84 results about "Geometric representation" patented technology

A method of resecting distal and anterior portions of a distal portion of a femur for a bicompartmental prosthesis is provided. The method includes generating a geometric representation of the distal portion of the femur. A virtual anterior resection plane is calculated at a predetermined depth and is oriented at a predetermined angle relative to the femur. The method identifies a distal-most point of a lateral portion of the virtual anterior resection plane and an AP line. A varus/valgus angle and an anterior-posterior distance are calculated. Anterior and distal resection guides are navigated according to the parameters calculated from the method.

According to some aspects, a method of identifying a boundary of a portion of a vasculature is provided, the vasculature comprising a geometric representation of a plurality of vessels. The method comprises logically dividing the geometric representation into a plurality of regions, determining at least one feature within each of the plurality of regions, and defining the boundary of the portion of the vasculature based, at least in part, on the at least one feature determined within each of the plurality of regions, wherein the boundary forms a volume defining a separation between inside and outside of the portion of the vasculature. According to some aspects, a method of performing vascular analysis using a geometric representation of a plurality of vessels of the vasculature is provided. The method comprises computing a boundary of a portion of the vasculature based on the geometric representation, logically dividing the geometric representation within the boundary into a plurality of regions, and analyzing at least one feature for each of the plurality of regions within the boundary.

An information need can be modeled by a binary classifier such as support vector machine (SVM). SVMs can exhibit very conservative precision oriented behavior when modeling information needs. This conservative behavior can be overcome by adjusting the position of the hyperplane, the geometric representation of a SVM. The present invention describes a couple of automatic techniques for adjusting the position of an SVM model based upon a beta-gamma thresholding procedure, cross fold validation and retrofitting. This adjustment technique can also be applied to other types of learning strategies.

Direct slicing of CAD models to generate process planning instructions for solid freeform fabrication may overcome inherent disadvantages of using STL format in terms of the process accuracy, ease of file management, and incorporation of multiple materials. This paper will present the results of our development of a direct slicing algorithm for layered freeform fabrication. The direct slicing algorithm was based on a neutral, international standard (ISO 10303) STEP-formatted NURBS geometric representation and is intended to be independent of any commercial CAD software. The following aspects of the development effort will be presented: 1) Determination of optimal build direction based upon STEP-based NURBS models; 2) Adaptive subdivision of NURBS data for geometric refinement; and 3) Ray-casting slice generation into sets of raster patterns. Feasibility studies applying the direct slicing algorithm to example models and the generation of fabrication planning instructions involving multi-material structures will also be presented.

A method for designing an engine case static structure of a gas turbine engine includes creating signals representing an engine case static structure knowledge base of information. The knowledge base has a plurality of design rule signals with respect to a corresponding plurality of parameter signals of associated elements of an engine case static structure, wherein the knowledge base comprises at least one data value signal for each of the plurality of design rule signals. A desired data value signal is entered for a selected one of the plurality of parameter signals of an associated element of the engine case static structure and compared to the corresponding data value signal in the knowledge base for the corresponding one of the plurality of design rule signals. Signals representative of a geometric representation of the selected parameter signal may be created.

A system, method, and computer program for modifying a solid model representation that is manipulated in a computer having software instructions for design, comprising: a computer system, wherein the computer system includes a memory, a processor, a user input device, and a display device; a computer generated geometric model stored in the memory in the memory of the computer system; and wherein the computer system receives user input and accesses at least one data file having a plurality of geometric model definitions that define a geometric model; converts the geometric model definitions into a geometric representation of the geometric model; calculates a plurality of geometric conditions between at least one geometry identified by a user and the geometric model to create a set of constraints; and calculates a modified geometric model with a modified geometry according the set of constraints to display to the user; and appropriate means and computer-readable instructions.

A method and system for designing an impingement film floatwall panel system for a combustion chamber for a gas turbine engine comprising the steps of creating an impingement film floatwall panel knowledge base of information. The knowledge base has a plurality of design rule signals with respect to a corresponding plurality of parameter signals of associated elements of impingement film floatwall panels for a combustion chamber, wherein the knowledge base comprises at least one data value signal for each one of the plurality of design rule signals. The steps also include entering a desired data value signal for a selected one of the plurality of parameter signals of an associated element of the impingement film floatwall panels and comparing the entered desired data value signal for the selected one of the plurality of parameters with the corresponding at least one data value signal in the knowledge base for the corresponding one of the plurality of design rule signals. If the result of the step of comparing is such that the entered desired data value signal for the selected one of the plurality of parameter signals is determined to have a first predetermined relationship with respect to the corresponding at least one data value signal in the knowledge base for the selected one of the plurality of design rule signals, create signals representative of a geometric representation of the selected one of the plurality of parameter signals of the associated element of the impingement film floatwall panels.

A method of constructing an enveloping mesh geometry (EMG) for a plurality of sample mesh geometries (MG). The enveloping mesh geometry is a geometric representation of the mean of the probability distribution underlying the sample space from which the enveloping mesh geometry (MG) have been drawn. The method is based on estimating probability densities f_j using the kernel density method. The method further comprises constructing, based on the enveloping mesh geometry (EMG) so constructed, further enveloping mesh geometries (EMG-α) related to the α-Quantiles of the probability distribution. The enveloping mesh geometries (EMG, MG-α) are suitable for development and test procedures in aircraft and automotive manufacturing processes.

A system and method for visualizing data. Data are provided either in the form of data values of a data array or in the form of a geometric representation. A data array may be, for example, a sparse matrix. A geometric representation, may be, for example, an integrated circuit layout coded in a geometric description language. Data provided in the form of data values are associated with geometric shapes placed on a grid. Information placed on the grid is then reported to a user. If data are provided in the form of a geometric representation, then data values are extracted from the geometric representation. A graphic representation is generated from the extracted data values. The graphic representation is exhibited to a user.

The present invention discloses a method for building, defining, and storing features in an application neutral format comprising building a feature based on a feature class, wherein the feature class comprises feature geometry, feature constraints, and feature dimensions, defining the built feature as a geometric representation of an individual feature type, and storing the representation in a binary file format.

A method and apparatus for object-based visibility culling includes receiving a plurality of draw packets, such as pixels or vertices. The method and apparatus further includes comparing each of the plurality of draw packets to a bounding volume object, wherein the bounding volume object may be a low resolution geometric representation of a specific object. Whereupon, for each of the plurality of draw packets, if the draw packet is deemed potentially visible, setting a visibility query identifier and rendering the draw packets having the set visibility query identifier.

A method for creating composite images of multiple objects using standard commodity graphics cards is provided that eliminates the need for expensive specialty graphics hardware for generating real-time renderings of the composite images. After the desired composite image and the objects contained in the composite image are identified, a volume rendered image of a first object is obtained. In addition, at least a first geometric representation and a second geometric representation of a second object based upon a desired composite image of the first and second objects are generated. These geometric representations are preferably polygonal representations. The volume rendered image and the geometric representations are used to create a plurality of composite image components. Each composite image component contains at least one of the volume rendered image, the first geometric representation and the second geometric representation. The composite image components are blended to create the desired composite image.

An applicator comprises a first structural element which has a shape determined according to a digital geometric representation of a target structure, the applicator further comprises an active agent located according to a diagnostic scan of the target structure.

A method for forming an applicator comprises steps of: creating a digital geometric representation of the structure, the target structure having a flatness ratio; forming the applicator using the digital geometric representation of the target structure, the applicator having a target structure contacting surface; and disposing an active agent upon the target structure contacting surface of the applicator.

A data structure includes a plurality of voxel element arrays of memory locations, the arrays being arranged and associated with a set of indices whereby indices of the set identify corresponding memory locations in each array. The data structure further includes a base array for storing an identification of a contiguous group of the memory locations in each array in which voxel elements of a corresponding group of active voxels may be stored. A method of employing the data structure includes associating a column of active voxels in a voxel block, with a group of memory locations in each array, each memoray location being associated with a respective index. Geometric representations and attributes of active voxels in the column are stored in respective memory locations of said group.

In one exemplary embodiment, a computer-implemented method includes obtaining a data set from a data source. The data set is prepared for an analysis operation according to a problem type. A result is generated from an interactive geometric node based a geometric property of the data set. A specified condition is determined with the result from the interactive geometric node based on a query to the interactive geometric node. A system's geometric configuration is determined. A geometric control criterion is determined.

A method for the substantially complete detection and measurement of all particles, within a predetermined size, range, contained in an injectable solution comprising the steps of: a) rotation of the container causes substantially all of the particles in the injectable solution in the container to be set in motion; b) uniformly illuminating the background around the container with light; and c) detecting at least one of light scatter, light reflection and light extinction caused by said particles, with detectors having a depth of focus of detection in a specified volume of the container. Wherein the detectors are positioned, relative to the container whereby the optical path and field of view allows the sensor sufficient focus to view substantially all of the bottom interior surface of the container and substantially all of the solution volume within the container. The method and apparatus produces a geometric representation of the particles in the detection region, whereby the size of detected particles can be is accurately adjusted to an actual size by either calculation or by calculated offset to allow accurate measurement of particle dimensions.

A method of channel encoding and channel decoding in a multiple access communication system wherein the channel decoding requirements increase linearly and not exponentially as the number of users increase. A channel encoder converts alphabetic symbols into a preselected geometric representation of a hexagonal lattice known as a symbol constellation. A channel decoder converts the received symbol constellation into a replication of the alphabetic symbols. Each user has a specially defined symbol set that allows the linear-complexity decoding operation.

A method and an apparatus are provided for building a subject-specific statistical model of shape variation for an anatomical structure using a set of geometric representations of shape for the anatomical structure. Each representation is associated with one of multiple subjects, each subject having a respective subset of associated representations, and each subset comprising multiple representations including a reference representation. The multiple representations correspond to different shapes of the anatomical structure arising from physical motion and/or deformation thereof. The method comprises specifying a set of shape parameters whose values, for any given representation, characterise the shape of the representation, and for each subject, representing a probability distribution of the values of the shape parameters across the subset of representations associated with that subject by a set of subject-specific distribution parameters. The method further comprises determining a regression between the subject-specific distribution parameters and the respective reference representation for each subject, and applying said determined regression to a reference representation for a new subject to determine subject-specific distribution parameters for the new subject. The subject-specific distribution parameters are then used to build a subject-specific statistical motion model for the new subject.