59 results about "Geometric mapping" patented technology

The invention relates to the technical field of three-dimensional point cloud data processing and three-dimensional scene reconstruction, and discloses a three-dimensional laser scanner and camera calibration method based on geometric constraint. The method comprises the following steps: (1) making a calibration board; (2) acquiring a three-dimensional point cloud and a two-dimensional image of the calibration plate; (3) calibrating a camera; (4) calculating a calibration board plane in a camera coordinate system; (5) building point-surface geometric constraint; (6) constructing line-point geometric constraint; (7) constructing surface-surface geometric constraint; (8) calculating a geometric mapping relation of the point cloud and the image. The method has the advantages of deeply analyzing a structure of the three-dimensional point cloud, meanwhile, solving the geometric mapping relation between the point cloud in a laser coordinate system and the image in an image coordinate systemthrough three types of thoughts including the point-surface geometric constraint, the line-point geometric constraint and the surface-surface geometric constraint, making full use of the geometric relation between the calibration board plane and a laser scanning point, and consequently making calibration of the three-dimensional laser scanner and the camera be more accurate and reliable.

The invention provides an urban area and indoor high-precision visual positioning system and method. The image information of a surrounding environment is acquired based on a visual sensor to realize high-precision urban area and indoor positioning. The method comprises the steps that the distinguishing feature information of an image is calculated and extracted after the visual sensor captures the scene image information; according to the distinguishing feature information, similarity degree recognition and matching are carried out in the feature information base of a digital three-dimensional model; according to matching coordinate information recorded in an image feature matching process, a geometrical mapping relation from a three-dimensional scene to a two-dimensional image is restored, and a camera intersection model from a two-dimensional image coordinate to a three-dimensional space coordinate is established to determine the three-dimensional position and attitude information of the visual sensor and a dynamic user; multi-source image information captured by the visual sensor is received; a digital three-dimensional model corresponding to a real scene is reconstructed or updated; and the feature information base is updated. According to the invention, robust and sustainable positioning ability is provided when the surrounding environment changes.

A method for fusing measurements of sensors having different resolutions performs jointly a calibration of the sensors and a fusion of the their measurements to produce calibration parameters defining a geometrical mapping between coordinate systems of the sensors and a fused set of measurements that includes the modality of a sensor with resolution greater than its resolution. The calibration and the fusion are performed jointly to update the calibration parameters and the fused set of measurements in dependence on each other.

A method of and service for optimizing an integrated circuit design to improve manufacturing yield. The invention uses manufacturing data and algorithms to identify areas with high probability of failures, i.e. critical areas. The invention further changes the layout of the circuit design to reduce critical area thereby reducing the probability of a fault occurring during manufacturing. Methods of identifying critical area include common run, geometry mapping, and Voronoi diagrams. Optimization includes but is not limited to incremental movement and adjustment of shape dimensions until optimization objectives are achieved and critical area is reduced.

A system and method for a real-time prognosis of a vehicle comprising a personal communication device comprising an arbitrarily oriented three-axis accelerometer configured to capture a pitch motion and/or roll motion of the vehicle and an onboard diagnostics system communicably connected with the personal communication device enabling bi-directional communication. The personal communication device comprising a processor configured for geometric mapping of a three dimensional Cartesian coordinate of the three-axis accelerometer with the vehicle. The processor virtually orients the coordinates of three-axis accelerometer to coincide with the coordinates of the vehicle. The arbitrarily oriented three-axis accelerometer is configured to capture a road condition and a driver behaviour using a sampling rate between 4 Hertz (Hz) to 10 Hertz (Hz). The system for the real-time prognosis of the vehicle, wherein the real-time prognosis utilizes at least one predictive analysis model to determine real-time prognosis for the said vehicle.

The invention discloses a design method of a solar energy uniform light superposition reflective condenser, wherein a light receiving surface is a photocell plate or a circular heat collection pipe. The design method is characterized in that a condensing lens consists of a limited number of flat plate reflection mirrors and broken line-shaped reflection mirror slot frames and is placed on a solartracking frame, a precise calculation formula of the width and the position of a space coordinate of each reflection mirror and the detailed steps of the geometric mapping method are deduced accordingto the constraint condition that two parallel light rays reflected by two end points of a line segment of a cross section of each reflection mirror respectively fall on two end points of a line segment of the cross section of the photocell plate or are respectively tangent with the circumference of the cross section of the circular heat collection pipe and the normal line of a mirror surface of the reflection mirror is an angle bisector of an included angle between incident light and reflected light, thereby ensuring that the reflected light of each flat plate reflection mirror is uniformly superposed on the light receiving surface, leading the single-chip output features of the photocell to be consistent, improving the light-emitting efficiency of components, leading the processing of the condenser to be easy and reducing the cost. The calculation formula can be used for optimizing the tilt angle and the nominal focal length of the photocell plate.

A pixel compositor device for routing an incoming stream of pixel data having been rendered elsewhere and bound for being projected. The device includes a plurality of digital signal inputs each adapted for receiving a plurality of pixel information from the incoming stream of pixel data. The digital signal inputs are in communication with at least one buffer for the pixel information once received by the device. A processing unit is included for image warping the pixel information by performing, on each of a respective of the pixel information: (i) a mapping relating to location of the respective pixel information, and (ii) a scaling function. The geometric mapping can be performed by applying an interpolation technique; and the scaling function can be any of a number of photometric correction functions (alpha-blending, color uniformity correction, image brightness or contrast adjustment, etc.). Once an image warping has been performed on the respective pixel information, it is routed out of the device through one of several digital signal outputs. A system for routing pixel data is disclosed having two or more of the pixel compositor devices in communication with an image rendering cluster of units (as the source of the incoming stream of pixel data) and a plurality of projectors; as is a method for routing an incoming stream of pixel data having been rendered elsewhere and bound for being projected.

The invention discloses a method for quickly obtaining and measuring an orthophotoquad of a city skyline contour line facede. The method comprises the following steps of: shooting a local image of the city skyline contour line facede hop by hop by a camera with a coordinate obtaining device, and recording the coordinate direction and the lens orientation of the camera at each shooting time; obtaining the horizontal distance between each shooting point and an object to be shot; building a geometric mapping relationship between each shooting point and the object to be shot to generate the orthophotoquad of the city skyline contour line facede; and outputting measurement data of the orthophotoquad of the city skyline contour line facede in combination with the city skyline contour line facede and the orthophotoquad of the city skyline contour line facede. After the method is used, the image distortion error caused by the conventional technology can be reduced, and the measurement precision can be improved.

A method for fusing measurements of sensors having different resolutions performs jointly a calibration of the sensors and a fusion of the their measurements to produce calibration parameters defininga geometrical mapping between coordinate systems of the sensors and a fused set of measurements that includes the modality of a sensor with resolution greater than its resolution. The calibration andthe fusion are performed jointly to update the calibration parameters and the fused set of measurements in dependence on each other.

The invention provides an indoor positioning method. The method comprises the following steps: inputting a real-time obtained image, and detecting and outputting a currently located indoor environmenttype by an environment sensing module; performing indoor positioning by using a basic positioning module to obtain a regional level or meter level precision positioning range; matching the output environment type in the environment sensing module with a geographic database to obtain a precise range of the location; corresponding the obtained precise range to a three-dimensional model of a locatedindoor space, and performing two-dimensional-three-dimensional matching with the real-time obtained image in an image matching module; and restoring a geometric mapping relationship between a two-dimensional image and the three-dimensional model according to three-dimensional-two-dimensional matching point pair coordinates, establishing a camera projection model of the two-dimensional image to the three-dimensional model, and solving a three-dimensional space coordinates and pose of an image sensor to obtain final result positioning. According to the method, on the basis of the common indoorpositioning technology, the image recognition technology is imported to effectively improve the precision of indoor positioning.

The invention discloses an ultra-precise displacement laser sensing method. According to the method, ultra-precise measurement is performed on the displacement of an object on the basis of an ultra-precise laser displacement sensor. The ultra-precise laser displacement sensor comprises a laser emitting device, a circular arc specular reflecting device, a laser receiving device and a controller; and the controller calculates the displacement value of the object to be detected according to a geometric mapping relationship between the change amount of a light receiving position on the laser receiving device and the surface position amount of the object to be detected. According to the ultra-precise displacement laser sensing method of the invention, the circular arc specular reflecting deviceis additionally arranged on an optical path from the reflected laser of the object to be detected to the laser receiving device; the position of a laser spot finally projected onto the laser receiving device changes greatly on the basis of the change of the angles of incidence of different laser beams on a circular arc mirror surface, the laser beams being identical in direction and different inincident position; and therefore, the displacement of the object to be detected is amplified at a high magnification on the laser receiving device, and the ultra-high precision measurement of the object to be detected is realized when the resolution of the laser receiving device is constant.

A system is disclosed for incorporating a realistic simulated catheter or catheters within a catheter guidance and control system that operate from the same closed-loop position control feedback and geometric mapping data as the real position control system and are able to make contact with real and simulated datasets. These catheters may be operated in a pure simulation mode without interacting with real catheters and position control hardware, or may be used as control cursors to enhance the placement of catheter positioning targets. The catheter tip, which is focus of magnetic control, is realistically guided by the control system parameters, while the remainder of the catheter line is realistically constrained by the mapped chamber geometry and introducer sheath.

The invention discloses a natural resource real-time video monitoring method and system with vector red line data embedded, and the method comprises the steps: obtaining the natural resource vector red line data and a corresponding high-resolution remote sensing image, and obtaining an initial image of a camera; superposing the vector red line data onto the high-resolution remote sensing image, identifying homonymous points on the video image and the vector red line data by means of semantic information of the remote sensing image, and calculating a geometric mapping relationship; mapping thevector red line data to a real-time video to obtain a video monitoring area; matching adjacent frame images of a monitoring video to obtain homonymous points by obtaining feature points which are uniformly distributed in scale and space; obtaining a geometric transformation relationship between the images according to the homonymous points, and mapping the monitoring area range on the previous frame of image to the next frame of image to realize association of the monitoring areas between the image frames; and performing area measurement on the monitoring video according to the geometrical relationship, and performing subsequent related target motion analysis on the basis of the determined video area so that automatic area early warning alarm can be realized.

The present invention is a non-coherent optical fiber apparatus that may be used for imaging. Methods are described to produce geometric mapping data for an optical fiber apparatus. Images may be transmitted, reconstructed (using mapping data for the apparatus) and displayed. In addition, one or more fiber characteristics may be measured and used in conjunction with mapping data to further improve or correct the geometric, photometric or spectral content of images. The apparatus data described may be provided, by a manufacturer, for example, in raw form, or this data may be may be provided in a manner that is more user transparent, such as incorporating it into various image processing algorithms.

The invention discloses a laser welding head dynamic track generation method based on a platform motion tangent angle, the swing track of a laser welding head rotates according to the current X-axis and Y-axis motion track tangent direction to form a laser welding head track with an angle following function, the laser welding head track at the moment realizes dynamic generation of track data, and the laser welding head track has the angle following function. The angle control data of the galvanometer needs to be recalculated periodically according to angle parameters. Under a two-dimensional coordinate system, a Bezier curve is used for representing the swing track of a laser welding head, original coordinate points and a geometric transformation matrix are multiplied through second-order matrix multiplication, new coordinate points after geometric mapping and a new curve calculated through angle following are obtained, discretization is carried out, and control data of a galvanometer motor are obtained. The laser welding head swing track with the angle following function can better adapt to the process requirements of various machining tracks, meanwhile, the output density of laser energy is more uniform, and the final welding effect is improved.