44 results about "Virtual coordinate systems" patented technology

The invention discloses an image fusion enhancement method for a multi-signal-source liquid crystal splicing screen, and relates to the technical field of large-screen display control, and the method comprises the steps: building a virtual coordinate system taking a physical gap as a reference at an input end, carrying out the decoding, time synchronization and unified mapping of a multi-source heterogeneous signal, converting the multi-source heterogeneous signal into a unified color space, and carrying out the image fusion enhancement of the multi-signal-source liquid crystal splicing screen. The display consistency of different signal sources is ensured; then, a compensation model based on a brightness attenuation function is introduced into the splicing boundary area, edge pixel brightness is subjected to self-adaptive correction, and brightness unevenness caused by physical gaps is relieved; calculating the content complexity based on the row-level gradient magnitude in the fusion screen area, dynamically constructing a content-sensitive fusion weight, and carrying out weighted fusion on the images on the two sides to generate a transition image frame; and through joint output of the transition image frame and the original side image frame, visual seamless connection of the splicing gap area is realized. Therefore, the integral continuity and visual experience of tiled display are effectively improved while the image detail fidelity is ensured.

A computer-assisted device includes an articulated arm having a plurality of joints including a first joint and a second joint, the articulated arm configured to be coupled to an imaging device and a control unit including one or more hardware processors. The control unit is configured to, when coupled to the articulated arm and a table determine a virtual coordinate frame based on a pose of the imaging device before the first joint is set to a floating mode, configure the first joint to the floating mode, detect movement of the first joint, determine movement of the table based on motion data received from the table, transform the determined movement of the table to the virtual coordinate frame, and drive the second joint based on the movement of the first joint and the determined movement of the table in the virtual coordinate frame.

The invention discloses a multi-screen collaborative display control method and system for a portable computer supporting a spliced screen, and relates to the technical field of display control. Comprising the following steps: setting a current portable computer as main control display equipment; when it is detected that the collaborative display device enters a preset portable computer near field control range, exchanging device identification data of the master control display device and the collaborative display device in real time; the equipment identification data comprises a native display attribute, a display color brightness reference, a display coding and decoding capability matrix and a display space topology seed; performing virtual mapping on the main control display equipment and the collaborative display equipment to obtain a screen display virtual coordinate system; according to the invention, absolute continuity of lines and shapes in logic is ensured; in combination with a compensation mechanism of an edge coupling area, smooth transition processing of brightness and color is performed on adjacent edge pixels, so that a visual blank caused by a physical frame is filled, and a user cannot perceive a physical gap between screens with naked eyes.

The invention relates to the technical field of digital twinning and simulation, and discloses a full-stack digital twinning simulation method and system for a power grid dispatching master station, and the method comprises the steps: obtaining a voltage power flow result data set and a temperature field distribution data set, building a unified virtual coordinate system, building an initial two-dimensional thermal distribution diagram according to an initial mapping matrix, and carrying out the simulation of the voltage power flow result data set and the temperature field distribution data set; carrying out Delaunay triangulation on the image to generate a mapping error distribution diagram; constructing a Markov chain state sequence, calculating a state transition probability matrix, and predicting and generating a corrected mapping matrix; the edge node loads the correction matrix to generate a lightweight state vector, the lightweight state vector is uploaded to the cloud through multi-level cache to form a set, and the cloud updates the matrix and issues a new version; according to the method, the voltage-temperature rise mapping relation is captured, predicted and corrected in real time along with working condition drifting, hidden coupling deviation caused by inconsistent data calibers is restrained, and it is guaranteed that the high-precision and high-consistency electrical-thermodynamic combined situation is always maintained in the operation process of full-stack digital twin simulation.

The invention relates to the technical field of AR remote operation and maintenance, and provides an operation and maintenance system, an operation and maintenance terminal, an expert terminal, a server and a control method thereof, and the operation and maintenance system comprises an operation and maintenance unit which is used for collecting video information and depth data of a physical environment in real time; establishing a mapping relation between the physical environment and the virtual coordinate system according to the video information and the depth data of the physical environment to obtain a physical environment grid and a camera projection matrix; the expert unit is used for intercepting a static frame picture and generating marking information after selecting a marking type; the operation and maintenance unit is used for receiving the marking information and the marking type in real time; converting the labeling information into a camera space ray through the camera projection matrix; calculating a collision point of a camera space ray and the physical environment grid, and determining a three-dimensional space coordinate; and rendering the corresponding three-dimensional marking model in the display field of view of the operation and maintenance unit. The method is used for realizing remote maintenance of IT equipment, mapping expert guidance information to a physical environment and carrying out augmented reality visual display.

A host, a tracking system, and a tracking method are described herein. A storage circuit is configured to store a program code. A processor is coupled to the storage circuit and configured to access the program code to execute: aligning a real coordinate system of a real world with a virtual coordinate system of a virtual world; obtaining a detecting status of a real object in the real world through an object sensor; obtaining a reference status in the real world; in response to a touch action to the real object, comparing the detecting status with the reference status; and in response to a status difference between the detecting status and the reference status being greater than a threshold value, calibrating a virtual object coordinate of the virtual object.

The invention relates to the technical field of product assembly, and discloses a product assembly guiding method and system based on an augmented reality technology, and the method comprises the steps: obtaining a three-dimensional structure model of a product, and carrying out the analysis to generate an assembly animation script; establishing a coordinate conversion relation between a virtual coordinate system and a real coordinate system by identifying anchoring features in a product assembly work site; and projecting the assembly animation into a real scene based on the assembly animation script and the coordinate conversion relationship, and guiding an operator to perform product assembly in combination with an operation interface. According to the invention, the product assembly process is combined with the AR technology, so that the product assembly process can be simply and intuitively presented in front of assembly workers in a step-by-step and step-by-step manner, the operation of each step can be detected in real time, the learning efficiency and the practical operation accuracy of the assembly workers are greatly improved, and the purpose of improving the manufacturing qualification rate is achieved. The method can be used for assembling products such as fuel cells.

This application provides a method, electronic device, and storage medium for object implantation in multi-degree-of-freedom (DOF) video. The method includes: obtaining the coordinates of a real camera matrix in a real-world coordinate system, wherein the real camera matrix is ​​used to capture multi-DOF video; constructing a virtual coordinate system based on the coordinates of the real camera matrix in the real-world coordinate system, wherein the virtual coordinate system is the coordinate system corresponding to the virtual camera matrix in virtual space; mapping the trajectory information of the real camera matrix in the real-world coordinate system to the trajectory information of the virtual camera matrix in the virtual coordinate system; and associating the trajectory information of the virtual camera matrix in the virtual coordinate system with a virtual object to be implanted in the multi-DOF video to obtain implantation information for implanting the multi-DOF video. This application provides a foundation for accurate matching between virtual objects and multi-DOF video.

The application discloses a writing ability evaluation method based on key point detection and related devices, which is used to improve the authenticity and effectiveness of the writing ability evaluation result. The application includes: acquiring a video of a writing area in real time through a camera device, and establishing a virtual coordinate system for a practice book in the video; when a user writes on the practice book using a writing pen, detecting the nib of the writing pen through a CenterNet key point detection algorithm, and tracking the motion trajectory of the nib on the practice book through a deepsort algorithm to obtain trajectory information; generating writing data according to the trajectory information and the coordinate system, wherein the writing data includes a plurality of coordinate points of the nib on the practice book and a plurality of time points corresponding to the plurality of coordinate points; when the user finishes writing, analyzing the writing data to obtain an analysis result; and determining the writing speed of the user according to the analysis result.

The invention provides a multi-level virtual-real coordinate mapping and drift correction method, system and platform, a dynamic floating original point mechanism is established, the original point position of a virtual coordinate system is adjusted in real time, so that a scene around a user is always in a high-precision calculation range of a single-precision floating-point number, and the user experience is improved. The dynamic floating origin mechanism comprises a coordinate mapping engine, an origin decision module and a seamless switching manager. A multi-level real world-virtual-real space-virtual environment conversion link is directly opened, large-scale development of augmented reality XR contents of cities / parks / outdoor / indoor / temporary spaces, automatic driving, unmanned aerial vehicles, intelligent robot navigation and the like is promoted, and the problems of large-space rendering jitter, low development efficiency and the like in the prior art are solved. In order to achieve the purpose, the invention provides an underlying OS operating system, and provides a cross-multi-level real world coordinate system and virtual environment coordinate system mapping method, a drift correction system and a developer operating platform.

The invention provides a dynamic convergence robot knitting track generation method and system, and relates to the technical field of composite material annular knitting and robot track planning, and the method comprises the steps: calculating an equivalent radius, a center line tangent vector and an equivalent half cone angle at each discrete point; establishing a dynamic convergence interval model; calculating an instantaneous convergence distance and an instantaneous traction speed of each discrete point; in the virtual coordinate system, constructing a virtual six-dimensional track containing a virtual position and a virtual attitude; acquiring real calibration coordinates of the center of the knitting machine guide ring in the real world; based on the real calibration coordinates and the initial position of the virtual six-dimensional track, calculating translation vectors and superposing the translation vectors to all virtual positions to determine a real position track; and combining and integrating the real position track, the posture in the virtual six-dimensional track and the instantaneous traction speed to generate a six-dimensional knitting track which can be executed by the robot.

The present invention relates to a computer-implemented method for surgical navigation comprising the following steps: obtaining image data of a patient, the image data having an image coordinate system; obtaining a position of a virtual coordinate system in the image, the virtual coordinate system having a spatial position and a spatial orientation in the image coordinate system; obtaining a spatial position of a patient sensor and a spatial orientation of the patient sensor in a tracker coordinate system, wherein the spatial position and orientation of the sensor are fixed in relation to the patient; obtaining at least a spatial position of a tracked instrument in the tracker coordinate system; and calculating a spatial position of the tracked instrument in the image coordinate system using the spatial position and spatial orientation of the virtual coordinate system and patient sensor.

Reference body and corresponding method for providing a reproducible reference to predetermined reference axes of a virtual coordinate system for fluoroscopic / x-ray imaging comprising a radio dense central marker located at a center of the virtual coordinate system, a plurality of radio dense main satellite markers each located on one of the main axes of the virtual coordinate system, so that a line between the center marker and one of the main satellite markers represent a main axis of the virtual coordinate system for reducing imaging effort and thus duration of the surgery, radiation impact on the patient, while maintaining exactness of the surgery.

The invention discloses a method and a system for lightweight archiving and batch analysis of radiotherapy data, and relates to the field of physics crossing of medical informatics and radiotherapy. The method comprises the following steps: automatically analyzing original radiotherapy DICOM (Digital Imaging and Communications in Medicine) data, stripping high-redundancy CT (Computed Tomography) image data, and only retaining RT Structure and RT Dose files to generate lightweight archived data; reconstructing an independent three-dimensional virtual coordinate system based on the spatial metadata of RT Dose, and executing spatial dimension alignment of a dose grid and a structure contour; establishing a metadata index based on a memory, and constructing a to-be-processed queue according to a preset screening rule; and on the premise that the treatment planning system does not need to be restored, batch DVH reconstruction and parameter calculation are carried out on the lightweight data in the queue by using a mathematical reconstruction algorithm, and a structured analysis report is output. According to the method, the storage cost of radiotherapy historical data is remarkably reduced, and meanwhile, the data extraction efficiency and robustness of large-scale retrospective clinical research are greatly improved.

A host, a tracking system, and a tracking method are described herein. A storage circuit is configured to store a program code. A processor is coupled to the storage circuit and configured to access the program code to execute: aligning a real coordinate system of a real world with a virtual coordinate system of a virtual world; obtaining a detecting status of a real object in the real world through an object sensor; obtaining a reference status in the real world; in response to a touch action to the real object, comparing the detecting status with the reference status; and in response to a status difference between the detecting status and the reference status being greater than a threshold value, calibrating a virtual object coordinate of the virtual object.

The invention relates to the technical field of golf ball position indication, and discloses a golf ball position indication method based on a light source locator, and the method comprises the steps: constructing a real region which is restored to a virtual golf course according to the ratio of 1: N; judging whether the ball falls into a real area according to the coordinate position of the ball stop point through a visual scanning technology; the irradiation angle of the light source positioner is calculated, and the position of the ball is indicated in a real area; the light source positioner is used for distinguishing ball stop points of different players according to light rays with different colors and patterns or light rays with different intensities and different change frequencies projected by different players; and according to the stop point coordinates of the ball, the battledore continues to push and short the rod in the real area. The accurate mapping relation between the virtual coordinate system and the actual coordinate system is established by using the visual scanning technology, the pan-tilt rotation angle of the light source locator is calculated through a vector method or a triangulation method in combination with a space coordinate conversion algorithm, the light source center and the ball stop point coordinate coincide, and the ball position indication accuracy is improved.

The invention relates to an automatic measuring method for processing waveguide cracks, a virtual coordinate system for measurement is established through a mechanical coordinate system, and measurement is carried out on the virtual coordinate system; when displacing from one crack groove to another, the coordinates of the displacement can be quantitatively moved according to a formula, and can also be manually input during processing; during measurement, one point is taken as a reference to measure other points; all measurement actions are continuous. A compensation processing method based on the automatic measuring method is also disclosed, which processes along the route during measurement, generates a compensation value according to the measured value and the required groove depth during processing, and accurately processes the inner point and the outer point. The invention has the advantages of reducing measurement error, improving processing error, reducing labor intensity, improving production efficiency, improving processing quality, and ensuring the stability of processing quality.

The invention relates to a sparse view angle three-dimensional reconstruction pose optimization mode. The method comprises the following steps: inputting a sparse image; constructing an annular virtual coordinate system; performing depth guide pose projection; generating a curvature-color joint mask; performing multi-mode micro rendering optimization; pose output is optimized, physical constraint is achieved, feature dependence is broken through, and a virtual coordinate system achieves zero-overlapping pose multiplexing (SIFT / ORB feature matching is not needed); dynamic interference suppression and curvature-color joint mask are adopted to solve boundary jitter caused by clothes wrinkles; lightweight real-time optimization is achieved, NeRF implicit coding is replaced by multi-mode regularization, and the reasoning speed is increased by 13 times.

The application discloses a nonlinear optimal time of flight control guidance method for intercepting a maneuvering target, and the method comprises the following steps: establishing a nonlinear guidance model in an inertial system and converting to a relative virtual coordinate system; constructing a guidance law basic form which is a sum of a zero-control miss distance control item and a relative flight path error control item; deducing the zero-control miss distance control item based on an optimal control principle to meet a given performance index, determining the relative flight path error control item based on an optimal relative flight path error dynamics equation in an arc length domain, and thus obtaining a nonlinear optimal relative flight path control guidance law; and designing a future average speed prediction algorithm to establish a connection between the relative flight path and the time of flight, so as to realize time of flight control. The application is applied to the fields of aircraft dynamics and guidance and control, can directly design a guidance law for a maneuvering target, and has the advantages of simple form, strong robustness, high feasibility and the like.

This invention belongs to the field of motor control technology. Specifically, it relates to a method and system for smooth speed switching control of an air conditioning compressor based on coordinate transformation. In the low-speed stage, it accurately constructs the electrical angle based on speed integral limiting. Relying on instantaneous switching via coordinate transformation, it achieves instantaneous mapping from the virtual coordinate system to the actual rotor rotation coordinate system of the motor through angle error constraints. Combined with limiting the range of angle deviation, it avoids angle jumps. Simultaneously, after switching, it rapidly performs speed-current dual closed-loop control, effectively suppressing torque pulsation and current surges at the moment of switching, achieving a smooth, shock-free transition from open-loop start-up to closed-loop operation, and ensuring the stable operation of the air conditioning compressor.

The application provides an evaluation method and device for a sensor layout inside a switch cabinet, electronic equipment and a storage medium. The application constructs a virtual coordinate system based on the shell, and determines initial coordinates of each sensor. The position influence score of any target sensor is calculated based on the initial coordinates of each sensor. In the working process of the switch cabinet, the working effect score of the target sensor is determined based on the working data of the target sensor. The initial coordinates are evaluated based on the position influence score and the working effect score. The application quantifies the position influence through the virtual coordinate system, combines data accuracy and environmental bias to give a comprehensive score, overcomes the defects of the prior art which only relies on threshold or networking efficiency, and provides an objective and accurate evaluation method for the sensor layout inside the switch cabinet.

The present application relates to a kind of engine posture control method and engine lifting system.The engine method includes the following steps:S1, the initial positioning of lifting positioner and the displacement sensor arranged thereon, the calibration of displacement sensor is calibrated;S2, engine mounting system and aircraft pylon arrangement calibration block, laser radar scans the position environment of engine mounting system and aircraft pylon, generates corresponding initial three-dimensional point cloud chart;S3, establish virtual coordinate system, calibration engine mounting system and the initial position of aircraft pylon;S4, based on initial position, the lifting path of engine is calculated.The present application proposes a kind of engine posture control method and engine lifting system, can effectively be replaced in wing, can effectively be replaced in wing, improves replacement accuracy and efficiency.

This invention discloses a wind field measurement method and system based on the movement of the sky polarization background. The ingenious approach involves capturing images of a preset area of ​​the sky from multiple angles. Then, the target object in the sky image is located, selected, and its position (within a preset reference or virtual coordinate system) is reconstructed by combining the position information of the image acquisition device. Furthermore, the trajectory is determined by analyzing the positional changes of the target object in different groups of sky images divided according to time points, thereby retrieving the wind field and obtaining further wind field information. This solution facilitates wind field information estimation, reduces equipment requirements, and leverages the computing power of a server to post-process the sky images obtained by the image acquisition device, achieving a high-speed response feedback effect. This provides a new approach and direction for wind field measurement.

The invention relates to the technical field of image processing, in particular to a virtual camera image generation method and device, equipment and a medium. According to the invention, a target point cloud detected by a laser radar is projected to an original coordinate system of an image acquisition device to obtain a sparse depth map; meanwhile, a depth estimation map is obtained based on estimation of the depth of the original image. And fusing the depth estimation map and the sparse depth map to fill the point cloud of the point cloud sparse region on the sparse depth map so as to obtain a dense depth map. The method comprises the following steps: firstly, fusing an original image, then directly projecting the original image to a virtual coordinate system by using a dense depth map obtained by fusion, completing conversion from the original coordinate system to the virtual coordinate system so as to obtain an initial virtual image with relatively high geometric fidelity, and finally, complementing holes in the initial virtual image by using a diffusion model so as to obtain a virtual image without holes. Therefore, the quality of the virtual image is improved.

Embodiments of the present disclosure provide an AR-based remote virtual interaction method, comprising: obtaining an interaction position and interaction content between a first user and virtual content presented at a first device, the virtual content comprising a first rendering of a three-dimensional (3D) model defined within a virtual coordinate system, the interaction position being defined within the virtual coordinate system, the interaction content being obtained through a camera on an AR; generating AR content, the AR content comprising: a second rendering of the model based on a position of a second user within the virtual coordinate system, the position of the second user being based on information obtained by a second device, and a virtual representation of the interaction based on the interaction position; and outputting and presenting the AR content at the second device. Corresponding systems, electronic devices and computer-readable storage media are also provided. The AR-based remote virtual interaction method and system can break through the barrier of "seeing different things" between the two parties of remote interaction, and expand the application range of AR interaction.

The invention provides a method and device for unifying real world and WeChat applet coordinate systems, and belongs to the technical field of augmented reality, and the method comprises the steps: taking a fixed geographic position as a coordinate origin, and building a unified coordinate system; according to the longitude value and the dimension value of the coordinate origin and the longitude value and the dimension value of the position where the mobile phone is located, a conversion coordinate value is obtained through calculation; calculating a conversion angle value according to the angle value; and according to the converted coordinate value and the converted angle value, the virtual coordinate system of the WeChat applet of the mobile phone coincides with the unified coordinate system, so that a virtual object placed in the coincided applet virtual coordinate system can appear at a correct geographic position in the real world. According to the method provided by the invention, the fusion accuracy and stability of the virtual object and the real scene in the WeChat XR applet environment are improved.

A landing platform control method, system, medium, and product for an unmanned transport vehicle are disclosed. The method involves acquiring the vehicle's linear acceleration and angular velocity, as well as the relative position and velocity of the unmanned aerial vehicle (UAV), in the vehicle's coordinate system. A dynamic spatial mapping function, eliminating the influence of inertial forces, is constructed to map the UAV's relative position to a virtual pure inertial coordinate system. A descent trajectory is planned in the virtual coordinate system, and the origin tangential vector is extracted. The physical reference normal vector in the vehicle's coordinate system is obtained through inverse mapping. The dynamic sink rate of the UAV is calculated based on the relative velocity, and the attitude compensation angle is determined accordingly. The physical reference normal vector is then deflected to generate the final landing reference vector. The landing platform is driven to move, ensuring that its surface normal is collinear with the final landing reference vector. This application aims to reduce the risk of attitude instability during dynamic landing of UAVs, improve the smoothness and safety of landing while in motion, and thus enhance the overall operational efficiency of the air-ground cooperative transportation system.

The invention relates to the technical field of traffic environment monitoring, and discloses a traffic flow, vehicle type and noise monitoring system based on image and sound sensors. A multi-modal data acquisition module of the system utilizes a high-frame-rate camera and a directional microphone array to synchronously acquire video streams and voiceprint signals of a road area. The dynamic feature extraction module performs space-time slicing processing on a video stream to generate a motion vector field, extracts a Mel-frequency cepstral coefficient of a voiceprint signal, and constructs a cross-modal feature vector. And the vehicle identity fusion module associates the sequential relationship between the motion vector field and the Mel-frequency cepstral coefficient through a bidirectional long and short time memory network, and outputs a composite feature matrix containing the physical size, the power type and the noise tag of the vehicle. And the three-dimensional scene reconstruction module generates a vehicle three-dimensional point cloud model with noise mapping in a virtual coordinate system according to physical size parameters in the composite feature matrix. According to the invention, cooperative accurate perception and evaluation of traffic flow and noise are realized.

The invention provides a bone tunnel positioning method for knee joint ligament reconstruction surgery. The bone tunnel positioning method for knee joint ligament reconstruction operation comprises the following steps: acquiring a joint medical image of a knee joint; constructing a virtual coordinate system according to the joint medical image; wherein the virtual coordinate system comprises a rectangular bounding box constructed based on a Blumensaat line, the lower edge of the thighbone outer side condylar joint cartilage, the front edge of the intercondylar fossa and the posterior cortical edge; dividing a plurality of quadrants in the rectangular bounding box, and performing bone tunnel key point detection in a target quadrant in the plurality of quadrants to obtain a bone tunnel key point detection result; and generating a knee joint ligament reconstruction planning scheme according to a bone tunnel key point detection result.

The application discloses a double-line laser calibration method and device based on a standard block, and comprises the following steps: 1, transforming the local coordinate system of the double-line laser to the same local coordinate system; 2, transforming the local coordinate system to a virtual coordinate system; wherein, the coordinate system transformation step comprises an angle transformation step and a position transformation step, and the angle and position calibration of the double-line laser measuring instrument is completed through the angle transformation step and the position transformation step. The angle and position calibration of the double-line laser measuring instrument can be completed after one-time scanning of the standard block.