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34 results about "Gaussian density" patented technology

In one dimension, the Gaussian function is the probability density function of the normal distribution, (1) sometimes also called the frequency curve. The full width at half maximum (FWHM) for a Gaussian is found by finding the half-maximum points .

Method utilizing multi-scale multi-task convolutional neural network for population counting of stationary images

The invention discloses a method utilizing the multi-scale multi-task convolutional neural network for population counting of stationary images. According to the method, firstly, an inverse Gaussian density map is combined with an original Gaussian density map to form a combined density map; secondly, non-overlapping sampling of an input image is carried out to acquire several image sub-blocks, and the network is trained based on the image sub-blocks and corresponding true combined density maps thereof; overlapping sampling of the input image is carried out in the same pace, combined density maps of each image sub-block predicted by the MMCNN are superposed to reconstruct the combined density map of a complete crowd image, and population counting is realized. For the problem of populationscale difference, learning characteristics of different scale networks are measured through a fractional loss function, moreover, the population combined density map, the density level and foreground / background classification are simultaneously predicted in a multi-task mode, estimation accuracy of the combined density map is improved, and thereby an uneven population density problem is ameliorated.
Owner:CHANGZHOU UNIV

Clustering system and method for blade erosion detection

A system and method for detecting erosion in turbine engine blades is provided. The blade erosion detection system includes a sensor data processor and a cluster analysis mechanism. The sensor data processor receives engine sensor data, including exhaust gas temperature (EGT) data, and augments the sensor data to determine sensor data residual values and the rate of change of the sensor data residual values. The augmented sensor data is passed to the cluster analysis mechanism. The cluster analysis mechanism analyzes the augmented sensor data to determine the likelihood that compressor blade erosion has occurred. Specifically, the cluster analysis mechanism performs a 2-tuple cluster feature analysis using Gaussian density functions that provide approximations of normal and eroded blades in a turbine engine. The 2-tuple cluster feature analysis thus provides the probability that the sensor data indicates erosion has occurred in the turbine engine.
Owner:HONEYWELL INT INC

Improved particle filtering method based on niche genetic algorithm

The invention relates to an improved particle filtering method based on the niche genetic algorithm. The method comprises the following steps of: (1) sampling based on the initial probability distribution to obtain initial particles and setting the initial weight; (2) based on the filtering estimations of M particles at (k-1)th moment, carrying out EKF or UKF on each sampled particle to obtain the mean value and the covariance matrix corresponding to the kth moment, and respectively sampling n particles from each disposal distribution by using Gaussian density as the proposal probability density and using the mean value and the covariance matrix of each particle as the mean value and the covariance matrix of the distribution to obtain a set formed by nM particles; wherein n and M are natural numbers; (3) respectively updating the weights of the Nm particles to obtain the weight of each particle; and (4) when the obtained particle set has particles are less than the effective sample capacity, resampling with the niche genetic algorithm. The invention improves the particle filtering, inhibits the degeneracy phenomena and the particle-lack problem caused by simple random resampling, and improves the diversity and the adaptability of the particles, thereby improving the performance accuracy of the particle filtering.
Owner:BEIHANG UNIV

Reservoir classification method based on nuclear magnetic resonance logging

The invention discloses a reservoir classification method based on nuclear magnetic resonance logging, comprising the steps of: obtaining a nuclear magnetic resonance transverse relaxation time T2 spectrum of a depth point to be classified of a reservoir to be classified; calculating the nuclear magnetic resonance porosity of the depth point to be classified of a reservoir to be classified in dependence on the nuclear magnetic resonance T2 spectrum; employing a doublet Gaussian density function to fit the nuclear magnetic resonance T2 spectrum to obtain parameters representing pore structure characteristics of the depth point to be classified of a reservoir to be classified; employing a cluster analysis method to clarify the depth point to be classified of a reservoir to be classified in dependence on the nuclear magnetic resonance porosity of the depth point to be classified of a reservoir to be classified and the parameters representing pore structure characteristics of the depth point to be classified of a reservoir to be classified; and determining the reservoir type of the reservoir to be classified in dependence on the classification result of the depth point to be classified of a reservoir to be classified. The technical scheme provides strong technical support for accurate divide and reasonable development of a reservoir type.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)

Objective non-reference image quality evaluation method based on independent subspace analysis

The invention discloses an objective non-reference image quality evaluation method based on independent subspace analysis. The method comprises steps that, 1, independent subspace analysis on mass original images in a widely-known database is carried out to obtain a series of relatively independent image characteristics, histogram distribution statistics is carried out, and an edge distribution statistics curve is obtained by employing generalized Gaussian density (GGD) model and is taken as a benchmark reference; 2, image characteristics of to-be-measured distorted images are extracted based on independent subspace analysis, and the GGD model is employed to obtain statistics distribution of the characteristic information; and 3, the distorted image characteristic information statistics distribution obtained through processing and benchmark reference statistics distribution are contrasted, and European style distances corresponding to all integrated characteristic information are measured and accumulated and are taken as quality tolerance of the to-be-measured distorted images. Through the method, objective image quality evaluation and subjective evaluation have good consistency, and the method has better performance compared with traditional image quality evaluation methods.
Owner:ZHEJIANG UNIV

Method and system for optimizing technological parameters of aluminum-zirconium-carbon sliding plate and electronic equipment

The invention relates to the field of intelligent manufacturing design, and particularly discloses a technological parameter optimization method and system for an aluminum-zirconium-carbon sliding plate and electronic equipment. According to the method, a context-based encoder model is adopted to carry out context encoding on physical performance parameters of the aluminum-zirconium-carbon slide plate prepared after a certain component in a preparation formula of the aluminum-zirconium-carbon slide plate is changed so as to obtain global physical parameter associated information, and distribution of data in a high-dimensional feature space is further corrected by utilizing a Gaussian density map; in this way, the parametric feature vectors are properly fused, so that the feature distributions can converge on the profile relative to each other. Meanwhile, on this basis, an image of a microstructure is introduced as a medium to improve the incidence relation among the parameters, and the accuracy of a decoding regression result is higher based on responsiveness estimation of a Gaussian density map, so that the optimal granularity and the optimal content of the silicon powder are determined through an artificial intelligence algorithm, and the accuracy of the decoding regression result is improved. Therefore, the finally sintered aluminum-zirconium-carbon material has better physical and chemical properties.
Owner:ANSHAN CHOSUN REFRACTORIES

Method and system for detecting punching forming of lead frame plastic package integrated circuit

The invention relates to the field of lead frame plastic package integrated circuits, and particularly discloses a method and a system for detecting punching forming of a lead frame plastic package integrated circuit. According to the method, a convolutional neural network model is adopted to extract high-dimensional features of an induction matrix from an array transmission type photoelectric sensor and a regression reflection type photoelectric sensor, and meanwhile, a Gaussian density map is adopted to fuse a first feature map and a second feature map; and further, gradually simplifying the three-dimensional Gaussian density map by using a Gaussian mixture model, and comprehensively training a convolutional neural network by using a density map simplification loss function value and a classification loss function value, thereby helping the convolutional neural model to learn consistent feature representation in high-dimensional features. Therefore, the abnormity can be better detected, so that the equipment is protected, and the yield of products is ensured.
Owner:瑞安市和乐电子科技有限公司

Real-time track obstacle detection method based on three-dimensional point cloud

PendingCN113378647AEfficient identificationDetermine the safe driving space areaImage enhancementImage analysisVoxelPoint cloud
The invention discloses a real-time track obstacle detection method based on a three-dimensional point cloud, and the method comprises the steps: carrying out the processing of three-dimensional point cloud sequence data collected by a laser radar, firstly carrying out the coordinate transformation of the point cloud, converting the coordinates in a European coordinate system into the coordinates in a spherical coordinate system, putting each point in the point cloud into a certain voxel of a cone by using a cone voxelization down-sampling method so as to reduce the calculation amount of subsequent steps; inputting the downsampled points into a local feature coding module, searching local point clouds by using K-nearest neighbor (KNN), aggregating geometric features of the local point clouds, and connecting the centroid, neighbor point coordinates, relative coordinates and Gaussian density features of the local point clouds into a vector; connecting all local point cloud information into a matrix through traversal, and obtaining high-dimensional local feature information of each local point cloud through MLP and maximum pooling; and finally, utilizing multi-scale three-dimensional sparse convolution to realize track real-time identification of a single-frame image through a plurality of down-sampling and up-sampling modules.
Owner:ZHEJIANG UNIV OF TECH

Electric power system noise self-adaptive robust state estimation method

The invention provides an electric power system noise self-adaptive robust state estimation method. The method comprises the following steps that 1, L measuring fracture surfaces are obtained, wherein the L is an integer; 2, measuring error estimation is conducted on each measuring fracture surface to obtain the error vector; 3, the statistical learning method is used for carrying out estimation to obtain the parameters of a general Gaussian density model GGD on the basis of the error vector obtained through the estimation of the L measuring fracture surfaces to obtain the distribution type of measured noise, and the best corresponding robust state estimation model is selected according to the distribution type of the measured noise. According to the electric power system noise self-adaptive robust state estimation method, due to the fact that the distribution rules of the noise can be obtained through the statistical learning process, and the distribution rules of the noise are matched with the robust state estimation method in an on-line mode, so that the self-adaptive effect of various kinds of noise types is achieved, namely, the best estimation result which is closer to the state variable true value can be obtained in any noise distribution type.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1

Visual vibration amplification method, visual vibration detection method and visual vibration detection system based on morphological component analysis

The invention discloses a visual vibration amplification method, a visual vibration detection method and a visual vibration detection system based on morphological component analysis, and belongs to the technical field of computer vision. The method comprises: acquiring a video file comprising a target object, and determining a region of interest of the target object in each frame of image in the video file; adopting a quality factor adjustable wavelet dictionary and a discrete sine and cosine dictionary to respectively represent a structure component and a texture component of each frame of video; adopting a threshold selection algorithm based on generalized Gaussian density distribution to determine thresholds of the structural components; separating an image structure component and a texture component by adopting a self-adaptive MCA; according to the separated structure components, in combination with the Euler visual angle principle, achieving amplification of micro-vibration signals, reconstructing an amplified video, meanwhile, extracting visual vibration signals for the structure components, and achieving measurement of multiple vibration frequencies.
Owner:HEFEI UNIV OF TECH

Interactive yield optimization method and system based on recurrent neural network

The invention discloses an interactive yield optimization method and system based on a recurrent neural network, belongs to the technical field of chemical reaction yield optimization, and aims to solve the technical problem of how to obtain a relatively high chemical reaction yield on the premise of reducing the experiment cost. Comprising the following steps: acquiring various experimental condition parameters; simulating a current chemical reaction through a mixed Gaussian density function to obtain a reaction yield; constructing a chemical reaction model based on the recurrent neural network model; and initializing a historical data set, training the chemical reaction model by taking the encoded experimental condition parameters and the corresponding chemical reaction yield as current experimental condition parameters and corresponding reaction yield, outputting experimental condition parameters of the next round as target experimental parameters, and performing a chemical experiment based on the target experimental condition parameters. The obtained reaction yield is used as a target reaction yield; and under the condition that the target reaction yield reaches a threshold value, carrying out multiple rounds of training on the chemical reaction model.
Owner:烟台国工智能科技有限公司

Lithium ion battery SOC estimation method and device

The embodiment of the invention provides a lithium ion battery SOC estimation method and device. The method comprises the following steps: determining a mapping relationship between each model parameter and an SOC value in a battery equivalent circuit model; running at least two Kalman filters in parallel, and establishing a battery discrete state space model in combination with the battery equivalent circuit model and the mapping relationship between each model parameter and the SOC value; and estimating the SOC value of the battery discrete state space model through Gaussian and Kalman filtering algorithms. According to the lithium ion battery SOC estimation method provided by the embodiment of the invention, a plurality of Kalman filters can be combined in the form of different weight coefficient proportions, and finally, the SOC value of the battery discrete state space model is estimated through Gaussian and Kalman filter algorithms to obtain the optimal SOC estimation value, so that the SOC estimation accuracy of the battery discrete state space model is improved. Equivalently, a plurality of Gaussian density functions are adopted to accurately describe the process noise andthe measurement noise in the whole process according to a certain weight coefficient, so that the accuracy of the SOC estimation result is greatly improved, and the universality is high.
Owner:CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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