820 results about "Control point" patented technology

A method to construct a solid three-dimensional polygonal model of a three-dimensional irregular volume within a GIS platform comprising of: (1) introducing desired data including control points and attributes relating to the three-dimensional irregular volume into the GIS platform; (2) estimating at least one two-dimensional polygon representing a lateral boundary of the three-dimensional irregular volume based upon values of variable of interest at the control points; (3) estimating irregular surfaces representing top and bottom of the three-dimensional irregular volume by interpolating grids of depth values from the control points for the top and bottom surfaces of the three-dimensional irregular volume; (4) clipping the estimated irregular surfaces with the estimated at least one two-dimensional boundary polygon; (5) constructing multipatches of a network of triangular panels representing top surface, bottom surface, and sides of the three-dimensional irregular volume to produce a solid three-dimensional irregular volume model within the GIS platform; and (6) joining the attributes to the solid three-dimensional irregular volume model within the GIS platform. A method to construct a wire-frame three-dimensional polygonal model of a three-dimensional irregular volume within a GIS platform comprising of the same steps 1-4 and 6 as described above and the step of constructing a grid of regularly spaced polylineZs representing top surface, bottom surface, and sides of the three-dimensional irregular volume to produce the wire frame three-dimensional irregular volume model within the GIS platform. A system comprising of a computer system and processing software using the method of the present invention to construct a three-dimensional polygonal model of a three-dimensional irregular volume within a GIS platform.

An acoustic field may be produced from a transducer array having known relative positions and orientations In this acoustic field, one or more control points may be defined. An amplitude may be assigned to the control point. Mid-air haptic effect for a virtual object on a human body part may be generated by moving the control point in a single closed curve comprising a plurality of curve segments. The single closed curve traverses at least one location where the human body part intersects with the virtual object. Additionally, a user may interact with virtual three-dimensional content using the user's hands while a tracking system monitoring the user's hands, a physics engine updates the properties of the virtual three-dimensional content and a haptic feedback system provides haptic information to the user.

This invention relates to one bump knife tool multi-coordinate wide row process optimization method, which comprises the following steps: isolating the tool into one set of intense latitude lines according to its process type; through computation on each latitude line distance to process design curve to get error distribution function; accordingly establishing wide computation method and restrains to form tool optimization module. To avoid backward adjust, the part is selected with one control point and to determine one point beyond for one relative initial position from one point in program public error and the selection point.

An encoding or decoding method with affine motion compensation includes receiving input data associated with a current block in a current picture, and deriving a first affine candidate for the currentblock including three affine motion vectors for predicting motion vectors at control points of the current block if the current block is coded or to be coded in affine Merge mode. The affine motion vectors are derived from three different neighboring coded blocks of the current block. An affine motion model is derived according to the affine motion vectors if the first affine candidate is selected. Moreover, the method includes encoding or decoding the current block by locating a reference block in a reference picture according to the affine motion model. The current block is restricted to becoded in uni-directional prediction if the current block is coded or to be coded in affine Inter mode.

A three-dimensional positioning method includes establishing the geometric model of optical and radar sensors, obtaining rational function conversion coefficient, refining the rational function model and positioning the three-dimensional coordinates. Most of the radar satellite companies and part of the optical satellite only provide satellite ephemeris data, rather than the rational function model. Therefore, it is necessary to obtain the rational polynomial coefficients from the geometric model of optical and radar sensors; followed by refining the rational function model by the ground control points, so that object image space intersection is more serious; and then followed by measuring the conjugate point on the optical and radar images. Finally, the observation equation is established by the rational function model to solve the three-dimensional coordinates. It is obvious from the above results that the integration of optical and radar images does achieve the three-dimensional positioning.

In a pressure control system having a solenoid-operated fluid valve that has an output hydraulic pressure which varies in accordance with a solenoid input signal, a dynamic learning block is configured to adjust the initial, default values for control points stored in a pressure-current (P-I) data table based on observed (measured) operating points that reflect the solenoid's actual transfer characteristic. A feed forward control block is configured to generate the solenoid input signal having a level based on the adjusted control points in the data table, which improves the accuracy of the solenoid input signal. An adjustment method uses a plurality of circular buffers each configured to store observed operating points falling within a respective range, and provides a mechanism to allow adjustment of the control points based on only partial data.

The invention discloses a measuring method for an unknown aviation engine blade profile of a CAD model, wherein the measuring method is used for solving the technical problem that an existing aviation engine blade profile three-coordinate measuring method is low in precision. According to the technical scheme, multiple curves reflecting distribution states of curvature in the main shaft direction and located on the multiple blade profile are measured and analyzed, control points of the curves are figured out on the basis of curvature and allowance control, and then blade measuring sections are determined; on the basis of a curvature continuous prediction method, a measuring point set of each measuring section is planned, and three-coordinate measuring carried out on the unknown aviation engine blade profile of the CAD model is achieved. Because the blade measuring sections are selected according to blade profile curvature distribution characteristics, measuring point planning is carried out on the measuring sections on the basis of the continuous curvature prediction method, and the continuous curvature prediction method has better robustness, so extraction of molded line redundant points is reduced, meanwhile the situation that extraction points are fit with changes of measuring section molded line curvature is guaranteed, measuring efficiency is improved, and measuring precision can be guaranteed.

A method for associating a three-dimensional surface representing a real object and a three-dimensional reference surface, said reference surface being represented by a set of reference points, the method comprising: obtaining a set of real points representing the real surface, determining the normal vector of each point of said obtained set of real points, selecting, among the set of real points, control points according to the determined normal vector by converting the set of real points to a bi-dimensional space of normal vectors, generating sets of points having similar normal vector among the points of the set of real points and selecting, for each set of points with similar normal vector, one point that is a control point of the real surface, determining correspondence points close to the set of reference points that are determined to correspond to the control points of the real surface, and determining the motion that minimizes the distances between the control points of the real surface and the correspondence points.

The method for encoding/decoding three-dimensional meshes of dots or vertices connected in the form of facets delimited by edges; the mesh M is defined by connectivity data T and geometry data G includes the steps of:

• • lossless encoding of the connectivity data T into encoded connectivity data Tc,
  • iteratively generating a progressive mesh hierarchy, i.e. a set of meshes with progressive levels of detail, PM (M*),
  • generating a piecewise smooth approximation M* of the original mesh M, from the mesh connectivity T; this smooth approximation M* being described as follows:
  • a. compressed connectivity data Tc;
  • b. a small number N of control dots and
  • c. a number of indexes S of edges called protruding edges of the mesh M, identified beforehand,
  • using the progressive mesh hierarchy PM(M*) to calculate a prediction of approximation errors in M* compared with the original mesh M.

The invention, which belongs to the field of underwater robots, discloses an unmanned aerial vehicle path planning method in an ocean current environment based on a population super-heuristic algorithm. A population is initialized and initial comprehensive cost values of all individuals in the whole population are obtained according to the cost function; a population basic operation set and a corresponding operation selection probability vector are set; one individual in the population and a population basic operation corresponding to the maximum probability in the operation selection probability vector are selected, the individual is operated, the basic operation of the population is repeated until the entire population is traversed, so that the iteration is completed; the operation selection probability vector is adjusted again and next iteration is carried out until the iteration number reaches a set value; and after iteration completion, an individual with the lowest cost value isselected, one group of control points is formed by combining a starting point, an end point and a fixed control point of a B-spline curve, and an optimal path is generated. Therefore, problems that the path planned based on the existing AUV path planning method is not smooth and is tracked difficultly, and the tracking energy consumption is high are solved.

A novel, easy to use, and computational efficient rubber sheeting algorithm is designed for interactive image registration in a web-based application environment. The algorithm has two steps, including a piece-wise linear interpolation step to interactively find a suitable set of control points and displacement vectors, and a following optional global radial basis wrap step to generate smoother result using the final control point set. A dynamic Delaunay triangulation method is designed to efficiently update the decomposition of the image. Natural and intuitive wrapping result will be dynamically generated in real-time while the user interactively insert, delete or drag a control point. The number of control points is not limited, and a large number of control points can be used if necessary without compromising the performance of the algorithm. With enough control points specified using the piece-wise rubber-sheeting step, the wrapping result can be further smoothed by using the optional, click-button poly-quadric global wrapping method in the second step. The algorithm is implemented as a Java Applet and able to run as a cross-platform web-based application.

In a pressure control system having a solenoid-operated fluid valve that has an output hydraulic pressure which varies in accordance with a solenoid input signal, a dynamic learning block is configured to adjust the initial, default values for control points stored in a pressure-current (P-I) data table based on observed (measured) operating points that reflect the solenoid's actual transfer characteristic. A feed forward control block is configured to generate the solenoid input signal having a level based on the adjusted control points in the data table, which improves the accuracy of the solenoid input signal. An adjustment method uses a plurality of circular buffers each configured to store observed operating points falling within a respective range, and provides a mechanism to allow adjustment of the control points based on only partial data.

The invention discloses a sub-basin dividing and information extracting method based on IDL and Mapinfo and belongs to the hydrology science of physical geography science. According to the sub-basin dividing method, high-accuracy DEM data are used for dividing basins in an upscaling mode through an IDL program language, and the characteristics of IDL matrix orientation and high operation efficiency are well used. Through analysis of DEM, the geology and geomorphic features such as sub-basin dividing structures, the topological relation between sub-basins, sub-basin control points, the control range, water-collecting area, riverway length between sub-basins and gradients are obtained, and support is provided for basin runoff simulation. Meanwhile, powerful geographic information system software MapInfo is used for displaying sub-basin dividing results. Based on the IDL, the sub-basin topological relation and the sub-basin control point position are generated, and the sub-basin topological relation is shown through the MapInfo programming language MapBasic.

The invention discloses a digital aerial photography measurement method for mapping at ultrahigh magnification. The digital aerial photography measurement method comprises the following steps: firstly, basic control measurement, namely distributing a plurality of basic control points in a measurement area, and establishing a measurement control network; secondly, photo control measurement; thirdly, interior aerial triangulation; fourthly, topographic map data acquisition, namely acquiring data by a method of combining exterior actual measurement with interior acquisition with the following steps: step 401, exterior actual measurement, namely carrying out exterior actual measurement on elevation node points of a ground surface in a measurement area, and step 402, interior data acquisition, namely noting ground objects which cannot meet the mapping precision requirement in a three-dimensional model in the interior data acquisition process; fifthly, data annotation and exterior supplementary measurement; and sixthly, topographic map data editing. The method provided by the invention is simple in step, reasonable in design and convenient to achieve, has a good using effect, and can effectively solve the problem of difficulty in performing large-scale digital mapping by small-scale aerophotographs.

In some aspects, the disclosure is directed to methods and systems for reducing memory utilization and increasing efficiency during affine merge mode for versatile video coding by utilizing motion vectors stored in a motion data line buffer for a prediction unit of a second coding tree unit neighboring a first coding tree unit to derive control point motion vectors for the first coding tree unit.

The invention discloses a detecting and tracking method for lane lines of autonomous vehicle navigation. The method comprises firstly converting video frames into grayscale images, describing a tight degree of local connection of each point in the images through fuzzy connection degree and membership function, and extracting general contour of roads; secondly, extracting edges by using a Canny operator, refining the images by using a refinement algorithm and detecting control points of the road edges; and thirdly, fitting the edge points of the roads by using a non-uniform B-spline interpolation (NUBS), that is, calculating the fitting points by using controlling points. Experimental results show that the method takes grayscale of the roads and gradient characteristics into account, and thus reduces interferences of shadows or other noises and is relatively high in accuracy. A probability of successful detection of the lane lines is 92 % for detection of 50 images.

The invention discloses a geological boundary point cloud data extraction method based on a BIM environment and system. Spline curve fitting is carried out on a target geological boundary in a geological survey original section document; according to the number of control points set by a user in each geological boundary, point coordinate data of a corresponding geological boundary spline curve areextracted from graphic data of the geological boundary spline curve of a dxf readable file; according to a section interval set by the user, the point coordinate data of the geological boundary in each section are integrated; and the point coordinate data of the corresponding geological boundary in each section are extracted, and three-dimensional point cloud data of the corresponding geologicalboundary are integrated, and extraction of point cloud data in different formations is realized. The obtained point cloud data can realize surface fitting in multiple BIM software, boundary surfaces in different formations are generated, and a civil engineering BIM model is built and obtained.