286 results about "Spatial geometry" patented technology

The invention relates to a three-dimensional wire frame structure method and system fusing a binocular camera and IMU positioning. On the basis of binocular vision, the invention initializes and fusesinertial measurement information by using a divide-and-conquer strategy, implements tracking, positioning and drawing, and can robustly run in indoor and outdoor environments and complex motion conditions. On the basis of accurate positioning, 3D wireframe reconstruction and iterative optimization are carried out based on the posture of the key frame. Linear segments are matched by local featuresand spatial geometric constraints and back-projected into three-dimensional space. Through the angle and distance constraints, the straight line segments are divided into different sets. Based on thegrouping results, the fitting region is determined and the straight line segments are merged. Finally, a 3-D wireframe structure is output. The invention fuses multi-source information to improve thestability and robustness of the system on the traditional vision-based positioning and mapping method. At the same time, line information is added to the key frame to sparsely express the structuralcharacteristics of the three-dimensional environment, which improves the computational efficiency.

The present invention discloses a method for rapid integrated presentation of a BIM model and a three-dimensional geographical information system. The method comprises: encoding a BIM model; performing weight reduction on the BIM model, and extracting and importing attribute information; projecting the BIM model into a three-dimensional geographical information system according to design coordinates; reorganizing the BIM model according to a spherical coordinate system, and re-importing the reorganized BIM model; and after releasing the BIM model, querying spatial geometry information and attribute information of the BIM model in the three-dimensional geographical information system. According to the method disclosed by the present invention, a digitized three-dimensional architectural model is used as a core during design and construction of architectural engineering, and the BIM design model is well applied to the field of civil engineering and is combined with geographical information, thereby solving the problems such as that when the BIM design model is integrated into the three-dimensional geographical information system, carried information is missing, a loading speed is slow, and spatial positions of members in buildings or structures are shifted.

A system and method for knowledge based development of interior models for configurable spaces, including storing a digital definition of the interior section of the passenger vehicle and parameters related to the objects, storing a digital definition of a plurality of three dimensional stay-out spaces associated with one or more of the objects, defining one or more collision rules between a first three dimensional stay-out space and a second three dimensional stay-out space, the rules define whether the first three dimensional stay-out space and the second three dimensional stay-out space may overlap, and designing the interior section to accommodate objects based on the defined collision rules and object parameters.

The invention provides a method for actually compensating for geometrical errors of a five-axis numerical control tooth manufacturing machine tool through the inverse kinematics. The method includes the steps of building a space geometrical error model containing position unrelated errors and position related errors on the basis of a homogeneous coordinate transformational matrix, and deducing a processing code analytical expression containing the geometrical errors from the space geometrical error model according to the characteristics of the homogeneous coordinate transformational matrix. Theoretical cutter location data is modified by 12 pose deviations (6 static pose deviations and 6 movement pose deviations) of a cutter relative to a workpiece. The geometrical errors of the machine tool can be compensated for by substituting the position unrelated errors, the position related errors and the modified cutter location data into the processing code analytical expression for compensating for the geometrical errors of the machine tool, and meanwhile the12 pose deviations of the cutter relative to the workpiece are modified. The error compensation method is simple in compensation process, easy to understand, small in calculation amount, high in compensation efficiency and wide in application range, and the basic compensation concept of the method is suitable for numerical control machine tools of various types.

The invention provides a navigation enhancement method and system based on a low-orbit constellation. The method comprises the following steps: (a) broadcasting a navigation direct transmission signaland navigation enhancement information by using a low-orbit constellation satellite; (b) comprehensively utilizing the navigation direct transmission signals of the navigation satellite and the low-orbit satellite, and the navigation enhancement information to carry out precision location, speed measurement and timing by a user. The method can enhance the observation space geometrical configuration of the user by using the low-orbit satellite fast-moving feature and shorten the precise positioning initialization time of the user. The user receiver has the same hardware configuration as the universal satellite navigation receiver. Only needing to receive the direct transmission signals of the navigation satellite and the low-orbit satellite in one direction can rapid precise positioning beachieved, without needing to consider other data communication links. The navigation enhancement system comprises a low-orbit constellation, a ground control system and a user receiver. The system can achieve global coverage and provide the user with real-time precision positioning, speed measurement and timing services with high precision and high integrity.

The present invention provides a tool to depict the relative impact to the losses of a insurer's portfolio from catastrophic events, such as a hurricanes or earthquakes, at a specific risk level by geographic area using a grid level database and a spatial database to generate maps. The maps developed using this tool help visualize the potentially dangerous areas for writing new business and / or identify preferential places for growth. The tool also creates a list of zip codes with incremental losses at a particular risk level representing the relative attractiveness of writing new policies (or eliminating existing policies) in one zip code versus another. The spatial database provides rich spatial geometry features in the form of raster images available in the spatial database and the invention provides the corresponding spatial algebra to create relativity maps with gradient features and zip code loss information.

A method of geo-coding is disclosed for providing geographically relevant information, advertisements and media over a network to users. Geographic regions around the world may be represented by spatial geometry with unique identifiers. The spatial geometry and identifiers may be used to determine geographic relevance when compared to any input location. Thereafter, information, advertisements and media that may be determined geographically relevant, either locally, nationally or internationally, may be displayed to the user.

An image of an individual (2) is obtained using a digital camera (1). The image data is then processed by ratio determination module (10) and an image conversion module (12) to analyze the image and determine data representative of the distribution of blood and melanin in the skin of the imaged individual. This chromophore distribution data is then processed by an image generation module (18) which generates an image representative of the expected appearance of epithelial tissue having the determined distribution of chromophores where the epithelial tissue is under fixed illumination and has a flat spatial geometry and where all the identified melanin is present solely in the epidermis. The presence of dermal melanin can then be identified by comparing the original image data and the image derived from processing the calculated chromophore distributions and identifying where the ratio of these images differs by more than a threshold, the threshold being set at a level above the amount of variation expected due to lighting and geometry differences.

In a non-destructive method for determining the internal structure of a heat conducting body, such as a cooling structure of a turbine blade, a flow medium is passed through the internal structure and the resultant thermal image on an external surface of the body is registered using a pixelised thermal image detector. Heat transfer coefficients and wall thicknesses of the internal structure are determined by means of a 1-,2-, or 3-dimensional inverse method that includes the numerical modelling of the surface temperatures using initial values for heat transfer coefficients and wall thicknesses and an optimisation of the values using an iteration method. In a special variant of the method, the spatial geometry of the internal structure of the body is determined by means of the same inverse method and a geometry model that is optimised by iteration. No prior knowledge of the internal geometry is required.

The invention discloses a geoid-vertical line deviation correction method and system for a GNSS-R specular reflection point. The method comprises the steps of acquiring spatial position information ofnavigation satellites and a receiver; determining a specular reflection point on the reference ellipsoid according to the spatial position information of the navigation satellites and the receiver; introducing the elevation correction amount, iteratively correcting the specular reflection point on the reference ellipsoid to the geoid to obtain a specular reflection point on the geoid; calculatingthe spatial geometric relationship between the normal projection of the geoid and the reflection path, determining the vertical line deviation correction amount of the specular reflection point, anditeratively correcting the normal direction of the reflection path to the normal direction of the geoid, and carrying out iterative correction on the specular reflection point on the geoid to obtain afinal specular reflection point corrected by the vertical line deviation on the geoid. The geoid-vertical line deviation correction method and system improve the positioning accuracy of the specularreflection point and provide support for acquiring a marine gravity field with high spatial resolution and high precision.

The invention discloses a spacecraft product final assembly precision measuring method based on a workpiece coordinate system, relates to the field of final assembly precision measurement and particularly relates to a spacecraft product final assembly precision measuring method. The method is used for solving the problems of the existing theodolite measuring system of low measurement efficiency, high difficulty, difficult processing of a cubic mirror, relatively low qualified rate and load weight of the cubic mirror launched with satellite. In the invention, the cubic mirror coordinate system is replaced by a workpiece coordinate system, and the method comprises the following steps: selecting 4-6 public reference points from the public reference points on the spacecraft body surface and the reference object plane; collecting the coordinate data of the public reference points using a laser tracker, and establishing a public coordinate system; performing corresponding spatial geometric processing and establishing a reference coordinate system; and fitting the component surface and calculating the normal of the component surface and the component axis through software using the laser tracker under the reference coordinate system, and performing comparative calculation with the reference coordinate system to obtain the assembly precision of the component. The method disclosed by the invention is applicable to the measurement of spacecraft product final assembly precision.

A system for generating a model of a patient specific cut guide instrument for harvesting a graft comprises a model of a graft defined by an implant interface surface, a bone interface surface, and a spatial geometry therebetween, the model being specific to a patient. A patient-specific instrument generator outputs the model of the patient specific cut guide instrument, the patient-specific instrument generator including a position determination module for orienting and positioning at least a first guide axis, and for positioning an abutment on a model of a donor bone as a function of the spatial geometry, and an instrument body generator module for generating a model of the patient specific cut guide instrument comprising a body supporting a cut guide to perform a depth cut in the donor bone positioned and oriented as a function of a contact of the body with the abutment on the donor bone, and of the model of the graft, a first guide channel for alignment with the first guide axis, and at least one anchor guide for securing the patient specific instrument cut guide on the donor bone as abutted with the abutment and aligned with the first guide axis, whereby the patient specific cut guide instrument is used for harvesting the graft for subsequent implanting without alterations to the spatial geometry of the graft.

The invention relates to a downhole directional hole bedding guided drilling system and method based on formation lithology identification. The lithology while-drilling identification of a drilling stratum is achieved through a direct parameter comparison method and an orientation radiating rose diagram comparison method according to coal measure stratum lithology while-drilling identification criteria and the stratum natural radiation value, measured by a coal measure stratum physical property parameter while-drilling measurement device in real time, of the near-bit position. By combination with measurement of a drilling track, precise space positioning of a practical drilling track relative to a target stratum is achieved, and bases are provided for controlling a downhole directional hole to do bedding extension in the target stratum in the preset direction; the technical problems that an existing underground coal mine directional drilling technology can only conduct drilling according to the space geometric positioning of the drilling track, cannot distinguish strata and is poor in drilling efficiency and low in target stratum elongation are solved; and through precise bedding directional drilling of the downhole directional hole, an effective means is provided for improving the drilling construction efficiency and the utilization effect, verifying the stratum geological information of a mine lot and ensuring drilling construction safety.

The invention provides an infrared image-based contact network geometrical parameter detection method and system. The method includes the following steps: arranging a thermal infrared imager on the top of an inspection van to collect an infrared image under a pantograph-catenary running state; performing gray scale-based template matching on the infrared image to obtain intersection point coordinates of a pantograph slide plate and a line of contact in the infrared image; and according to calibration of transformation from infrared image coordinates to spatial geometrical coordinates, performing coordinate transformation on the intersection point coordinates of the pantograph slide plate and the line of contact in the infrared image, thereby obtaining the height and the stagger value of the line of contact. The method is relatively high in detection precision, is not influenced by original image quality, and equipment that is used is simple in structure and relatively low in cost.

A multi-angle ultra wide band antenna for electronic devices is disclosed. The said antenna cover all mobile bands worldwide: 700 / 850 / 900 / 1700 / 1800 / 1900 and 2100 MHz and with sufficient bandwidth to include the 2400 and 2500 MHz mainly used in wireless networks, having a radiated element supported by a first substrate and expanding into a spatial geometry for transmission and reception of radio signal. An antenna base has a plurality of first solder pads on a second substrate for physical attachment to a printed circuit board and a second solder pad electrically connected to a terminal of said antenna to radio circuitry feed point, with compatible surface mount technology. The first and second substrates are joined by a bending line as a single substrate, where the said first substrate is allowed to be bent relative to the plane of the said second substrate.

The invention discloses a traffic accident field surveying instrument based on an active omnidirectional visual sensor. The traffic accident field surveying instrument comprises an omnidirectional visual sensor, an omnidirectional planar laser light source, a GPS (Global Position System) sensor, a compass and a microprocessor, wherein the GPS sensor is used for positioning the traffic accident scene and automatically generating the road plane graph, the compass is used for fixing the measurement direction, and the microprocessor is used for performing three-dimensional image pickup measurement on the panoramic picture of the omnidirectional visual sensor and performing visualized recovery and digital three-dimensional representation of the traffic accident scene. A system application software is used for automatically picking up a panoramic picture of the traffic accident scene, automatically measuring geometrical data of vehicles, objects, traces and the like on the scene, automatically outputting field record diagram, the field scale map, the field sectional view, the field vertical view and the field analysis chart and providing a traffic accident field surveying method. The traffic accident field surveying instrument has the advantages of high environment applicability, high measurement speed and accuracy, high automation degree and can be used for performing visualized recovery and digital three-dimensional representation of the traffic accident scene.

An apparatus for information extraction from electromagnetic energy via multi-characteristic spatial geometry processing to determine three-dimensional aspects of an object from which the electromagnetic energy is proceeding. The apparatus receives the electromagnetic energy. The received electromagnetic energy has a plurality of spatial phase characteristics. The apparatus separates the plurality of spatial phase characteristics of the received electromagnetic energy. The apparatus r identifies spatially segregated portions of each spatial phase characteristic, with each spatially segregated portion of each spatial phase characteristic corresponding to a spatially segregated portion of each of the other spatial phase characteristics in a group. The apparatus quantifies each segregated portion to provide a spatial phase metric of each segregated portion for providing a data map of the spatial phase metric of each separated spatial phase characteristic. The apparatus processes the spatial phase metrics to determine surface contour information for each segregated portion of the data map.

The invention discloses a BIM-based engineering quality detection method and system, and the method comprises the steps: obtaining the spatial position three-dimensional point data of the surface of ascanned object, so as to form a scanned three-dimensional entity point cloud; performing data processing on the point cloud to obtain the complete spatial geometric dimension of the scanned object, and reversely generating a three-dimensional point cloud model; performing comparative analysis on the three-dimensional point cloud model and a pre-generated BIM model to obtain a quality detection report. The BIM-based engineering quality detection method and system have the beneficial effects that: the point cloud data of the scanned object are obtained to reversely generate the three-dimensional point cloud model, and comparative analysis is performed on the three-dimensional point cloud model and the BIM model of engineering design, so that the deviation between the entity and the design can be compared, the construction quality evaluation is accurate, rapid, objective and comprehensive, the reason of the deviation can be found out through the exported electronic report, correction insubsequent construction is facilitated, and the field construction quality is guaranteed.

The present invention discloses a two-dimensional code pre-deformation design method on a conical surface. The method comprises the steps of laterally stretching an original two-dimensional code image to obtain a first deformation two-dimensional code image; and longitudinally stretching the first deformation two-dimensional code image to obtain a pre-deformed two-dimensional code image. The laterally stretching operation and the longitudinally stretching operation are conducted according to a certain spatial geometry relation to realize the image mapping. According to the above technical scheme of the two-dimensional code pre-deformation design method on the conical surface, the original two-dimensional code image is pre-deformed according to the certain spatial geometry relation and the pre-deformed two-dimensional code image is printed on the plane of a conical presswork. In the curved-surface condition, the projection plane thereof is just a undistorted two-dimensional code. The two-dimensional code can be scanned and decoded at the center thereof by any decoding software. Therefore, the application range of the two-dimensional codes is improved.

The invention relates to electroencephalo-graph and vision detection and the measurement of a three-dimensional attitude of an object. In order to meet the requirement of intelligent, rapid, high-precision and low-cost detection of the three-dimensional attitude of the object in reality, the technical scheme is that: a geometric constraint-based method for measuring a three-dimensional attitude of an object is realized by means of a sigma two-dimensional turntable, two cameras, camera supporting frames, a measuring target and a computer; the two cameras are respectively fixed on the respective supporting frame and the positions of the cameras are adjusted according to the height of the turntable; and four non-coplanar infrared light-emitting diodes (LEDs) on each plane of the measuring target serve as positioning characteristic points, so that the two-dimensional turntable drives the target to make deflecting and pitching motions in two degrees of freedom. The method is realized by resolving the coordinate values of the characteristic points under a camera coordinate system according to geometric constraint formed by a spatial geometric shape of connecting lines of the characteristic points and the coordinate values of the characteristic points on a charge coupled device (CCD) image surface on the basis of the four non-coplanar characteristic points. The method is mainly applied to measuring the three-dimensional attitude of the object.

The invention discloses a method for verifying a verification code and a server. When a server side receives a verification request sent by a client side, M three-dimensional model reference pictures and the single corresponding identification are returned to the client side; when the server side selects N pictures from the three-dimensional model reference pictures, transformation is performed according to the spatial geometry transformation algorithm, the single identification of the N selected three-dimensional model reference pictures respectively serves as the single identification of transformed N ordered pictures; the transformed N ordered pictures are returned to the client side; the three-dimensional model reference pictures corresponding to the ordered pictures are selected, the single identification of the selected three-dimensional model reference pictures is led to serve as the verification code which is sent to the server side through the client side; and the verification code is compared with the single identification on the server side, and verification is passed if the verification code coincides with the single identification. By aid of the method and the server, decoding resistance of the verification code is improved, the verification code can be recognized by human eyes easily, and both safety and availability are considered.

A method of generating a density enhanced model of an object is described. The method includes generating a customized a model of an object using a pre-defined set of models in combination with at least one projection image of the object, where the customized model is formed of a plurality of volume elements including density information. A density map is generated by relating a synthesized projection image of the customized model to an actual projection image of the object. Gains from the density map are back-projected into the customized model to provide a density enhanced customized model of the object. Because the density map is calculated using information from the synthesized projection image in combination with actual projection images of the structure, it has been shown to provide spatial geometry and volumetric density results comparable to those of QCT but with reduced patient exposure, equipment cost and examination time.

The invention discloses a satellite-loaded SAR specified latitude area echo simulation method, which comprises the following steps of: 1, performing spatial geometry relationship modeling on the satellite-loaded SAR; 2, acquiring satellite-loaded SAR echo simulation parameters through the given wave level parameter table; 3, acquiring a geocentric angle and a middle parameter K; 4, acquiring an angle gamma 1, an angle gamma 2, an ascending node argument u, a real argument of periapsis f, an eccentric angle E and an average argument of periapsis phi; 5, determining the initial time t1 of the echo simulation; 6, determining the finish time t2 of the echo simulation; and 7, performing the satellite-loaded SAR echo simulation according to the initial time t1 and the finish time t2 of the echo simulation. The satellite-loaded SAR specified latitude area echo simulation method has the advantages of high precision, strong practicality, low redundancy of the acquired simulation data, high intuition, and the like.

The invention provides a method, a medium and a system for reconstructing a three-dimensional model through a multi-angle image set, and the method comprises the steps: prompting and obtaining an image set which is continuously shot for a target according to a preset shooting angle and a shooting distance; extracting the positions of the feature point pixels of the target in the images, and calculating the relative coordinates of the feature point pixels in the space to obtain the relative coordinates of all the feature point pixels; and fitting the relative coordinates of all the feature point pixels to obtain a reconstructed three-dimensional model of the target. According to the method, equipment such as special laser, radar and infrared equipment is not needed, a two-dimensional imageof a target is shot through a single two-dimensional image acquisition device by changing angles for multiple times, the space coordinates of the pixels of the feature points are calculated through aspace geometry method, then fitting is carried out, a three-dimensional model of the target is constructed, reliability and convenience are ensured, and the requirement for high precision on a curvedsurface is met.

The invention discloses an excavation slope rock information extraction and three-dimensional reconstruction method. The method mainly comprises the steps that three-dimensional laser scanning point cloud data of an excavation slope surface are acquired; structural surface geometrical information of a slope rock is extracted by a Ransac algorithm; a rock block formed by the structural surfaces is extracted by using space geometry, a Flood Fill algorithm and a coding classification method; and a rock three-dimensional digital model is reconstructed and calculation and statistics are performed on the rock volume and blockness distribution information. The rock block information of the excavation slope surface can be automatically extracted so that the degree of block development formed by cutting of the structural surfaces can be visually reflected, and the defects of time consumption and labor consumption of manual measurement can be overcome; and the degree of integrity of the rock can be evaluated according to the extracted statistical information of the rock so as to provide the basis for the support design of the excavation slope.

The invention discloses a target detection method and a target detection device based on a geometrical inversion array. A front detection and back end target inversion separation mode is adopted, a detection terminal adopts a single-sending multi-receiving array sensor / antenna, is in charge of the sending of ultra-wide band detection signals and the receiving of echo signals, detection and echo signals and the space coordinates of receiving and sending array elements are transmitted to a wireless moving terminal through a wireless module, relevant data is transmitted to a cloud operation server in charge of operation after the target inversion through a wireless or cabled network, a signal processing method is utilized for estimating the signal transmission time delay from the sending array element to each receiving array element, the space geometry principle is utilized for reckoning a plurality of target space positions in one step, and the inversion results are transmitted back to the detection terminal through a wireless module and are then displayed by a man-machine interaction interface. The device adopts ultra-wide bands for detecting signals, the front end detection and back end target inversion separation detection mode is adopted, the detection precision can be improved, the equipment complexity is reduced, the size and the weight of the equipment are reduced, and the manufacturing cost is reduced.

The invention relates to a municipal road BIM (building information modeling) design model and GIS (geographic information system) data integration method, which comprises the following steps of 1) exporting a road BIM design model with an IFC (Inverse Fast Center) format from a three-dimensional municipal road design platform, and analyzing BIM model elements through an IFC model analyzer; 2) establishing a mapping relation between the GIS model elements and the BIM model elements, realizing conversion from the BIM model elements to the GIS model elements, and finally storing the conversion in an IFC relational database; 3) performing semantic analysis on the road BIM design model according to the BIM model elements and the GIS model elements obtained through analysis, and geometrically converting BIM entity elements obtained through analysis into three-dimensional GIS geometric elements; and 4) according to the mapping relationship in the IFC relational database, extracting the related spatial geometric information and attribute information data by adopting a plurality of detail level LOD hierarchical compression, and displaying the converted three-dimensional municipal road model.