178 results about "Spherical space" patented technology

The invention provides a technical scheme, in particular an involute straight tooth cone gear trimming method. The method comprises the following steps of: determining a tooth trimming position, a trimming quantity and a tooth profile quantity; solving for a spherical space involute Decare coordinate equation; generating a spherical involute in three-dimensional modeling software, forming a spherical involute plane through curve filling, and realizing straight tooth cone gear solid modeling on the basis of the spherical involute; forming a tooth trimming profile on the central cross section of the gear, and isometrically stretching the profile to the tooth surface to realize tooth isometric trimming; carrying out tooth top arc trimming on the tooth profile; and converting a trimming gear model into a digital control code imported into a digital control machine tool to realize the processing of the trimming cone gear. The invention better controls the stress distribution of the gear through controlling the position and the trimming quantity of the isometric trimming so as to compensate the deformation of the gear and reduces the sensitivity of a cone gear pair to errors and load changes as well as improves the transmission precision of the cone gear pair, reduces the vibration and the noise and prolongs the service life of the gear.

The invention discloses a three-degree-of-freedom spherical space robot wrist and relates to a robot wrist. The three-degree-of-freedom spherical space robot wrist solves the problems of complex structure, low integrated level, large own weight and coupling motion of the three-degree-of-freedom robot wrist. In the three-degree-of-freedom spherical space robot wrist, an upper semisphere shaft is rotationally connected with an interface of an end effector; an upper semisphere is rotationally connected with a lower semisphere; the contact surface of the upper semisphere and the lower semisphere is an offset inclined plane; the angle between the offset inclined plane and the horizontal plane is 10 to 25 degrees; an upper semisphere motor and a speed reducing mechanism are fixedly connected with a universal joint shaft through an upper semisphere gear transmission mechanism; the universal joint shaft is fixedly connected with the upper semisphere shaft through an internal universal joint; the upper semisphere shaft is rotationally connected with the interface of the end effector; a lower semisphere motor and the speed reducing mechanism are fixedly connected with a lower semisphere shaft through a lower semisphere gear transmission mechanism; a rotation motor and the speed reducing mechanism are fixedly connected with a turnplate through a rotation gear transmission mechanism; and the turnplate is in transmission connection with the interface of the end effector through an external universal joint. The three-degree-of-freedom spherical space robot wrist is applied to aerospace robots.

Techniques and systems are provided for processing video data. In one example, a media file associated with 360-degree video data can be obtained. The 360-degree video data may include a spherical representation of a scene. The media file may include first signaling information and second signaling information of a viewport region corresponding to a region of interest (ROI) in the spherical representation. The first signaling information may include a center position and a dimension of the viewport region measured in a spherical space associated with the spherical representation. The second signaling information may indicate a region of a picture comprising the viewport region, the picture being formed by projecting the spherical representation including the ROI onto a plane. Pixels corresponding to the viewport region from the data of the picture can be extracted based on the first signaling information and second signaling information, and can be provided for rendering.

The present invention discloses method of creating complete spherical panorama based on six drum shaped image frames. The method includes the following steps: the first establishing of three-dimensional spherical space model; taking six drum shaped image frames in specific requirement; the subsequent determining of image frame adjacency relations and optimal point pair set between adjacent image frames; establishing and solving the optimizing equations based on the optimal point pair set; and finally creating the panorama. The present invention can solves the problem of automatically splicing drum shaped image frames and the problem of incomplete top and bottom information to create complete spherical panorama fast.

The present disclosure provides a technique of text categorization to simplify and optimize the classification. In one aspect, a method parses a given text into one or more words; determines a word vector in a spherical space model for one of the one or more words, a number of dimensions of the spherical space being equal to a number of categories, each category corresponding to a spherical space category vector; for each category, determines a distance between a sum of word vectors of the one or more words and the respective category vector; and classifies the text into one or more categories with the shortest distance. The present disclosure also provides an apparatus used to implement the method.

The invention discloses a spherical space division-based coronary artery automatic segmentation and anatomic marking method. The method comprises the following steps of (1) performing image preprocessing: obtaining a coronary artery segmentation image and a central line; (2) performing a pruning operation; (3) defining a spherical center and a spherical space; (4) executing a division rule of left and right coronary arteries; (5) executing a left coronary artery anatomic naming algorithm; and (6) executing a right coronary artery anatomic naming algorithm. According to the method, a spherical coordinate system is established by taking a vessel divergence point as the spherical center through utilizing characteristics of a heart-shaped inverted cone, and the blood vessel is located and dissected in the spherical space according to anatomic shapes of branch segments of the coronary arteries and a geometric structure relationship among the anatomic shapes, so that the purposes of automatic segmentation and anatomic marking are achieved; the problems of relatively long calculation time, relatively high algorithm complexity and inaccurate branch matching caused by incapability of exhausting coronary artery distribution types in an existing coronary artery automatic segmentation and anatomic marking method are solved; and compared with a method for matching the extracted blood vessel with a prior model, the spherical space division-based coronary artery automatic segmentation and anatomic marking method has the advantages that the time is shortened, the marking is accurate, and more segments can be identified and marked.

Described herein is an unmanned aerial vehicle (“UAV”) apparatus comprising a 360-degree camera system mounted onboard a UAV platform. The camera system comprises a pair of cameras with a pair of wide-angle lenses that have a collective angle of view equal to or greater than 360 degrees, and as such, the lenses can capture images of the entire 360-degree spherical space surrounding the apparatus, except for an exclusive region defined by an overlap radius. The overlap radius is calculated using the equation R=H/[tan(α−180 degrees)+tan(β−180 degrees)], wherein α and β are the respective angles of view of the lenses, and H is the vertical distance between the lenses. The UAV platform comprises a body with a symmetric appearance and a retractable landing gear that can retract within the body during flight and extend out at landing.

The invention provides a moving target automatic tracking method and device for improving user experience. The method comprises the steps that after the moving target real contour in an image is obtained, whether a moving target is at the center in the image is judged; if not, the rotating speeds of a camera lens in the longitude direction and the latitude direction of a spherical space are computed respectively; according to the rotating speeds obtained by computing, the camera lens is controlled to rotate; after the moving target is in the middle of the image by rotating of the camera lens, according to the real contour of the moving target, the circumscribed rectangle of the real contour is obtained, and according to the circumscribed rectangle, camera lens zooming multiplying power is computed; and according to the camera lens zooming multiplying power obtained by computing, the camera lens is controlled to display the moving target in a zooming mode. Rotating and zooming of the camera lens are controlled according to the real contour of the moving target, so that the moving target is displayed at the center in a proper proportion, good displaying effect is achieved, and user experience is improved.

A method for predicting location of the sun in an image space. The method includes providing a set of calibration images and offline intrinsic calibration of a camera and optical element. An extrinsic parameter calibration is then performed based on the calibration images and mapping between local three dimensional coordinates and real world three dimensional coordinates to provide an extrinsic projection matrix. The method also includes providing a real time image of the sky and determining sun location in spherical space based on the extrinsic projection matrix and a real time sun location in the world coordinate system for the real time image. A three dimensional vector is then mapped to provide a corrected two dimensional ideal point. Next, an inverse affine transformation is performed to provide a two dimensional real image point in image space.

The invention discloses a numerical-control processing method of a multi-space hole welding groove on a large-scale spherical space curved surface, comprising the following steps of: establishing a mathematical model of a workpiece; analyzing the mathematical model; compiling a space curved surface numerical-control processing procedure of a basic hole with a common parameter; compiling an after-compensation R parameter procedure of a rotary compound angle; compiling a general parameter numerical-control processing procedure of a R parameter processing space hole groove; applying simulation software of a VERICUT numerical-control machine tool to carry out verification; and executing the general procedures to process space holes and the groove. In the invention, because the R parameter form of a universal angle cutter head for compensation is calculated by the R parameter function of a control system of the numerical-control processing machine tool, and the processing of the welding groove is also compiled in a parameter form, the value assignment is performed according to the positions, the shapes and the sizes of the grooves of the space holes, the length of actually measured angle cutter head and the length of a cutter on a drawing so that the purpose that the grooves of multiple space holes are clamped once for processing is realized, and the shape precision of the space holes is ensured.

In a method for measuring a radiation power, an elliptical mirror is prepared so as to have a elliptical spherical space enclosed by a metal wall surface, the space having a rotating axis passing through two focal points. A device under test is placed in a position of one of the two focal points such that a center of radiation of a radio wave substantially coincides with the focal point, and a receiving antenna is placed in an position of an other one of the two focal points. The device under test is caused to radiate a radio wave and the radiated radio wave is reflected at the wall surface to allow the receiving antenna to receive the radio wave. Then, total radiation power of the radio wave is measured at a measurement end of the receiving antenna in accordance with an output signal from the receiving antenna.

The present invention discloses a rapid online detection apparatus and a detection method for water body bacterial microorganisms. According to the present invention, based on optical scattering and absorption characteristics of bacterial microorganisms, a double-wavelength laser diode is adopted as a light source, an optical fiber array distributed in a spherical space is adopted as an optical signal receiving device, and CCD is adopted as an optical signal detector to research rapid online detection methods and systems for bacterial microorganisms in environmental water bodies, wherein a set of rapid online detection sample machine for water body bacterial microorganisms is developed, and rapid recognition detection on water body bacterial microorganisms is effectively achieved in the laboratory; and the method has characteristics of simple operation, no requirement of sample culture and pretreatment, rapid detection and high sensitivity, can be provided for achieving continuous, online and real time monitoring and classification of bacterial and microorganisms in the water body, and is suitable for rapid online detection of bacterial microorganisms in the nature water body, and complete and continuous monitoring pre-warning of bacterial microorganisms in the drinking water source water body.

The invention discloses a theater with portable stages. The theater with the portable stages comprises a theater body internally provided with a spherical space, a video screen and one or more portable stages, wherein the video screen is arranged on the inner surface of the theater body, used for displaying videos and provided with one or more performing windows, and the portable stages are arranged on the theater body, stretch into the spherical space from the performing windows, comprise telescopic performing stages stretching into the spherical space from the performing windows and are used for carrying actors to conduct live performances. The theater with the portable stages is simple in structure and convenient to install, when audience watch the videos on the video screen, actors can be carried to conduct live performances so that the audience can interact with the actors, in this way, the interestingness of video watching of the audience is improved, the audience can have the immersive feeling, and the vision shock power is larger.

The invention relates to a tumble-flow accelerating combustion chamber. The combustion chamber in an opposed-piston, internal-combustion engine is disclosed in which the pistons tops are designed so that when they approach each other, they induce a tumble flow in one or two spherical spaces defined in the piston tops. The combustion chamber further includes injectors side mounted in the cylinder wall. In one embodiment, the tumble flows in the two spaces are in the same direction and in another embodiment, in opposite directions. In yet another embodiment, there is only one injector and one hemisphere in which a tumble flow is induced.

The invention discloses a digital twin city space coordinate system implementation method based on an unreal engine, and the method comprises the steps: mapping the spherical coordinate data of a newly constructed equilateral triangle coverage area into a plane space coordinate system of the unreal engine through an equilateral triangle in a coverage range of a spherical space system; and the spherical space system being completely covered by the constructed equilateral triangle. By means of the coordinate system implementation method, a traditional gis spherical system can be mapped to a plane space coordinate system based on an unreal engine through a triangular section algorithm, and correct positioning of the spherical coordinate system can be achieved in the digital twin city technology of the unreal engine; the coordinate system established by adopting the method is rapid and variable in precision, and the precision can be changed at will according to different technical applications.

A spine feature point automatic recognizing method based on average curvature flow includes the steps of firstly, conducting three-dimensional reconstructing on a CT image of a human spine to obtain a three-dimensional spine model of to-be-marked feature points; secondly, conducting meshing on the spine model obtained in the first step; thirdly, manually selecting a certain point on the model, and calculating the average curvature value of all vertexes in the spherical space, with infinitesimal radius R, around the manually-selected point; finally, selecting n points, with the maximum average curvature, around the manually-selected point, and obtaining inner products between the n points with the maximum average curvature and the selected point respectively to obtain the point with the minimum included angle. The marking precision of the feature points can be improved, and therefore data measurement precision is improved, and the method has the advantages of being high in precision and easy to implement.

A pointing device for real-time pointing the dish of a dish antenna (1), in particular a marine dish antenna, to be housed within a radome (21). The antenna comprises a dish (3) and a dish position adjusting means that achieves adjusting motions about an azimuth axis (6), an elevation axis (7) and a skew axis (8), the axes (6,7,8) having a minimum distance from a reference point (12), preferably the centre point (13) of a domed portion (22) of radome (21), wherein the reference point (12) is located closer to the front side (14) of the dish than to the rear side (15) of it, and wherein the dish position adjusting means comprises a driving actuating portion (27) integral to the support (2) and a driven actuating portion (28) integral to the dish (3) are provided which cooperate with each other to actuate the rotation about the skew axis (8), the driven actuating portion (28) extending within the profile of the dish (3). This way, the adjusting motions are carried out defining a substantially spherical space portion (26), whereby it is possible to house the dish antenna (1), in particular a Cassegrain type dish antenna, in radome whose diameter is smaller with respect to radome-housed dish antennas that are equipped with prior art pointing devices.

The invention discloses a theater with a multi-dimension moving auditorium. The theater comprises a theater body internally provided with a spherical space, a grid top, a base, a rotatable rotating shaft arranged between the base and the grid top, and the nacelle-type auditorium arranged on the outer wall of the rotating shaft, wherein the a moving device enabling the nacelle-type auditorium to move vertically is arranged on the rotating shaft, the micelle-type auditorium is provided with a nacelle and a swing device enabling the nacelle to swing, and a video screen used for displaying videos is arranged on the inner wall of the theater body. According to the theater with the multi-dimension moving auditorium, the nacelle-type auditorium is arranged inside and can swing front and back and left and right, move vertically along the rotating shaft and rotate along with the rotating shaft so that the audience in the nacelle-type auditorium can watch the content of spherical videos in multiple angles and be free from the constraint of plane vision, the sense of presence and the reality of watching are enhanced, the audience can have the immersive feeling, and the shock power brought by watching the videos is larger.

The invention relates to a spherical large particle size recycled aggregate preparation device and method. The spherical large particle size recycled aggregate preparation device comprises a sphericalaggregate processing device and a vibration table, wherein the processing device comprises an upper mold and a lower mold; hemispherical grooves are correspondingly formed in the upper mold and the lower mold; when the upper mold and the lower mold are fit, the respective hemispherical grooves are in one-to-one correspondence to form a spherical space; and a feeding port is formed in the upward side of the hemispherical groove of the upper mold. Corresponding amount of high-efficiency water reducing agent is added to waste concrete with known performances taken from concrete mixing stations and prefabricated factories to form recycled concrete; the recycled concrete is poured into a spherical aggregate processing device; and the recycled concrete in the spherical aggregate processing device is vibrated to become dense with the help of a vibrating table, and then is maintained to obtain spherical large particle size recycled aggregate. The spherical large particle size recycled aggregate is applied to the field of preparation of concrete-filled steel tubular columns. The device has the advantages of simple structure and convenient operation; and the prepared spherical large particle size recycled aggregate has small discreteness of physical property and mechanical property and relatively high safety.

The invention discloses a white quantum dot composite particle as well as a preparation method and device thereof to solve the problems of poor stability and low quantum efficiency of quantum dot materials. The white quantum dot composite particle comprises a particle main body which is a polymerized body formed by a photopolymerization reaction of a photo-initiator and a polymerizable component through ultraviolet irradiation, and red, green and blue quantum dots which are dispersed in the particle main body and are different in concentration. The composite particle disclosed by the embodiment of the invention has the beneficial effects as follows: the red, green and blue quantum dots are limited in a spherical space, and the quantum dot materials are hard to agglomerate and high in stability and quantum efficiency; and moreover, the preparation method is simple and easy for batch production.

The invention discloses a rock mass structural plane dominant occurrence clustering analysis method based on a netting algorithm. The method comprises the following steps: (1) selecting an engineeringrock slope needing to be analyzed in the field; (2) carrying out polar coordinate transformation on the occurrence of the structural plane and projecting the occurrence into a spherical space; (3) calculating the similarity degree rij between occurrence samples by adopting the square of the sine value of the acute angle between the unit normal vectors of the structural plane, and constructing a fuzzy similarity matrix R of the occurrence of the structural plane; (4) transforming the fuzzy similarity matrix R of the structural plane occurrence; (5) constructing a lambda section matrix Rlambdaof the occurrence of the structural plane for the transformed fuzzy similar matrix R; (6) transforming the section matrix Rlambda of the occurrence of the structural plane; (7) clustering and groupingof structural plane occurrence of the transformed section matrix Rlambda; and (8) calculating effectiveness evaluation indexes under different grouping numbers according to a clustering result of thestructural plane occurrence, and determining an optimal grouping number in combination with engineering practice to obtain the structural plane dominant occurrence. According to the invention, the grouping result is more reasonable, and the dominant occurrence accords with objective reality more.

The invention discloses a multi-dimensional theater. The multi-dimensional theater comprises a theater body, a screen, one or more movable stages and one or more pod type auditoriums, wherein the theater body is internally provided with a spherical space, the screen is arranged on the inner wall of the theater body, used for displaying videos, and provided with one or more performance windows, the movable stages are arranged on the theater body and can extend into the spherical space from the performance windows, each comprise a telescopic performance stage body which can extend into the spherical space from the corresponding performance window, and are used for carrying players for live performance, and the pod type auditoriums are arranged in the spherical space of the theater body and can be moved in the spherical space in multiple dimensions. According to the multi-dimensional theater, the players can be carried to conduct live performance while audience watches videos on the screen, the audience can interact with the players and can swing forwards, backwards, leftwards and rightwards, move up and down and rotate, and therefore the content of the spherical videos can be watched at multiple angles, the constraint of plane vision is removed, and the immediacy sense and the reality sense of watching are enhanced.

The invention discloses an automatic spine feature point recognition method based on a Gauss curvature flow. Firstly, three-dimensional reconstruction is carried out on a CT image of a human spine, a spine body three-dimensional model in need of feature point annotation is obtained, and mesh generation is carried out on the spine body model obtained in the first step; a certain point on the model is selected manually, and the mean curvature of each vertex in spherical space with the minimal radius to be R around the manual selection point is calculated; and finally, n points with the maximal Gauss curvatures around the manual selection point are selected, the n points with the maximal Gauss curvatures and the selection point are subjected to inner product respectively, and the solved point has the minimal included angle. The accuracy for feature point annotation can be improved, the data measurement accuracy is thus improved, and the accuracy is high, and the realization is easy.