132 results about "Geometric analysis" patented technology

We disclose quantitative geometrical analysis enabling the measurement of several features of images of tissues including perimeter, area, and other metrics. Automation of feature extraction creates a high throughput capability that enables analysis of serial sections for more accurate measurement of tissue dimensions. Measurement results are input into a relational database where they can be statistically analyzed and compared across studies. As part of the integrated process, results are also imprinted on the images themselves to facilitate auditing of the results. The analysis is fast, repeatable and accurate while allowing the pathologist to control the measurement process.

A technique is provided for geometrical analysis and calibration of a volumetric imaging system. The technique includes computing a projection error between estimated locations of a set of markers of a phantom based on a estimated imaging geometry and observed locations of the respective markers for at least one projection image, decomposing the computed projection error into one or more error components corresponding to respective geometric parameters of the imaging geometry, and updating at least one parameter of the estimated imaging geometry based on the one or more error components.

User interaction with a display is detected substantially simultaneously using at least two cameras whose intersecting FOVs define a three-dimensional hover zone within which user interactions can be imaged. Separately and collectively image data is analyzed to identify a relatively few user landmarks. A substantially unambiguous correspondence is established between the same landmark on each acquired image, and a three-dimensional reconstruction is made in a common coordinate system. Preferably cameras are modeled to have characteristics of pinhole cameras, enabling rectified epipolar geometric analysis to facilitate more rapid disambiguation among potential landmark points. Consequently processing overhead is substantially reduced, as are latency times. Landmark identification and position information is convertible into a command causing the display to respond appropriately to a user gesture. Advantageously size of the hover zone can far exceed size of the display, making the invention usable with smart phones as well as large size entertainment TVs.

The invention relates to a space borne TDICCD camera integral timing and adjusting method, which comprises the following steps: (1) the orbit is simulated with high precision in which positions parameters of photographed spots of the satellite under drift angle control or at different swinging angles are outputted such as vector coordinates and oblique distances of the photographed spots as well as vector simulation data for the satellite position; (2) the vector simulation data for the satellite position are analyzed to come out with the shift speeds of the photographed spots; (3) eliminate the radial-directional speeds from the shift speeds of the photographed spots to become the image motion speeds; (4) utilize the image motion speeds and the oblique distances of the photographed spots to obtain the integral times. The invention also provides a design method for TDICCD related parameters as well as a real-time adjusting method for integral times on the satellite under control of ground commands. The space borne TDICCD camera integral timing and adjusting method realizes an organic combination of simulation modeling with high precision and positional vector differential method, which eliminates errors introduced into the deduction process in traditional geometric analysis and calculation and controls error delivery to improve calculation precision; the arrival real-time adjusting method for integral times on the satellite ensures a reliable integral synchronous control.

A method of extracting features and classifying a neurological state of a subject is provided. The method includes recording brain electrical activity, organizing the recorded data set into digital documents, computing a diffusion geometry on the data set comprising at least a plurality of diffusion coordinates, and classifying the data set into a neurological state based on the metrics provided by the diffusion coordinates.

A method and system for detecting the presence of restriction to expired airflow in humans or animals by analyzing the expired capnogram and oxygram, as well as the geometric analysis of the real-time plot of the waveform that depicts the instantaneous ratio of CO₂ to O₂ (the carboxygram ratio). Airway obstructions causes an increase in the Q-angle between the slope of phase 11 and slope of phase III in the expired carboxygram. The diagnostic accuracy of the detection of airways obstruction is further enhanced by measuring the ratio of time spent in exhalation (Te) versus inhalation (Ti). The system uses the combination of an increased carboxygram Q-angle, and a prolonged Te/Ti to detect presence of airways obstruction.

A method for geometrically analyzing motion having the steps of: choosing a set of points having at least three individual points to define a single realization of a motion; sequentially collecting Cartesian coordinates of the set of points at different times during the motion from a start point to an end point; treating the collection of sets of points as a sample of the motion; and transforming the sets of points at the different times to a common coordinate system thereby defining a trajectory of the motion. In a preferred implementation of the method of the present invention, the method further has the steps of: choosing a set of points having at least three individual points to define a single realization of a motion; sequentially collecting Cartesian coordinates of the set of points at different times during the motion from a start point to an end point; treating the collection of sets of points as a sample of the motion; transforming the sets of points at the different times to a common coordinate system thereby defining a trajectory of the motion; and calculating elliptic Fourier coefficients describing the trajectory of the motion independent of any difference in the spacing of the different times.

The present invention relates to an apparatus for identifying surrounding environment by means of image processing, so as to be used by blind people or unmanned vehicles. The said apparatus comprises an input device, which includes at least one CCD or CMOS means for capturing images, a processing device, which could be a micro processing unit such as a notebook computer, DSP or other embedded system, and an output device, such as a speech earphone. The processing device applies hue analysis and geometric analysis to identify traffic signals and markings.

An algorithm for deducing all possible scenarios of satellite members and possibilities thereof in a low earth orbiting (LEO) satellite constellation is described, which is achieved mainly by relying on the spherical geometry analysis and probabilities and statistics technologies, in an attempt to rapidly and precisely obtain the concerned scenarios and possibilities thereof observed on the earth ground. With any user-defined orbital parameters and a position of an observation station for the scenarios on the earth ground inputted, all the possible scenarios and possibilities thereof can be obtained with the algorithm.

The invention belongs to the technical field of information processing and particularly relates to a multimodality image fusion method combining multi-scale bilateral filtering and direction filtering. The invention is used to fuse the images of different sensors of the same scene or the same target. The method comprises the following steps: firstly, the multi-scale bilateral filtering is utilized to decompose each source image and obtain a low-pass image and a series of high-pass images; secondly, direction filtering is performed to the high-pass images to the direction indications of the images, then the low-pass images and the directional sub-band images are separtely fused according to a certain fusion rule to obtain a fused low-pass image and a fused directional sub-band image; and finally, the fused image is obtained through direction filtering reconstruction and inverse multi-scale bilateral filtering. The method of the invention has better fusion effect and is better than the traditional multi-scale geometric analysis method; and the quality of the fused image is greatly increased.

A system to analyze the geometry of a radiation treatment apparatus, software, and methods are provided. The system includes an apparatus having a rotating assembly and a trackable body or plurality of trackable bodies, to mark a location of a preselected portion of the rotating assembly. The system also includes a trackable reference fixture and can include a constant orientation trackable body. A determiner determines the position and/or orientation of the trackable bodies, the trackable reference fixture, and constant orientation trackable body. The determiner then determines the geometry of the treatment apparatus to analyze a coordinate system used by an operator. The determiner can have a memory and geometry analyzing software stored in the memory to analyze the treatment apparatus geometry.

The invention discloses a surgical instrument calibration system and method for navigating surgery. The calibration system includes a navigator, a calibration table, a calibration table reference mark, a surgical instrument reference mark, a computer and a display. When calibrating, only the surgical instrument is held and fixed on the standard position on the calibration table, the structural parameters of the calibration table are used, all the reference mark images of the surgical instrument and the calibration table are collected simultaneously by the navigation instrument at one time, andthe axial vector and the tip position of the surgical instrument are directly calculated by the geometric analysis algorithm software, the template position of the surgical instrument is recorded, and the calibration of the surgical instrument is completed. All parameters can be calibrated by this system in one time, which can greatly reduce the number of times of image acquisition, simplify thecalibration process, improve the accuracy and reliability of calibration, save time and labor, and make the whole calibration process with high efficiency and small error. The calibration process is simple and easy to operate, which can obviously reduce the risk of calibration failure and improve the success rate of calibration. The calibration table is simple in structure, accurate and reliable,and easy to manufacture and use.

The invention relates to a method for identifying cancer cells, belonging to the field of a medical instrument. The method comprises the following steps of: collecting images, analyzing the images, and outputting detection results, wherein the image analysis comprises noise reduction treatment, color space exchange, color regulation, images cutting, characteristic extraction, geometric analysis, and image identification. The invention provides a system and method for identifying cancer cells disclosed by the invention have reasonable price and good detection effect, can automatically analyze pathological images so as to find tumor cells at the early stage.

Two methods are described for calculating the non-periodic display pixel pattern necessary for good viewing properties of a multiple view directional display with a fixed parallax barrier pitch. These methods could also be used to calculate optimum barrier pitch parameters for a display with a re-configurable parallax optic, such as a re-configurable parallax barrier, and a fixed pixel assignment, or to calculate hybrid system parameters in a display where the parallax optic (eg a parallax barrier) and the pixel assignment are both re-configurable. The first method uses a geometrical analysis to calculate a non-integer subpixel repeat unit for interlacing. In this approach interlacing starts at a point determined by the user's head position relative to the display. The non-integer number ensures that the interlace pattern inserts extra pixels where necessary in order to compensate for the user's head position. The second method uses a pixel-by-pixel calculation step, whereby every pixel's position relative to the user's eyes and the nearest slit of the barrier determines whether the pixel should show left-view or right-view information. This approach may be done for blocks of pixels, but performance is optimal when calculated on a pixel-by-pixel basis.

The invention discloses a method for designing a super oleophobic surface structure and relates to the technical field of design and preparation of functional surfaces of micronano structures. The method comprises the following steps of: calculating the radius of the curved surface of the liquid-vapor interface according to the pressure intensity born by the work of the super oleophobic surface and the pressure intensity difference among gases (the pressure intensity difference of the liquid-vapor interface); determining the longest period of the micro structure according to the radius of the curved surface; determining the protuberant ratio of the structure according to the super oleophobic requirement; and finally, carrying out textual research on the contact state of oil liquid and the surface of the structure according to the structural form of the super oleophobic surface and the designed structural parameters (period to the protuberant ratio) and ensuring that the oil liquid is in a Cassie contact state. By using the geometrical analysis method, the special microstructure form and parameters are analyzed so as to realize the super oleophobic performance of the surface and the direct controllable design of the super oleophobic surface.

The invention discloses a grid free-form surface toroidal cutter path planning method based on improved Butterfly subdivision. The method comprises the steps of toroidal cutter surface modeling and triangular grid free-form surface modeling. Besides, the cutter surface of a cutter contact point (CC point) and a workpiece surface are geometrically analyzed with combination of the geometrical features of the toroidal cutter. The minimum front inclination angle of the cutter is calculated according to the principle of cutting cutter interference so as to obtain the maximum width of a cutting path, based on which subdivision is performed on the triangular grid surface by adopting the improved Butterfly subdivision method so that the line space of the cutter path is enabled to meet the width requirement of the cutting path. Planning of the spiral cutter path cutter contact point (CC point) is performed line by line along the boundary of the triangular grid with a surface contour curve acting as an initial cutter path so that the position of a cutter center (CL point) is finally solved according to the toroidal cutter geometrical model. The method is applied to high-speed machining so that continuity of the formed cutter path can be enhanced, cutter load fluctuation can be reduced, and cutting stability can be enhanced and the service life of the cutter can be prolonged under the premise of guaranteeing the cutting quality.

The invention provides a stabilizing ultra-hydrophobic surface controllable design method based on geometric analysis, relating to the fields of material research modeling and simulating material (compute) design, which is characterized in that firstly establishing parallel grating shaped or circular pit and other regular shaped microstructure surface model, according to the established microstructure feature, deriving the apparent contact angle theory predictor formula of the liquid droplet on the microstructure surface based on Wenzel theory and Cassie theory; at the same time, analyzing the C/W converting process on the microstructure surface from the geometric angle; then, pre-designing the geometric parameter of the established microstructure surface model, calculating the apparent contact angle of the liquid droplet on the microstructure surface by the apparent contact angle theory predictor formula derived above, determining whether the designed microstructure surface has ultra-hydrophobicity; at last, calculating h0 of pre-designed microstructure geometric parameter and the corresponding apparent contact angle derived from calculation, judging whether the designed microstructure surface has ultra-hydrophobic stability. The invention is direct viewing, and is easy to operate, which has strong controllability.

The invention discloses a human body posture mapping method applied to action imitation of an anthropomorphic robot. The method comprises the following steps that 1) the three-dimensional position information of notes of human skeleton series is acquired through a depth camera; 2) vectors of the human skeleton series are constructed according to the notes of the human skeleton series, virtual human joints are established according to the vectors of the human skeleton series and the robot joint structure so as to form a human skeleton model; 3) a connecting rod reference coordinate system basedon connecting rods of the human skeleton model is established; 4) the human body mapping joint angles are calculated by utilizing the human body connecting rod skeleton vectors according to the structure characteristics of robot joints; and 5) the human body mapping joint angles are applied to robot joints according to the limit of each joint angle of the robot. The method has the advantages thatthe human body mapping joint angles can be accurately calculated by adopting a geometric analysis method based on the connecting rod skeleton vectors and the virtual human joints, the human body posture can be mapped to the robot end through the joint angles, and therefore the calculation loss is low, and the accuracy is high.

A method and system for aiding piloting when selecting a trajectory of approach of an airport or airfield, implemented on at least one processor, includes a first step of selecting a landing airport or airfield, and a second step of determining, for said landing airport or airfield, all or part of the possible trajectories of approach associated with a landing runway, on the basis of a database of the airports or airfields. A third step determines, for at least one of the possible approaches, whether or not said approach is compatible with an angular guidance mode, by geometrical analysis of the approach; and a fourth step displays all of said possible approaches, for said landing airport or airfield, and of displaying the compatibility with said angular guidance mode for the approaches analyzed.

The invention provides a method for designing a stable superhydrophobic surface of a grating structure, and relates to the field of the design research of the superhydrophobic surface. The method comprises the following steps of: first, deducing the relationship between the structure parameter of the surface of the grating structure and the superhydrophobic performance requirement of the surface, and determining the structure parameter of the surface according to the relationship; then, calculating a contact angle formed by the liquid level inside a surface groove and the groove wall according to working conditions of liquid, and simultaneously calculating the distance from the lowest point to the bump top of the liquid level; and finally, determining the state of the liquid on the surface through the calculated contact angel and distance, and adjusting the parameter if the liquid is in a Wenzel state so as to realize stable superhydrophobic performance. The stable superhydrophobic surface is designed by a geometric analysis method according to the micro-contact form of the liquid and the microstructure surface so as to ensure visualization of the design process.