63results about How to "Translation invariant" patented technology

The invention relates to a tooth X-ray image matching method based on SURF point matching and RANSAC model estimation. The tooth X-ray image matching method includes the steps that (1), images are collected; (2), the images are enhanced; (3), features are extracted; (4), the features are matched; (5), related matching coefficients are calculated; (6), a matching result is displayed; (7), if reference images which do not participate in matching exist in an image library, the step (1) is carried out, a new reference image is selected from the image library, and if all images participate in matching, operation is finished; (8), matching succeeds, personal information corresponding to the reference images is recorded, and then operation is finished. The feature points of an input tooth image and a reference tooth image are extracted according to an SUFR algorithm, then the feature points are matched according to an RANSAC algorithm, and finally, the matching degree of the two images is measured according to the correlation coefficient of the two matched images. Experiment shows that by the tooth X-ray image matching method, the high precision ratio and high real-time performance are achieved.

Disclosed is a swatch sparsity image inpainting method with directional factors combined. The swatch sparsity image inpainting method mainly comprises the steps of conducing preprocessing on an image to be inpainted by the utilization of an existing image inpainting algorithm, extracting directional factors in four directions from the preprocessed image through non-subsampled contourlet transform, determining a new structural sparseness function and a new matching criterion according to the color-directional factor weighting distance, determining a filling-in order by means of the structure sparseness function and searching for a plurality of matching blocks according to the new matching criterion, establishing a constraint equation with color space local sequential consistency and directional factor local sequential consistency, optimizing and solving the constraint equation to obtain sparse representation information of the matching blocks, conducting filling, and updating filled-in regions until damaged areas are completely filled in. By means of the swatch sparsity image inpainting method, the consistency of the structure part, the clearness of the texture part and the sequential consistency of neighborhood information can be effectively kept, and the swatch sparsity image inpainting method is particularly applicable to inpainting of real pictures or composite images with complex textures and complex structural characteristics.

The invention provides a face beauty evaluation method based on deep learning. The method comprises the following steps: (1), acquiring a trainer face image set and a tester face image set; (2) learning face beauty characteristics of the trainer face image set by virtue of characteristic learning, and convoluting original images by use of a convolution template so as to form multiple characteristic images; (3) by taking the obtained characteristic images as input, learning a second-layer convolution template by use of a same characteristic learning method, and convoluting the characteristic images obtained in the step (2) by use of the convolution template so as to form multiple characteristic images; (4) performing binarization encoding on the obtained characteristic images, calculating and counting histograms in a local region, and then splicing all the counted histograms of the local region into a face image characteristic.; and (5), quantifying face beauty evaluation into multiple equivalence forms, and classifying by use of an SVM (Support Vector Machine) classifier so as to obtain an evaluation result. According to the method, the face beauty characteristics are automatically learned from a sample by virtue of a deep learning algorithm, so that a computer can intelligently evaluate the face beauty.

The invention provides an image fusion method and a device based on NSST and adaptive dual-channel PCNN. NSST is used as a multi-scale transform tool to decompose the image, NSST removes the sample operation in the decomposition phase, and has translation invariance, at the same time, a localize small size shearing filter can avoid spectral aliasing, so that the effect of image decomposition and reconstruction is better, using an adaptive simplified two-channel PCNN model with three kinds of link strengths, through three different link strengths, the features of the image are integrated, the infrared and visible images are fused effectively, the contrast is high, the texture information and detail information are well preserved, and the image transition is natural, no artifact phenomenon occurs.

The invention discloses a remote sensing image blue-topped house detection method based on a large-scale deep convolutional neural network. The method comprises the steps of obtaining a training dataset and performing labeling; constructing a network model comprising a feature extraction network, a context enhancement module, a target region generation network, a spatial attention module, a pooling layer and a target detection module; inputting the labeled training data set to train a network model; and inputting a to-be-detected remote sensing image into the trained network model to obtain adetection result of the blue-top house. The invention has the advantages that depth feature extraction, target candidate region generation, anchor box generation, context enhancement, a spatial attention mechanism and a target detection process are integrated into an end-to-end deep network model, and a good detection effect can be achieved for multi-scale remote sensing image blue-topped house detection.

The invention provides an image fusion method and device based on potential low rank representation and NSST. A source image is discomposed into multi-scale and multi-direction by an NSST including asmall-size shearing wave filter. Because NSST eliminates the sampling operation in the decomposition phase, it has translation invariance. At the same time, in the phase of directional localization,localized small-scale shearing filter can avoid spectrum aliasing phenomenon, and make the image decomposition and reconstruction effect better. For the low frequency component, LatLRR can extract thesalient features from the data robustly, and is more robust to noise, so it can identify the salient objects and regions in the image precisely. For the high frequency component, because the averagegradient represents the change of image gray value, it can reflect the details of image edge and texture, so the average gradient operator can better express the image features and achieve better fusion effect.

The invention, which belongs to the image processing field, puts forward an image segmentation method based on non-down-sampling shearlet conversion and a vector C-V model. According to the method, multi-level decomposition is carried out on a given image by using non-down-sampling shear waves to obtain low-frequency and high-frequency components at different directions; the components are sent to a vector C-V model; a series of evolving curves distributed uniformly are initialized on the overall image; and an obtained energy functional is minimized to obtain a segmentation result. With the method, the segmentation effect is obvious; and objective evaluation quality and the visual effect are good.

The invention discloses a polarimetric SAR classification method on the basis of NSCT and discriminative dictionary learning and mainly solves the problems of low classification accuracy and low classification speed of an existing polarimetric SAR image classification method. The polarimetric SAR classification method comprises the following implementing steps: 1, acquiring a coherence matrix of a polarimetric SAR image to be classified and carrying out Lee filtering on the coherence matrix to obtain the de-noised coherence matrix; 2, carrying out Cloude decomposition on the de-noised coherence matrix and using three non-negative feature values of decomposition values and a scattering angle as classification features; 3, carrying out three-layer NSCT on the classification features and using a transformed low-frequency coefficient as a transform domain classification feature; 4, using the transform domain classification feature and combining a discriminative dictionary learning model to train a dictionary and a classifier; 5, using the dictionary and the classifier, which are obtained by training, to classify a test sample so as to obtain a classification result. The polarimetric SAR classification method improves classification accuracy and increases a classification speed and is suitable for image processing.

The invention relates to a visual sense based static gesture identification method. The method comprises a training stage and a testing stage. In the training stage, a training image is preprocessed, an LBP feature and a CSS angular point feature are extracted from the training image, the extracted features are fused, and a classifier designed on the basis of compressive sensing theories is trained. In the testing stage, a shot gesture image is preprocessed, an LBP feature and a CSS angular point feature are extracted from the test image, the two features are fused, and the trained classifier is used for classified identification. According to the invention, two features are fused, the classifier is designed via the compressive sensing theories, disadvantages of single feature can be overcome, and the gesture identification rate is improved.

The invention relates to an urban management case image recognition method based on dictionary learning. The method comprises the following steps: firstly uploading urban management case images and various types of cases of a monitoring video screenshots to a cloud library, compressing the collected various types of cases through a compression technology, reducing the redundant information, and then transmitting and storing the compressed cases; extracting contour features of case sample images, and using training sample features to construct a dictionary model; adding a sample label into thedictionary, and classifying the urban management cases by the dictionary through an added linear discriminant; and finally, after the urban management cases are classified, reporting and auditing thecase types, and sending the case types to workers in the region in time. The working efficiency is improved, and intelligent urban case management is realized.

A Gauss noise variance estimation method based on NSCT and PCA belongs to the technical field of variance estimation. According to the method, a raw image with Gauss noise is firstly subjected to NSCT decomposition, and a low-pass filtering image and a plurality of high-pass filtering images in different directions are obtained; a new image Y is obtained by subtracting the low-pass filtering image from the raw image, and the image Y contains the Gauss noise and high-frequency information of the raw image; then an edge detection algorithm is used for edge detection of the image Y, and detected edge positions are marked; edge position images are removed, and the noise variances of non-edge position images are estimated by means of a PCA method. The method is widely applicable, more precise, and more robust.

The invention belongs to the technical field of image recognition, and discloses a laser marking system and method based on feature point extraction algorithm detection. The method includes extractingan unclosed contour from the to-be-identified workpiece image; obtaining coordinates of all contour points on the contour; calculating an area parameter of each contour; screening the optimal contourout through the area, calculating the moment and the centroid of the contour, finally, extracting the needed significant feature points through the relation between the contour points and the centroid, so that the shape of the workpiece to be identified is effectively extracted and expressed, and the relation between the feature points and the centroid is calculated to determine the effective marking area, and the final marking precision is improved. Moreover, the latitude of the used characteristic parameters is low, and the invention can guarantee the higher recognition accuracy and efficiency at the same time. The invention has excellent performances such as translation invariance and rotation invariance while effectively extracting and representing the shape characteristics of the workpiece, and can effectively inhibit noise interference.

The invention relates to a synthetic aperture radar (SAR) image de-noising method based on shear wave domain parameter estimation. In coherent speckle filtering processing for SAR images, the statistics features of speckle noises are described by using Rayleigh distribution. Since the mathematic expression of a Laplace distribution model is simple, the estimated parsing solution can be obtained in combination with Bayes theory. For shear wave coefficients representing backward scattering components, Laplace distribution is used to present the probability density function of the shear wave coefficients. The experiment shows that the de-noising method based on shear wave parameter estimation has obvious suppression effect on coherent speckle noise in SAR images, and better retains edge texture information in the images.

The invention discloses a remote sensing image scene classification method based on image transformation and a BoF model, and the method comprises the steps of carrying out the partitioning processing of a remote sensing image, obtaining an image block set, carrying out the improved Radon transformation of all image block sets, carrying out the local feature extraction through combining the scale invariant feature transformation SIFT of the image block set, and obtaining a local fusion feature of the improved Radon transform feature and the SIFT feature; secondly, carrying out edge detection on the whole remote sensing image, and improving Radon transformation to obtain global features of the remote sensing image; then, using an improved m-RMR correlation analysis algorithm based on mutual information for carrying out feature optimization on the local fusion features and the global features, removing unfavorable and redundant features, clustering all the features to generate feature words, and using an improved PCA algorithm for carrying out weighted fusion on the feature words to obtain a fusion feature; obtaining a fusion feature word bag model of the local features and the global features; and finally, inputting a support vector machine (SVM) to generate a classifier and realizing remote sensing image scene classification.

The invention discloses a 3D target identification method based on a sphere space, comprising the following steps: acquiring a depth image through a depth sensor, and getting 3D information of a target; preprocessing the depth image, and removing part of noise in the depth image; calculating the 3D coordinate parameters of points in a target image; constructing a sphere space, constructing a log-polar histogram according to the point cloud coordinates of the target, and forming a 3D feature descriptor; and calculating the matching degree, and getting the matching degree values between different images. Features of image shape and depth information can be extracted and represented. The method has scale invariance, rotation invariance and translation invariance. The accuracy of identification is improved.

The invention provides a micro-gesture recognition method, taking a data glove as input equipment, wherein the data glove can obtain rotation angle data of m joints. The micro-gesture recognition method comprises the following steps: a, firstly, carrying out data preprocessing, and carrying out curve fitting processing on the obtained data by using a least square method; b, carrying out gesture modeling, so that each gesture is represented by a discrete sub-sequence SLZ containing m elements; and c, carrying out gesture recognition, and carrying out gesture matching and recognition by using anediting distance based on template matching. According to the micro-gesture recognition method, the identification direction of the fine actions of the steering fingers is identified from traditionallarge-amplitude actions such as palms and arms, and a more natural and harmonious solution is provided for human-computer interaction in a universal environment.

The invention discloses a full-strapdown image seeker target tracking method based on a direct aiming template, which corrects a target image by using the direct aiming template and inertial navigation information to enable the target image to be consistent with a view angle and a scale between target images acquired by a full-strapdown image seeker, and has the characteristic of high tracking precision. The target tracking range can be reduced by fusing inertial navigation information and image information target memory tracking methods, and the problems of translation invariance, scale invariance and rotation invariance are solved; interference of similar targets is filtered, and target tracking is processed under the conditions of non-linear maneuvering short-time field of view, shielding and the like of the targets; a hill-climbing search strategy is adopted and improved mutual information entropy is used as a similarity measurement function, so that the method has the advantages of small calculated amount and strong anti-interference capability, and the target tracking robustness can be improved.

The invention discloses an autonomous star recognition method based on a combination mode. The feature of a combined main star in the combined mode of a radial mode and an encoding mode is adopted as the feature vector of the main star. In the recognition process, the search range of the main star in a navigation star feature library is reduced through an encoded value corresponding to the main star, the feature vector of the main star is matched and compared with vectors in the navigation star feature library, and autonomous recognition of the star is completed. The combination mode of the main star has horizontal movement and rotation invariance, and the high recognition rate is achieved, so that the method is more suitable for autonomous recognition of the star. Meanwhile, high star recognition speed is achieved, and the sensitivity of a system can be improved.

A protein and nucleic acid binding site prediction method based on graph neural network characterization comprises the following steps: constructing a protein and nucleic acid interaction data set, extracting the position and feature information of each residue in the protein and the structural context thereof after sample fusion processing, and constructing graph representation of the structural context of the residues according to the graph representation. And predicting the graph representation of the to-be-predicted protein through the hierarchical graph neural network to obtain the probability that each residue is combined with DNA/RNA, thereby realizing prediction of the binding site of the protein and the nucleic acid. Key structures and feature patterns of binding sites are learned from graph representations through graph representations based on residues of structural context and a hierarchical graph neural network model.