35results about How to "Avoid division" patented technology

The invention discloses a polarized synthetic aperture radar (SAR) image classification method based on Freeman decomposition and data distribution characteristics and mainly solves the problems of high computation complexity and poor classification effect in the prior art. The polarized SAR image classification method includes step: (1) performing Freeman decomposition for polarized SAR images to be classified to obtain plane scattering power, dihedral angle scattering power and volume scattering power; (2) initially dividing the polarized SAR images into three classes according to the three scattering powers; (3) calculating the distribution characteristic parameter xL of each pixel point in each class; (4) subdividing each of the three initially divided classes into three classes according to the distribution characteristic parameters xL to divide the whole polarized SAR images into nine classes; and (5) performing complex Wishart iteration for the obtained nine-class dividing results to obtain the final classification result. Compared with the typical classification method, the polarized SAR image classification method is rigorous in polarized SAR image dividing, good in classification effect and small in computation complexity and can be applied to terrain classification and object identification of the polarized SAR images.

The invention belongs to the technical field of transformer fault type detection, and discloses a transformer state evaluation and fault detection method based on multi-source data fusion. Transformercurrent data are detected by using a current sensor corrected in a cyclic mode based on least square method. A voltmeter improving accuracy based on a remainder splitting algorithm is utilized to detect transformer voltage data. Transformer temperature data are detected by using a temperature sensor. A gas sensor performing temperature compensation based on a standard artificial bee colony algorithm is used for detecting concentration data of transformer fault characteristic gas. A data processing software is utilized to build a transformer fault model, and the transformer fault state is evaluated according to the detected data. An alarm or notification is given in time according to the evaluation results by using an alarm apparatus. The transformer state evaluation and fault detection method adopts a theory of a probability fuzzy set to process and analyze; the fault state of a transformer can be evaluated, the uncertainty of the characteristic value of the fault state of the transformer is reflected, and theoretical guidance is provided for the evaluation of the fault state of the transformer.

The invention relates to the field of image processing, and discloses an image processing method, an image processing device, a readable medium and electronic equipment. The image processing method comprises the steps of: obtaining a to-be-corrected image shot by a camera of the electronic equipment; calculating a zoom distance between each pixel point on the to-be-corrected image and a brightnessreference point of the to-be-corrected image; determining the correction coefficient of each pixel point based on the relationship between the zoom distance of the camera and the correction coefficient, the pixel points having the same physical distance with the brightness reference points but different brightness have different zoom distances, and the pixel points having the different zoom distances with the brightness reference points have different correction coefficients; and correcting the brightness of each pixel point based on the correction coefficient of each pixel point to obtain acorrected image. Therefore, the pixel points with the same physical distance with the brightness reference point and different brightness in the to-be-corrected image have the same brightness after correction, and the shadow correction effect is improved.

The invention discloses a method for predicting material thermal conductivity on the basis of finite difference method of three-dimensional image, and belongs to the method for predicting the material thermal conductivity on the basis of finite difference method. The method has the basic principle: 1) an image analysis method is used for distinguishing different phases or components in the image; 2) a computer language program is used for reading the position and color information of all pixels into a computer memory; 3) each pixel is constructed into a cell element, and the cell element is endowed with the thermal conductivity according to the component to which the cell element belongs; 4) a stable thermal conductivity equation is dispersed, calculating a heat transfer coefficient matrix is calculated, and a calculation equation set is constructed; 5) a temperature field is obtained by the calculation equation set; and 6) the material equivalent thermal conductivity is calculated. The three-dimensional model is adopted to accurately obtain a thermal conductivity result, and the finite difference method is adopted to shorten calculation time and save memory consumption. The whole process is automatically finished, and the method is very practical for the model with a huge node amount.

Aiming at the problems existing in the prior background differencing that the practicability is bad, the speed is slow, and the accuracy is bad, the invention discloses an improved moving object segmentation method which uses a plurality of Gaussian distributions to construct the background in a video sequence, so as to further segment the foreground, and the method is based on a plurality of Gaussian distributions. The invention also discloses methods for initialization, data collection, pixel value calculation, etc. The invention has the advantages that the speed is fast and the accuracy is high, and is a moving object segmentation method which has very high practical value.

The invention discloses a method for analyzing the influence of cable parameters of an electric drive system on system electromagnetic interference, and particularly relates to the technical field ofanalysis of the influence of the cable parameters on the system electromagnetic interference, which comprises the following specific analysis steps: S1, modeling the electromagnetic interference of the electric drive system; S2, establishing a system radiation EMI prediction model; sS3, performing multi-coupling simulation on the system based on a field line; S4, analyzing the influence of power cable parameters on electromagnetic interference; and S5, analyzing the influence of the wiring parameters on the crosstalk of the signal lines. According to the invention, the influence of cable parameters on the electromagnetic interference of the system is analyzed through a field line hybrid simulation method. Current distribution replaces a complex cable harness model in three-dimensional full-wave analysis, grid division of actual cable harnesses is avoided, the number of grids of the whole three-dimensional simulation is greatly reduced, the memory requirement is reduced, and the simulation efficiency is improved.

The invention relates to a real-time enhancement method of a low-illumination image and belongs to the embedded image processing technical field. With the method adopted, the problems of low noise reduction instantaneity and low contrast after noise reduction of a low-illumination image in the prior art can be solved. The method is realized based on an image processing unit and a driving signal control unit, wherein the image processing unit and the driving signal control unit are completed by the same FPGA; the driving signal control unit controls a low-luminance camera to carry out output at a highest frame frequency; the image processing unit processes a received original image; and the image processing unit is composed of an energy accumulation module and a histogram equalization module. According to the method, the signal-to-noise ratio of the image is improved through the energy accumulation module, and the contrast of the image is improved through the histogram equalization module. The method has a real-time processing characteristic and can meet requirements of a condition that the low-luminance camera works at 50pfs.

The invention relates to a calibration method for measuring equipment, in particular to a novel calibration method for high-precision source-meter integrated measuring equipment. The method comprisesthe following steps: acquiring original data; analyzing the obtained original data; carrying out fitting on actually measured values by using an output true value as a fitting object to obtain a calibration coefficient; and with a set value Z as a fitting object, carrying out fitting on an output true value Y to obtain another group of calibration coefficients and carrying out correction by a microprocessor based on the two groups of calibration coefficients and the original data to obtain a calibrated actually measured value and a calibrated set value. According to the invention, the novel calibration method is an efficient fitting method based on a nonlinear least square method; and cubic spline function is selected as a fitting function. Because calculation of an inverse function is notneeded, derivation and division of a Newton iteration method are avoided; and one group of calibration coefficients can be obtained only through six times of multiplication and three times of addition, so that the complex calculation process and a huge calculation amount of an advanced algorithm are not needed.

The invention provides an SPSA algorithm-based well test interpretation method for a fractured well. The SPSA algorithm-based well test interpretation method for the fractured well comprises the steps of: 1, selecting various fracture parameter iteration initial values and parameter values; 2, generating a simultaneous disturbance vector; 3, estimating a target function SUM; 4, approximately estimating a gradient; 5, correcting a current value, and updating an estimated value; and step 6, outputting an iteration result after iteration, and ending looping. The superiority of the SPSA algorithm-based well test interpretation method for the fractured well in the aspect of solving a high-dimensional optimization problem is embodied aiming at the conditions of more fractured crack parametersand overlarge well test interpretation calculation amount in the exploitation process of a low-permeability reservoir, and accurate parameters are provided for the exploitation of the low-permeabilityreservoir. The method has a certain popularization value.

The invention disclose an LTE uplink frequency domain least-square (LS) channel estimation fixed-point realization method. The method comprises the following steps: S1, carrying out channel estimation on pilot frequency data in a received signal so as to obtain an initial channel response I0; S2, according to the initial channel response I0, generating a channel estimation pre-processing table; and S3, carrying out pre processing on the initial channel response I0 according to the channel estimation pre-processing table so as to obtain a channel response I.

The invention discloses a production die for opened profiles and relates to the technical field of production of profiles. A cleaver divider is arranged at a lower die inlet end at the center of a graph formed by surrounding of an extrusion hole, and the cleaver divider protrudes out of a plane of the lower die inlet end and stretches into a guide hole of an upper die. The die can effectively propel metal to flow to a place needing to be filled, and can avoid forming of a dead zone caused by accumulation of metal, thus being favorable for profile forming. Since metal accumulation is avoided, stress of a cantilever part of the lower die is relieved to a certain extent, the service life of the die is greatly prolonged, and compared with common dies, the extrusion pressure is reduced to a certain extent, and therefore, the production die is especially suitable for producing opened profiles.

The invention belongs to the technical field of direct torque control of a switching table mode and discloses a method capable of improving the instantaneity of direct torque control of a switching table mode. A stator flux linkage vector component is converted into corresponding components in a 60-degree coordinate system and the number of a sector, in which a stator flux linkage vector is located, in voltage vector area division is firstly judged according to the numerical values of two components; and two small sectors for the flux linkage vector are arranged in each voltage vector sector,the numbers of the small sectors are judged through logical comparison and shift operations according to coordinate component values of the flux linkage vector and the sector in which stator flux linkage is located is determined through the numbers of the small sectors. According to the method, the sector in which the stator flux linkage is located is judged in the 60-degree coordinate system, only simple logic judgment and shift operations are needed and the shift operations are mainly targeted at operations of multiplication by 2 and 0.5 in the algorithm implementation process.

The invention discloses a communication reconnaissance simulation method and system suitable for multi-user signals, and the method comprises the steps: obtaining a plurality of multi-user signals, separating the plurality of multi-user signals, and obtaining an independent user signal of each user; respectively converting the separated independent user signal of each user to obtain a time-frequency relation table of each independent user signal; determining a band-pass filter corresponding to the independent user signal based on the time-frequency relationship table corresponding to the independent user signal; filtering the corresponding independent user signal based on a band-pass filter to obtain each sub-carrier frequency signal of the independent user signal; for each independent user signal, performing down-conversion on the sub-carrier frequency signal to obtain a corresponding baseband signal; and performing modulation mode identification and symbol rate estimation on each independent user signal by using a corresponding baseband signal. According to the invention, each sub-carrier frequency signal can be effectively filtered, and the same sub-carrier frequency signal is prevented from being divided into two adjacent channels.