97 results about "Internal point" patented technology

The invention relates to an image splicing method based on improved image fusion. The method mainly settles technical problems of low real-time performance, splicing seam and ghost in prior art. The method comprises the steps of respectively performing characteristic point extraction on a target image and a reference image by means of an A-KAZE algorithm, and establishing a characteristic description subset; constructing a KD-tree, establishing a characteristic point data index, matching the characteristic point by means of a bidirectional KNN matching algorithm, obtaining an initial matching result, performing external point elimination and internal point reserving on the initial matching result through a RANSAC algorithm, and finishing image registering; and performing image fusion by means of an improved Laplace multi-resolution fusion algorithm based on a splicing seam, wherein the step comprises an optimal splicing seam by means of dynamic planning method, limiting a fusion range according to the optimal splicing seam, and finally performing fusion by means the Laplace multi-resolution fusion algorithm in a fusion range, thereby finishing image splicing. The image splicing method settles the problems in a relatively good manner and can be used in image splicing.

The objective of the present invention is to provide a method for approximating and displaying a three-dimensional object represented by CAD data. In particular, the present invention provides a method for approximating CAD data representing a three-dimensional object, comprising steps of: (a) generating a mesh with mesh lines for approximating each face of the three-dimensional object represented by the CAD data within a rough conversion tolerance with respect to a specified conversion tolerance; (b) approximating a boundary edge surrounding and defining each individual face with a plurality of curves within the specified conversion tolerance, approximating each of the curves with a polyline comprising points and connecting lines within the rough conversion tolerance to define boundary points which are the points of the polylines, and obtaining a vector tangential to the curve at each of the boundary points; (c) generating polygons with three or four vertices by connecting internal points which are points of intersection of the mesh lines inside the boundary edge, and by connecting the boundary points and the internal points that are adjacent to and inside the boundary edge; (d) calculating a vector normal to the face at each of the vertices of each of the polygons, storing information identifying the vertices and the corresponding normal vectors, and storing the tangential vector at each of the boundary points obtained at the step (b); (e) converting each of the polygons with three or four vertices to a triangular or quadrilateral surface by using a plurality of control points obtained by processing the information identifying the vertices, the normal vectors, and the tangential vectors; and (f) examining if each of the triangular or quadrilateral surfaces is close to the face represented by the CAD data within the specified conversion tolerance, and if not, regenerating a mesh with a narrower mesh width and more mesh lines on the face to repeat the steps (c)-(e) and (f). It is preferable that the polygons are triangles.

An apparatus and method thereof adjust tonal characteristics of an image to a printer. The apparatus includes a storage unit storing a color correction scheme using a color gamma curve varying in accordance with variable values comprising locations of first and second internal points on the color gamma curve and a gamma coefficient, and a variable input unit receiving the variable values. The apparatus further includes a tone adjusting unit adjusting the tonal characteristics of the image by reflecting the variable values in the color correction scheme and generating bitmap data as a result of the adjustment of the tonal characteristics, and outputting the bitmap data to the printer.

The invention discloses a method for calculating a quenching medium heat exchange coefficient by combining a finite element method with an inverse heat conduction method, which relates to a method for calculating a quenching medium heat exchange coefficient. The method comprises the following steps of: using a probe body, testing by an experiment to obtain the cooling curve of an internal point of the body, establishing a finite element model of the probe body, simulating a temperature field, and verifying the one-dimensional property of a problem; establishing a one-dimensional heat conduction micro equation and a sensitive coefficient equation under a coordinate system, and solving the heat-flow density value of the surface of the body surface by using the inverse heat conduction method; and verifying the measured temperature of the internal point of the probe in comparison to a calculated value, namely the heat exchange coefficient of the quenching medium calculated according to the Newton heat exchange law, so that the solution accuracy is ensured. The method is used for calculating the heat exchange coefficient of quenching medium.

At least one exemplary embodiment is directed to a laser cutting method where a laser beam is condensed at internal points inside a substrate forming processing regions, and where the laser is swept along a cutting line, where the cutting line is associated with a recess on the substrate and where the recess can be formed contemporaneously with the formation of the processing regions.

The invention relates to a power grid risk analysis method based on a node marginal electricity price, and belongs to the field of power grids. The method calculates the marginal electricity price andthe output of the generator based on the original dual-point internal point method optimal power flow model, and solves the single risk evaluation index under the high-risk N-3 fault operation statethrough the nonlinear programming method, and further calculates the joint entropy index. Comprehensive risk assessment of the grid. The method uses the power load data of a city for one month to scanthe high-risk N-3 line fault scenario, so that the risk assessment can consider most of the possible situations, and the result is closer to reality; the comprehensive risk index solved includes thedouble index. Combined weighted entropy, this indicator takes into account the combined influence of power flow distribution, load loss and congestion severity on grid risk level and self-organized criticality, which makes up for the lack of individual indicator analysis.

The invention relates to a fast self-calibration method for a fish-eye lens binocular camera. And internal parameters and external parameters of the fish-eye lens binocular camera are quickly calibrated by utilizing polar constraint provided by a common three-dimensional scene. Firstly, a fish-eye lens binocular camera synchronously shoots images of a common three-dimensional scene, and feature point extraction and matching are carried out. Secondly, focal lengths and radial distortion parameters of the two cameras and a basic matrix between the two cameras are solved at the same time by utilizing at least nine image matching point pairs, and an image matching inner point set is determined; and then a rotation translation relation between the coordinate systems of the two cameras is obtained through focal lengths of the cameras and basic matrix decomposition. And finally, the internal parameters and the external parameters of the binocular camera are optimized according to the image matching internal point set determined by the RANSAC. The fisheye lens binocular camera with serious radial distortion can be efficiently and accurately calibrated under the common three-dimensional scene condition, and the method is suitable for equipment with limited computing power such as a mobile phone and an unmanned aerial vehicle and has important research significance and wide application prospects.

The invention discloses a method for determining a temperature process curve of ultrahigh fly-ash content hydraulic massive concrete. The method comprises: using normal concrete and ultrahigh mixture concrete to perform an adiabatic temperature rise test, manufacturing an ultrahigh mixture concrete cubic large test block with side length of 1.2 m to carry out a temperature measuring test, combined with an internal point actual measured temperature record of a certain double-curvature arch dam which is established by using the normal concrete, providing an ultrahigh mixture concrete adiabatic temperature rise model, to improve temperature simulation calculation program, so as to simulate a temperature process curve of an ultrahigh mixture concrete dam which has no construction precedent. The method can be used for temperature-stress test evaluation and early-age crack resistance.

A lattice dividing unit determines lattice lines to divide parameters of all points of a picture at every division and supplies distortion correction parameters (distortion correction coordinates) on the lattice points to a distortion correction memory. A polynomial of degree n coefficient deriving unit expresses all distortion correction coordinates on each lattice line in the form of a function relative to positions on lattice lines and approximates the distortion correction coordinates by desired division polynomial of degree n. Further, a sample point deriving unit compresses distortion correction parameters based upon the division polynomial of degree n obtained from the polynomial of degree n coefficient deriving unit. In the derived division polynomial of degree n, internal points which result from dividing both ends of the division polynomial of degree n by n is supplied to the distortion correction memory as new distortion correction parameters (approximated distortion correction coordinates). Thus, a memory capacity of a required memory can be reduced in the image processing for correcting distortion of an image.

The invention provides a charging and discharging optimization control method for an electric automobile group. The method comprises the following steps of acquiring next-day charging and dischargingtime period data of each automobile participating in charging and discharging; discretizing next-day time into a plurality of time slots and generating a time slot set according to the next-day charging and discharging time period data of all the automobiles; acquiring electric power flow data and sensitivity data of each time slot in the time slot set; calculating the charging and discharging power of each automobile in each time slot by means of an internal point approach according to the sensitivity data. By means of the charging and discharging optimization control method, voltage fluctuation is reduced, peak-to-valley differences of loads are reduced, the losses of a power distribution network are decreased, and economic benefits of users of the electric automobiles are increased.