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63 results about "Low rank matrix decomposition" patented technology
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Collaborative recommendation method based on social context
InactiveCN102231166AImprove efficiencyOvercoming the problem of inaccurate recommendation resultsSpecial data processing applicationsQR decompositionRating matrix
The invention discloses a collaborative recommendation method based on social context regularization. The collaborative recommendation method comprises the following steps of: 1) firstly, extracting a user object matrix and a socialization relation matrix, wherein during the collaborative recommendation, the user object matrix is defined by using a grading matrix of a user on an object, a clicking frequency of the user on the object or a visit relation, and the socialization relation is a relation, generated by some behaviors of the user, between the user and other users in the system; 2) filling the user object matrix by using a low-rank matrix decomposition method with the social context regularization and recommending N objects to each user by using a result matrix; and 3) adjusting the weight of the social context restraint during matrix decomposition in the consideration of difference among different users. By the method, the problems of single recommended information of the conventional collaborative filtering recommendation algorithm and inaccurate recommendation result caused by dilution of the user object matrix are solved; furthermore, compared with the conventional method, the method has the advantage of obviously enhancing the recommendation result accuracy.
Owner:ZHEJIANG UNIV
Hyperspectral image denoising method based on non-convex low rank matrix decomposition
InactiveCN106709881ANoise removal is fastReduce running timeImage enhancementImage analysisImage denoisingLow rank matrix decomposition
The present invention discloses a hyperspectral image denoising method based on non-convex low rank matrix decomposition. The method comprises the following steps: 1. dividing a hyperspectral image; 2. generating a matrix; 3. carrying out nonconvex low rank matrix decomposition; 4. restoring the sub-block; and 5. restoring the hyperspectral image, and finally obtaining the denoised hyperspectral image. According to the method disclosed by the present invention, a method for efficiently and quickly removing multiple kinds of noises is provided for the remote sensing hyperspectral image denoising.
Owner:SHANGHAI ZENGRONG DATA TECH CO LTD
Non-local image denoising method based on low rank restoration
InactiveCN106934775APreserve True Edge StructureEfficient separationImage enhancementImage analysisHadamard transformPattern recognition
The invention discloses a non-local image denoising method based on low rank restoration. The method comprises the steps of (1) collecting an image, (2) carrying out gray transformation on the collected image, (3) establishing a three-dimensional similarity matrix through the global search of a similar pixel block for the image which is subjected to gray transformation, then carrying out hard threshold filtering on the discrete cosine transform and Hadamard transform coefficients of the three-dimensional matrix is carried out, obtaining the initial estimation of the similar pixel block with the removal of partial noise, and improving the matching accuracy of the similar pixel block with low rank restoration denoising while removing a large part of noise, and (4) with transform domain filtering as prior knowledge, searching a similar pixel block in a search area for an initially denoised reference pixel block, then forming the similarity matrix by using a similarity block corresponding to an original image, carrying out low rank matrix decomposition on the similarity matrix, effectively separating noise and a signal, and obtaining a final denoised image. The method has the advantages of a simple and fast algorithm, a high signal-to-noise ratio and good consistency and is especially suitable for the requirements of high quality noise reduction of large-scale images.
Owner:OCEAN UNIV OF CHINA
Target prospect collaborative segmentation method combining significant detection and discriminant study
The invention discloses a target prospect collaborative segmentation method combing significant detection and discriminant study. The method comprises the steps as follows: step one, each image in an image set is divided into a plurality of superpixel blocks, and characteristics of each superpixel block are extracted; step two, an image concentrated and shared significant area in the image set is extracted to serve as a target prospect, a non-significant area and an area which has significance but is not the image concentrated and shared area are taken as a background area, low-rank matrix decomposition is adopted to perform significant detection on the images, and logistic regression is adopted to select the shared significant area as a final target. According to the target prospect collaborative segmentation method combing significant detection and discriminant study, the significant area can be effectively detected by means of the low-rank matrix decomposition, the influence of background consistency is removed, and by means of the discriminant study, the shared and significant area can be extracted; the low-rank matrix decomposition and the discriminant study process are combined and optimized under the unified framework, are mutually influenced and are commonly promoted; and finally, the shared and significant area can be obtained to serve as the target prospect area.
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI
Heart magnetic resonance imaging (MRI) image deblurring method based on sparse low rank and dictionary learning
ActiveCN103093430AMotion Blur Kernel AccurateAvoid distortionImage enhancementDictionary learningPattern recognition
The invention discloses a heart magnetic resonance imaging (MRI) image deblurring method based on sparse low rank and dictionary learning. The heart MRI image deblurring method mainly solves the problem that beating of a heart causes the quality reduction of a heart MRI image. The realization process of the heart MRI image deblurring method includes the steps: inputting a heart MRI image; carrying out sparse low rank matrix decomposition on the heart MRI image, and obtaining a sparse part and a low rank part of the image; selecting a sub window from the sparse part of the image; estimating motion blur kernel in the sub window through a method of self-adaption dictionary learning; carrying out deconvolution operation on the heart MRI image through utilization of the estimated motion blur kernel, and obtaining a clear heart MRI image. The heart MRI image deblurring method has the advantages of accurately estimating the motion blur kernel, and the distortion of image deblurring results due to inaccuracy of estimation of the motion blur kernel is avoided.
Owner:XIDIAN UNIV
Sea-surface infrared small object detection method
InactiveCN105931264AAvoid interferenceReduce computational costImage enhancementImage analysisNon localBackground image
The invention discloses a sea-surface infrared small object detection method. The method comprises the steps that (1) a non-local block is used to construct a new image matrix by decomposing an original image matrix into superposed subblocks, expanding the subblocks into column vectors and combining the column vectors to obtain the new image matrix; (2) sparse and low-rank matrix decomposition is carried out by decomposing the constructed new image matrix into sparse small object components, low-rank background image components and noise components; (3) a convex optimization model is established by constructing a convex optimization constrained energy function related to small object and background images; (4) high-efficiency optimized solution is carried out by solving the constructed convex optimization constrained energy function in an alternative direction multiplier method in which parameters are updated adaptively in high efficiency; and (5) the small object image of interest is obtained by iteration. The detection method provided by the invention is low in calculation cost, high in parameter adaption, high in detection efficiency, and capable of resisting background noises and clutter interference, and can be applied to infrared small-object detection in complex sea-surface background.
Owner:XIDIAN UNIV +1
Article topic keyword extraction method and apparatus based on low-rank matrix decomposition
InactiveCN105912524ASolve the sparsity problemReduce distractionsSemantic analysisSpecial data processing applicationsAugmented lagrange multiplierDecomposition problem
Embodiments of the present invention provide an article topic keyword extraction method and apparatus based on low-rank matrix decomposition. The method mainly comprises training an article text after data pre-processing by using a tool representing words as real-value vectors, obtaining a word vectorization file, extracting keywords of each event of a specific topic in the article text after data pre-processing by using a keyword extraction algorithm based on a text graph model, querying the word vectorization file according to the extracted keywords, and establishing a keyword matrix of the specific topic; and solving the low-rank decomposition problem of the keyword matrix by using an augmented lagrange multiplier algorithm, obtaining a keyword low-rank matrix, and finally generating the keywords of the specific topic in the article text after data pre-processing. The keywords of article topics in microblogs are generated by using the low-rank matrix decomposition method, the sparsity problems of the article topic keywords in microblogs is effectively solved, and interference of non-keyword data noise is largely reduced.
Owner:BEIJING JIAOTONG UNIV +1
Solar cell defect detection method integrating short-time and long-time depth characteristics
ActiveCN110222784AImprove versatilityImprove accuracyCharacter and pattern recognitionOptically investigating flaws/contaminationFeature extractionThree dimensional matrix
The invention provides a solar cell defect detection method integrating short-time and long-time depth characteristics. The method comprises the following steps: preprocessing; performing short-time depth feature extraction, including blocking and vectorizing the preprocessed images and then sending the images into a stacked noise reduction automatic encoder to be trained; obtaining a two-dimensional adaptive depth feature matrix learned by all image blocks, and converting the two-dimensional adaptive depth feature matrix into a three-dimensional matrix to obtain a short-time depth feature composed of current image observation information; extracting long-time depth features; integrating and converting the short-time depth feature and the long-time depth feature; and performing low-rank matrix decomposition and post-processing to obtain a final detection result. According to the method, the defect of the solar cell is characterized by using the depth characteristics fusing the currentimage observation information and the priori knowledge, so that the universality and accuracy of the defect detection of the solar cell can be remarkably improved, the calculation amount is small, thedetection efficiency is high, and the positioning precision is relatively high.
Owner:ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
Robust direction of arrival (DOA) estimation method based on sparse and low-rank recovery
ActiveCN110045321AError parameter ηImprove estimation performanceDirection findersHigh level techniquesEstimation methodsFactor selection
The invention belongs to the field of signal processing, and particularly relates to a robust direction of arrival (DOA) estimation method based on sparse and low-rank recovery. According to the technical scheme, firstly, based on a low-rank matrix decomposition method, a received signal covariance matrix is modeled as the sum of a low-rank noise-free covariance matrix and a sparse noise covariance matrix; then the convex optimization problem about a signal and noise covariance matrix is constructed based on a low-rank recovery theory; then a convex model about the sampling covariance matrix estimation error is constructed, and a convex set explicitly includes the convex optimization problem; and finally, based on the obtained covariance matrixes, DOA estimation is achieved through a MVDRmethod. In addition, based on the statistical characteristic that the sampling covariance matrix estimation error submits to progressive normal distribution, an error parameter factor selection criterion is derived to reconstruct the covariance matrixes. Numerical simulation shows that under the limited sampling conditions, compared with traditional CBF and MVDR algorithms, a proposed algorithm ishigh in DOA estimation accuracy and robust in performance.
Owner:DALIAN UNIVERSITY
Image synergistic significance area detection method
ActiveCN107358245AImprove accuracyImage enhancementImage analysisLow rank matrix decompositionVisual perception
The invention discloses an image synergistic significance area detection method and belongs to the computer vision technology field. The method comprises steps that S1, M significance detection methods are employed to carry out significance detection on N to-be-detected images to acquire M*N basic significance diagrams Sj; S2, a low rank matrix decomposition model having a Laplace regular item is utilized to decompose a histogram matrix formed by significance area color characteristics of the M*N diagrams to acquire weighted values of the basic significance diagrams Sj, and a weighted value of the Sj is acquired; S3, the weighted value of the Sj and the corresponding Sj are fused to acquire a weighted significance diagram Sc; S4, clustering processing on each to-be-detected image is carried out, the Sc is utilized to guide class synergistic significance distribution after clustering of the ith to-be-detected image to acquire a synergistic significance diagram Sd; and S5, the Sc and the Sd are fused to acquire the significance diagram S of the N to-be-detected images. The method is advantaged in that the Laplace regular item is added to the low rank matrix decomposition model, distinguishing accuracy of the low rank background and a coefficient matrix is improved, and detection efficiency of the synergistic significance area is further improved.
Owner:ANHUI UNIVERSITY
Low-rank decomposition and space spectrum constraint-based hyperspectral image time domain change feature extraction method
ActiveCN107609573AStrong Intraclass CorrelationHigh strengthCharacter and pattern recognitionComplex mathematical operationsTime domainMultiple forms
The invention relates to a low-rank decomposition and space spectrum constraint-based hyperspectral image time domain change feature extraction method. The method mainly comprises the following stepsof: calculating a difference image between two hyperspectral remote sensing images acquired at a same place and at different times; establishing a low-rank matrix decomposition model with a space spectrum constraint by utilizing internal data structural characteristics of the difference image; and solving each component of the model through an alternate iteration manner so as to extract a time domain change feature. According to the method, the low-rank matrix decomposition model with the space spectrum constraint and a solution algorithm of the model are disclosed by sufficiently utilizing internal structures of data, so that the time domain change feature is effectively extracted, multiple forms of noises are removed, real changes are strengthened and false changes caused by noises are suppressed, thereby improving the change detection precision of time domain change hyperspectral remote sensing images.
Owner:DONGHUA UNIV
Video sequence background recovery method based on online low-rank background modeling
ActiveCN106204477ARealize the solutionRealize online recoveryImage enhancementImage analysisRecovery methodRestoration method
The invention belongs to the video analysis field and aims at accurately recovering a video sequence background in an online mode. The invention discloses a video sequence background recovery method based on online low-rank background modeling. Based on traditional background modeling, low-rank matrix decomposition of a nuclear norm and motion information estimation of binaryzation are introduced so that a problem which can not be processed in the prior art can be solved. The method comprises the following steps of 1) specifically expressing a background recovery problem in a video sequence as following unrestraint optimization equation solving; 2) constructing a kth frame of motion mapping weight vector wk; 3) using an alternative direction method to solve; 4) solving ck<l+1>; 5) solving ek<l+1>; 6) repeating the above steps 4) and 5) till that algorithm convergence is achieved; 7) using variable substitution to solve; 8) solving Yk<l+1>; 9) solving Lk<l+1>; 10) repeating the above steps 8) and 9) till that the algorithm convergence is achieved; and 11) solving a video background. The method of the invention is mainly used for a video analysis occasion.
Owner:TIANJIN UNIV
Face recognition method based on discriminative non-convex low-rank decomposition and superposition linear sparse representation
ActiveCN110069978AEasy to handleIncrease incoherenceCharacter and pattern recognitionDecompositionHomotopy method
The invention discloses a face recognition method based on non-convex low-rank decomposition and superposition linear sparse representation. The method comprises the following steps: 1, according to alow-rank matrix decomposition theory, replacing a nuclear norm with a gamma norm for low-rank matrix decomposition, and introducing a structure incoherent discrimination item to form discriminative non-convex low-rank decomposition; 2, resolving the discriminative non-convex low-rank decomposition, and decomposing the face sample matrix into a low-rank matrix and a sparse matrix; 3, decomposing the low-rank matrix into prototype dictionaries and variation dictionaries through superposition linear representation, and then using the two dictionaries as dictionaries for testing through linear weighting combination; and 4, solving a sparse coefficient of l1 norm by using a homotopy method by using a sparse representation algorithm, carrying out classified recognition on the face images by reconstructing a minimum sparse residual model, and classifying the face samples to be tested into a class with a minimum error, thereby realizing face recognition. According to the method, good robustness and high efficiency can be maintained under the conditions of shielding and noise pollution.
Owner:HANGZHOU DIANZI UNIV
Hyperspectral image denoising method based on non-convex low-rank matrix approximation and total variation regularization
PendingCN112069919AAchieve sparse approximationImprove spatial segmentation smoothnessImage enhancementScene recognitionPattern recognitionImage denoising
The invention discloses a hyperspectral image denoising method based on non-convex low-rank matrix approximation and total variation regularization. The hyperspectral image denoising method comprisesthe following steps: 1) acquiring hyperspectral image data to be denoised, wherein M, N and K represent the number of width and height spectral bands of a hyperspectral image respectively; 2) constructing a denoising model based on non-convex low-rank matrix decomposition and TV regularization; (3) optimizing the model by adopting an Augmented Lagrange function (ALM) algorithm, and optimizing themodel by adopting an ALM algorithm; 4) optimizing and solving the model by adopting an augmented Lagrange function algorithm; and 5) outputting the hyperspectral image after the mixed noise is removed.
Owner:ZHEJIANG UNIV OF TECH
De-raining method of single image based on sparse and low-rank matrix decomposition
InactiveCN106971377ARealize rain removal operationAutomate processingImage enhancementImage analysisPattern recognitionDictionary learning
The invention provides a de-raining method of a single image based on sparse and low-rank matrix decomposition. The de-raining method is characterized in that the method comprises following steps: step 1, inputting a rain-containing image, decomposing the rain-containing image into 8*8 image blocks, taking the center of the image blocks as the origin, forming an input matrix by 8 image blocks with 4 of pixel deviation, and performing sparse and low-rank matrix decomposition on the input matrix, wherein a low-rank matrix is regarded as a low-frequency component, and a sparse matrix is regarded as a high-frequency component; step 2, dividing the high-frequency component into a plurality of mutually overlapped high-frequency sub-blocks, obtaining a dictionary by learning through a dictionary learning method, and dividing the dictionary into a rain portion dictionary and a geometric portion dictionary according to HOG characteristics; and step 3, dividing a high-frequency image into a plurality image sub-blocks which are not mutually overlapped after obtaining the rain portion dictionary and the geometric portion dictionary, adding geometric portions in a geometric component and a rain component, and forming a de-rained output image through merging, wherein each image sub-block is represented by the geometric component and the rain component.
Owner:SHANGHAI OCEAN UNIV
Multi-dimensional domain joint SAR broadband interference suppression method based on low-rank matrix decomposition
ActiveCN111239697AValid reservationAvoid the problem of useful signal lossRadio wave reradiation/reflectionImaging qualityImaging algorithm
The invention provides a multi-dimensional domain joint SAR broadband interference suppression method based on low-rank matrix decomposition. Broadband interference signals exist in a plurality of pulses of current echo data. The short-time Fourier transform matrixes of the pulse echo signals are vectorized respectively; RPCA decomposition is performed to obtain a low-rank matrix and a sparse matrix; each row of the decomposed sparse matrix is rearranged into a short-time Fourier matrix form; the rearranged short-time Fourier matrix is subjected to inverse short-time Fourier transform, the reconstructed interference signal is subtracted from the original echo signal to realize broadband interference suppression, and data subjected to interference suppression is imaged by using an existingimaging algorithm to obtain a high-resolution image. According to the method, the problem of useful signal loss caused by time-frequency filtering is avoided, compared with a traditional method basedon energy characteristic difference, useful signal information can be effectively reserved while interference is suppressed, and the image quality after broadband interference suppression can be improved to a large extent.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Robust image classification method and device based on low-rank two-dimensional local identification image embedding
ActiveCN111325275AImprove robustnessSolve the phenomenon that the recognition rate dropsCharacter and pattern recognitionImaging processingImage manipulation
The invention discloses a robust image classification method and device based on low-rank two-dimensional local identification image embedding, and the method comprises the steps: constructing an image library unit which is used for obtaining a standard image library, and constructing a new to-be-classified standard image library; the first calculation unit is used for calculating the difference J(P) between the intra-class divergence matrix Sw and the inter-class divergence matrix Sb of the new standard image to be classified; the first image processing unit is used for carrying out low-rankmatrix decomposition on the acquired image X to obtain a low-rank matrix A and a sparse matrix E; the second calculation unit is used for obtaining a final target function according to the combination of results of the first calculation unit and the first image processing unit; the feature matrix calculation unit is used for obtaining a feature matrix Y; and the nearest neighbor classifier unit is used for classifying the images by utilizing a nearest neighbor classifier and outputting a classification result of the images. According to the invention, the technical problems of low classification precision, noise points and singular points in the existing image classification based on the 2DLPP learning model are solved, and the identification precision is improved.
Owner:NANJING AUDIT UNIV
Noise-immunity three-dimensional positioning method for moving target in tunnel
ActiveCN108957395AEfficient handling of deletionsNot easy to spreadPosition fixationExpectation–maximization algorithmNODAL
The invention discloses a noise-immunity three-dimensional positioning method for a moving target in a tunnel. The positioning method comprises the steps that (1) beacon nodes, positioning identification cards and data transmission devices are laid according to the environment in the tunnel; (2) sensor nodes perform distance measurement based on an RSSI (Received Signal Strength Indicator) distance measurement method and converge the data to a data center, and an initial partially missing and noise containing Euclidean distance matrix is constructed; (3) mixed Gaussian distribution is introduced to fit unknown noise, a problem of complementing the partially missing Euclidean distance matrix under the complex environment in the tunnel is modeled into a noise-immunity low-rank matrix decomposition model, and the model is solved by adopting the classical expectation maximization algorithm; and (4) the real position of the moving target in the tunnel is calculated by adopting the classicalmulti-dimensional scaling algorithm based on the complemented inter-node real Euclidean distance matrix. The noise-immunity three-dimensional positioning method fully considers influences imposed onsensor node distance measurement by the complex environment in the tunnel, and can perform real-time accurate positioning on the moving target in the tunnel under various types of noise.
Owner:JIANGSU POWER TRANSMISSION & DISTRIBUTION CO LTD +4
A video image de-fog enhancement method based on improved convolution matching tracking pipeline
ActiveCN109087270AShorten the timeImprove accuracyImage enhancementImage analysisLow rank matrix decompositionConvolution
The invention relates to an improved convolution matching tracking pipeline video image defogging enhancement method. The fog layer model is obtained by processing the center circle in the video framein the pipeline, and the fog layer is used as the source of convolution dictionary to train the dictionary. The background image and foreground image are obtained by training the low rank matrix decomposition of the first few frames, the residual image is initialized according to the foreground image and the feature response is calculated through the residual image, the foreground reconstructed image is initialized, and the noise energy is calculated. Maximum search for feature response is performed; Reconstruction of foreground image using maximum value and current maximum feature response and updating feature response using maximum value are performed; the residual image is updated, and the residual image energy is calculated. If the residual image energy is less than the noise energy,the final defogging image is calculated. The invention can effectively obtain the fog layer model, and find the fog layer coincident with the video frame through the fog layer model as a convolution dictionary and remove the fog layer. the method can be used in pipeline video image enhancement and other scientific fields.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)
The invention discloses a dDefect detection method for a solar cell panel
InactiveCN109615612AReduce distortionHigh precisionImage enhancementImage analysisTelecentric lensSolar cell
The invention discloses a defect detection method for a solar cell panel, which is. realized through a measurement system formed by a test rack, a gray area array camera, a telecentric lens, an annular light source and an objective table and includesTest stand, Gray area array camera, A measurement system constructed by a telecentric lens, an annular light source and an objective table is realizedby the following steps of: shooting a picture of a solar cell panel, respectively carrying out expansion processing in horizontal and vertical directions, carrying out edge detection by adopting a canny operator, rotating the image by adopting Hough transformation, and repairing a cavity value of the rotated image; fFiltering and denoising, carrying out brightness equalization processing by adopting gamma correction, and uniformly segmenting the image; converting the segmented image into a matrix D by adopting a robust principal component algorithm, decomposing the matrix D into a low-rank matrix A and a sparse matrix E, and performing recovery processing on the matrix D according to an APG gradient approximation algorithm; and carrying out reverse returning operation on the low-rank matrix A and the sparse matrix E to a single wafer image, carrying out low-rank matrix decomposition technology processing to obtain a defective solar cell panel image, and then detecting a defect position.
Owner:SOUTH CHINA UNIV OF TECH
Damaged image repair method based on multi-view popular low-rank representation
ActiveCN103559683APromote recoveryImprove visual experienceImage enhancementComputer visionImage restoration
The invention provides a damaged image repair method based on multi-view popular low-rank representation. The following operations are carried out on a damaged image: firstly, the multi- type characteristic of the damaged image is extracted, and the multi-view representation of the damaged image is obtained; then the multi-view popular structure is constructed and used, the different local geometric structures of the damaged image are maintained, the damaged image is subjected to low-rank matrix decomposition, and the multi-view popular low-rank representation and damaged matrix representation of the image are obtained; finally the damaged image is repaired based on the integration of multi-view low-rank representations, and a complete original image is obtained. The method has the advantages that the multi-view compensation information and local popular structure characteristic of the damaged are fully considered, the clear and complete original image can be recovered well, the visual experience of a user is improved, and the method can be applied to the image restoration in the fields of biology, medicine, remote sensing and the like.
Owner:ZHEJIANG UNIV
Sign prediction method capable of considering local labelling characteristics of node
PendingCN106780067AFast operationImprove forecast accuracyData processing applicationsStochastic gradient descentNODAL
The invention provides a sign prediction method capable of considering the local labelling characteristics of a node. The method comprises the following steps that: S1: obtaining the form expression of a signed network; S2: analyzing the structural characteristics of the signed network, obtaining a relationship between the rank and structure balance of a network adjacent matrix and a weak structure balance theory, utilizing low-rank matrix decomposition to decompose a low-rank matrix, and meeting a constraint condition that a matrix rank is minimum; S3: according to the conclusion of the structural characteristics of the signed network, converting a sign prediction problem into an optimization problem; and S4: utilizing a stochastic gradient descent method to decompose the low-rank matrix to obtain network considering global characteristics.
Owner:NANJING VOCATIONAL UNIV OF IND TECH
Endoscopic image highlight removal method based on non-convex low-rank matrix decomposition
ActiveCN112508806ADesaturationAccurate detectionImage enhancementImage analysisAlgorithmThresholding
The invention provides an endoscopic image highlight removal method based on non-convex low-rank matrix factorization, which comprises the following steps: an absolute highlight detection stage: statistical attributes of an image on saturation and intensity values are calculated, an adaptive threshold is generated, a double-threshold segmentation algorithm is executed, absolute highlight pixels are detected, and an absolute highlight image is generated; a non-convex low-rank matrix decomposition stage: non-convex low-rank matrix decomposition is executed on each image, gradient information isintroduced in the iterative optimization process with the position information of absolute highlight pixels as priori knowledge, and a low-rank image and a sparse image are calculated; an image fusionand reconstruction stage: a finer highlight image is generated, morphological operation and linear filtering operation are executed, a self-attenuation weight image is generated, pixel-level fusion of a low-rank image and an original endoscope image is executed, and an endoscope image without highlight is generated; image blocking and integration: an original image with a large size is divided into a plurality of sub-images by adopting an image blocking technology, and multi-task parallel computing is realized by adopting a multi-thread technology.
Owner:BEIHANG UNIV
Noise-robustness image similarity distinguishing method
ActiveCN104794679AImprove robustnessEnsure the effectiveness of image processing methods such as denoisingImage enhancementImage analysisImage denoisingImage matching
The invention discloses a noise-robustness image similarity distinguishing method, and belongs to the field of digital image processing. By the noise-robustness image similarity distinguishing method, images with large noises can be matched with accurate image blocks, the image matching accuracy is improved, and image processing methods such as image stitching and image denoising which are based on block matching can be implemented. A noise-robustness similarity distinguishing function is established by a low-rank matrix decomposition theory which is rapidly developed recently, influences of irregular disturbance such as noises on similarity distinguishing are eliminated, and distinguishing effectiveness under the condition of large noises can be guaranteed.
Owner:NAT UNIV OF DEFENSE TECH
Speaker recognition method based on dictionary learning and low rank matrix decomposition
ActiveCN110265039AStrong recognition abilityEasy to identifySpeech analysisDictionary learningLow rank matrix decomposition
The invention provides a speaker recognition method based on dictionary learning and low rank matrix decomposition. Thespeaker recognition method comprises the following steps that step 1, speaker audiosare subjected to processing of pre-emphasis, framing, windowing, endpoint detection and the like; step 2, MFCC features corresponding tosentences of speakersare extracted, and a GMM-UBM model is trained; step 3, a global difference spatial matrix T and a global difference spatial factor w are estimated by joint factor analysis (JFA); step 4,i-vector of the sentences of each speaker is obtained; and step 5, the i-vector of the M dimension isextracted from a training set to form a feature matrix, and adistinguish dictionary isgenerated according to the training set and a test set, the obtained dictionary is taken as abackend processing and scoring moduleof thei-vector, anda basis isprovided for the final distinguish. Coding coefficients adapted to the dictionary learning criterion can effectively improve the recognition power, and optimal classification is carried out through structured sparseness.
Owner:NANJING UNIV OF POSTS & TELECOMM
Dual-mode image saliency detection method based on node classification and sparse graph learning
PendingCN113011438AEasy to detectGuaranteed accuracyImage enhancementImage analysisColor imageVisual technology
The invention discloses a bimodal image saliency detection method based on node classification and sparse graph learning, and belongs to the technical field of computer vision. According to the invention, the method comprises the steps: taking a thermal infrared image as an image channel of a color image to carry out superpixel segmentation, extracting color features and multilayer semantic features of each superpixel in a bimodal image, establishing a graph model, and then carrying out low-rank matrix decomposition on the color features of the two modal images, generating a corresponding low-rank matrix and a sparse matrix, and classifying graph model nodes; calculating an initial adjacency matrix according to a node classification distance and an Euclidean distance, and then carrying out sparse graph learning saliency sorting by using the initial adjacency matrix and an indication vector for many times to obtain a saliency graph. Compared with an existing saliency detection method, the method has the advantages that the detection precision is remarkably improved, the image saliency region can be well separated from the background, and the method still has good performance on images shot in a rain and fog environment and an environment with insufficient light.
Owner:NORTHEASTERN UNIV
Cooperative Segmentation Method of Object Foreground by Joint Saliency Detection and Discriminative Learning
Owner:INST OF AUTOMATION CHINESE ACAD OF SCI
Method for recovering dynamic video background based on the space-time joint matrix
PendingCN111626942ARealize online solutionSimple procedureImage enhancementImage analysisComputer graphics (images)Algorithm
The invention relates to video image processing, and aims to realize accurate background modeling of dynamic video stream data and improve the spatial expandability of a model, so that the dynamic video stream data can be applied to a high-resolution video. According to the technical scheme, a method for recovering the dynamic video background based on the space-time joint matrix comprises the steps that low-rank matrix decomposition is conducted on nuclear norm items of a constraint batch processing implementation mode, and a model is converted into a single-frame processing mode. Meanwhile,an affine transformation operator is embedded, iterative solving is conducted on the model through an alternating direction algorithm, in the solving process, the view angles of the videos are gradually unified, and dynamic video background recovery is achieved. The method is mainly applied to video image processing occasions.
Owner:TIANJIN UNIV
Product recommendation method and device, electronic equipment and computer readable storage medium
PendingCN112381620AHigh precisionImprove accuracyDigital data information retrievalFinanceLow rank matrix decompositionMatrix decomposition algorithms
The embodiment of the invention relates to the technical field of data processing, and discloses a product recommendation method and device, electronic equipment and a computer readable storage medium, and the product recommendation method comprises the steps: constructing a first score recommendation matrix between a user and at least one to-be-recommended financial product according to the related information of the user based on a collaborative filtering method algorithm, wherein the related information comprises personal basic information, scores of financial products and historical purchase information of the financial products; then, based on a low-rank matrix decomposition algorithm, constructing a second score recommendation matrix of the user and each financial product according to a purchase relationship between the user and each financial product; and then, calculating the score of each to-be-recommended financial product according to the first score recommendation matrix and the second score recommendation matrix, and recommending the corresponding to-be-recommended financial product to the user according to the scores. According to the method, the user characteristicsand the product characteristics are fully considered, and the financial product recommendation precision and accuracy are greatly improved.
Owner:CHINA CITIC BANK
Millimeter-wave image foreign matter detection method based on block mixture Gaussian low-rank matrix decomposition
ActiveCN110426745AImprove object detection accuracyEasy to detectGeological detection using milimetre wavesPattern recognitionForeign matter
The invention discloses a method for detecting a hidden object in a millimeter-wave human body image based on block mixture Gaussian low-rank matrix decomposition.The method mainly solves the problemsof low imaging quality caused by weak scatter echo of the hidden object and low detection accuracy of a gray scale value of the hidden object and a human body similarity in the prior art. An implementing scheme of the method comprises the following steps of 1, removingabnormal points in an imaging region background in an original millimeter-wave human body image, and dividing the human body imageinto six parts according to proportions of human body parts; 2, decomposing all regions of thehuman body based on a block mixture Gaussian low-rank matrix decomposition algorithm to obtain a low-rankpart and a sparse part; and 3, binaryzing the sparse part by using a typology method, and removing small noise points to obtain a final detection result graph. The method increases the detection rateof various complicated small targets in the millimeter-wave human body image without a large number of training samples, so that the detected hidden object is more complete; and the method can be used for detecting hidden objects carried by people in public places such as an airport and a bus station.
Owner:XIDIAN UNIV +1
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