352 results about "Three dimensional deformation" patented technology

The invention discloses a high-temperature three-dimensional digital image related measurement system and a high-temperature three-dimensional digital image related measurement method. The system comprises a digital camera, an imaging lens, band-pass optical filter, a monochromatic light source, a calibration board, a support system and a computer, wherein the support system consists of a triangular bracket, a guide rail and a translation stage; and the computer is used for acquiring a digital image and performing analysis processing. The measurement method comprises five steps. In the system, the band-pass optical filter is arranged in front of the imaging lens of the digital camera, so that the influence of the thermal radiation of a high-temperature object on the brightness enhancement of an acquired image of the camera can be reduced effectively. In the measurement, a measured object is lighted by adopting the monochromatic light source of which the lighting wavelength is positioned in a band-pass range of the band-pass optical filter. By using the system and the method, a brilliant image of the surface of the high-temperature object at the surface temperature of over 500 DEG C is acquired, wherein the image can be directly analyzed and processed by a three-dimensional digital image related method to acquire the three-dimensional morphology of the surface of the high-temperature object and a three-dimensional deformation field under the action of a thermal load. The system has a compact structure, is convenient to operate, and has a wide application range and high measurement precision.

The invention discloses a multi-source monitoring technology fusion-based ground subsidence integrated monitoring method. The method comprises laying benchmarks and GPS monitoring points in a ground subsidence focal monitoring area, laying a CR-GPS-benchmark integrated point in a ground stable region, in the same time sequence, acquiring GPS data, ground meteorological data, MODIS data, SAR images and leveling data, calculating GPS data through the combination of synchronous observation data from surrounding CGPS stations and IGS stations and ground meteorological data, calculating atmospheric delay phase information through the combination of GPS data, ground meteorological data and MODIS data, extracting stable PS point and PS point deformation information in an initial differential interferometric phase map, building a ground subsidence vertical deformation field through deformation formation corresponding to the PS points, GPS points, benchmarks and integrated points, constructing a spatial data field through fusion of a horizontal deformation field and a vertical deformation field and acquiring ground subsidence three-dimensional deformation field information having high temporal-spatial resolution. The method can acquire ground three-dimensional deformation information with a large range, a high precision and high temporal-spatial resolution.

The invention belongs to the technical field of turbine blade performance detection in the aviation industry, in particular to a simulation test method of thermal fatigue failure of a blade with thermal barrier coating. The method can simulate the thermal fatigue work environment of temperature alternating circulation of various blades in an aircraft engine with high performance, and simultaneously tests and analyzes data, such as temperature, temperature gradient, surface topography image evolution, three dimensional deformation field, three dimensional displacement field, interface oxidation layer and thickening rule thereof, thermal fatigue flaw initiation and expansion, cooling airflow and the like of a blade sample with a thermal barrier coating, thus realizing real-time monitoring of three dimensional thermal strain and stress of the blade in the process of thermal fatigue experiments, and providing an important means for predicting thermal fatigue damaging position and invalidation time of the blade. The experimental data obtained by the method can provide important experiment basis for effectively evaluating the failure mechanism of the aircraft engine blade in the environment of high-temperature gas and predicting ceramic coating dropping position, dropping time and service life.

The invention discloses a method for obtaining mining area earth surface three-dimensional deformation fields through a single interferometric synthetic aperture radar (InSAR) interference pair. The method includes that a mining field radar sight deformation field is obtained through an InSAR technology, pixels with coherence which is lower than an unwrapping threshold value in the sight deformation field is subjected to spatial interpolation to obtain a spatial continuous deformation field, main effective radius of each pixel is calculated through mining area working face distribution and main effective angles, after mining area horizontal shifting coefficients are obtained, the mining area earth surface horizontal shifting is converted to an expression of a sinking value, an equation set is formed according to the radar imaging principle, the equation set is solved to obtain a solution of the earth surface sinking value, according to the sinking value, tilting values of east, west, south and north directions are calculated, and the deformation fields of the east, west, south and north directions are calculated according to a proportional relation among the tilting values of the east, west, south and north directions and the horizontal shifting. The method has the advantages that the restrictions that when the three-dimensional deformation field is solved by the aid of the InSAR, the requirements for data are strict, the monitoring cost is high and the like are broken, and the application space of the InSAR technology in the mining area is greatly widened.

The invention provides a multi-vision-based bridge three-dimensional deformation monitoring method which comprises the following steps of: (1) obtaining the images of calibration plates and extracting the feature points on the multiple calibration plates by multiple video cameras respectively; (2) establishing a mapping model based on a BP neural network; (3) obtaining each video camera image at the bridge edge feature points; (4) eliminating the error point pairs by use of RANSAC to obtain the correct matching point pairs; (5) extracting the two-dimensional coordinates of each video camera image at the bridge edge feature points, obtaining the three-dimensional world coordinates of the feature points according to the mapping model based on BP neutral network, and drawing a three-dimensional curve of the bridge surface; and (6) extracting the bridge deformation rule according to the bridge curves of the bridge at different moments, and judging the bridge deformation trend. The method provided by the invention can perform non-contact three-dimensional measurement on the bridge deformation, and has the advantages of continuous measurement, instant measurement, synchronous measurement of multiple points, high precision, repeatability, low cost and the like.

The invention provides an InSAR point cloud fusion and three-dimensional deformation monitoring method for a high-resolution SAR image. The method comprises the following steps of selecting a proper time sequence DS-InSAR technology to respectively carry out interference pair combination and single-view interference processing on multi-time-domain data of each platform according to a space-time baseline, introducing external DEM data to weaken dense stripes caused by the regional terrain, and carrying out nonLocal filtering and coherence revaluation on an obtained differential interference pattern to obtain an optimal parameter estimation value; and correcting a coded elevation value of each distributed scatterer by utilizing a terrain residual estimated value, acquiring three-dimensionalgeodetic coordinates of all DSs, and accurately registering and fusing a plurality of platforms DS point clouds by utilizing an ICP technology. According to the method, the multi-source SAR data is accurately fused, the mistake matching rate of observation values in a parameter estimation process is reduced, the precision and accuracy of monitoring are improved, and three-dimensional enhanced information of a research area can be obtained in combination with a small amount of ground control points.

The invention provides an object image characteristic points positioning method and an object image characteristic points positioning system, and belongs to the mode identification field. The object image characteristic points positioning method comprises the following steps: (1) inputting an object image, defining key points in object image characteristic points, and determining concrete positions of the key points in the object image; (2) taking coordinate average of characteristic points of a taken training sample as average characteristic points, according to the positions of the key points, subjecting the average characteristic points to two-dimensional deformation and three-dimensional deformation, and defining deformation results as initialization characteristic points of the object image; (3) based on the initialization characteristic points, positioning the object image characteristic points accurately. The object image characteristic points positioning system comprises a keypoint positioning apparatus, an initialization characteristic points acquiring apparatus and an object image characteristic points positioning apparatus. According to the method and the system of thepresent invention, accurate and rapid positioning of the object image characteristic points is realized, and the method and the system can be widely used in the image processing field and the like.

The invention discloses a pile-supported embankment transparent soil model testing device and method. The device comprises a model groove, transparent soil, a pile body, a water bag, a water pipe, an industrial camera, and a laser emitter. The box-type water bag is placed on the bottom of the model groove made of organic glass. A pile hole position is reserved in the box-type water bag. A pile hole is reserved in the box-type water bag. A pile can be inserted into the pile hole in the box-type water bag. Under the assistance of transparent soil, the soil arch effect of embankment soil under self-weight load can be simulated by discharging the water in the box-type water bag. The invention also discloses a testing method of the testing device. The testing method comprises steps of installing pile and water bag, constructing a transparent soil embankment, slowly discharging water from the water bag, taking pictures of the laser plane by the industrial camera during the water discharging process, and analyzing the pictures to obtain the three dimensional deformation characteristics. The provided device and method have the advantages that high precision realtime measurement on the internal deformation of soil can be achieved, the macroscopic shape change of spacial soil arch can be observed, multiple work conditions can be simulated, the size of the testing device is small, the test operation is convenient, and the efficiency is improved.

The embodiment of the invention discloses a method, device and a storage medium for reconstructing a three-dimensional model of a human body. The embodiment of the invention can acquire two-dimensional images of a human body to be reconstructed, mapping a two-dimensional image to a voxel space to obtain a voxelized result of the two-dimensional image, and then calculating the voxelized result by adopting a preset three-dimensional parameter regression network, and reconstructing a three-dimensional model of a human body based on the calculated three-dimensional deformation model parameters ofthe two-dimensional image; this scheme can map two-dimensional image to voxel space before calculating three-dimensional deformation model parameters, so it can avoid the problem of poor accuracy caused by two-dimensional image information loss, and can greatly improve the accuracy and effect of three-dimensional model reconstruction.

The invention provides an on-line monitoring method of overall three-dimensional deformation of wind wheel blades in working states. The on-line monitoring method comprises the steps of selecting a wheel hub center as a fixed mark point, selecting another mark point at the root of each blade, and adopts marks in different shapes before a wind generator unit operates, obtaining overall three-dimensional coordinates of the wind wheel blades in static states with two digital cameras, when the wind generator unit operates, determining rigid body rotation angles of the wind wheel blades according to relative positions of the mark points in the working states and the static states, calculating to obtain the three-dimensional coordinates of the deformed wind wheel blades in the working states according to image plane coordinates after removing rigid body rotation displacement, and obtaining overall three-dimensional displacement values and strain values of the wind wheel blades in the working states according to differences of the three-dimensional coordinates before and after the deformation of the wind wheel blades. The method has the on-line, non-contact, overall and three-dimensional advantages and the like, can obtain overall three-dimensional displacement and strain of the wind wheel blades in the working states, and achieves monitoring of the deformation of the wind wheel blades in the working states.

The invention discloses a device and a method for synchronously measuring three-dimensional deformation and temperature with a single camera under a high temperature environment. The surface of a measured object is shot by adopting a color CCD (Charge Coupled Device) camera via a single-camera binocular imaging system, equivalently, the surface of the measured object is shot is shot by two virtual cameras from different angles, so that a binocular visual effect is achieved; a computer extracts blue light information, and three-dimensional shape and three-dimensional deformation of the surface of the measured object are calculated in real time by adopting a three-dimensional digital image related algorithm; meanwhile, the full-field temperature of the surface of the measured object is calculated by using the red light information and green light information of the color CCD camera and using a colorimetric method based on a reference temperature calibrated by an infrared temperature measurer. The three-dimensional deformation and full-field temperature of the object under the high temperature environment can be synchronously measured by using a single camera; the whole device is simple in design and convenient to operate, and is applicable to synchronous real-time measurement of three-dimensional deformation and full-field temperature of the object under the high temperature environment in engineering field.

The invention provides a foundation pit engineering three-dimensional monitoring network realization method based on distributed optical fiber sensors, which relates to a scheme of laying optical fiber sensors on an enclosure and support structure, overall deformation and force bearing analysis on the enclosure and support structure and generation of a strain distribution cloud map. Based on the characteristics that the frequency changes of back Brillouin scattering light formed by scattering of optical wave molecules of the optical fibers and incident light are sensitive to strain and temperature and BOTDA sensing advantages and benefiting from the accurate, stable and real-time monitoring advantages of the optical fiber sensors, the optical fibers on the components are arranged to a three-dimensional monitoring network, comprehensive and three-dimensional deformation and force bearing monitoring can be carried out on enclosure and support components and other components in the foundation pit project, real-time monitored data are guided to surfer to generate a structure strain distribution cloud map, and the method of the invention is a visualized and three-dimensional monitoringmeasurement and control method.

The invention discloses a method for measuring the deformation of a large-sized work-piece, which comprises the following steps of: firstly, placing a fixed point; secondly, sticking a deformation point; thirdly, sampling and shooting a picture; fourthly, rebuilding the information of the deformation point; fifthly, combining the coordinates; sixthly, resetting the ID of the deformation point; and seventhly, calculating the deformation quantity. By the operation steps, the invention can measure the direction and size of the three dimensional deformation of the large-size workpiece, which is caused by the applied force load, thermal load, etc. The method has the characteristics of easy operation, no restriction of the size of the workpiece, abundant measurement information, precise and reliable results, high efficiency and non-contact measurement.

The invention relates to a three-dimensional deformation measuring system and a three-dimensional deformation measuring method combining speckle correlation and speckle interference. The system comprises a laser, wherein laser light emitted by the laser passes through a semi-permeable and semi-reflective mirror after being expanded for illuminating a tested object and a reference object surface respectively; the tested object surface and the reference object surface are imaged simultaneously on the target surface of a CCD (Charge Coupled Device) camera through an imaging lens by means of the semi-permeable and semi-reflective mirror; the semi-permeable and semi-reflective mirror is arranged obliquely at an angle of 45 degrees relative to incident rays; and when a reference path exists, object surface speckles and reference surface speckles are interfered with mutually on the target surface of the CCD camera to form an interference speckle image for measuring an off-plane displacement component. A reference substance light path is removed, a speckle image on the object surface is acquired, and two components of in-plane displacement are calculated by using two speckle images acquired before and after deformation. A typical digital speckle light path which is sensitive to the off-plane displacement is utilized, so that the in-plane displacement and speckle interference off-plane displacement of a speckle relevance measuring object are realized, and three-dimensional displacement measurement is realized; and and the system and the method have the advantages of simple light path, and easiness and rapidness for operating and processing data.

The invention discloses a method for monitoring and resolving three-dimensional ground surface deformation of an industrial and mining area by means of a multi-source SAR image. The method is based on SAR image data of different rails before and after deformation. Deformation information in different radar satellite visual line directions are obtained through combining D-InSAR technology and Offset-tracking technology. Deformation information in different radar satellite azimuth directions is acquired through combining MAI technology and Offset-tracking technology. Based on this fact, different deformation information monitoring precisions in the viewing line direction and the azimuth direction are considered. Weights are determined in a Helmert variance component estimation manner. A three-dimensional land surface deformation conversion model is established and resolved, thereby obtaining a three-dimensional deformation field of the industrial and mining area. The method can settle a problem of easy restriction by factors such as decorrelation and small monitorable deformation gradient. Furthermore, the true ground surface deformation condition is more comprehensively monitored through the multi-source SAR image.

The invention discloses a mining subsidence monitoring and early warning method based on multi-source data. The mining subsidence monitoring and early warning method comprises the steps of: (1) acquiring standard data and GPS (Global Position System) data; (2) generating mine area DEM by utilizing Matlab software; (3) carrying out dual-rail difference interference process by virtue of DEM and SAR images to obtain a mine area surface deformation result; (4) correcting the mine area surface deformation horizontal and vertical monitoring results respectively according to GPS and standard monitoring data so as to obtain a high-accuracy three-dimensional deformation monitoring chart; (5) establishing an early warning model and a corresponding database; (6) repeating steps (2)-(5) according to the multi-phase measured data and InSAR data until the process is finished; (7) establishing time sequence and buffer analysis models of sinking, horizontal shifting, inclining, curvature deformation and the like of a subsidence area; and (8) determining the influence area according to the time sequence and buffering analysis models and achieving early warning. The mining subsidence monitoring and early warning method integrates standard data, GPS data and SAR data organically, so that the accuracy of the monitoring result is greatly improved.

The invention discloses an underground engineering and deep foundation pit unattended real-time monitoring early warning system and a working method thereof. The system consists of a field sensor, a data wireless acqusition and transmission system, an engineering management platform and a data receiving and analysis early warning platform, wherein the field sensor is connected with the data wireless acqusition and transmission system; the engineering management platform, the data receiving and analysis early warning platform are connected with the data wireless acqusition and transmission system through wireless communication. According to the system, the low-power-consumption acqusition module of the wireless acqusition and transmission system is connected with the field sensor through the wireless communication, data is transmitted to the data receiving and analysis early warning platform through the transmission system, and mounting and use are convenient; the engineering management platform is a multi-functional engineering management platform; system software can be used for simultaneously performing automatic monitoring of water level, supporting axial force, internal horizontal displacement, site surface horizontal displacement and tunnel three-dimensional deformation.

The invention belongs to the technical field of three-dimensional detection of subway tunnels, and discloses a vehicle-mounted measurement device of three-dimensional deformation monitoring of subwaytunnels based on reference transmission. A rotatable laser distance measurement system for high-speed distance measurement and angle measurement is integrated by a laser range finder, an inclination angle sensor, a high-precision turn table and a PLC controller together; a tunnel section outline is measured in a discrete multi-point mode; meanwhile, in combination with a photoelectric encoder installed on a distance measurement wheel at the bottom of a tunnel detection vehicle, a fixed displacement amount of the detection vehicle between a starting position and a travelling position on an axial direction of the tunnel is obtained, a program is triggered, and the detected data of the specific position in the tunnel are transmitted to an upper computer by a wireless communicator. The vehicle-mounted measurement device disclosed by the invention makes breakthroughs in the practical technical innovation of the online monitoring of the tunnel structure safety, lays a foundation for forminga technical system for the reliability design, analysis, test and evaluation of rail transit facilities, and has practicality in many fields.

The invention discloses a triaxial test three-dimensional deformation reconstruction and measurement method and belongs to the technical field of geotechnical experiment testing. The method is characterized in that a transparent square pressure chamber is adopted, a specially-produced rubber membrane whose label can be tracked is marked, two digital cameras at the front and at the back and a corresponding image acquisition control and processing system are employed, through tracking the position change of the angle points of the rubber membrane on an image, a certain hypothesis is adopted to obtain the space coordinate of the characteristic points of the rubber membrane on the surface of a sample, and the images acquired by the two cameras at the front and at the back are spliced so that the measurement of the three-dimensional deformation of the sample during a triaxial test process is realized. Through combination with ANSYS finite element software, a three-dimensional deformation grid and a three-dimensional whole surface strain field of the sample are obtained. The method provided by the invention has the following advantages: the comprehensive deformation characteristics of the sample in the triaxial test process can be obtained from a front direction and a back direction, and the space positions of surface characteristic points in a triaxial test can be obtained for realizing reconstruction of three-dimensional deformation of the sample, and the distribution of the three-dimensional surface strain field of the sample can be obtained.

The invention discloses a three-dimensional deformation measuring method based on multi-camera matching. Marking points are pasted on components, and multiple cameras (> / =3) are adopted to photograph deformation images of the marking points on the surfaces of the components simultaneously. A photogrammetry technology and a stereoscopic visual technology are adopted to calculate three-dimensional coordinates of the marking points in each frame so that displacement and deformation of each marking point in loading are acquired.

This invention belongs to photoelectricity measuring technique field and relates to a self-collimation intervention measuring system which comprises 1 Number one light source, 2 diaphragm, 3 Number one beam splitter, 4 Second beam splitter, 5 Third beam splitter, 6 object lens group, 7 reflectoscope, 8 CCD detector, 9 Second light source, 10 self-collimation grating, 11 aiming grating, 12 CCD detector. The invention provides a new method for measuring the three-dimensional deformation of an object based on the principle of self-collimation intervention and solves the problem that background technique can't measure the three-dimensional deformation of an object. There are two main light paths in the self-collimation intervention system of this invention and one is self-collimation light path which can measure the two-dimensional deformation of an object and the other is grating invention light path which can measure one-dimensional deformation of a object. And the accuracy of the deformation measured is improved with the increase of the grating frequency by the use of grating invention.

For a device for connecting two pipes (1, 2) with different external diameters using a sleeve arrangement which bridges the butt joint between the ends of the pipe (1, 2) facing each other and contains at least a fixing sleeve (8, 8a) which can take up the clips (12, 13) for the two pipes (1, 2) and if necessary a sealing sleeve (3) which is surrounded by the fixing sleeve (8, 8a), high economy and safety can be achieved by the fact that each sleeve of the sleeve arrangement has cylindrical contact sections (5, 6; 10, 11) which can be adjusted to the different external diameters of the two pipes (1, 2) and are connected by a central section (7, 9) which can take a conical form to suit the diameter difference wherein the contact sections (5, 6) of the sleeve next to the external circumference of the two pipes (1, 2) can be brought into direct contact with the two pipes (1, 2) and the contact sections (10, 11) of the fixing sleeve (8, 8a) contain encircling mounting channels assigned to the clips (12, 13) and wherein the fixing sleeve (8) takes the form of a closed encircling ring which is suitable for three-dimensional deformation.

The invention discloses a mechanical sealing end surface deformation measurement system based on binocular vision DIC and a measurement method thereof. The system comprises a mechanical sealing test device, high-speed digital cameras, lenses, acquisition cards, a light source, a calibration plate, a support system, and a server for digital image acquisition and correlation analysis and processing. The measurement method altogether comprises eight steps. A speckle image on the surface of a mechanical sealing static ring in an operation condition can be acquired, the image can be analyzed and processed by directly using the binocular vision digital image correlation method, and thus, a three-dimensional shape on the surface of the mechanical sealing static ring, and a three-dimensional deformation field under effects of force and thermal load can be acquired. According to the method, the use is convenient, the measurement precision is high, the full-filed measurement problem of surface deformation under effects of force and thermal load of mechanical sealing can be effectively solve4d, and foundation is laid for making a research on key factors influencing mechanical sealing deformation and exploring measures for reducing deformation.

The invention relates to reappear three dimensional deformation of a vehicle body in a collision accident, including the steps: building an accident occurrence environment and finite element models for the related vehicles in the accident; verifying the reliability of the finite element models; selecting vehicle body key points adaptive to head-on collision and oblique collision and processing the holes in a numeric model; using three-coordinate measurer to physically measure the fixed key point positions; to a finite element model for the whole vehicle, adopting key point deforming measuring method; by multiple iterative optimization calculation, if finding the numeric simulated result of the deformed key points is consistent with the actual collision measured result at a certain speed and collision angle, determining the accurate automobile speed and collision angle at the occurring time of the accident. The invention can recover the accident on the condition that the trace of the wheels and other field information are destroyed or not clear, and has better objectivity because of making three-dimensional measurement on the measured points of the main energy absorbing components.

The invention provides a detection method of electronic speckles for synchronous carrier-frequency modulation in a three-dimensional deformation field. The method comprises the following steps: achieving short-distance illumination of three lasers and short-distance stack imaging on an object surface to be detected and a reference object surface by adopting a large-dislocation square prism; introducing carrier fringe patterns by deflecting the reference object surface, and then carrying out one-time modulation on a speckle interference fringe field lighted by the three lasers; when bending deformation occurs on the carrier fringe patterns under modulation of objection deformation after loading an object, independently measuring the deformed object by the three lasers, collecting the carrier fringe patterns before and after object deformation and the modulated carrier fringe patterns, and then respectively demodulating the carrier fringe patterns by a Fourier transform method to obtain a three-bitmap phase diagram containing off-plane and in-plane information; and finally carrying out phase operation to separate three components of a displacement field. By using the detection method, modulation of three speckle interference fringe fields by deflecting the reference object surface is achieved to obtain high-quality modulation fringe patterns. The method has the advantages of simple light path, relatively simple operation and high measuring precision.

The invention discloses an end-to-end three-dimensional face reconstruction method based on a single image. The method mainly comprises the following steps of 1, preparing a reference three-dimensional face model as a reference template, wherein the reference three-dimensional face model is in an expressionless state; and 2, performing two-dimensional representation on the reference template by using a triangular mesh parameterization method, obtaining a UV coordinate value corresponding to the reference template, and representing a space by taking UV coordinates of the reference template as areference position. The method achieves the effects that the three-dimensional face model can be directly represented by using a position diagram; a neural network is used for directly carrying out prediction; a three-dimensional deformation model is not needed, so that the end-to-end reconstruction process is achieved; and the precision of a reconstruction model is not limited.

The invention discloses a real-time measurement method for the dynamic three-dimensional deformation of an object and belongs to the technical field of laser measurement. The speckle patterns of an inplane X-direction measurement subsystem, an inplane Y-direction measurement subsystem and an out-of-plane Z-direction measurement subsystem are imaged on a CCD (Charge Coupled Device); the speckle patterns obtained by the CCD are subjected to Fourier transform to obtain a spectrogram; and the phase position variation of the object on the basis of time is obtained by the spectrogram so as to calculate deformation amount based on time to obtain the three-dimensional deformation amount of the whole object. By utilizing the real-time measurement method, a detection system is simplified, and the measurement precision and the measurement range are improved; and the real-time measurement method has the characteristics of real-time measurement, three-dimensional measurement, precise measurement, strong anti-interference performance, wide application range and the like.

The invention is applicable to the field of image processing and provides an estimation method and system for a lung motion model. The method includes: extracting a control point in a lung three-dimensional CT image of a reference phase; using a tracking position at a previous moment of the control point as a prediction position and tracking the position of the control point in a continuous-discrete-phase three-dimensional CT image; performing least-square curve fitting on the continuous-discrete-phase pursuit path of the control point and determining the motion position of the control point at any continuous time; and constructing a three-dimensional deformation model of the lung at a current time according to the motion position of the control point at any continuous time and obtaining lung motion position estimation of any voxel of the lung of the reference phase at any time. The estimation method and system for the lung motion model adopts an image registration algorithm based on a mark point so that the method is small in calculation quantity, high in calculation speed and capable of estimating the motion model of the lung effectively.

The invention discloses a method for segmenting a three-dimensional ultrasonic image, belonging to the technical field of the digital image processing. The method comprises the following steps: (1) preprocessing spots of the three-dimensional ultrasonic image by adopting a normalized anisotropic diffusion method of a three-dimensional wavelet according to the characteristics of the three-dimensional ultrasonic image to remove spot noise; (2) initializing the preprocessed three-dimensional ultrasonic image by adopting a Canny edge detection operator; and (3) segmenting the three-dimensional ultrasonic image three-dimensionally by using a B-Surface and GVF Snake based three-dimensional deformation model. The method disclosed by the invention can be used to rapidly and accurately segment the three-dimensional ultrasonic image and particularly has strong noise robustness. The method for automatically segmenting the three-dimensional ultrasonic image can be also used for segmenting other three-dimensional images such as CT (computed tomography) images, MRI (magnetic resonance images) and PET (position-emission tomography) images, thereby having high application value.