path and a target erection height; and arranging a shielding device under the target position to reduce the influence of ground scattering on test data. The embodiment of the invention provides a low-scattering processing method and device for a rigid support rotary table. The influence of ground reflection on measurement data can be reduced.

The invention relates to a terahertz frequency band space target three-dimensional rapid imaging method, device and equipment. The method comprises the following steps: acquiring a two-dimensional ISAR image sequence; based on the two-dimensional ISAR image sequence, constructing a projection relation from a three-dimensional space to a two-dimensional imaging plane; randomly selecting an initial candidate point of the space target, taking the initial candidate point as a starting point, performing first expansion according to a mode of diverging from inside to outside, and generating a plurality of first candidate points; based on the projection relation from the three-dimensional space to the two-dimensional imaging plane, the maximum energy projection criterion is adopted to calculate the projection energy of each first candidate point, a second candidate point with the maximum projection energy is screened out, and the second candidate point is reserved as a real three-dimensional point of the space target; and taking the second candidate point as a starting point, carrying out second expansion according to a mode of diverging from inside to outside until a termination condition is reached, and obtaining a final space target three-dimensional imaging result. According to the invention, three-dimensional imaging can be realized quickly, and the body characteristics of a real target can be reflected better.

A method for modeling a joint before, during, and / or after a medical procedure includes receiving first imaging data capturing the joint from a first imaging perspective and second imaging data capturing the joint from a second imaging perspective that is different than the first imaging perspective, the first and second imaging data generated intraoperatively via a two-dimensional imaging modality, generating three-dimensional image data by back-projecting the first and second imaging data in three-dimensional space in accordance with a relative difference between the first and second imaging perspectives, generating a three-dimensional model of the joint based on processing the three-dimensional image data with a machine learning model trained on imaging data generated via at least a three-dimensional imaging modality, and displaying a visualization based on the three-dimensional model of the joint during the medical procedure.

The invention discloses a phase unwrapping method for an SAR (Synthetic Aperture Radar) interferometric phase diagram. The phase unwrapping method comprises the following steps: acquiring prior information of the interferometric phase diagram; based on prior information, unwrapping the interferometric phase diagram to obtain an absolute phase; elevation information is extracted according to the absolute phase; according to the elevation information, the prior information is reversely optimized. The acquisition of the prior information is based on image segmentation of the interferometric phase diagram. According to the phase unwrapping method for the SAR interferometric phase diagram and the related product, all segmented areas are executed one by one, all reconstruction results are further geocoded and integrated, fine three-dimensional reconstruction of a building can be achieved, target extraction is conducted by fusing structural features in the two-dimensional imaging direction, and the construction efficiency is improved. And the accuracy of building identification is obviously improved. The structure auxiliary information of image segmentation effectively reduces the risk of phase discontinuity in the phase unwrapping process, significantly reduces the unwrapping error, and achieves the high-precision and low-cost three-dimensional reconstruction of a building under the condition of a double-track long baseline.

The invention belongs to the technical field of radar imaging, and particularly relates to a radar sparse three-dimensional imaging and resource scheduling method based on ring array nesting, which comprises the following steps of: establishing a sparse imaging model under an OFDM (Orthogonal Frequency Division Multiplexing) framework; providing a sparse two-dimensional imaging method; proposing a pitch angle reconstruction method based on phase interference; calculating imaging parameters required by resource allocation in the multi-target imaging scene; and establishing an adaptive resource scheduling optimization model and providing a solving method. According to the radar sparse three-dimensional imaging method based on circular ring array nesting, three-dimensional high-resolution imaging is achieved under the condition that a small number of radar resources are consumed. And a self-adaptive resource scheduling algorithm is provided, so that a multi-target imaging self-adaptive resource scheduling model is established by taking time saving, improvement of array element and frequency band utilization rates and balance of radiation intensity of a mode selected by each target as optimization targets, and reasonable allocation of limited radar resources is realized.

The invention discloses an electromagnetic induction imaging device and method based on atomic spin-exchange relaxation-free. A light beam emitted by the light source unit enters the light path adjusting unit after passing through the gas chamber coil unit, a to-be-imaged sample is placed in the gas chamber coil unit, the to-be-imaged sample generates a magnetic field under the action of the gas chamber coil unit, and the magnetic field acts on an atomic gas chamber in the gas chamber coil unit. The light beam sequentially passes through the atomic gas chamber and the light path adjusting unit and then enters the imaging unit, the imaging unit performs electromagnetic induction imaging on a sample and displays the sample, and the atomic gas chamber is filled with alkali metal atoms in a state without spin exchange relaxation. Based on the spin-exchange relaxation-free state of atoms, according to the electromagnetic induction phenomenon of an imaged sample, two-dimensional imaging of the sample is achieved, and magnetic field information obtained through electromagnetic induction of the sample can be extracted from light intensity information obtained after the sample penetrates through the atomic air chamber and combined imaging is achieved.

The invention discloses a discrete imaging method and device for a ground penetrating radar system, terminal equipment and a storage medium, and relates to the technical field of detection radar imaging, and the method comprises the steps: obtaining a plurality of antennas of a common midpoint antenna array, and carrying out the integration and superposition of initial signals collected at different collection points in a detection region, generating a discrete signal of each antenna pair on each acquisition point, and determining the two-way travel time and the inclination factor of a detection target detected by each antenna pair at each acquisition point according to the discrete signal, and carrying out migration integration according to the coordinate position of each acquisition point, the discrete signal of each antenna pair, the two-way travel time of the corresponding detection target and the inclination factor, generating a two-dimensional imaging result of the depth profile of each acquisition point, and finally splicing the two-dimensional imaging results of the acquisition points to obtain the depth profile of the detection target. And generating an underground three-dimensional model of the detection area. Therefore, the problem that the underground imaging result of the existing handheld radar ground penetrating system is not ideal can be effectively solved.

A force sensor assembly for use in the field of cardiac ablation, for the ablation-based treatment of atrial fibrillation and other cardiac arrhythmias. Various embodiments of the disclosure are directed to a catheter distal force sensor for measuring catheter tip-to-endocardial wall force by measuring displacement of irradiation patterns sensed with a two-dimensional imaging sensor. The disclosed devices sense an array of irradiation pattern characteristics, including changes in size and location of irradiation shapes of the irradiation pattern. In some embodiments, multiple irradiation spots are tracked with the two-dimensional imaging sensor to infer the components of a reaction force vector acting the force sensor assembly. The disclosed force is designed to accommodate typical catheter tip dimensions, the outer diameter of these usually being less than or equal to 3 mm.

A medical system includes a manipulator assembly configured to drive a flexible elongate device, and a control system coupled to the manipulator assembly. The control system is configured to receive a three-dimensional (3D) image of a distal portion of the flexible elongate device and a target structure, determine, based on the 3D image, a two-dimensional (2D) imaging plane for viewing movement of the distal portion of the flexible elongate device from a first position captured in the 3D image to a second position that points toward the target structure, receive 2D images in the 2D imaging plane captured over time, and control the manipulator assembly to move the distal portion of the flexible elongate device from the first position to the second position based on the 2D images.

A fundus imaging device has a fixation optical system, an OCT optical system, an imaging optical system, and a controller. The controller is configured to acquire a focus evaluation value based on a slit image formed by slit-shaped illumination light on a two-dimensional imaging element of the imaging optical system in a case where an optical scanner of the imaging optical system deflects in a predetermined direction. The controller is configured to perform diopter correction control of the OCT optical system by driving a first focus adjustment unit of the OCT optical system based on the focus evaluation value.

The present invention provides a high-speed ultra-short-range SAR local BP fast imaging method, which includes constructing a geometric model of a two-dimensional imaging scene and deriving the target scattering point echo signal received by the radar based on the model. The method also includes the following steps: pixel segmentation of the ultra-short-range SAR application scene based on a polar coordinate system; performing frequency modulation processing on the echo signal to obtain the distance R of all targets to the radar when the slow time is zero in the frequency domain. n ; The distance is R n , n∈{1…N}, azimuth direction from θ0 to θ m For a certain pixel in the range, the echo signal amplitude is coherently accumulated in the slow time domain; all azimuth pixels are traversed to obtain the range R n The imaging result is obtained by looping through all target distances using the method in step 3, and obtaining a frame image of the entire scene. The present invention proposes a local BP imaging method based on polar coordinates, which uses the target distance obtained by Fourier transform to narrow the imaging range.

The invention discloses a front downward-looking imaging image processing method and device based on a synthetic aperture radar. The method comprises the following steps: preprocessing an echo signal received by a synthetic aperture radar to obtain low-frequency echo data; performing imaging processing on the low-frequency echo data, applying Doppler sharpening imaging to a front downward-looking imaging scene, and fully utilizing echo information to obtain a target two-dimensional imaging image; and performing image processing on the target two-dimensional imaging image to obtain a target contour image. The time from data acquisition to result generation is greatly shortened, ground processing delay is avoided, the problem that data transmission is interrupted or lost due to the fact that a traditional mode depends on a ground station and a communication link is solved, and the method has more remarkable advantages especially in a complex geographical environment.

A method for performing a series of optical measurements on an activated display, whether or not it has already been mounted in an actual display device, the activated display having an optical characteristic with a performance that changes during and / or between the measurements of the series of optical measurements that are configured as a sequence of measurements comprising a pair of identical 2D image measurements or a pair of identical spot measurements in combination with a 2D image measurement to determine at least one of luminance, color-point and spectral distribution of emitted light, and the distributions of luminance and color-point over the entire light-emitting area of the activated display with an improved accuracy. An optical measurement setup for performing the series of optical measurements in accordance with the method.

The invention discloses a single pixel panoramic imaging (SPPI) method based on a Walsh-Hadamard (W-H) base. The SPPI technology is widely applied to the fields of automatic driving, pipeline detection, low-altitude economy and the like, and according to a traditional scheme, although efficient panoramic perception is achieved through combination of a convex mirror and an imaging algorithm, the algorithm efficiency and precision still need to be optimized. According to the invention, a W-H orthogonal basis optimization panoramic annular modulation mode is introduced, and the SPPI technology is improved on one-dimensional and two-dimensional imaging algorithms. The method mainly comprises the following steps: 1) constructing a two-dimensional orthogonal ring modulation framework by adopting a W-H orthogonal basis to replace a random mode; 2) building a panoramic imaging system based on a passive modulation single-pixel camera; and 3) improving a single-pixel panoramic imaging model based on two-dimensional W-H base orthogonality and a V2DALM algorithm, and optimizing the panoramic imaging adaptation capability of the algorithm. According to the method, the imaging speed and quality are considered, and the optimal SPPI scheme can be selected for different application scene requirements such as high fidelity, high speed and speed-fidelity balance.

The application relates to a moving target constant resolution ISAR imaging method and device based on track information. The method comprises the following steps: obtaining a speed vector of a moving target by processing track information, inputting the speed vector into a pre-constructed extended Kalman filter to obtain an attitude angle of the moving target at each time, converting the attitude angle of the moving target in a three-dimensional space into an actual rotation angle in two-dimensional imaging through a rotation matrix, obtaining an effective rotation angle according to the actual rotation angle, accumulating the effective rotation angles of continuous multiple time points until the accumulated angle meets a preset horizontal resolution threshold, taking the time corresponding to the accumulated angle as an imaging window length, accumulating the effective rotation angles according to the preset horizontal resolution threshold, obtaining multiple imaging window lengths, obtaining multiple target images, and realizing imaging of the moving target. The method has noise stability in the imaging process of the target, and further improves the target imaging quality.

The invention provides a cell activity detection method based on fluorescence labeling, and relates to the technical field of cell analysis. The cell activity detection method based on fluorescence labeling comprises the following steps: S1, co-incubating a cell sample to be detected with a mixed solution of propidium iodide, a JC-1 mitochondrial membrane potential dye, a DCFH-DA active oxygen probe, a Caspase-3 / 7 activated substrate and a Hoechst nuclear dye, completing synchronous multiple labeling, and generating a multi-labeled cell sample, S2, detecting the cell activity based on the multi-labeled cell sample, five-channel full-automatic scanning is carried out through a high-content imaging system, Z-stack images are collected, and a multispectral image data set is generated. The five probes are mixed and incubated at one time through a synchronous multiple labeling process, so that the operation time is remarkably shortened, and the risk of cell injury caused by multiple times of centrifugation is reduced; z-stack full-automatic scanning is combined with three-dimensional image acquisition, the capturing capability of weak fluorescence signals is improved through multi-focal plane fusion, and information loss caused by cell thickness or position offset in traditional two-dimensional imaging is overcome.

Apparatus and associated methods relate to autonomous devices configured to map surface topologies of airfoils of gas turbine engines. The autonomous device moves across the airfoil while remaining coupled thereto while sensing the surface topology of the airfoil using an optical gel sensor via an array of airfoil contacting members. The optical gel sensor includes an optical gel, having nominally planar opposite surfaces defining a nominal gel thickness extending over an image area. A lighting element illuminates the optical gel from an end of the flexible optical gel. A plurality of airfoil contacting members extend between the flexible optical gel and the airfoil, thereby distorting the flexible optical gel in response to changes in the surface topology of the airfoil. A two-dimensional imager images the flexible optical gel over the image area, thereby creating a two-dimensional image that is indicative of the surface topology.

A method for guiding bone removal includes receiving at least one two-dimensional image of bony anatomy captured by a two-dimensional imaging system and at least one endoscopic image of the bony anatomy captured by an endoscopic imager. A three-dimensional model of the bony anatomy is registered with the endoscopic imager in a common reference frame using the two-dimensional image and a tracking system. A position and orientation of the three-dimensional model relative to the endoscopic image is determined based on registration of the three-dimensional model with the endoscopic imager in the common reference frame. The endoscopic image is displayed simultaneously with at least a portion of the three-dimensional model based on the determined position and orientation of the three-dimensional model relative to the endoscopic image.

The application discloses a vortex electromagnetic wave radar forward-looking imaging method and system based on a concentric circular array design, a storage medium and an electronic device, and specifically comprises the following steps: establishing a new system radar imaging model according to a radar working mode; designing a concentric circular array and a vortex mode transmitting function; deriving a return model; obtaining distance direction high-resolution information of a target; performing distance correction, phase decoupling and Bessel amplitude compensation on the azimuth direction of the return, and coherently superimposing the compensated return to reestablish a dual relationship between a mode and an azimuth angle; and finally, realizing vortex electromagnetic wave radar forward-looking two-dimensional imaging through fast Fourier transform on the azimuth direction. The forward-looking imaging can increase the observation time of a region of interest, keep the region of interest in a main lobe range, enhance the strength of a return, increase return information, and effectively improve the azimuth direction resolution.

The present disclosure provides new and innovative systems, methods, and apparatuses for detecting non-decode events in indicia scanning settings. In an example, a system comprises a depth imaging assembly, a 2D imaging assembly, and a processing device, wherein the processing device is configured to attempt to decode an indicium affixed to a first item that is passing through at least one of a field of view of the 2D imaging assembly or a field of view of the depth imaging assembly, determine a first characteristic associated with the first item based on depth data from the depth imaging array, and responsive to a failed attempt to decode the indicium, detect a second item that is passing through the field of view of the 2D imaging assembly and the field of view of the depth imaging assembly, determine a second characteristic associated with the second item based on depth data from the depth imaging assembly, determine if the first item is a same item as the second item based on comparing the first characteristic and the second characteristic, and responsive to determining that the first item and the second item are not the same item, transmit a message to an alert module that is indicative of a non-decode event.

This application relates to adjusting camera exposure for three-dimensional depth sensing and two-dimensional imaging. A method is disclosed, comprising: instructing, by a processing system of a distance sensor, a pattern projector of the distance sensor to project a pattern of light onto an object during a first timing frame; instructing, by the processing system, a camera of the distance sensor to acquire a first image of the object during the first timing frame, wherein the first image is acquired with an exposure time of the camera set to a first value; instructing, by the processing system, the pattern projector to project a pattern of light onto the object during a second timing frame after the first timing frame; instructing, by the processing system, the camera to acquire a second image of the object during the second timing frame, wherein the second image is acquired with the exposure time of the camera set to the first value; instructing, by the processing system, an illumination source of the distance sensor to illuminate the object during a third timing frame after the second timing frame; and instructing, by the processing system, the camera to acquire a third image of the object during the third timing frame, wherein the third image is acquired with the exposure time of the camera set to the first value.