47 results about "Surface projection" patented technology

The invention discloses a tunnel lining crack identification method and system based on panoramic space image splicing, and relates to the technical field of tunnel visual identification. The method comprises the following steps: acquiring a tunnel lining image array, and performing local splicing on tunnel lining images by using a splicing model based on cylindrical surface projection to obtain a local spliced image; fusing and splicing the local spliced images by using the global image space model to obtain a panoramic spliced data graph; and abnormal region detection is carried out on the panoramic splicing data graph according to the spatial local difference, and a tunnel lining crack identification result is obtained. According to the method, the lining panoramic space model based on image two-stage fusion is used for splicing, so that the visual coherence and naturalness of a global spliced image are improved.

The invention relates to the technical field of ultrasonic detection, and discloses an ultrasonic scanning path optimization and three-dimensional reconstruction method, device, equipment and medium, and the method comprises the steps: positioning a key mark point of a target area, generating an initial scanning path, and controlling an ultrasonic probe to move along the initial scanning path to collect first ultrasonic image data, extracting target structure features to construct an initial three-dimensional point cloud model; establishing a surface projection model; fitting to generate a surface profile curve and calculating the tangential direction of a sampling point; optimizing the orientation of an ultrasonic probe based on the tangential direction to generate an optimized scanning path; and reconstructing a final three-dimensional model. According to the invention, through key mark point positioning and incident direction optimization based on the tangential direction, the scanning path of the probe is enabled to be adaptive to curvature change of the target area, and through combination of real-time contact force adjustment and multi-stage image data acquisition, three-dimensional point cloud space coverage and imaging consistency are improved, and high-precision three-dimensional reconstruction of a complex anatomical structure is realized.

The invention relates to an offshore wind turbine tower anticorrosive coating spraying thickness uniformity prediction method and system, and relates to the technical field of coating repair treatment.The method comprises the steps that firstly, a single-point spraying material adhesion amount model of a tower is established according to relevant parameters during spraying so as to reduce single-point prediction errors; then, a spraying track is deeply researched and analyzed, and a discretization technology is utilized to discretize a curved surface corresponding to the surface of the tower drum into grid units; and finally, realizing thickness and uniformity prediction by utilizing a three-dimensional curved surface superposition algorithm, predicting the coating thickness of each grid unit, and determining the total thickness of the coating through accumulated integration, so as to generate a thickness distribution cloud picture. Therefore, the method can accurately quantify the influence of complex geometric features on coating diffusion, predicts the coating thickness distribution of a complex curved surface through the track superposition and curved surface projection technology, achieves accurate uniformity quantitative evaluation, and achieves high-consistency thickness prediction from local to overall.

The invention relates to the technical field of computer aided design, in particular to a neighborhood gradient-oriented large-curvature curved surface projection point calculation method, which comprises the following steps of: S1, calculating a space bounding box of a curved surface to be projected, and performing triangulation to generate a triangular mesh; s2, traversing curved surface control vertexes of the triangular mesh, recording an adjacent vertex set, and judging whether the vertex set is a boundary point or not according to the UV parameter coordinates; s3, storing the vertex information and constructing a BVH tree, traversing the BVH tree for a to-be-projected point, querying and obtaining the nearest vertex with the minimum distance from the to-be-projected point, judging whether the nearest vertex is a boundary point or not, and processing according to a judgment result to obtain an iteration initial value; and S4, constructing a target function by taking the iteration initial value as an initial value, and calculating by using a Newton iteration method to obtain an accurate projection point of the to-be-projected point on the curved surface. The curved surface projection point approximation result calculation method is high in calculation efficiency and robustness, and the influence of curvature, grid division and other factors on Newton iteration input is reduced.

This invention provides an automatic calibration method and apparatus for a ship panoramic surround view system based on UAV collaboration and 3D surface mapping. A virtual 3D surface projection model is established in the ship's coordinate system, and the surface normal vectors of sampling points on this model are mapped outwards to generate the UAV's flight trajectory. The UAV, equipped with an RTK positioning module, acts as a dynamic calibration target with precise three-dimensional coordinates as it flies along this trajectory, its spatial distribution naturally matching the geometry of the surface projection model. During flight, images from the UAV are simultaneously acquired by the ship's onboard camera, and pixel coordinates are extracted using a target detection algorithm. Simultaneously, the time synchronization data between the UAV and the ship's onboard RTK module is used to establish the correspondence between pixel coordinates and three-dimensional coordinates in the ship's coordinate system, minimizing reprojection errors and jointly calculating the extrinsic parameters of each camera. This eliminates the dependence on fixed planar references on shore, enabling automated calibration with precise adaptation to the 3D surface projection model in any water area.

To provide an operation support device and an operation support method that allow a user to easily operate a work device.SOLUTION: A working device 2, which can be operated by a user and includes a contact device 201 that comes into contact with a work object, includes a contact surface projection distance calculation unit 113 that calculates a distance between each part of the contact device 201 and the work object, and a display processing unit 4 that creates a contact surface projection distance image according to the distance value between each part of the contact device 201 and the work object, and outputs the created contact surface projection distance image to the display device 4. In the contact surface projected distance image, one of a color, density, a pattern, and a contour shape is associated with the distance.SELECTED DRAWING: Figure 5

The application discloses a saw blade detection system based on multi-source data fusion, and particularly relates to the technical field of saw blade detection; the saw blade detection system is characterized in that: side surface image data of a saw blade is collected, tooth back surface projection line features and edge geometry features are extracted, initial visual feature data of the saw blade is established; side surface image data is continuously collected in actual processing, side edge projection line features and edge position changes are compared and analyzed, visual wear data is determined; main shaft current data is synchronously collected and current change trends and variability are analyzed, current wear data is determined; normal wear and tooth loss abnormal trends of the saw blade are analyzed based on the visual wear data and the current wear data, visual degradation features and current abnormal features are obtained; visual and current fusion feature data is calculated in combination with product processing unqualified rate, and a saw blade scrapping trigger threshold is established; finally, fusion feature data and the scrapping threshold are compared in real time, so that the saw blade scrapping or replacement time is determined; and the application improves the precision and reliability of saw blade state monitoring.

The application discloses an initialization method of a conic surface under a projection linearization track surface, and belongs to the technical field of calculation, reckoning or counting. The method first obtains a preliminary estimation of a target track through three groups of observation data; determines a conic surface containing an initial track surface according to initial track information and geometric knowledge; estimates the missing height information in combination with the conic surface, and obtains more position information of the target in combination with the existing angle information; projects the position information of the target into a two-dimensional section, re-estimates the track parameters by using a least square algorithm, and more accurate track parameters can be obtained; then the iteration process is repeated by using the newly obtained track information until a certain initial orbit determination accuracy requirement is met. The algorithm firstly fits the height information of the target by using a conic surface coordinate system, and realizes linear fitting of the position vector by using a track surface projection method, so that the calculation amount is small and the accuracy is high.

The invention provides a content shaking behavior detection method and device, electronic equipment and a storage medium, and relates to the technical field of computer vision. The method comprises the following steps: acquiring a real-time sampling signal of a sampling point in a content display period; the real-time sampling signal comprises acceleration data and angular velocity data of a sampling point; according to at least one of the acceleration data or the angular velocity data, determining a basic shaking characteristic; according to the acceleration data, a shaking track is projected to a three-dimensional spherical surface, and spherical surface shaking characteristics are determined according to a spherical surface projection result; and performing violation detection on the content shaking behavior according to the basic shaking characteristics and the spherical shaking characteristics.

The invention discloses a directed distance field particle shape representation processing method, system and platform based on a neural network. According to the core technology principle of the particle mechanical modeling and simulation method based on the neural network coding directed distance field, three-dimensional space coordinates are mapped into directed distance values (SDF) through multi-layer sensor (MLP) neural network learning, and therefore particles in any complex shape are implicitly represented; multi-shape unified modeling and virtual particle generation are realized by introducing a potential coding mechanism, and efficient surface projection and contact detection are realized by adopting a gradient descent and ray search combined method; finally, the trained NetSDF model and a discrete element method (DEM) are seamlessly integrated, and efficient simulation of the large-scale particle system is achieved through acceleration. The method breaks through the limitation of the traditional shape representation method in the aspects of precision, memory and computational efficiency, and provides a brand new solution for computational modeling of the granular material.

The invention relates to a mixed-flow pump guide vane design method and a mixed-flow pump guide vane The mixed-flow pump guide vane design method comprises the following steps: a hydraulic calculation step: performing hydraulic calculation on a mixed-flow pump guide vane axial surface projection drawing according to a mixed-flow pump guide vane design specification; a boundary condition processing step: extracting the circumferential speed, the axial speed and the circular rector distribution in the wingspan direction at the outlet of the impeller, and fitting by adopting an approximate equation as the boundary condition at the inlet of the guide vane; a hub and rim load distribution processing step: adopting a three-section curve formed by parabola-straight line-parabola to control the load distribution at the hub and the rim; processing load distribution at other positions, namely controlling the load distribution at other positions of the blade by adopting a linear interpolation method according to the load distribution at the hub and the rim; and a shaping step: determining the initial shape of the blade, then carrying out iterative calculation, and determining the final shape of the blade. The problem that the performance of the mixed-flow pump is reduced due to the fact that the guide vane is not matched with the impeller is effectively solved.

The application provides a double-curvature fusion curved surface SLAM navigation method, a longitudinal and transverse double-direction curvature parameter is estimated in real time through double-IMU fusion, an extended information filtering framework containing a double-curvature kinematic model, a laser data curved surface projection compensation algorithm and a path double-curvature compensation algorithm are constructed, and the scheme can accurately depict the curved surface geometric constraint where the robot actually locates; the accumulation of the transverse positioning error is inhibited through online estimation and fusion of the transverse curvature parameter; the accurate description and compensation of the robot side slip effect are realized through the establishment of a kinematic model containing a double-curvature coupling term; the data distortion is eliminated and the environment perception accuracy is improved through the projection of the laser scanning data from a plane to the estimated curved surface; finally, the consistency of the control instruction and the curved surface geometry is ensured through the real-time geometric compensation of the planning path based on the double-curvature parameter, and the stability and trajectory tracking accuracy of the control system under the longitudinal and transverse curvature coupling effect are enhanced.

The invention relates to a calibration method suitable for free-form surface projection correction, and belongs to the technical field of projection correction. According to the method, internal parameter calibration and external parameter calibration are realized by adopting two modes of calibrating camera hardware (internal parameter calibration) and determining the posture of a projector relative to a curved screen (external parameter calibration), the two modes can eliminate imaging errors caused by distortion of a lens of the projector, and three-dimensional reconstruction of a projection object and generation of an initial projection image are realized. The method has the outstanding advantages that distortion of projection of the projector on the curved screen can be avoided based on correction calibration of the hardware level, and the method is simple, effective, easy and convenient to implement and good in application and popularization space.

The application discloses an automatic curved surface projection correction splicing method, first, a network camera driving module is run, file mapping technology is used to transmit image information with a main program, then a curtain calibration point is recognized according to a specific color. After that, through an iterative method, in each round of iteration, a core algorithm is used to update distortion parameters according to a projection calibration diagram collected by a camera until a termination condition is reached and then the method is stopped. Finally, according to the distortion parameters obtained through iteration, a final corrected image is obtained. After distortion correction, taking an intermediate channel image as a reference, an iterative splicing correction method is used in left and right channels to complete splicing correction. Finally, in order to eliminate the bright band caused by splicing, color transition is performed on the image. The application does not depend on the accurate position relationship between the camera and the projector, the model can automatically iterate to complete distortion correction and splicing work, and manual participation is not needed, so that the problems of low precision and long time consumption in manual correction are solved, and the application has good correction, splicing and color transition effects.

The invention relates to a surface disinfection system. The surface disinfection system comprises: - a laser beam scanner as a projection device (22, 22'', 22''') with a beam generator (140) for generating a light beam (LBM) and a mirror unit (73) for reflecting the light beam (LBM) and for moving the reflected light beam (LBR) over a predetermined solid angle range; wherein the projection device (22, 22'', 22''') has a light source with a wavelength of less than 475 nm, - a projection surface (21, 21'', 21''') over which the light beam (LBR) emitted by the projection device (22, 22'', 22''') can be moved, and - a computing unit (52) which is designed to control the intensity and illumination time of the light beam emitted by the projection device (22, 22'', 22''').

The present invention introduces an adjustable window frame system designed to address the challenges associated with traditional fixed-size window frames Conventional window frames often require precise measurements and custom manufacturing, leading to complexities during installation, maintenance, and replacement. The adjustable window frame offers a versatile solution by incorporating adjustable components and adhesive features to accommodate a range of window cavity dimensions while ensuring stability, ease of installation, and aesthetic appeal. The system comprises bi-arm brackets (1), sub frame (s) (2), and window profile (3), each equipped with unique features such as surface projections, grooves, adhesive application, and screw retention mechanisms. By providing a flexible and customizable solution, the invention sets a new standard in window frame technology, promoting efficiency, sustainability, and innovation in the construction industry.

The utility model discloses a device with a multi-surface projection function, and belongs to the technical field of multi-surface projection. A support is fixedly installed at the top of a display wall, a sliding groove is formed in the bottom of the support, a sliding block is installed in the sliding groove in a matched mode, and a projector hanging bracket is fixedly connected to the bottom of the sliding block; a first projector is arranged on one side of the support, and a projector hanging bracket is arranged on the other side of the support. The projector hanging bracket is arranged in a hollow mode, a second projector and a third projector are fixedly connected to the two sides of the bottom of the projector hanging bracket, and a fourth projector is arranged in the hollow portion of the projector hanging bracket and fixedly connected with the projector hanging bracket; according to the utility model, the projector hanging bracket can be flexibly moved, the position and angle of the projector can be conveniently adjusted so as to adapt to different display spaces and projection requirements, the projection flexibility is further improved, and the position and direction of a projection picture can be accurately adjusted according to actual conditions.

The invention provides a defect monitoring method, system and device for a high-voltage switch, and the method comprises the steps: collecting image information of target equipment; calling three-dimensional model data of the target equipment, determining corresponding point cloud data information through conversion, and determining weight information of corresponding features according to the point cloud data information; inputting the image information of the target equipment and the weight information of the corresponding features into a preset neural network for combination to obtain a corresponding three-dimensional model neural field; projecting the three-dimensional model neural field to a preset multi-surface projection coordinate surface to obtain picture information corresponding to each angle of the target equipment; and sequentially inputting the picture information corresponding to each angle of the target equipment into a preset defect detection model, and detecting the appearance state of the target equipment to obtain a defect monitoring result. According to the invention, comprehensive and accurate defect monitoring of the high-voltage switchgear is realized, the problem of incomplete coverage of existing routing inspection is solved, and the target defect position and defect content are accurately positioned.

The present invention provides a high dynamic range fringe projection three-dimensional measurement method based on fringe restoration, comprising the following steps: projecting a multi-step grayscale sinusoidal fringe pattern onto a highly reflective surface; dividing the captured image into a reliable area, a light saturation area, and a deep saturation area; calculating the A and B surfaces of the reliable area using the Euler formula method; finding the unsaturated lower intersection point between adjacent fringes to expand F lower The CSI-BSI interpolation method is used to complete the shallow and deep saturation areas of the three surfaces, and based on the relationship between them, the accurate A is calculated for each position. The saturated fringes are then repaired and the phase is further calculated. This invention provides a high-dynamic range fringe projection 3D measurement method based on fringe repair. This method can effectively repair saturated fringes and improve the dynamic range of the system. Using the fringe repair method, the information utilization rate of each image is increased, the number of projection patterns required for high-dynamic range measurement is reduced, and the measurement speed is effectively improved.

The invention belongs to the technical field of underground engineering, and discloses a tunnel fracture rock mass grouting diffusion radius and hole arrangement design method and system.The method comprises the steps that a tunnel fracture three-dimensional model is established within a grouting range, a fracture fitting surface is obtained according to the model, the circle center of the fracture fitting surface is obtained, the circle center is projected on a tunnel face, and fracture surface projection points are obtained; clustering and grouping all the fracture surface projection points, and establishing a minimum coverage circle of each clustering group to obtain the circle center coordinate and radius of the minimum coverage circle; in each minimum covering circle, the relation between the slurry diffusion radius and the grouting hole distribution positions and number is established; iterative optimization is conducted on the grout diffusion radius and the grouting hole distribution number, and the optimal grout diffusion radius and the optimal grouting hole distribution number are obtained. According to the method, subjectivity in a traditional design method is effectively reduced, scientificity and accuracy of a grouting scheme are improved, and therefore the grouting reinforcement effect and economic benefits are improved.

The present application relates to the technical field of geotechnical engineering, in particular to a rock joint roughness measurement method and system. The present application first acquires a triangular mesh of the rock surface; further based on the spatial distribution of the unit outer normal vector in the global coordinate system, and shielding detection is carried out on the local surface element along the shear reverse direction, and the potential contact surface element is screened out; further analyzing each potential contact surface element in the global coordinate system, combining the preset working condition parameters to calculate the friction sliding work; further acquiring the rock mass support thickness, and combining the preset working condition parameters and the shear surface projection area to calculate the root truncation work; further comparing the root truncation work and the friction sliding work, marking the energy consumption mode and constructing the shear energy consumption directed graph, calculating the equivalent shear roughness, solving the problem that the traditional method mistakenly counts the thin ridge protrusions prone to shearing into the roughness under high stress, realizing the stress-sensitive effective roughness measurement.

The application discloses an emergency trauma wound area intelligent measurement and recording system based on deep learning, relates to the field of computer vision, synchronously acquires a two-dimensional image sequence, a six-axis attitude vector and a time stamp, extracts a mask by using a segmentation network, and constructs a local curved surface geometric model in combination with prior parameters; a non-homogeneous weight compensation matrix is generated by calculating the included angle distribution of a space vector and an optical axis vector; target wound physical surface areas are acquired by performing pixel-by-pixel weighted integration on mask pixels based on the matrix, and the shrinkage caused by projection is compensated. According to the weight matrix gradient, confidence is evaluated, and dynamic acquisition guidance or structured data encapsulation is realized. The application effectively corrects non-homogeneous curved surface projection distortion, and improves measurement accuracy and the reliability of clinical records.

The application discloses a depth information repairing method for an RGB-D space of a special-shaped projection surface, a geometric shape change trend of the special-shaped projection surface is presented through a Gray code sequence image, a smooth transition region is divided according to the geometric shape change trend of the special-shaped projection surface, three-dimensional depth information of the smooth transition region is accurately fitted by using a three-dimensional curved surface mathematical model, and basic guarantee is provided for a geometric correction processing process of a subsequent special-shaped projection surface projection display system.

The invention relates to the technical field of centrifugal pumps, in particular to a centrifugal pump blade wrap angle determining method based on hydromechanics numerical integration. The centrifugal pump blade wrap angle determining method is a numerical integration method based on a fluid mechanics equation, equal-interval point division is conducted on a shaft surface streamline in an impeller shaft surface projection drawing through combination of a differential equation and numerical integration, and the arc length and the radius between every two adjacent equal division points are calculated; after the axial surface fluid velocity vm is calculated based on the one-dimensional flow theory, a curve of vm changing along an axial surface streamline is drawn; establishing a linear distribution model of the tangential velocity moment vur according to an Euler equation; after the integral coefficient K is calculated, K.si accumulated integral is calculated point by point, the centrifugal pump blade wrap angle value is directly obtained, and the effectiveness of the centrifugal pump blade wrap angle value is obtained through verification with an example verification method; according to the method, the centrifugal pump blade wrap angle can be designed through parameterization, and the situation that the centrifugal pump blade wrap angle can only be obtained depending on experience is avoided.

The invention relates to the technical field of projection, in particular to a short-focus projection design method and device suitable for a curved surface target and a storage medium. According to the method, a basic system is constructed through optical design, key coordinates are obtained through field point translation and ray tracing in combination with characteristics of a curved surface target, a mapping relation is accurately established by means of a radial basis function, and a pre-distortion image is generated. The method is advantaged in that adaptation to a curved surface target is realized, problems of distortion, non-uniform brightness and the like which are easy to occur in curved surface projection are effectively solved, clear images, no obvious deformation and no extra complex optical elements after projection are guaranteed, rapid deployment can be realized, and short-focus projection can stably output high-quality images on the curved surface.

The present application relates to the technical field of centrifugal pump, in particular to a centrifugal pump blade wrap angle determination method based on fluid mechanics numerical integration. The centrifugal pump blade wrap angle determination method is a numerical integration method based on fluid mechanics equation. By combining differential equation and numerical integration, equidistant points are divided on the axial surface streamline in the axial surface projection diagram, and the arc length and radius between each adjacent two equidistant points are calculated. Based on one-dimensional flow theory, the axial surface fluid velocity v m is calculated m , and a curve changing along the axial surface streamline is drawn. According to Euler equation, a linear distribution model of tangential velocity moment v u r is established. After calculating the integral coefficient K, K·△s i is calculated point by point, and the integral is accumulated to directly obtain the centrifugal pump blade wrap angle value. The effectiveness of the centrifugal pump blade wrap angle value is verified by using an example verification method. The present application can realize the design of the centrifugal pump blade wrap angle through parameterization, and get rid of the condition that the centrifugal pump blade wrap angle can only be obtained by relying on experience.

This invention provides a self-supervised arbitrary-scale point cloud upsampling method and system, including: automatically adjusting the point density of midpoint interpolation using a local geometric feature analysis module to construct an intermediate candidate point set; obtaining interpolation points by controlling the arbitrary-scale upsampling ratio of the intermediate candidate point set through farthest-point sampling technology; introducing an implicit surface projection optimization mechanism, using the interpolation points as seed points for two-stage optimization, and achieving surface projection by estimating the projection direction and projection distance through an implicit neural function; and optimizing the boundary feature representation of the surface projection by generating a two-dimensional projection map through dynamic scaling of the sparse input point cloud based on a pseudo-true value projection comparison mechanism based on point cloud scale transformation. Through adaptive dynamic neighborhood optimization of local geometric features, arbitrary-scale upsampling ratio control, combined with estimation of projection direction and projection distance, and pseudo-true value projection comparison mechanism, the method ensures geometric detail fidelity, point cloud uniformity, and arbitrary-scale generalization ability.

The application discloses a fan regular inspection control method and system of PLC and robot cooperation, which sets an initial threshold value by using an edge computing gateway in combination with PLC macro environment data, collects sensor data and attitude information in real time during robot operation, and executes online quality evaluation. For visual data, a weighted evaluation mechanism based on three-dimensional geometric projection fidelity is particularly introduced, distortion Jacobian graph is used to correct the evaluation deviation caused by surface projection, and the quality score is ensured to truly reflect the observation condition of the physical surface. Based on the quality state mark obtained in real time, action intention is automatically decided and generated, and the motion speed of the robot, the sensor parameter or the micro-correction path is dynamically adjusted. This mechanism enables the inspection system to adaptively respond to environmental changes such as light and surface stains, effectively improving the robustness and data effectiveness of fan automatic inspection.

The invention relates to a physical optical scattered field calculation method based on pixelated projection, and belongs to the field of computational electromagnetics, and the calculation method comprises the steps: obtaining a three-dimensional CAD model of a target, then carrying out the corresponding setting of parameters, and carrying out the curved surface projection of the target, and generating a projection region; pixel discretization and curvature constraint are carried out on the projection area, a radiation function of pixel points is calculated, and a radiation image is constructed. And calculating an oscillation integral of each pixel point through a closed expression, calculating through a GPU parallel architecture to obtain a total scattering field, and outputting the total scattering field. Based on the basic theory of physical optics (PO), the method can ensure high calculation precision on the premise of meeting PO application conditions. Geometric details and surface characteristics of the target can be described in a pixelated projection mode, so that a complex shape, an edge effect and scattering behaviors of a non-uniform material surface are simulated more accurately, and the applicability of the method to an actual engineering target and the reliability of a calculation result are improved.

The invention provides a self-supervised arbitrary scale point cloud up-sampling method and system, and the method comprises the steps: employing a local geometric feature analysis module to automatically adjust the point density of midpoint interpolation, and constructing an intermediate candidate point set; carrying out sampling proportion control on the middle candidate point set at any scale through a farthest point sampling technology to obtain interpolation points; an implicit curved surface projection optimization mechanism is introduced, an interpolation point is used as a seed point to carry out dual-stage optimization, and a projection direction and a projection distance are estimated through an implicit neural function to realize curved surface projection; based on a pseudo-true value projection comparison mechanism of point cloud scale transformation, a two-dimensional projection drawing is generated by dynamically scaling sparse input point cloud, and boundary feature expression of curved surface projection is optimized. Through local geometric feature adaptive dynamic neighborhood optimization and arbitrary scale up-sampling proportion control, in combination with projection direction and projection distance estimation and a pseudo-true value projection comparison mechanism, geometric detail fidelity, point cloud uniformity and arbitrary scale generalization ability are ensured.