837 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.

One or more control points are identified within a reticle layout that is used in a simulation of a manufacturing process for an integrated device layer. Further, a current geometrical layout pattern is determined in the vicinity of the control points, and a cache is searched for a matching geometrical layout pattern. If the search is successful, a simulation result associated with the matching geometrical layout pattern is retrieved from the cache and reused for the current geometrical layout pattern. Alternatively, if the search is unsuccessful, a simulation result associated with the current geometrical design pattern is computed and stored in the cache for future reuse.

Improved algorithm techniques may be used for superior operation of haptic-based systems. An eigensystem may be used to determine for a given spatial distribution of control points with specified output the set of wave phases that are the most efficiently realizable. Reconstructing a modulated pressure field may use emitters firing at different frequencies. An acoustic phased-array device uses a comprehensive reflexive simulation technique. There may be an exchange of information between the users and the transducer control processors having the ability to use that information for optimal haptic generation shadows and the like. Applying mid-air haptic sensations to objects of arbitrary 3D geometry requires that sensation of the object on the user's hand is as close as possible to a realistic depiction of that object. Ultrasonic haptics with multiple and / or large aperture arrays have high-frequency update rates required by the spatio-temporal modulation. More efficient haptic systems require the prevention of a channel of audio unintentionally encoding phase information that may distort its perception.

The invention discloses a connection curve algorithm for constructing intersection entry and exit lane Links based on a Bezier curve. It can be ensured that the curve is tangent to the entry lane Link and the exit lane Link through characteristics of the Bezier curve, meanwhile, the through region of the curve can be safely controlled by means of the position of a middle control point, the phenomena of passing through an intersection safety island and a road edge are avoided, and the generated curve fits a safe wheelpath line. Accordingly, the safe wheelpath reference line can be provided for an unmanned car when the car passes through the intersection. According to characteristics of the Bezier curve, the algorithm for connecting wheelpath curves of the intersection entry and exit lane Links is built, the algorithm meets the fitness and safety demand of the actual wheelpaths, the algorithm is unified and convenient to obtain, and the algorithm can be used for different moving direction connecting relations.

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.

A method and system is provided for rendering bicubic surfaces of an object on a computer system. Each bicubic surface is defined by sixteen control points and bounded by four boundary curves, each corresponding to an edge, and each boundary curve is formed by boundary box of line segments formed between four of the control points. The method and system of include transforming only the control points of the surface given a view of the object, rather than points across the entire bicubic surface, and using the four boundary edges for purposes of subdivision. Next, a pair of orthogonal boundary curves to process is selected. After the boundary curves have been selected, each of the curves is iteratively subdivided and the pair of orthogonal internal curves, wherein two new curves are generated with each subdivision. The subdivision of each of the curves is terminated when the curves satisfy a flatness threshold expressed in screen coordinates, whereby the number of computations required to render the object is minimized.

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.

The principles of the present invention relate to appropriately rendering a graphical object when a corresponding outline has exact or inexact control points. Based on the positions of control points on an outline it is calculated, that between a first parent control point and a second parent control point, the outline passes approximately though the center of a grid location. The positions of the first and second parent control points are adjusted by a first and second fraction of the size of a grid location respectively. The position of the child control point is realigned along a second axis of the grid space based on the positions of the first and second parent control points. The child control point position is rounded by a fraction of the size of a grid location based on the positions of the first and second parent control points.

The invention discloses a direct positioning method and a direct positioning system based on satellite observation angle error estimation. The method comprises the following steps of: acquiring a control point, namely selecting at least one control point from a first scene image of a satellite remote sensing image, and acquiring a precise geographic coordinate and height information of the corresponding control point; calculating a coordinate error, namely converting the precise geographic coordinate of the control point to be a coordinate under a geocentre rotation coordinate system, and calculating a rough coordinate of the control point under the geocentre rotation coordinate system so as to acquire the coordinate error of the control point in the geocentre rotation coordinate system; calculating a precise observation angle, namely acquiring an observation angle error of a satellite sensor, and compensating the observation angle error to a second scene image on the same orbit so as to acquire a precise observation angle value; and precisely positioning a pixel point, namely acquiring a precise positioning result of the second scene image which is free of the control point and is positioned on the same orbit according to the precise observation angle value.