32 results about "Equidistant grid" patented technology

The invention provides a fractal multi-resolution simplified method used for large-scale terrain rendering. The method comprises the following steps: (1) determining a terrain grid rendering region in a scene, firstly carrying out equidistant grid resampling on DEM (digital elevation model) data of coarser grids to form a terrain quadtree node; (2) projecting a view point to an XOZ plane, creating a terrain multi-resolution frame, and setting a plurality of different resolution levels from 1 to n on the terrain by adopting the multi-resolution LOD (level of detail) technology according to the view point; and (3) determining the level of the terrain according to the distances between the view point and different regions of a model, extracting characteristic parameters from an original DEM data set, adopting a DEM-based fractal random midpoint displacement interpolation to generate a continuous real terrain, and realizing reconstruction of a large-scale terrain. The terrain realized by adopting the method in the invention has good space continuity, cracks between different levels in a common multi-resolution model can be avoided, and smooth transition of different resolution models can be realized.

In a method and a reconstruction device for reconstructing an image from MR raw data acquired with multiple coils and entered at sample points on a grid in k-space, the sample points are arranged on data entry trajectories, respectively, along one-dimensional edges in an equidistant grid dimension characteristic for the respective edge. If raw data were acquired at all sample points, k-space would be sufficiently scanned, but the raw data are entered only on a portion of the sample points so that sufficient scanning exists only in an internal region of k-space, with undersampling existing in an external region of k-space. Reconstruction of the missing raw data is performed by reconstructing raw data for a specific coil for the non-sampled sample points in the internal region using the raw data acquired with that coil for other sample points in the internal region, without using raw data acquired with other coils, and for the non-sampled sample points in the external region, using the raw data acquired for the internal region, as well as reconstructed raw data, and using raw data acquired with different coils.

The invention belongs to the technical field of building construction quality control of nuclear power plants, and in particular relates to a nondestructive detection method for ultrasonic detection of nuclear power plant containment concrete defects. The method includes the following steps: (1) preparation before detection; (2) the arrangement of measure points, to be more specific, inner wall measure points are arranged by first measurement of actual arc length of a containment inner wall detection area, then equal division of the arc length and drawing of equidistant grids; the outer wall measure points are arranged, the outer wall measure point position and the inner wall measure point position are in the same engineering elevation, the outer wall measure points are on straight lines determined by the inner wall measure points and the centers of circles, and the inner wall measure points pass through the concentric circles; (3) data measurement and save, to be more specific, according to the serial number sequence, two energy transducers are respectively arranged on corresponding measure points on the inner side and the outer side of a barrel body for successive measurement and save; (4) data processing, to be more specific, acquired and saved acoustic parameters are processed and analyzed for judging whether abnormal measure points exist; and (5) post processing, to be more specific, repetition measurement and encryption detection of an important focused region is performed on the basis of the above steps.

The invention provides a wide and thick plate temperature monitoring method for grid exponential distribution, and belongs to the technical field of automatic control on wide and thick plate rolling. The problem that the on-line operation time is too long caused by the fact that the grid division in a thickness direction is extremely fine when a thick gauge steel plate is rolled under the condition of large temperature gradient is solved. In a differential temperature rolling process, grid division is carried out on the steel plate from the surface to the core part of the steel plate along the thickness direction by adopting a manner that the log Kow of the thickness is equal and the true value of the thickness is in exponential distribution, so as to form a distribution form that grids at the surface are relatively fine and grids at the core part are relatively wide, thus improving the on-line operation efficiency of a temperature monitoring calculating process, and reducing the on-line operation time; compared with a traditional difference method of equidistant grid division, the temperature control accuracy can be improved to 6 to 8 DEG C from the traditional 10 to 15 DEG C by the method; the method can be widely popularized to wide and thick plate rolling plants, so as to improve the temperature control accuracy of a wide and thick plate product.

The invention relates to a rice leaf shape acquisition device and a rice leaf shape parameter extraction method. A main body of the rice leaf shape acquisition device comprises a camera, a camera fixing device, a support frame transverse bar, a leaf bearing table, a support frame vertical bar, a support frame regulator, a computer, check paper, a double-faced adhesive tape and a black adhesive tape, wherein the camera is fixed on the support frame transverse bar through the camera fixing device; the leaf bearing table is a black horizontal tabletop; the black adhesive tape is adhered onto the leaf bearing table through the double-faced adhesive tape, and one gluey surface is upward; the support frame vertical bar is fixed in the middle of one side of the leaf bearing table; a distance between the camera and the tabletop can be regulated through the support frame regulator; the camera is directly connected with the computer; the check paper is a piece of white paper on which a black equidistant grid point is drawn. By the utilization of the device and the method provided by the invention, the rice tiller image acquisition and the rice leaf vein curve and leaf angle extraction are convenient, quick and accurate, hardware and a method are provided for the extraction of rice leaf shapes and parameters, and basic parameters can be provided for stimulation and optimal design of rice plant shapes.

The invention relates to a rice tiller image acquisition device and a rice leaf vein curve and leaf angle extraction method. A main body of the rice tiller image acquisition device comprises a camera, a support frame, a background board, a computer, a camera fixing device, a regulating plate, a stalk fixing device and check paper, wherein the camera is fixed on the support frame through the camera fixing device, and the height of the camera is regulated through selecting a fixed position; the background board is a black wooden board; the stalk fixing device is a wooden block with an iron hairpin, and a stalk is inserted on the iron hairpin when an image is shot; the regulating plate can regulate a distance between the camera and the background board; the camera is a high-definition network camera and is directly connected with the computer, and a rice tillering image is shot by software provided by the camera; the check paper is a piece of white paper on which a black equidistant grid point is drawn. By the utilization of the device and the method provided by the invention, the rice tiller image acquisition and the rice leaf vein curve and leaf angle extraction are convenient, quick and accurate, hardware and a method are provided for the extraction of rice leaf shapes and parameters, and basic parameters can be provided for the stimulation and the optimal design of rice plant shapes.

The invention relates to a distributed space-time correlation model trajectory tracking method based on statistical inference. Beacon nodes are deployed in the shape of an equidistant grid in a locating space according to longitudinal and transverse directions, and beacon node information is saved in each unknown node; the beacon nodes receiving notification information transmitted by the unknown nodes emit locating signals at a fixed frequency, and the unknown nodes receive and form multiple time sequences according to the beacon nodes; each unknown node constructs a boundary time sequence to detect a boundary crossing event and determine a corresponding time point; each unknown node constructs regional time window statistical quantity and infers the current region; the position of the intersection points of the trajectories and the boundary is inferred; and the trajectories are formed and the result is uploaded to aggregation nodes. According to the method, RSSI locating information probability distribution characteristics in the trajectory tracking problem and space-time data mining are overall considered, and the boundary crossing event and regional information are discovered through the method of time-space information statistical inference so that trajectory tracking can be realized.

The invention provides a model voxelization efficiency optimization method based on cup operation. The method comprises the following steps: S1, dividing equidistant grids in an external cuboid spaceof a model on a cpu; S2, carrying out external voxelization of the model, i.e., carrying out mesh generation to meet the condition that a point set on the surface of the model is the external voxelization of the model; S3, carrying out the internal voxelization of the model, i.e., carrying out the mesh generation, meeting the condition that a point set in the model is the internal voxelization ofthe model, and completing the voxelization of the model after the external voxelization and internal voxelization of the model are completed. According to the method, the voxelization efficiency of the model is improved, and the working efficiency is improved.

The invention discloses a spatial aggregation scale selection method for geographic big data. The spatial aggregation scale selection method comprises the steps of performing equidistant grid divisionon a research area under different grid sizes; generating scale snapshots of different scales; establishing point clouds for snapshots of different scales; carrying out topological feature extractionon the point cloud of each scale snapshot; performing scale effect analysis on each scale snapshot to obtain a key scale; and selecting a required spatial aggregation scale according to the key scale. According to the method, a topology analysis method is introduced; clustering modes, annular modes and inter-class modes of data under different aggregation scales are described through multi-ordertopology invariants, the influence of the scale effect is quantified through evolution of the modes, then scale mutation points are found to judge a proper research scale range, and therefore the selected spatial aggregation scale better meets actual requirements.

The invention discloses a key driving force analysis method for urban and rural lake water storage change, which comprises the following steps of performing equidistant grid division on a research area, and selecting a plurality of typical sampling points of unit area water storage according to a screening standard; establishing a database bearing driving force factors, and performing data preprocessing; scanning the lake basin characteristic trend database to form a candidate item set C1; judging the candidate item set C1, generating a frequent item set L1, and drawing various histograms of the L1; adopting an apriori-Gen algorithm, combining various data in the frequent item set L1, and forming a candidate item set C2; judging the candidate item set C2 to form a frequent item set L2; and iteratively generating a maximum frequent item set, and determining key driving forces of several lake water storage changes. According to the method, factors influencing the urban and rural lake water storage change are analyzed one by one by using the association algorithm, and the key driving force influencing the urban and rural lake water storage change is judged through iterative calculation of the association algorithm.

The invention discloses a pattern distortion adjustment printing process method for an automobile instrument dial, and relates to the technical field of automobile dial printing. The pattern distortion adjustment printing process method for the automobile instrument dial is a process method which is drawn in combination with engineering design software, equidistant grid lines are arranged on an instrument dial pattern, and adjustment is carried out after printing and forming, so that pattern deformation is made up and controlled; and by adopting the process method, the printing procedures can be simplified, and the process method has the advantages of low cost, short time period, flexible product adjustment data, obvious effect and the like.

The invention provides a line-marking frame plate. The frame plate is provided with a plurality of equidistant and evenly arranged elongated basket hollow frames. When in use, place the frame plate flat on white paper, and use a pen to draw equidistant and uniform horizontal grid lines in the empty frame grid, so that it can be used directly as credible paper, and can make full use of waste of various sizes. Paper, the characteristics of reducing waste of resources.

The invention relates to a design method of an integrated photonic band-pass filter based on genetic optimization, and belongs to the technical field of micro-nano photonics devices. A mode analysis module of physical field simulation software is utilized, an equivalent refractive index method is adopted to enable a three-dimensional model to be equivalent to a two-dimensional model, the overall shape and the structural unit shape of a device are selected, and then an equidistant grid is used for dividing the overall device to carry out genetic optimization operation, so that the structure ofthe band-pass filter is determined through an output optimal structural unit. According to the method, the design efficiency is greatly improved, and compared with a traditional macroscopic optical device, the manufactured band-pass filter is ultra-small in size and high in integration degree, has good performances and excellent linear type, is large in bandwidth and is low in roll-off range; andthe indexes meet the requirements of current micro-nano machining. By using the method, a researcher can focus on cascade application of the device and exploration of an internal mechanism of the device, and an alternative scheme is provided for development of optical processing and optical communication in the future.

The invention discloses an iron ore powder liquid phase fluidity detection method based on sintering actual production conditions, and belongs to the technical field of ironmaking sintering. The method comprises the following steps: taking the actual industrial analysis CaO mass fraction of sinter as a constant target value; selecting calcium ash in a sintering production field as a flux, and determining that the mass fraction of CaO in a mixture is a batching structure with a set constant target value according to the mass fractions of the calcium ash, iron ore powder SiO2 and CaO; pressing a sample with a fixed specification by using a grinding tool, and simulating a sintering temperature rise curve to sinter the sample; utilizing organic glass with equidistant grids to calculate the vertical projection area of the fused sample by applying a differential method and a cutting compensation method; characterizing the ratio of the vertical projection area of the sample after melting to the vertical projection area of the sample before melting as a liquid phase fluidity index; taking an index mean value of a plurality of groups of samples of a single iron ore powder as the liquid phase fluidity of the iron ore powder under the actual sintering production condition, and guiding the sintering ore blending according to the complementation principle.

The invention provides a magnetic field deformation calibration tool and method in an electromagnetic navigation system. The method comprises the following steps: firstly, placing a magnetic field generator in a working environment used by a magnetic field in a data training stage, and collecting the magnetic field coordinates at the positions of equidistant grids on a coordinate collection plate;obtaining the magnetic field coordinate values of all points on the three-dimensional equidistant grid lines, and solving the deformation quantity of the magnetic field coordinates according to the physical coordinates defined by the grid lines and the collected corresponding magnetic field coordinates; combining the deformation quantities obtained in different magnetic field working environmentsto form a magnetic field deformation statistical model; and in the using and operating stage, collecting local magnetic field coordinates once on the coordinate collecting plate to obtain local deformation quantity, and obtaining the global deformation quantity value of the current magnetic field coordinates by obtaining sparse expression. According to the present invention, the method has the advantages of quickness, accuracy and universality, the problem that electromagnetic navigation is easily interfered by environmental factors is quickly solved through sparse solution of the statisticalmodel of the magnetic field deformation data, and the navigation system is more accurate.

The invention discloses a two-dimensional phased-array antenna design method and device and a two-dimensional phased-array antenna in the technical field of radar, and the method comprises the steps: obtaining the number N of antennas, the wavelength and the minimum spacing of the antennas, and constructing a grid with N * N equidistant grid points according to the number N of the antennas and the wavelength; according to the constraint conditions that only one antenna is distributed in each row and each column and the distance between any antennas is not smaller than the minimum interval, all antenna distribution arrays of the antennas in the grids of the equidistant grid points are obtained; far-field distribution data of each antenna distribution array is calculated and obtained, and signal-to-noise ratios corresponding to all the antenna distribution arrays are calculated according to all the far-field distribution data; and selecting a required antenna distribution array from all the antenna distribution arrays according to the signal-to-noise ratio parameter. A two-dimensional phased array design scheme and a two-dimensional phased array antenna arrangement structure for eliminating grating side lobes by using fewer antennas are realized.