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47 results about "Gaussian sampling" patented technology

The Gaussian sampling strategy follows some of the same motivation for sampling on the boundary. In this case, the goal is to obtain points near by using a Gaussian distribution that biases the samples to be closer to , but the bias is gentler, as prescribed by the variance parameter of the Gaussian.

Binocular stereo matching method based on edge information

The invention discloses a binocular stereo matching method based on edge information. Firstly, performing color conversion on a left image and a right image acquired by Gaussian sampling through a Gaussian color model, introducing gradient information, using a neighborhood median as a threshold to replace a central pixel of a window, and counting the number of different corresponding bits in a Census transform value by using a Hamming distance so as to obtain a matching cost amount; secondly, converting the acquired image into an undirected graph, performing gradient operation by using a weighting function, constructing a minimum spanning tree, and performing cost aggregation by combining a cross-scale cost aggregation method to obtain a parallax value; generating a disparity map accordingto the obtained disparity value by using a winner-king strategy; and finally, carrying out region division on the pixel points by utilizing a super-pixel segmentation algorithm, and carrying out optimization processing on the disparity map by combining weighted median filtering, so that disparity information with relatively high precision can be obtained, and particularly, a relatively accurate disparity map can be obtained in an occlusion region and an edge information discontinuous region.
Owner:GUILIN UNIV OF ELECTRONIC TECH

Image rain removing method based on multi-scale progressive fusion

The invention discloses an image rain removal method based on multi-scale progressive fusion. The method comprises pyramid decomposition of a rain image, relevance learning of rain stripes, and progressive fusion and reconstruction of multi-scale features. In the pyramid decomposition process of the rain image, Gaussian sampling operators of different scales are utilized to perform sampling decomposition on the original rain image; in the correlation learning process of the rain stripes, learning global texture feature correlation is learned by using a non-local network; in the progressive fusion and reconstruction process of the multi-scale features; the multi-scale pyramid network is used for processing the features of the corresponding scales, and meanwhile, the multi-scale rain stripeinformation is gradually fused to assist the feature expression of the highest pyramid layer, so that the multi-scale fusion of the rain stripe information is realized, the residual rain image is reconstructed, and the residual image is subtracted from the rain image to obtain the rain-free image. According to the method, tThe correlation between the rain stripes in the same-scale image and the rain stripes in different-scale images is effectively utilized, the rain stripes are more accurately modeled, and a better rain removal effect is achieved.
Owner:WUHAN UNIV

Seven-degree-of-freedom redundancy mechanical arm task constraint path planning method under Descartes space

ActiveCN110653805ASolve the problem that the optimization of the terminal trajectory cannot be guaranteedProgramme-controlled manipulatorJointsSimulationControl theory
The invention provides a seven-degree-of-freedom redundancy mechanical arm task constraint path planning method under a Descartes space, and relates to a redundancy mechanical arm task constraint pathplanning technology. A collision-free path is planned for a seven-degree-of-freedom mechanical arm end executor in the Descartes space for achieving task constraint, and the problem that an existingplanning method is mostly and only suitable for joint space planning, but can not ensure optimization of the end track is solved. According to the seven-degree-of-freedom redundancy mechanical arm task constraint path planning method under the Descartes space, an improved FMT* planning algorithm is adopted in the Descartes space, and the end collision-free path meeting the task constraint is planned out for a mechanical arm, so that the optimization of the end track is achieved, and the movement reasonability of the mechanical arm is ensured. The method comprises the steps that a description method of a mechanical arm end constraint position space based on a task function under the Descartes space is provided, Gaussian sampling is used for replacing a sampling scheme of an original algorithm, distance measurement based on the previous constraint position space is put forward, and the effectiveness of a sampling point and the effectiveness of local connection are judged with the adoption of a mode based on arm configuration description.
Owner:XIAN UNIV OF SCI & TECH

Encryption method for error learning problem in ring domain and circuit

The invention discloses an encryption method for an error learning problem in ring domain and a circuit. The method comprises the following steps: sampling a polynomial and a noise polynomial and performing the number-theory transformation; operating the result after the number-theory transformation, obtaining a public key and a ciphertext, and completing the encryption of the to-be-encrypted information. The invention also discloses a circuit to realize the method and the circuit comprises: an encryption controller, a to-be-encrypted information storage device, a Gaussian sampling module, a read-only storage device, a Gaussian data storage module, a number-theory conversion processor, an iterative modular multiplication module and a ciphertext storage module. The Gaussian sampling module samples and generates a polynomial and a noise polynomial; the number-theory conversion processor is used to perform the number-theory transformation to the polynomial, the noise polynomial and the constant polynomial and to generate the ciphertext after operations on the to-be-encrypted information, the noise polynomial and the public key. The method and the circuit of the invention greatly increase the operational efficiency of the circuit, reduce the loss of the circuit, and ease the realization cost of an encryption circuit for the error learning problem in ring domain.
Owner:HUAZHONG UNIV OF SCI & TECH

Long-time target tracking method based on depth detection

ActiveCN111274917AAlleviate the problem of imbalance between positive and negative samplesInternal combustion piston enginesCharacter and pattern recognitionInformation processingAlgorithm
The invention discloses a long-time target tracking method based on depth detection, and belongs to the field of pattern recognition and intelligent information processing. According to the method, anMDNet depth detection tracking framework is adopted, and the problem of imbalance of positive and negative samples during sampling is solved by improving a shrinkage loss function on the basis of difficult-to-separate sample mining; designing and maintaining a high-confidence reserved sample pool during online tracking, reserving a first-frame target and high-confidence result sample characteristics, and performing online training by utilizing the reserved sample pool to update model parameters; and finally, calculating confidence coefficients of candidate samples obtained by Gaussian sampling around the target position of the previous frame through the model so as to track the position of the moving target and maintain the robustness of the model through effective updating. According tothe method, excellent tracking precision and success rate are kept in a complex long-term tracking environment, the target position can be accurately positioned when the target is shielded and reappears after the view, and the design requirement of an actual engineering system is met.
Owner:JIANGNAN UNIV

Texture surface defect detection method and system based on abnormal synthesis and decomposition

ActiveCN112700432ASolve the problem of small defect sample sizeImprove defect detection accuracyImage enhancementImage analysisImaging processingRadiology
The invention discloses a texture surface defect detection method and system based on abnormal synthesis and decomposition, and belongs to the field of image processing. According to the method, a segmentation-guided defect generation network is constructed, a large number of defect samples similar to real defects can be generated by using a small number of real defect training samples, and meanwhile, an anomaly synthesis method based on Gaussian sampling is provided, and anomaly negative samples can be randomly synthesized by using defect-free positive samples, so that the problem of small quantity of defect samples in industry can be solved; the defect detection precision is further improved; according to the method and system, the abnormal negative sample is decomposed into the texture background image and the abnormal mask image by adopting the abnormal decomposition network, so that defects can be effectively prevented from being reconstructed into the texture background, the texture background reconstruction precision is improved, the defect area can be accurately segmented, and the residual image and the abnormal segmentation image are fused; therefore, the defect detection rate is improved, and the defect over-detection rate is reduced.
Owner:HUAZHONG UNIV OF SCI & TECH

Self-adaptive super-resolution method based on meta transfer learning

The invention provides a self-adaptive super-resolution method based on meta transfer learning, which comprises the following steps: pre-training a self-adaptive super-resolution model based on meta transfer learning through an external image data set, so that the model can learn prior information of image reconstruction; performing random parameter down-sampling on images in the external image data set through a random Gaussian sampling method, so that training data in a meta transfer learning process contains multi-task information; performing down-sampling on a to-be-reconstructed target low-resolution image to obtain a low-resolution sub-image, and training the model by taking the low-resolution image and the low-resolution sub-image as training data; performing adversarial training by means of a twin neural network and the model, and adjusting model parameters by comparing the difference between a low-resolution image and a low-resolution sub-image to complete model training; and applying the model to a target image to reconstruct and generate a super-resolution image. According to the method, the image reconstruction quality can be improved, and the generalization ability of the super-resolution model is enhanced.
Owner:WEIHAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER COMPANY

Weak and small target joint detection and tracking system and method based on random finite set

The invention provides a weak and small target joint detection and tracking system and method based on a random finite set, and the system comprises: an infrared image measurement module which is usedfor obtaining an infrared measurement image of a ground environment and a target, thereby obtaining a target measurement domain; the target prediction module that is used for calculating a target measurement domain to obtain a target prediction state and a target prediction track label, and performing Gaussian sampling; the target updating module that is used for calculating a likelihood function, and calculating to obtain an updating state of the target and a target updating track label according to the likelihood function; and a hypothesis cost function associated with the target and measurement is built, and a hypothesis corresponding to the maximum weight is selected according to the hypothesis weight to obtain a target state and a track estimation value at the current moment. According to the invention, on the basis of obtaining target infrared measurement in a complex environment, effective detection and tracking of an infrared weak and small target in a complex noise environment are realized through measurement difference, self-adaptive extraction of a new target and optimal track allocation.
Owner:XI AN JIAOTONG UNIV

Multiple-scale quantum harmonic oscillator multi-mode function optimization system and method

InactiveCN105550787AImplement searchAchieve optimizationForecastingFunction optimizationQuantum harmonic oscillator
The invention relates to the calculation intelligent field and particularly relates to a multiple-scale quantum harmonic oscillator multi-mode function optimization system and a method. The invention improves the optimal position selection strategy of the current MQHOA method, all gauss sampling areas perform comparison on function values by targeting the sampling points generated by itself and the position of the optimal value is reserved as a new gauss sampling center. In the meantime, the convergence condition of the innermost loop is changed to the condition where the difference of the variance of all gauss sampling center positions between two iterations is smaller or equal to the current scale, and the QHO (quantum harmonic oscillator iteration ) performs internal layer circulation convergence. In the invention, the essence of the QHO convergence condition is to perform convergence when the change of each gauss sampling area position is small. The invention can realize the optimization problem of the complex function of the multi-global optimal position. For the complex functions having the multi-global optimal position, the method disclosed by the invention can perform convergence in most of time and thus realizes the search for the multiple global optimal positions.
Owner:SOUTHWEST UNIVERSITY FOR NATIONALITIES

Material strength distribution obtaining method

The invention provides a material strength distribution obtaining method. The method comprises the steps of obtaining multiple material strength samples defined in the specification through a materialstrength test, and determining test data-based strength random variable samples defined in the specification; expanding a strength random variable eta by adopting a chaotic polynomial, and accordingto Gaussian sampling, performing calculation to obtain all-order chaotic polynomial basis function samples defined in the specification; by adopting a Markov chain-Monte Carlo algorithm, obtaining posteriori distribution samples, defined in the specification, of all-order chaotic polynomial coefficients gamma; according to the reconstructed chaotic polynomial coefficient samples defined in the specification and the chaotic polynomial basis function samples defined in the specification, determining posteriori distribution samples, defined in the specification, of the strength random variable; and according to the posteriori distribution samples, defined in the specification, of the strength random variable, calculating posteriori distribution samples, defined in the specification, of strength, and finally obtaining material strength distribution by adopting an interval statistics method. According to the method, the material strength distribution can be obtained by only finishing few strength tests, without assuming a material strength distribution type, so that a large amount of test time and expenditures are saved, and meanwhile, an error caused by wrong selection of a material strength distribution model is avoided.
Owner:SOUTHEAST UNIV

Digital media protection text steganography method based on variational automatic encoder

PendingCN113987129AAchieving visual indistinguishabilityAchieving statistical indistinguishabilitySemantic analysisNeural architecturesPattern recognitionNetwork model
The invention belongs to the field of information security, and particularly relates to a digital media protection text steganography method based on a variational automatic encoder. The method comprises the following steps: constructing a neural network model consisting of an encoding network, Gaussian sampling and a decoding network, and vectorizing a text; utilizing the encoding network to respectively obtain features of global keywords and a long sequence, and fusing the features of the global keyword and the long sequence to obtain global feature representation; carrying out Gaussian sampling on the global feature representation in the encoding network by using Gaussian sampling; decoding a sampling result of Gaussian sampling by using the decoding network to obtain conditional probability distribution of the text; selecting k words with the maximum conditional probability, selecting a word corresponding to a secret bit stream through Huffman coding, and completing steganography of a file. According to the method, long and diverse steganographic texts can be generated, so that the steganographic texts can carry more secret information, and visual indistinguishability, statistical indistinguishability, and semantic indistinguishability of natural languages and the steganographic texts are realized.
Owner:CHONGQING UNIV OF POSTS & TELECOMM

System and method for joint detection and tracking of weak and small targets based on random finite sets

The present invention provides a weak and small target joint detection and tracking system and method based on random finite sets, including an infrared image measurement module, which is used to obtain infrared measurement images of the ground environment and targets, thereby obtaining target measurement domains; target prediction The module is used to calculate the target measurement domain to obtain the predicted state of the target and the predicted track label of the target, and then perform Gaussian sampling; the target update module is used to calculate the likelihood function, and calculate the updated state of the target according to the likelihood function Update the track label with the target; and establish a hypothetical cost function associated with the target and measurement, select the hypothesis corresponding to the maximum weight according to the hypothetical weight, and obtain the target state and track estimated value at the current moment. The invention provides the basis of acquiring target infrared measurement in a complex environment, through measurement difference, self-adaptive extraction of newborn targets, and optimal allocation of track, to realize effective detection and tracking of weak and small infrared targets in a complex noise environment .
Owner:XI AN JIAOTONG UNIV
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