55 results about "Orientation field" patented technology

A method, apparatus, and article of manufacture provide the ability to control a three-dimensional scene view. A three-dimensional (3D) scene having one or more three-dimensional objects is displayed. A 3D representation of a coordinate system of the scene is displayed. The 3D representation contains a current viewpoint, one or more faces, one or more edges, and one or more corners with each face, edge, and corner representing a corresponding viewpoint of the scene. The 3D representation is manipulated. A new current viewpoint of the 3D representation is displayed based on the manipulation. The scene is then reoriented corresponding to the new current viewpoint based on the manipulation of the 3D representation.

The invention relates to a device and a method for controlling the steering of a vehicle during a parking maneuver. To this end first the parking spot selected for parking the vehicle is surveyed. Based on said survey, an orientation field is prepared, which defines a target orientation for a plurality of positioning points inside the selected parking spot and in the surroundings of the parking spot, the vehicle being guided along these points from any arbitrary point inside the orientation field to the target point of the parking maneuver. The control of the vehicle occurs by comparing the respective current orientation thereof to the target orientation specified for the respective position in the orientation field and by an appropriate adjustment of the steering angle by the vehicle orientation to said target orientation.

The invention relates to a device (20) and a method for controlling the steering of a vehicle (2) during a parking maneuver. To this end first the parking spot (15) selected for parking the vehicle (2) is surveyed. Based on said survey, an orientation field is prepared, which defines a target orientation for a plurality of positioning points inside the selected parking spot (15) and in the surroundings of the parking spot, the vehicle being guided along these points from any arbitrary point inside the orientation field to the target point of the parking maneuver. The control of the vehicle (2) occurs by comparing the respective current orientation thereof to the target orientation specified for the respective position in the orientation field and by an appropriate adjustment of the steering angle by the vehicle orientation to said target orientation.

A hybrid orientation semiconductor structure and method of forming the same. The structure includes (a) a semiconductor substrate comprising a first semiconductor material having a first lattice orientation; (b) a back gate region on the semiconductor substrate; (c) a back gate dielectric layer on the back gate region; (d) a semiconductor region on the back gate dielectric layer, wherein the semiconductor region is electrically insulated from the back gate region by the back gate dielectric layer, and wherein the semiconductor region comprises a second semiconductor material having a second lattice orientation different from the first lattice orientation; and (e) a field effect transistor (FET) formed on the semiconductor region, wherein changing a voltage potential applied to the back gate region causes a change in a threshold voltage of the FET.

The invention is applicable to the technical field of biological identification, and provides a fingerprint identification method and a fingerprint identification device. The method comprises the following steps: minutiae of an input fingerprint pattern are extracted by a statistical method; and fingerprint matching is carried out according to the extracted minutiae to obtain a fingerprint identification result. According to the method provided by the embodiment of the invention, the directions of the minutiae are calculated based on statistical information, a statistically significant descriptor is added for the minutiae, and the steps of minutiae similarity calculation with the use of the descriptor and region matching with the use of orientation field and gradient field information of an overlap region are added in the matching process. Therefore, instability and poor specificity of fingerprint feature expression in a traditional algorithm are avoided, and the accuracy of fingerprint identification is improved.

This invention discloses a fingerprint synthesis method and system based on new direction module and improved Gabor filter, including steps: generate fingerprint template image, create fingerprint profile image for the first step, and on the second step generate fingerprint orientation field through new joint direction field module, the third step is to generate density map with a new presentation method of fingerprint density map, on the fourth step create fingerprint ridge texture through improved Gabor filter; fingerprint generated according to pressing image, a series of transformation has been generated on the fingerprint template images, including adding scratches, texture translation, the expansion or corrosion of the ridge, the elastic deformation of ridge line, noise and smooth of ridge line, translation and rotation of image, change contrast, add background noise. The system includes: fingerprint template image module and fingerprint image compression unit. The present invention can generate realistic image of the fingerprint. It plays an important value in biological identification technology.

A method for detecting architectural distortion within mammographic image data. The method identifies breast tissue within the image data, generates an orientation field and a corresponding magnitude field within the identified breast tissue and generates a feature map by processing the orientation field with a phase portrait model at one or more image scales. The method identifies one or more architectural distortion features according to the generated feature map and displays the one or more identified architectural distortion features.

Provided is a system and method for displaying the effects of light illumination on a surface. One or more light sources are illuminating a surface. The surface is divided into one or more cells. The orientation of each cell is determined and saved in an orientation field. A multidimensional light map value is derived and associated with the surface. The multidimensional light map value defines the combined illumination of the one or more light sources on the surface, and may optionally be a vector. At least one cell to be drawn is determined. For each cell to be drawn, an illumination value associated with that cell to be drawn is determined. The illumination value is based on the orientation field and the multidimensional light map value. The illumination value may be the dot product of the orientation field and the multidimensional light map value.

The present invention relates to a method of identifying a target object in an image using image processing. It further relates to apparatus and computer software implementing the method. The method includes storing template data representing a template orientation field indicative of an orientation of each of a plurality of features of a template object; receiving image data representing the image; processing the image data to generate an image orientation field indicating an orientation corresponding to the plurality of image features; processing the image orientation field using the template orientation field to generate a match metric indicative of an extent of matching between at least part of the template orientation field and at least part of the image orientation field; and using the match metric to determine whether or not the target object has been identified in the image. Image and / or template confidence data is used to generate the match metric.

The present invention provides a method, apparatus, storage medium and device for controlled synthesis of inhomogeneous textures, which relates to the field of texture synthesis technique in image processing. The method includes: obtaining an input texture exemplar from user, and analyzing the features of the exemplar, so as to extract the source guidance channels; herein the guidance channels comprise a progression map and an orientation field of the texture exemplar; obtaining a progression map and an orientation field from the user specified target, which are used as the target guidance channels; comparing the differences between the source guidance channels and the target guidance channels, so as to form the progression constraint and orientation constraint; determining the distance measure between the texture exemplar and target image, and adding the progression constraint and orientation constraint into the distance measure; the target image produced by minimizing the sum of distances over all patches with the constrained distance measure, is the final output of controlled synthesis.

A “texture generator” uses an inverse texture synthesis solution that runs in the opposite direction to traditional forward synthesis techniques to construct 2D texture compactions for use by a graphics processing unit (GPU) of a computer system. These small 2D texture compactions generally summarize an original globally variant texture or image, and are used to reconstruct the original texture or image, or to re-synthesize new textures or images under user-supplied constraints. In various embodiments, the texture generator uses the texture compaction to provide real-time synthesis of globally variant textures on a GPU, where texture memory is generally too small for large textures. Further, the texture generator provides an optimization framework for inverse texture synthesis which ensures that each input region is properly encoded in the output compaction. In addition, the texture generator also computes orientation fields for anisotropic textures containing both low- and high-frequency regions.

The invention discloses a permanent-magnet material resistant to high temperature and with high magnetic performance. The mass of the permanent-magnet material comprises 100 parts of Nd2Fe14B magnetic powder, 0.1-0.3 part of ferrocene magnetic powder, 0.1-5 parts of titanate coupling agent, 1-10 parts of bisphenol A epoxy resin and 0.2-3 parts of graphene oxide powder, and a cured material is formed after uniformly mixing the raw materials in a composite environment of a temperature field with a constant temperature being 20-200 DEG C and an orientation field with field magnetic intensity being 0.5-3T. With the permanent-magnet material provided by the invention, the defect of unfavorable temperature resistance of a bonded NdFeB material is improved, the application range of the bonded NdFeB material is expanded, the defect of low application temperature of the bonded NdFeB material can be made up, the magnetic performance of the magnet under high temperature is greatly improved, the weight loss of the magnet can be effectively reduced, and the corrosion resistance of the magnet is improved.

The present invention relates to a method of generating a keypoint descriptor for identifying an object in an image or in a sequence of images, the keypoint descriptor being substantially invariant to a transformation of the object in the image. The method includes receiving object data representing an object for identification in an image; processing said object data to generate at least one basis function representing a feature having undergone at least one transformation or a transformation sequence across several consecutive frames, optionally using transformations that are out of the image plane to recognise objects from multiple views; modifying a prototype wavelet function based on said at least one basis function to generate a plurality of modified wavelet functions; comparing the plurality of modified wavelet functions with the at least one basis function; selecting a modified wavelet function of said plurality of modified wavelet functions based on the comparison of the plurality of modified wavelet functions with the at least one basis function; and processing an input image or input orientation field according to said selected modified wavelet function to generate the keypoint descriptor. The present invention further relates to a method of identifying an object in an image using a keypoint descriptor; and apparatus and computer software for implementing a method in accordance with the present invention.

A system method and computer-readable medium for correcting measurements obtained by a down hole tool for residual measurement errors is disclosed. A down hole tool having at least two directional field sensors is disposed in a borehole. The at least two directional sensors are substantially orthogonal to each other and to a longitudinal axis of the down hole tool. Measurements are obtained from the at least two directional sensors during rotation of the tool by at least 360 degrees around the longitudinal axis of the tool. Residual measurement errors are determined for the obtained measurements, and a quality level of the determined residual measurement errors selected. The determined residual measurement errors are applied to the obtained measurements when the determined residual measurement errors are consistent with the selected quality level. In various embodiments, the residual measurement errors are reduced from a first value that does not match the selected quality level to a second value that are consistent with the selected quality level.

The invention relates to a method for separating superimposed fingerprint images, which comprises the following steps: carrying out processing on a superimposed fingerprint image according to a fingerprint profile so as to obtain a background region image, a fingerprint superimposed region image and a single fingerprint region image; carrying out operation on the single fingerprint region image by using a gradient algorithm so as to obtain a first kind of fingerprint initial orientation field data, and carrying out operation on the fingerprint superimposed region image by using a local Fourier analysis algorithm so as to obtain a second type of fingerprint initial orientation field data, carrying out processing on the fingerprint initial orientation field data by using a loose labeling algorithm so as to obtain two types of rough fingerprint orientation field image files, and determining the optimal combination of fingerprint singular-points through a minimized original orientation field and a model-based orientation field reconstructed by the fingerprint singular-points; carrying out fingerprint orientation field reconstruction according to a hybrid model so as to obtain model-based fingerprint fine orientation field data; and carrying out processing on the model-based fingerprint fine orientation field data by using a filtering enhancement algorithm so as to obtain two fingerprint image files subjected to separation.

The invention provides a panoramic around-looking system of a two-section articulated vehicle. The system comprises fisheye cameras, an angle sensor structure and a data acquisition processor, and thepanoramic around-looking system processes video images collected by three fisheye cameras which are installed on a vehicle head or a carriage respectively and have orientation field angles of at least 180 DEG and angle information collected by a hinge disc angle sensor through a data collection processor to obtain a panoramic around-looking image of a peripheral area of the hinge engineering vehicle, wherein for two articulated vehicles, the three fisheye cameras are arranged on the front vehicle head and the rear carriage. Through the design of an angle sensor mounting structure, the effectthat the angle sensor is not affected by vehicle bumping is achieved. The installation position design of the fisheye cameras and the design of a calibration method can generate a panoramic around-looking image covering the periphery of the articulated engineering vehicle.

A “texture generator” uses an inverse texture synthesis solution that runs in the opposite direction to traditional forward synthesis techniques to construct 2D texture compactions for use by a graphics processing unit (GPU) of a computer system. These small 2D texture compactions generally summarize an original globally variant texture or image, and are used to reconstruct the original texture or image, or to re-synthesize new textures or images under user-supplied constraints. In various embodiments, the texture generator uses the texture compaction to provide real-time synthesis of globally variant textures on a GPU, where texture memory is generally too small for large textures. Further, the texture generator provides an optimization framework for inverse texture synthesis which ensures that each input region is properly encoded in the output compaction. In addition, the texture generator also computes orientation fields for anisotropic textures containing both low- and high-frequency regions.

The invention discloses a preparation method for a permanent-magnet material with high temperature resistance and high magnetic performance. The preparation method comprises the steps of 1) uniformly stirring and mixing Nd2Fe14B magnetic powder and graphene oxide powder to prepare mixed magnetic powder, mixing and adding a titanate coupling agent and an organic solvent into the mixed magnetic powder, mixing the product with ferrocene magnetic powder, performing drying, and performing vacuum drying and granulation after the dried mixed magnetic power and bisphenol A epoxy resin are mixed; and 2) forming the mixed magnetic powder obtained in the step 1) for 10-30 minutes in a composite environment of a temperature field with a constant temperature being 20-200 DEG C and an orientation field with magnetic field intensity being 0.5-3T so as to prepare the permanent-magnet material with high temperature resistance and high magnetic performance, wherein the formation pressure range is (2-8)ton / cm<2>. According to the method, the magnetic performance of a magnet is greatly improved by the permanent-magnet material, the weight loss of the magnet can be effectively reduced, and the corrosion resistance of the magnet is improved.

The invention relates to heat-dissipation magnetic plastic and a preparation method thereof and belongs to the technical field of magnetic plastic. In order to solve the technical problems, the heat-dissipation magnetic plastic and the preparation method thereof are provided. Nano-ferrite magnetic particles coated with PEG (polyethylene glycol) are prepared with a coprecipitation method, so that aferrite magnetic liquid is obtained. Ferrite fine magnetic powder directly added in a conventional process is replaced with the ferrite magnetic liquid, a magnetic-field orientation field is added during mold filling of a melt, the melt is driven to flow by flowing of the magnetic liquid, so that processing flowing property is improved, the mold filling rate is increased, further, injection molding can be performed under the action of low-strength magnetic field, and energy consumption is reduced. A magnetic material provided with a heat conducting layer on the surface is obtained by sandwichinjection, the preparation method of the plastic is simple and fast, and the prepared magnetic material is good in heat dispersion performance.

The invention relates to the technical field of magnetic powder orientation of circular magnets, in particular to a method and device for radiating orienting a circular ring. Magnetic powder is loaded into a ring-shaped mold cavity, and the magnetic powder in the ring-shaped mold cavity is oriented by an orientation magnetic field device. Orientation The orientation magnetic field of the magnetic field device exists around the annular mold cavity, which generates annular strong magnetism, and presses the magnetic powder and obtains the blank by applying force through the upper die punch and the lower die punch; The magnetic powder in the mold cavity is oriented in a ring, which improves the degree of orientation. During the molding process, the orientation magnetic field reciprocates along the axial direction of the ring mold cavity. There is a ring strong magnet in the ring mold cavity, which moves along the ring mold cavity. Not only can the magnetic powder be uniformly oriented, but also a large orientation field can be obtained when making a radiation ring with a small inner diameter or a high height, so that the magnetic properties and consistency of the radiation ring are greatly improved.

The invention provides a permanent magnet, the magnetic densities of a left arc and a right arc are symmetrical, and the permanent magnet is tile-shaped, wherein the cross sections of the left arc and the right arc of the tile-shaped permanent magnet are circular arcs, and the magnetic densities on the same height position of the left arc and the right arc of the tile-shaped permanent magnet are same. During the formation of an orientation field, a blank mould of a magnetic tile is provided with such a position in a loop of the orientation field: the straight lines of the left arc and the right arc of the magnetic tile of the permanent magnet are vertical to a circular arc line of a magnetizing loop, and the position of the magnetizing loop is closest to the blank mould of the magnetic tile. The difference between the magnetic densities of the left arc and the right arc are less than 3 percent, and can easily reach less than 1 percent, thereby improving the efficiency of a motor, and avoiding the problems of noise and service life.

The invention discloses a deformed fingerprint matching method based on a curvilinear coordinate system and transference of reference minutiae. The method comprises the following steps: (1). a fingerprint image is represented that I(m*n),O(i, j) belonging to [0, pi) is the local ridge orientation at the pixel (i,j), and each minutia in the fingerprint image I is described by coordinate, direction and type; (2). X axis and Y axis of the curvilinear coordinate axes are extracted from each minutia by taking each minutia as an origin based on a ridge mode and an orientation field of the minutiae; (3). scales of the curvilinear coordinate axes are computed; (4). the coordinate relation between every two minutiae mi and mj are computed; and (5). The minutiae are matched by the method based on the transference of the reference minutiae: provided that a template fingerprint image T and an input fingerprint image Q contain p minutiae and q minutiae respectively, C(T) equals (Ci, j<T>), C(Q) equals (Ci, j<T>), wherein, i is not less than 0 and j is less than q; T and Q are matched by utilizing the minutiae of the C(T) and C(Q) pair to compute the matching minutiae. The method has the advantages of high identification accuracy rate, high efficiency and simple algorithm.

The invention discloses an anisotropic finite element modeling method based on harmonic field for patient-specific sclera, which comprises the following steps that high precision laser scanning is applied to attain a stereoscopic model of a patient-specific sclera; the stereoscopic model is designated with a sclera weight and provided with a umbrella operator to attain the harmonic field; the harmonic field is provided with constrained conditions, the gradient field and the contour field of the harmonic field are distributed; through the gradient field and the contour field, a regular hexahedral mesh is distributed smoothly on an irregular sclera; the stereoscopic model is provided with anisotropic material parameters based on the harmonic field; the experiment result is compared. The anisotropic finite element modeling method based on harmonic field for patient-specific sclera can provide effective modeling for patient-specific sclera. Anisotropic material orientation field are added, thereby high accuracy and quality of the modeling being guaranteed, and irregular hemisphere sclera being provided with individual parameters.

A method for registering a fingerprint image is provided. The method comprises steps of: establishing an orientation field template base according to M training fingerprints, wherein M is a positive integer larger than one; receiving a fingerprint image to be registered; obtaining an initial orientation field of the fingerprint image; obtaining an estimated position and an estimated direction of the fingerprint image according to the initial orientation field and the orientation field template base; and registering the fingerprint image according to a preset position, a preset direction, the estimated position and the estimated direction.

The invention discloses a weighted multi-scale composite window fingerprint orientation field building method and a hierarchical smoothing algorithm. The weighted multi-scale composite window fingerprint orientation field building method includes the following steps: first, building fingerprint orientation field OF information under a series of composite windows of different scales; then, determining the weight of each scale in the series according to square gradient consistency indexes; and finally, integrating the OF information under the whole series according to the weights to get a fingerprint orientation field OF. The fingerprint orientation field (OF) of a low-quality fingerprint image is reconstructed, and the orientation of a singular point area is better fitted. The orientation of a noise area can be estimated accurately, and position offset of a singular point is avoided. In addition, the fingerprint orientation field is processed using the hierarchical smoothing algorithm, which helps to repair a wrong ridge structure, and ensures that the position of a real singular point does not shift.

The invention discloses a method for extracting a fingerprint direction field under a Morkov random field based on priori knowledge. The problems of incapability of accurately extracting fingerprint direction field information in a low-quality area and high generation rate of pseudo-singular point information in a model method in the prior art are mainly solved. The method is implemented by the following steps of: (1) inputting a fingerprint image, extracting the priori knowledge of a direction field of the fingerprint image, obtaining a block angle matrix of the fingerprint image by using a gradient method, and obtaining the probabilities of block angles by using a statistical method; (2) fitting the priori knowledge of the direction field, the obtained block angle matrix and the probabilities of the block angles, and constructing a priori-knowledge-based Morkov random field model of the fingerprint image; and (3) extracting a final direction field of the fingerprint image by using the constructed model. The priori knowledge of the fingerprint direction field is fitted on the basis of the conventional Morkov random field, and a new fingerprint direction field extraction model is constructed, so that the matching and retrieval performance of the fingerprint image are improved, and the method can be used for extracting the direction field of a low-quality fingerprint image.

The invention is applicable to the technical field of graphics processing, and provides a fingerprint direction field extraction method combined with direction diffusion. The method calculates the direction of fingerprint blocks based on a point direction similarity weighted linear projection analysis. Based on the direction consistency estimation of fingerprint image blocks, the quality of fingerprint block is evaluated, a fingerprint image orientation field extraction method based on block quality grading mechanism and compound window strategy is designed, wherein high quality block directions are estimated first, then the low quality block direction is estimated, combined with the block neighborhood priority, the high quality block direction information which is preferentially estimatedis diffused into the low quality block to be estimated under the compound window strategy, so as to effectively improve the accuracy and reliability of the direction estimation of the low quality block.