83results about How to "Realize 3D measurement" patented technology

The invention discloses a measuring method for length, width and height of a vehicle based on an RGB-D camera. The method comprises the steps of acquiring a clear vehicle image in a camera short-distance mounting manner, calibrating the camera according to a calibrating method based on a disappearing point, obtaining an internal parameter and an external parameter of the camera, realizing three-dimensional point cloud conversion of a vehicle target in a world coordinate system through a camera depth image solution, and acquiring three-dimensional coordinate information of the external surfaceof the vehicle; acquiring the three-dimensional coordinate of the external surface of the vehicle by means of prior knowledge and an image processing method, splicing a vehicle image according to sequence patterns in a vehicle motion process through a registering method, and realizing three-dimensional measurement to the profile of the vehicle. The measuring method overcomes defects of high equipment requirement and tedious operation in a traditional method and realizes high calibration precision. The actual displacement of the vehicle is comprehensively analyzed through a matching relation ofpoints which correspond with the same position of the vehicle in the image sequence, thereby realizing relatively high registering precision. The measuring method further has advantages of realizingaccurate splicing of the vehicle side surfaces, reducing vehicle length measurement error and improving accuracy in splicing the vehicle side surfaces.

The invention discloses a geometry measure system for a large workpiece in progress based on machinery vision. The system comprises an installation block of a machinery arm, a machinery arm, a camera, a light source frame, a digital control module of the machinery arm, an image collecting card and a computer. The installation block of the machinery arm is a convenient interface component for a built-in stepper motor and a transmission gear and is arranged on the shell of a machine tool spindle or a work-platform. The machinery which can stretch in a two-dimensional plane and rotate around two shafts is arranged on the installation block of the machinery arm, moreover, the terminal of the machinery arm clamps the camera; the light source frame is arranged on the upward side of the workpiece. One end of the digital control module of the machinery arm is connected with the machinery arm and the other end is connected with the computer. The computer is also connected with the camera through the image collecting card. The measure system adopts the camera to take the image of the measured object and calculates measurement result after image analysis; the system fully adopts the visible image method and has no requirement for a laser light source, a laser gauge head, a contact-type trigger gauge head and other mechanisms, moreover, the system saves the expensive cost of the laser mechanism and is not limited by the contact-type measurement method.

The invention provides a method for detecting any defect in the inner wall of a hole by an optic way, which comprises the following procedures: a light pickup picks up an image formed by laser after reflecting on the inner wall of the hole, so as to get the depth at any point on the inner wall of the hole; the light pickup picks up an image formed by an illumination light after reflecting on the inner wall of the hole, so as to get the explored image of the inner wall of the hole and get the 2D sizes of the defect; and the 3D info on the defect is obtained by combining above two dimensions. By combining laser measurement with illumination light measurement, it is not only possible to get the 2D size of the defect, but also is possible to get the depth of the defect, so as to achieve 3D measurement of the defect; the use of a non-contact measuring way avoids any contact wear between a probe and the object to be measured, and improves the inspection speed.

The invention discloses a three-dimensional flow field image measurement device and method adopting a single lens, which are characterized in that a polarized light source is used for illuminating a flow field to be detected; light from a camera lens is divided into two paths through a light splitting prism and polaroids are respectively used for carrying out polarization detection for the two paths; two CCDs (Charge Coupled Device) or CMOS (Complementary Metal-Oxide-Semiconductor Transistor) image sensors are respectively used for imaging; a relative gray level of a corresponding tracer particle in two pictures can be used for judging whether the tracer particle is located in front of a focusing plane or in back of the focusing plane; the distance between the position of the tracer particle and the focusing plane is computed according to the size of a defocusing amount of the tracer particle of the single picture, so as to only determine a three-dimensional position of the tracer particle; and a movement fuzzy parameter is combined to further obtain a three-dimensional movement speed of the tracer particle, namely the information of a three-dimensional flow field is obtained. The three-dimensional flow field image measurement device and method adopting the single lens have the beneficial effects that the three-dimensional measurement of a transient flow field can be realized by only one camera lens, a measurement system and a data processing process are simplified, and the system cost is reduced.

The invention provides a fast high dynamic range three-dimensional measurement method. The method comprises the steps that a four-amplitude grating strip is generated by a computer; two polarizer are respectively placed on the optical axis of a projector and the optical axis of a camera; any one polarizer is rotated; the angle between the optical axis of the projector and the optical axis of the camera is set to be 90 degrees; the projector is used to project the generated four-amplitude grating strip to an object to be measured; the camera is used to synchronously shoot a four-amplitude strip image generated by the reflection of the object to be measured; the four-amplitude strip image is analyzed to acquire a high frequency wrapped phase and low frequency phase; the high frequency wrapped phase is unwrapped to acquire a high frequency unwrapped phase; and according to the unwrapped phase, the three-dimensional scene of the measured object is reconstructed. The fast high dynamic range three-dimensional measurement method provided by the invention can carry out high dynamic range three-dimensional measurement on a dynamic scene.

The invention discloses a three-dimensional measuring method for a complex large object based on stripe period correction. The measuring system comprises a projector, a measuring bracket, a camera, a computer and a reference plane, wherein the projector and the camera, on the same level, are placed on the measuring bracket, and are connected with the computer through wires respectively; an object to be detected is placed on the reference plane. The three-dimensional measuring method has the advantages that (1) a five-step phase moving method based on stripe period correction is proposed; (2) a time phase expansion method based on stripe period correction is proposed; (3) the operation is convenient and practical, and the high-accurate three-dimensional measuring of the complex and large object is realized.

The invention discloses a system for measuring a three-dimensional volume scattering function of a microparticles in water. The system comprises a parabolic spherical reflector, a sample pool, a telescope group, a photoelectric detector and a computing processing unit, wherein the sample pool is arranged in a reflector cavity of the parabolic spherical reflector, the center position of the sample pool is located in a parabolic spherical focal point of the reflector cavity of the parabolic spherical reflector, incident light is converged at the reflector cavity focal point position, incident to a parabolic spherical surface after being subjected to particle scattering in the sample pool, transformed into parallel scattered light, received by the photoelectric detector after passing through the telescope group, and transmitted to the computing processing unit for processing, and thus, the three-dimensional volume scattering function of the microparticle can be obtained. The invention further discloses a method for measurement by utilizing the system. According to the invention, the problem of detection deviation generated when a plurality of detectors are used for detecting the volume scattering functions of different angles is avoided, the acquired image is good in uniqueness and high in contrast ratio and can be completely fixed in a work process, and the measuring stability is good and the measuring speed is high.

The invention provides a non-contact three-dimensional measurement device and a non-contact three-dimensional measurement method for the particle movement of a fluidized bed. Gamma ray detectors arranged in an orthometric manner at the same height capture tracer particles and give out gamma rays; the gamma ray detectors convert the gamma rays into electric signals; the electric signals are processed by a sensitive signal amplifier, a converter, a forward analogue-digital sampler and a lateral analogue-digital sampler to respectively generate a forward perspective view and a lateral perspective view; and then the three-dimensional movement process of the particles is reconstructed through a three-dimensional image reconstruction module. The measurement device and the method provided by the invention employ safe ray for imaging so that three-dimensional, real-time, accurate and safe measurement of the particle movement of the fluidized bed is realized without affecting a flow field.

The invention provides a method to measure the three-dimensional distortion of the object by the spatial carrier frequency electron speckle interference. It illumines the object by the three coherent lights of the horizontal, the vertical and the vertical to the surface of the object directions; it leads the carrier wave by controlling the deflection of the reflector in the horizontal and the vertical direction to adjust the interference fringe of the displacement field; it adjusts the interference fringe of the off-face displacement field by the deflection of the object. It gets the phase position of every distorted field by the Fourier transformation to reach the measurement of the three dimensions. The invention has the high delicacy and precision, soothe precision can be improved to 1/20 waves.

The invention relates to a laser range finder calibration method for three-dimensional measurement. The method comprises the following steps: installing a camera and a laser range finder on the same rotating platform of a two-dimensional turntable to form a camera-laser range finder combined system, adjusting the laser axis of the laser range finder to be approximately parallel to the optical axisof the camera, ensuring that a laser spot is located in the view field of the camera, and keeping the relative positions of the camera and the laser range finder fixed after installation; placing a laser spot receiving target plane in front of the constructed camera-laser range finder combined system, so that laser spots of the laser range finder are projected to the laser spot receiving target plane; establishing a three-dimensional coordinate system in the optical center of the camera; obtaining the relationship between the laser spot pixel coordinates and the measurement distance of the laser range finder; meanwhile, enabling the camera to collect a laser spot image at each position and extract the mass center of a laser spot; obtaining a relation equation between the laser spot pixelcoordinates and the measurement distance of the laser range finder, and completing the pre-calibration of the laser range finder.

The invention discloses an analog measuring device and method for the surface potential of an insulator in a GIL. The analog measuring device comprises a closed cavity, the insulator, an electrostaticprobe and a high-voltage electrode guide rod. Air inlet and outlet are formed in the cavity wall surface of the closed cavity. A guide rail is installed in the closed cavity, and a first shielding cylinder and the insulator are arranged at one end of the guide rail. The insulator is rotatably disposed in the first shielding cylinder through a high-voltage electrode support rod. A second shieldingcylinder is arranged at the other end of the guide rail, and the second shielding cylinder is internally provided with the high-voltage electrode guide rod. The first shielding cylinder and the second shielding cylinder are both grounded. The electrostatic probe is movably disposed in the closed cavity, and the electrostatic probe can measure the surface potential of the insulator. The analog measuring device can complete the analog measurement of the surface potential of the insulator in the high-pressure closed cavity, and can simulate the working environment of the insulator of the GIL inreality, the measurement result is high in credibility, and theoretical guidance can be provided for actual production.

The invention discloses a three-dimensional disturbance stress testing method for stope surrounding rock. The method comprises the following steps: arranging a testing meter at a to-be-measured pointof a surrounding rock drill hole, wherein at least six strain sensors which are not parallel to one another are arranged on the testing meter, and the distances from the strain sensors to the testingmeter are equal; filling the gap between the testing meter and the drill hole with colloid, so that the testing meter and the surrounding rock are solidified into a whole; and acquiring strain data ofthe to-be-measured point through the strain sensors, acquiring azimuth information of the strain sensors, combining a drill hole surrounding rock strain distribution formula of elastic mechanics according to elasticity modulus and Poisson's ratio of an occurrence body of the strain sensors and the azimuth information of the strain sensors, converting the strain data into disturbance stress data of surrounding rock, and further obtaining the disturbance stress state at the measuring point.

The invention discloses a water surface target measuring method and relates to three-dimensional measurement of computer vision. A calibration device with a leveling function is used for determining that a reference plane is parallel to the water surface, and the water surface target measuring method is derived according to the imaging principle of a camera and the single-view computer vision theory. The method comprises steps as follows: configuring equipment for water surface target measurement, determining that the reference plane is parallel to the water surface, acquiring images, calculating the internal parameter of the camera, solving the normal vector of the water surface, adding a target height calculation module when necessary, performing measurement reconstruction, performing Euclidean reconstruction from measurement reconstruction and performing error analysis. The method overcomes defects that existing water surface target measuring methods are time-consuming, labor-consuming, unsafe and complex and measurement results are unstable.

The invention provides a digital grating and physical grating combined tiny object surface three-dimensional measurement system which is composed of a computer, collimated laser beams, a digital micromirror device (DMD), digital gratings, physical gratings, three lens groups, an object to be measured, an object table and a CCD image detector. The computer generates light and dark graphs to be transmitted to the DMD. The collimated laser beams irradiate the DMD to be reflected and then generate the digital gratings through the first lens group, and then the digital gratings reach the surface of the object to be measured on the object table through the second lens group. The digital gratings modulated by the object to be measured are imaged on the surface of the physical gratings through the second and third lens groups. The digital grating and the physical gratings are superposed at a certain gap, and multiple times of diffraction occurs so that the amplified Moire interference fringes are formed and then imaged on the CCD image detector, and image acquisition and processing are performed through the computer so that three-dimensional information of the object to be measured can be acquired. The system is high in precision, easy to operate and high in anti-interference capacity and has high application value.

The invention is suitable for the technical field of three-dimensional medical model application, and provides a method for webpage displaying of a three-dimensional medical model, and a system thereof. The method comprises the steps as follows: A, three-dimensional medical model data shown by a txt header file and a binary data file is transmitted to a client; B, the client analyzes the text header file and the binary data file by utilizing a scripting language to obtain the three-dimensional medical data; and C, the client utilizes the scripting language to call a shader module to display the webpage of the three-dimensional medical model on the three-dimensional medical model data. Therefore, the network transmission speed of the three-dimensional medical model data is increased, and the efficiency of the webpage displaying of the three-dimensional medical model is improved with the adoption of the method and the system.

The invention discloses an object three-dimensional measurement system and method based on structured light, and the system comprises a first parallel flat plate, a second parallel flat plate, a laser transmitting unit which is used for transmitting a laser beam to a measured object, and an image collection unit which is used for carrying out the image collection of the measured object. The first parallel flat plate is arranged according to a specified inclination angle and is perpendicular to the direction of laser beams emitted by the laser emitting unit, so that the laser beams emitted by the laser emitting unit are emitted perpendicular to the first parallel plate, and the second parallel flat plate is horizontally arranged and is located on the same horizontal plane with the laser emitting unit. The image collection unit is arranged above the second parallel flat plate in parallel; the method is a measurement method using the measurement system. The measurement system and the measurement method have the advantages of being simple in structure, high in measurement efficiency and precision, high in anti-interference performance, wide in application range and the like.

The invention relates to the optics electronic measurement technique field, and especially relates to a three-phase unit characteristic point matching method, a measuring method and a three dimensional detection device; the measuring method comprises the following steps: b1, collecting images, and finding a unique matching point set corresponding to all characteristic points in a base image plane; b2, calculating space position coordinates of viewed points according to the image coordinates of the unique matching point set obtained in step b1; b3, forming three dimensional point cloud data according to the viewed point space position coordinates obtained in step b2, building a three dimensional point cloud graph, and rebuilding a three dimensional stereo image. The advantages are that 1, the method and device can match the versatility and uniqueness of viewed points respectively imaging on three cameras; 2, the method can realize three dimensional measurement of the viewed object; 3, the method can fast realize three dimensional perception and measurement; 4, the method uses less cameras, thus reducing application cost.

A method for generating digital distortion model includes setting up and shooting control field, selecting four corner marks and making their distortion zero, leading projective difference in for realizing true 2-D control field transform, measuring out actual position and calculating out theoretical position of each control mark and confirming total distortion of each control mark, obtaining total distortion for each picture element to generate the model by interpolating based on total distortion of four marks nearest to picture element to be measured.

The invention belongs to the technical field of measurement, and provides a single-camera double-spherical-mirror image binocular vision measurement system and method. The measurement system is composed of an industrial camera 2, an optical lens 3, a small spherical mirror 6, a large spherical mirror 7, a mechanical support 4, a data transmission line 5, a computer 8, a calibration target 11 and a power supply 12, wherein the industrial camera 2 is mirrored into a left virtual camera 13 and a right virtual camera 14 through the large spherical mirror 7 and the small spherical mirror 6, and the left virtual camera 13 and the right virtual camera 14 form a mirror binocular. According to the measurement method, the calibration target 11 is used for calibrating imaging model parameters of a virtual camera, structure parameters of the mirror binocular and an essential matrix, a measured object 10 is arranged in a view field range 9 of a mirror binocular sensor 1 and is received by the industrial camera 2 after being reflected by the small spherical mirror 6 and the large spherical mirror 7, the formed image is collected into a computer to be processed, the image coordinates of the measurement points are extracted, and the three-dimensional coordinates of the measurement points of the measured object are calculated according to the measurement model. The view field range of a single-camera mirror binocular system is expanded through spherical mirror reflection imaging, the contradiction between the view field range and the system size in binocular vision measurement is solved, the synchronous requirement of image acquisition of a traditional binocular measurement system composed of two cameras is avoided, the complexity of binocular vision measurement operation is reduced, the measurement precision is improved, and the application field of binocular vision measurement can be widened.

The invention belongs to the field of fluid measurement and discloses a three-dimensional wake field testing device which comprises a bracket, sensor bases, a guide ring, guide rods and guide blades;the bracket is used for connecting a component to be tested; the sensor bases are arranged on the guide ring and are used for mounting sensors; the guide ring comprises an inner ring and an outer ring; and multiple guide rods are distributed on the inner ring and the outer ring respectively and are used for connecting the guide blades and the guide ring. By adopting the three-dimensional wake field testing device provided by the invention, the guide rods realizes regulation of front-and-back relative positions of the outer ring and the inner ring by regulating self lengths so as to regulate measurement angles of the sensors; and the guide blades are distributed on the outer surface of the bracket and drives the inner ring and/or the outer ring to rotate by rotating along the outer surfaceof the bracket so as to drive the sensor bases to rotate, so that a measurement region of each sensor on the corresponding sensor base is regulated. Through the three-dimensional wake field testing device, the problems of difficulty in arrangement of the sensors, inconvenience in mounting and the like are effectively solved, a measurement result is accurate and visual, and very large help is provided to performing, operation and data collection of a water test.

The invention discloses a natural gas hydrate decomposition stratum deformation measuring device, which is used for being installed in a natural gas hydrate reaction kettle, wherein the reaction kettle is used for simulating a natural gas hydrate geological stratum, and the geological stratum is divided into an upper covering layer, a sediment layer and a lower covering layer from top to bottom. The deformation measuring device comprises a displacement sensor fixing plate, displacement sensors and a flexible elastic panel, wherein the plurality of displacement sensors are evenly distributed, one end of each displacement sensor is fixedly installed in the displacement sensor fixing plate, and the other end of each displacement sensor is telescopic and fixed in the flexible elastic panel ina sealed mode; and the flexible elastic panel is tightly attached to the upper covering layer, and the displacement sensor fixing plate is fixedly installed in the reaction kettle. The natural gas hydrate decomposition stratum deformation measuring device not only can measure stratum deformation caused by large-scale natural gas hydrate decomposition, but also breaks through the limitation of one-dimensional measurement of stratum deformation, and realizes three-dimensional measurement of stratum deformation.

The invention relates to the technical field of laser radars, and provides a three-dimensional laser radar based on a liquid crystal on silicon and a scanning method. A transmitting light source and areceiving detector are arranged on one side of a polarization device in a common optical axis mode. A transmitting optical assembly is located on a transmitting optical path between the transmittinglight source and the polarization device. A receiving optical assembly is positioned on a receiving optical path between the receiving detector and the polarization device. A liquid crystal on siliconis arranged on the other side of the polarization device and used for reflecting the emitted light polarized by the polarization device to a to-be-measured target object at a first specified angle and reflecting the received light reflected back from the to-be-measured target object at a second specified angle. According to the invention, different phase distributions are downloaded by using theliquid crystal on silicon to realize two-dimensional measurement of the length and width dimensions of the to-be-measured target, the height dimension of the to-be-measured target is measured throughlaser beams of two polarization states, so that the three-dimensional measurement of the to-be-measured target is realized.

The invention discloses an insulating medium space charge measurement method and system based on a magnetoacoustic system. The method comprises the following steps: a time-varying magnetic field is applied in an insulating medium, and the time-varying magnetic field then generates an annular induced electric field in the insulating medium; space charges in the insulating medium vibrate under the action of an induced electric field to generate sound pressure signals, a sound sensor array is arranged outside the insulating medium, the sound pressure signals in all directions are recorded, and the two-dimensional or three-dimensional distribution condition of the space charges in the insulating medium can be obtained through an inversion algorithm. According to the method, a magnetic field source is not in contact with a measured object, charge vibration is measured through sound waves generated by vibration or electric signals generated by external electrodes of a medium, and two-dimensional and three-dimensional measurement of space charges is achieved.