113 results about "Spatial Projection" patented technology

A method tracks non-rigid objects in a video acquired of a cluttered scene by a camera. The method uses a particle filter. The tracking includes the following steps: motion transition estimation, contour deformation detection, and contour regulation. The method uses a dynamic affine transform model and employs the particle filter to estimate the parameters of the model. The method generates a probabilistic map of deformation for tracking the contour of the object followed by a projection step to constrain or regulate the contour in a contour subspace.

The invention discloses an entity relationship prediction method and a prediction system based on knowledge representation learning. The method comprises four modules, namely, knowledge preparation, knowledge representation model construction, knowledge representation model training and entity relationship prediction. The knowledge preparation module completes the data preparation and builds the knowledge map. The knowledge representation model construction module completes the construction of the model, which eliminates the semantic differences among different types of entities through projection operation; the training module of knowledge representation model forms the final knowledge representation model based on the parameters of the iterative training knowledge representation model ofknowledge map. Entity relationship prediction module can predict the possible relationship between any given two entities. The method of the invention predicts entity relationship based on knowledgemap, projects different types of entities to the same semantic space through a spatial projection algorithm, and performs calculation operation, thereby achieving high reliability of prediction results.

The invention discloses a geographic information navigation system based on a visual field of users, which comprises a data center server, a navigation processing module and a mobile client side, wherein the data center server is used for storing control programs of the system and extracting GIS (geographic information system) data from internet or self-stored data according to current GPS (global positioning system) coordinates and displaying to the users and includes GIS data acquisition module, GIS data storage and buffer module and a user module; the navigation processing module is used for collecting orientation data of the users and displaying the collected data according to the GIS data display of the navigation module and includes a user posture acquisition module, a virtual information superposition display module and a navigation module. The system can directly calculate the scenery related information and navigation information in the visual field of the users through spatial projection and overlay and display on the visual field of an equipment screen, so that the users can obtain the information visually and efficiently.

The present invention relates to an axial line correction method of a cylindrical workpiece. According to the method, the spatial relative position of the workpiece under a measurement coordinate system is determined based on the design of the reference point C0 of the end surface of the workpiece; the first correction deltax and deltay of the deviation of a positioning section ZA and a positioning section ZB of the workpiece on an X axis and a Y axis are realized through using two groups of symmetrically-correlated compensation points on the positioning section ZA and the positioning sectionZB of the workpiece; the outlines of the positioning section ZA and the positioning section ZB are resampled, so that sampling points are obtained, a center point O'A and a center point O'B are obtained through fitting calculation; with a straight line determined by the center point O'A and the center point O'B adopted as a reference axis phi of the cylindrical workpiece, a geometric relationshipwith the reference point C0 is built and is solved; and the calibration and correction of a relative deviation angle theta between the reference axis phi and the Z axis of the measurement coordinate system are realized. The present invention also provides a diameter measurement method of the sectioned section of a cylindrical workpiece. According to the diameter measurement method, a geometric relationship between the correction values deltax and deltay of positioning sections and a measured section is built; linear compensation values deltaxi and deltayi are obtained; the coordinates of a probe relative to a sampling point are calculated; integrated and automatic sampling on the outline of the measured section is realized; and a spatial projection and fitting algorithm is adopted to process sampling data to obtain the quantity value of the measured section.

Several unique hardware configurations and methods for freeform optical display systems are disclosed. A freeform display system includes primary freeform optical element(s) and secondary freeform optical element(s) in tiled arrangements to expand the horizontal field of view (FOV) or the vertical field of view. The system may include a variable focusing system that produces intermediate pupil and changes the focal distance of a single focal plane or switches among multiple focal planes for rendering objects in focus while resolving accommodation-convergence conflict. The system may map light samples to appropriate light rays in physical space and use a cluster of projectors to project the mapped light rays to produce the light field of the virtual display content. Methods for making tiled freeform optical display systems and methods for producing virtual content with variable focus freeform optics and rendering light fields are also disclosed.

The invention discloses a self-adaption wave beam forming method of a broadband array under main lobe jamming, and aims at solving the problems of peak displacement, main lope widening and side lope elevating when main lope jamming inhibiting is conducted in the prior art. The method is characterized in that a Capon spectral estimation method is utilized to estimate a main lope jamming direction;main lope jamming components of a signal is eliminated through a blocking matrix; focusing processing is conducted on the signal on which main lope jamming eliminating is conducted, and a covariance matrix of a focus output signal is reconstructed; the reference frequency optimum weight under the constraint condition of constant main lope sub spatial projection is solved; focusing invert transformation is conducted on the reference frequency optimum weight to obtain corresponding weight vectors of each frequency, the signal is weighted, and a wave beam forming output signal of the array is obtained. The method has the advantages that main lope jamming and side lope jamming are effectively inhibited, main lope shape preserving of a directional diagram is achieved, side lope level is reduced, the computation efficiency is improved, and the method can be used for target detecting in a complicated jamming environment.

The present invention discloses a video playing method and device. The video playing method comprises the following steps: obtaining a current playing visual angle by responding to operation instructions of entering a panoramic video application program; determining planar playing frames of a display screen in a spatial projection area corresponding to a panoramic video sphere model according to the current playing visual angle, wherein a connecting line between a central point of each planar playing frame and a sphere center of the sphere model is respectively vertical to each planar playing frame, and the sum of the planar playing frames is equal to the number of video channels; and respectively playing corresponding videos in the planar playing frames according to video data of the video channels corresponding to the planar playing frames. According to the video playing method and device disclosed by the embodiment of the invention, based on panoramic video technologies, the videos can be respectively played in the planar playing frames by determining the plurality of planar playing frames of the display screen in the spatial projection area corresponding to the panoramic video sphere model so as to ensure that multi-channel videos can be simultaneously played under a panoramic environment.

The invention relates to a fast speaker confirming method based on the ordinal number comparison of anchor model spatial projection, firstly making anchor model mapping on the test voice, and then making ordinal number comparison between the mapped test voice and the speaker declared by the test voice. The anchor model mapping: firstly extracting the characteristics of the test voice to obtain an eigenvector sequence, then estimating the probability density of each Gauss mixed model in the anchor model and the background model to obtain a mapped score vector. And the ordinal number comparison arranges the scores in the vector components and compares the score ordinal numbers of the test voice and the declared speaker and calculates Euclidian distance between the ordinal numbers, and finally compares the distance with a threshold value to obtain the final result. The invention has wider safety and adaptivity.

The embodiment of the invention provides a content display method and a mobile terminal. The method comprises the steps that curve information of a flexible screen is detected in real time; a curve two-dimensional table is established according to the curve information; spatial projection transformation is carried out on the flexible screen based on the curve two-dimensional table and hardware parameter information of the flexible screen, and a corrected two-dimensional table is obtained; the content displayed on the flexible screen is corrected according to the corrected two-dimensional table. According to the content display method and the mobile terminal, the display content which looks deformed due to the flexible screen can become smooth through the corrected two-dimensional table, the content displayed on the flexible screen still looks normal even the flexible screen is curved, deformed display is avoided, and the use feeling of a user is improved.

This invention describes a cognitive radio signal processing where interference is mitigated using multiple frequency spatial projection to orthogonalize interference. The method is based on the well-known LMS solution of W=(ATA)−1*d that is computed from received multi antenna and multicarrier signals in a novel way.

The present invention discloses a spatial two-point calibration projection based base coordinate system calibration method of coordinated robot. The method is as below: grouping all robots by minimal calibration unit; establishing a two robot base coordinate system; on both sides of the base standard two robots each department to determining a calibration point respectively at two sides of a connection line of the origins of the base coordinate system of each robot; contacting the end points of the robots in a handshake way at the calibration points to obtain joint angle information; establishing a D-H coordinate system to calculate an end posture matrix, an end RPY angle and coordinates of the two calibration points under the base coordinate system; projecting the robots and the calibration points, calculating three matrices, combining the three matrices to obtain a relative pose transform matrix, and repeating the steps in each of the minimal calibration unit to complete calibration of base coordinate system for coordinated robot. The present invention relies on spatial projection robotic to fully utilize facilities of the robot, and has the advantages of less spatial point calibration, effective reduction of cost, significant reduction of time, efficiency improvement, and wide range of adaption.

An image processing method includes: capturing image data from a sequence of images of a scene from different but repeatable viewpoints; associating captured images with a respective viewpoint identification; tracking a region of interest in the sequence of images; performing an eigenspace projection for the respective images to calculate respective points in the eigenspace projection; and comparing the calculated points to points previously obtained for a reference image for substantially the same viewpoints. A change between a calculated point and a corresponding previously obtained point indicates a change in the image content of the region of interest between the corresponding captured image and the corresponding reference image for a substantially same viewpoint.

Disclosed herein is an apparatus and method for creating spatial augmented reality content, which enable interaction with a user. In the method, a stationary object in a real space in which a user is located is defined, and then a virtual space is generated. A dynamic object in the real space is defined, and the dynamic object is converted into a primitive object. The primitive object is arranged in the virtual space and then spatial augmented content is created. A multimedia object is paired with the primitive object, and then a virtual space object is generated. Interaction between the virtual space object and a gesture of the user is defined in a format of event script. The virtual space object and the interaction are packaged in the spatial augmented content and packaged results are provided to the user.

The invention discloses an immersive virtual reality screen projection system, which includes a projection screen and projection equipment. The projection screen includes a top screen, a vertical screen and a ground screen sequentially connected from top to bottom, and the top screen, vertical screen and ground screen are jointly formed. A three-dimensional viewing space, the projection equipment includes a first projection group, a second projection group and a third projection group, the first projection group includes the first projector projected on the floor screen, and the second projection group includes the first Two projectors, the third projection group includes a third projector projecting on the ceiling. In the present invention, the top screen, the vertical screen and the ground screen are connected as an integrated screen, and the screen is bent or bent as a whole to form a three-dimensional and grand viewing space, and each area on the projection screen is correspondingly equipped with a corresponding The projection group is used to form a balanced and complete projection picture. When the audience walks or stands on the ground, they are surrounded by images, so that the audience has a strong sense of presence and immersion, effectively improving the audience's viewing experience.

This disclosure is directed to techniques for estimating signal-to-noise ratio (SNR) of signals received by a wireless communication device. The techniques take advantage of spatial receive diversity in a wireless communication device to achieve accurate estimates of SNR. In general, a spatial projection wiener filter function can be applied to incoming symbol estimates to support efficient computation of SNR. The estimated SNR can be used to produce power control commands for use in forward power control.

The invention discloses a frequency domain optical field digital refocusing algorithm capable of suppressing resampling error, and belongs to the field of optical field image calculation, which solvesthe problem that the existing frequency domain digital refocusing technology causes resampling error in frequency domain data resampling and generates artifacts in the reconstructed image. The specific steps are as follows: At first, that 4D light field is transform into spatial coordinates according to the refocusing depth, Then the center slice in the horizontal direction is taken from the Fourier spectrum, and the refocusing image is obtained by 2D inverse Fourier transform of the central slice. The algorithm avoids the error of discrete data resampling caused by the frequency coordinate transform effectively through the spatial coordinate transformation of the original 4D light field. Compared with the traditional light field digital refocusing method based on the Fourier projection slice theorem, the algorithm of the invention requires fewer operation steps and has lower computational complexity. At the same time, it can achieve the same refocusing effect as the most robust spatial projection integral digital refocusing algorithm.

The invention provides a method for monitoring vibration and strain of a key position of a cutter head system of a full-section rock tunneling machine, and belongs to the technical field of real-timemonitoring of underground construction of the full-section rock tunneling machine. When the TBM cutter head system is used for arranging measuring points at key positions, the vibration and deformation of the TBM cutter head system can be monitored in real time due to the fact that the measuring points are difficult to arrange due to severe external environment and internal complex structures at certain positions, such as internal rib plates, middle panels and the like, therefore, the vibration and strain states in the running process can be monitored through the wireless sensors and the strain gauges arranged at some positions of the TBM cutter head system, simultaneously the vibration and strain data are received and transmitted based on the wireless network protocol, and the reasonableprediction of vibration and strain at other positions can be achieved on the basis of the measured data through the proposed spatial projection prediction model.

The invention relates to an artificial intelligence technology, the invention discloses a vehicle risk prediction method. The method includes: based on a pre-constructed feature extraction method, extracting vehicle feature points from the vehicle driving picture set to obtain a vehicle feature set; calculating optical flow information of the vehicle feature set to obtain an optical flow information set, extracting a characteristic track of the vehicle from the optical flow information set, collecting the characteristic tracks to obtain a characteristic two-dimensional track set; and performing spatial projection on the feature two-dimensional trajectory set to obtain a feature three-dimensional trajectory set, constructing a clustering matrix according to the feature three-dimensional trajectory set, performing inter-class combination on the clustering matrix to obtain a combination matrix, calculating a numerical value in the combination matrix to obtain a driving speed, and calculating a vehicle risk coefficient according to the driving speed. The invention further provides a vehicle risk prediction device, electronic equipment and a computer readable storage medium. The methodcan meet the requirements of real-time detection of the vehicle, and improves the judgment of the risk of the vehicle.

A method for simulating the positioning of at least one acoustic linear antenna towed in a study zone is provided. The method includes at least one simulation step of at least one future position of at least one point of the acoustic linear antenna(e), at least one step for predicting the temporal and spatial variations of at least one marine current likely to interact with the acoustic linear antenna(e) and at least one step for determining the form of the acoustic linear antenna(e) by the resolution of a hydrodynamic model. The prediction step(s) include an upstream phase for determining a current at at least two determined points of the zone; a simulation phase of at least one future position of the determined points; a temporal projection phase of the current determined during the upstream phase at each future position; and a spatial projection phase of the currents at at least two distinct points of the acoustic linear antenna(e) occupying future position(s) of the simulation step.

The present invention relates to the adjustment of movable X-ray imaging systems. In order to provide a facilitated alignment and positioning for a movable X-ray imaging system with reduced hardware requirements and allowing an intuitive operation, a movable X-ray imaging system (10) for aligning an object of interest and an X-ray imaging arrangement in relation to each other is provided. The system comprises an X-ray imaging arrangement (12) with an X-ray source (14) and an X-ray detector (16), at least one camera (18), a data processor (20), and a display (22). The at least one camera i) is either attached to the X-ray imaging arrangement or ii) is attachable to the object of interest. The at least one camera is configured to provide a first image of at least one reference point. The data processor is configured to relate the first image to first projection parameters of a first X-ray image of the object of interest in relation to the object. The projection parameters relate to different degrees of freedom and comprise at least one of the group of spatial projection position, distance to the object, viewing direction or projection angle, and viewing field. For an acquisition of at least one further X-ray image in a projection coincident with the first projection parameters of the first X-ray image, the display is configured to display at least a graphical representation of the at least one reference point in the first image at least partly overlaid with an actual image provided by the at least one camera to guide an alignment movement of the X-ray source and / or the X-ray detector and the object in relation to each other after an intermediate displacement.

A projection display apparatus comprising: a housing member that accommodates an illumination optical unit; a projection optical unit; and a cooling unit, wherein the housing member includes a layout space in a virtually columnar shape having a bottom that is a circumscribed circle of the projection optical unit in a cross sectional view vertical to the projection optical unit; the layout space includes a first layout space in a substantially conical shape and a second layout space excluding the first layout space; the projection optical unit is provided in the first layout space; and at least a part of the illumination optical unit and the cooling unit is provided in the second layout space; and the illumination optical unit and the cooling unit are disposed in a symmetrical positional relationship with respect to the projection optical unit.

The invention relates to a skull sex determining method based on spatial analysis. The method comprises the following steps: carrying out data standardization on skull data of a training sample; carrying out sub-spatial analysis on a standardized training sample data set so as to obtain a sub-spatial projection matrix; projecting the training sample to a low dimensional sub-space from a high dimensional original feature space, wherein a classifier is designed in the low dimensional sub-space; projecting standardized unknown skull data to the low dimensional sub-space by using a sub-spatial projection matrix obtained from the training; and classifying in the low dimensional sub-space by using the designed classifier. With the adoption of the method, complex manual measurement or expert knowledge is not needed, and the accuracy can be more than 94%, so that the method has important application values in criminal investigation fields.

Various technologies pertaining to shared spatial augmented reality (SSAR) are described. Sensor units in a room output sensor signals that are indicative of positions of two or more users in the room and gaze directions of the two or more users. Views of at least one virtual object are computed separately for each of the two or more users, and projectors project such views in the room. The projected views cause the two or more users to simultaneously perceive the virtual object in space.

A real-time generation method for a 360 degree VR panoramic graphic image is provided. The method includes: determining a current camera location and scenario information; rendering a three-dimensional graphic image in a scene photographed by the camera onto a space projection object in real time, and performing combined rendering and capturing and combination to form a fully surrounding panoramic CUBE texture map; in a viewing angle range of 360 degrees, performing spherical projection and second rendering on the texture of the panoramic CUBE texture map, and converting same into a rendered object to generate a panoramic scenario map; and outputting the generated panoramic scenario map via a video IO card to obtain a 360 degree VR panoramic graphic image with a key signal. In addition, also provided is a real-time generation method for a 360-degree VR panoramic graphic image video.

The invention provides a method for merging resolutions of linear array three-dimensional imaging synthetic aperture radars. The method adopts two linear array three-dimensional imaging synthetic aperture radars of which the motion trails are orthogonal to image the same region and then adopts an orthogonal spatial projection matrix technology to merge two obtained images, thereby generating a high-resolution linear array three-dimensional imaging synthetic aperture radar image. The method solves the problem that the cross track resolution of the linear array three-dimensional imaging synthetic aperture radar image is lower than the long track resolution of the linear array three-dimensional imaging synthetic aperture radar image. The method has the advantages of realizing the linear array three-dimensional imaging synthetic aperture radar high-resolution imaging by using a short array antenna and can be used in the fields of synthetic aperture radar imaging, earth remote sensing and the like.

The invention relates to a method and a system for generating CAD (computer-aided design) data models by means of deformation. The method includes processing an existing CAD data model in a discrete manner to form spatial point cloud data; generating a control module comprising hexahedral mesh units according to requirements on designed deformation of a mechanical component; connecting the control module with the spatial point cloud data to form a linkage relation; changing the control module in modes such as spatial projection, stretching, scaling and twist transformation according to design requirements, and allowing the linked initial spatial discrete point cloud data to correspondingly deform along with the control module to obtain deformed spatial point cloud data; fitting the deformed discrete spatial point cloud data to regenerate deformed continuous dots, lines and planes and enabling deformed and refit dot, line and plane data to have continuous function relations identical to continuous function relations of the original CAD data model. The method and the system have the advantages that the data of the original CAD data model can quickly and efficiently deform according to the design objective requirements, so that data of an objective CAD data model can be obtained, the design cycle is shortened, and the design cost is saved.

The invention provides a method for establishing a ship collision avoidance model based on non-Euclidean conformal transformation. Eyeballs of a driver on duty are used as a research basis of lookoutobservation under a real condition; a spherical model is established on the ship by using a Riemannian spherical theory, one-to-one corresponding projection points are found on the spherical surface by using a spatial projection mode for all information in the plane where the ship is located, and the motion trail of the ship can correspond to an arc on the spherical surface by using the method soas to be more in line with the perception of human vision on risks. The research on the collision risk of the ship in the three-dimensional space situation can effectively reflect the relative speed and the relative distance of the ship under the real condition, and a ship operator on duty can effectively perceive the collision risk of the ship. According to the method, spherical surface mapping of a non-Euclidean space is carried out through projection transformation to carry out modeling, the method for calculating the relative speed and the relative distance of the two ships meeting the risk perception better is provided, and technical support is provided for drivers on duty to carry out correct collision avoidance decisions.

The invention provides an airborne multichannel circular SAR moving target detection and estimation method. The method comprises the following steps: preprocessing an original echo signal; projecting the multi-channel echo signal to a noise subspace by utilizing subspace projection in an original data domain, and performing clutter suppression; positioning the geographic space of the image in the absolute geographic space coordinate system, and constructing a model for back projection imaging; using the two-dimensional motion characteristics of the moving target and a backward projection algorithm for point-by-point pulse-by-pulse coherent accumulation imaging, compensating the aircraft motion error, the azimuth space-variant error and the error caused by the two-dimensional motion of the moving target, and directly outputting the imaging result to a digital orthoimage map in a geographic reference coordinate system; forming a steering vector by using a phase difference generated by a moving target between SAR images of different channels, performing coherent superposition on the SAR images of the multiple channels, and improving the signal-to-noise ratio of the target; and performing moving target detection on the synthesized SAR image, and estimating two-dimensional motion parameters of the target.

An image synthesis system is disclosed for synthesizing a global shutter image based on a rolling shutter image. The rolling shutter image is captured by an aerial camera system having at least one rolling shutter camera and the rolling shutter image has a plurality of scanlines, the scanlines having associated different position and pose information. The image synthesis system is arranged to project a rolling shutter image captured by a rolling shutter camera to object space by projecting each scanline of the rolling shutter image using position and pose information associated with the scanline, and subsequently from object space to a synthetic global shutter image.

The invention discloses an ultra-low power consumption visual calculation heart rate and heart rate variability method. The invention relates to the technical field of physiological information extraction. The method comprises the following steps: taking a visible light image or a near-infrared image as an input source; an input source acquires an RAW original image through a CMOS; iSP image optimization processing, image scaling and clipping, PCN face retrieval, target tracking, region mask definition and color space projection are carried out, normalization processing is carried out after Gaussian filtering, Butterworth filtering and trend filtering processing, filtering is carried out through a median filter, and heart rate index drawing is obtained through spectral analysis pulse wavedescription and video output; on the basis of ARMv7a, no DSP or neural network acceleration unit is provided, and a low-cost edge calculation unit is formed; band-pass filtering parameters can meet the requirement for heart rate and heart rate variability collection of all ages without calibration; the method has good resistance to ambient light and motion interference, and is suitable for visiblelight and infrared monochromatic images.