143 results about "3d measurement" patented technology

The invention discloses a space-time speckle projection three-dimensional imaging method based on multi-frame optical flow alignment. Firstly, a projector based on DLP is used for projecting a space-time speckle pattern to a measured scene, and a binocular camera synchronously collects a three-dimensional space-time speckle image. The calibration parameters of the binocular camera are used to carry out stereo correction on an acquired original speckle image, and a parallax image is generated frame by frame in combination with a coarse-to-fine single-frame speckle matching strategy. And estimating a two-dimensional inter-frame displacement field between continuous disparity maps by using an optical flow method by taking an intermediate frame disparity map as a reference, compensating motion artifacts in a space-time speckle image, and ensuring strict space-time registration of a dynamic target. And based on the speckle image after motion correction, a speckle matching strategy is expanded to a time-space domain, and high-precision multi-frame three-dimensional measurement of a complex dynamic scene is realized. The method is suitable for performing rapid and high-precision three-dimensional modeling on a moving target in an unstructured environment, and can perform accurate three-dimensional measurement on a high-speed dynamic target undergoing any translation or rotation motion.

The embodiment of the invention provides an optical system and 3D measuring equipment, and relates to the technical field of machine vision, the optical system comprises a polarization regulation and control module and a polarization module, the polarization module is used for reflecting a light beam in a first polarization direction and transmitting a light beam in a second polarization direction, and the polarization regulation and control module is used for regulating the polarization direction. The polarization direction adjusting module is used for adjusting the polarization direction of the laser beam from a first polarization direction to a second polarization direction; a light beam in a first polarization direction of the incident system is reflected by the module to enter the polarization regulation and control module along a first direction, is reflected by the polarization regulation and control module to enter the polarization module along a second direction, and is transmitted from the polarization module. Through the embodiment of the invention, light path folding is realized, the size of the optical system is reduced, the working size of the 3D measurement equipment is further reduced, the 3D measurement equipment can be more suitable for a narrow and compact space, ambient light interference is reduced, and the application scene is expanded.

The invention discloses an anti-shielding three-dimensional scanning measurement field construction method for large-size measurement, and belongs to the technical field of optical three-dimensional measurement. The method comprises the following steps: firstly, performing adaptive sampling based on geometric features of a workpiece to generate a candidate mark point set; secondly, constructing a virtual measurement scene, simulating a dynamic scanning process by using a ray tracing technology, and calculating the visibility and observation quality of each point under multiple viewpoints; then measuring precision is quantified by using a Fisher information matrix, and a layout optimization model which takes maximization of information gain as a target and meets coverage rate and engineering constraint at the same time is established; and finally, solving the model to obtain an optimal mark point subset, and verifying and outputting the optimal mark point subset. According to the method, the problems of measurement interruption, low point distribution efficiency and difficulty in guaranteeing precision caused by shielding of a large-size complex component in scanning are solved, and automatic construction of a high-robustness and high-precision measurement field is realized.

The invention relates to the technical field of three-dimensional measurement and digital twinborn assembly analysis, in particular to a part deformation analysis system based on three-dimensional measurement data driving, which comprises an anisotropic feature decoupling unit for acquiring sparse point cloud data of a flexible target object and generating a purified discrete feature set; the geometric illusion monitoring unit is used for generating an illusion entropy distribution diagram by using an implicit neural representation technology; the adaptive topology fidelity arbitration unit is used for generating a final deformation analysis report based on the illusion entropy distribution diagram; the deformation logic iteration unit is used for dynamically adjusting weight parameters of a resistance deformation decoupling model and a calculation strategy of the geometric illusion entropy according to a final deformation analysis report and downstream assembly feedback; according to the invention, the purity of input data and zero missing detection of deformation are ensured.

The invention provides a large-scale rotary equipment blade measurement system calibration method based on LM algorithm optimization, and belongs to the technical field of blade three-dimensional measurement. Points in a world coordinate system are converted to a rotary table coordinate system, are rotated in the rotary table coordinate system, and then are converted to the world coordinate system; and projecting the rotated world coordinate to a pixel coordinate system to obtain a theoretical pixel coordinate, comparing the theoretical pixel coordinate with an actual pixel coordinate, and calculating a re-projection error. Constructing a target function by using the re-projection error, and iteratively optimizing the axis parameters of the rotary table through an L-M algorithm until convergence; and outputting the optimized rotary table axis for blade point cloud splicing. According to the method, the problem of linear axis calculation errors on the basis of mark point position tracking is solved, nonlinear optimization of the rotary table rotating shaft is achieved, and technical support is provided for follow-up rotary splicing and all-topography measurement of blade point clouds.

The invention discloses a compact stripe monocular three-dimensional measurement system and method based on a mechanical grating, and belongs to the technical field of measurement sensing. The invention aims to solve the problems that the existing three-dimensional measurement technology depends on expensive active devices, the structure is complex, and single-frame high-density fringe projection and dynamic measurement are difficult to realize. The system comprises a dense fringe projection device, a monocular acquisition module and a processing unit. The compact stripe projection device is composed of an active light source, a mechanical grating and an optical lens, and is used for projecting a single-frame compact stripe formed by the mechanical grating to the surface of an object to be measured. And the monocular acquisition module is used for acquiring a deformed stripe image which is subjected to height modulation by the surface of an object. And the processing unit is used for synchronously controlling projection and acquisition and resolving the acquired single-frame deformed stripe image based on a pre-established system calibration model so as to reconstruct a three-dimensional point cloud coordinate of the object. The passive mechanical grating is adopted to replace traditional digital projection elements such as DLP, MEMS and DOE, and monocular vision and a single-frame reconstruction algorithm are combined, so that the system has the advantages of low cost, small size, single camera and the like, and has wide application prospects in the fields of miniaturized 3D imaging modules, extremely small endoscopes, portable 3D imaging equipment, dynamic 3D imaging and the like.

A 3D measurement system, a laser scanner and a measurement device are provided. The system includes a 3D measurement device and a 360 degree image acquisition system coupled in a fixed relationship to the 3D measurement device. The 360 degree image acquisition system includes a first photosensitive array operably coupled to a first lens, the first lens having a first optical axis in a first direction, the first lens being configured to provide a first field of view greater than 180 degrees. The image acquisition system further includes a second photosensitive array operably coupled to a second lens, the second lens having a second optical axis in a second direction, the second direction is opposite the first direction, the second lens being configured to provide a second field of view greater than 180 degrees. Wherein the first field of view at least partially overlaps with the second field of view.

The invention relates to a structured light three-dimensional measurement technology, and provides a system joint calibration optimization method fusing three-dimensional offset modeling and phase identity constraint for an industrial field low-precision target scene. The method comprises the following core steps: introducing a three-dimensional offset for a target feature point, and compensating spatial deformation and eliminating scale ambiguity through zero-mean constraint; sub-pixel matching is realized based on a phase identity principle, and projection constraint is enhanced to reduce dependence on a target; and constructing a joint reprojection error function, and adjusting and synchronously optimizing system parameters and offset by means of a bundle method. The prior art depends on a high-precision plane target, and when the target has manufacturing errors, installation warping or pasting deformation, calibration errors can be transmitted through an imaging link, so that the measurement precision is reduced, and target deformation and geometric errors of a projector are difficult to compensate at the same time. The method breaks through the limitation of a traditional inverse camera model, does not need to depend on a high-precision glass target, reduces the hardware cost, and constructs a cooperative compensation mechanism of a target manufacturing error and an imaging parameter. Experiments show that after explicit compensation is carried out on the local deformation of the target by adopting the three-dimensional offset factor, the flatness error gt is detected; on a paper target of 10 microns, the re-projection error of the camera is reduced by 79.6%, and the re-projection error of the projector is reduced by 74.8%; sub-pixel matching is achieved through phase identity constraint, multi-parameter collaborative optimization of bundle adjustment is combined, the high-precision measurement requirement of an industrial site is met, and an efficient solution is provided for high-precision three-dimensional measurement.

The invention provides a binocular stereoscopic vision system and structured light 3D scanner composite calibration method, and the method employs a digital coding point and checkerboard composite calibration technology. Only four digital coding points and a common checkerboard are needed to realize conversion matrix solution from a coding point coordinate system constructed by the digital coding points to a structured light 3D scanner measurement coordinate system, and high-precision dynamic calibration of a binocular vision system and a structured light scanner is realized. The problem of adaptability of a traditional calibration method in a complex industrial environment is solved, the calibration precision and stability of a composite measurement system are remarkably improved, meanwhile, the calibration method has the advantages of being simple in calibration process, low in system cost and the like, the calibration precision and stability are improved, a brand new technical solution is provided for three-dimensional measurement of an industrial site, and the method is worthy of popularization and application. The method is suitable for a dynamic measurement scene in a complex industrial environment.

The invention discloses a fringe projection measurement method for a high dynamic range scene. The fringe projection measurement method can realize high-precision three-dimensional reconstruction of a complex reflection scene without human intervention. The method comprises the following steps: firstly, projecting pure gray-scale maps with different gray scales to calculate the maximum unsaturated exposure time of a camera for a scene, constructing a phase error model for a fringe pattern captured under exposure, and respectively calculating the optimal exposure time of each pixel point under phase error and light intensity constraint conditions; and then, obtaining required exposure times, masks and exposure time by using an iterative optimization algorithm of the masks. And finally, obtaining an optimal fringe pattern for three-dimensional reconstruction by automatically capturing and fusing fringe patterns at different exposure times. Compared with a traditional high-dynamic measurement method, the method has the advantages that high-quality multi-exposure fusion can be completed without human intervention, and high-precision and high-robustness three-dimensional measurement of a high-dynamic-range scene is realized.

The present invention relates to a method for processing three-dimensional measurement data from a scanning probe microscopy system to provide three-dimensional topographic image data, as well as a method for performing scanning probe microscopy, a scanning probe microscopy system, a computer-implemented method, and a computer program product. The method comprises receiving 3D measurement data acquired by the SPM system into a processing device, the 3D measurement data typically mapping the topography of a structure provided by the substrate. The method further comprises digitally constructing model image data using shape contour data of the shape, and a regression operation to fit the model image data to the 3D measurement data. This results in a composite model image of the 3D measurement data that can be used as a topographic image.

To make 3D measurement efficient.SOLUTION: A site information management system comprising a computer including an arithmetic device configured to execute a predetermined process and a storage device connected to the arithmetic device, wherein the arithmetic device includes a site data storage unit configured to store site data including a movement record in which a position and a time at which a worker or work equipment moves in a site are associated with each other, a change location extraction unit configured to determine whether or not there is a time-series change in a site structure from the site data stored in the site data storage unit, and a recommendation unit configured to output information on the estimated change, the recommendation unit sets the determined changed portion as a 3D to be acquired, and outputs information on the region.SELECTED DRAWING: Figure 1

Systems and methods to generate synthetic images for use in a machine learning training set. The process begins with accessing a database of real-world 3-D images of equipment in a power grid, the 3-D images of equipment include 3-D measurements to create a dimensionally accurate and photorealistic model of the equipment. Optionally, the 3-D images could be aged or weathered using imaging editing software. Next, a database of real-world photographs of scenes in which the equipment is installed is accessed. Optionally, the identical scenes can be captured at different times of day, different times of the year, and at different perspectives. Next, using image editing software, the 3-D images of equipment is inserted into at least one of the scenes to form a synthetic image based on a combination of the equipment and the scene in which each of the equipment and the scene were previously captured independently of each other.

This invention provides a method for testing the accuracy of a total station, comprising: S1, setting up the total station to be tested at a first preset station; obtaining the first coordinates of each measurement point using the total station at the first preset station; S2, selecting two reference points and setting up transfer targets M1 and M2 respectively, obtaining the first coordinates of each transfer target using the total station at the first preset station; S3, moving the total station to a second preset station, and after selecting 2-point movement in the 3D measurement software, obtaining the second coordinates of each transfer target; if the station movement error does not exceed the required value, proceeding to the next step; S4, obtaining the second coordinates of each measurement point using the total station at the second preset station; comparing the second coordinates of each measurement point with the first coordinates of the corresponding measurement point; if the deviation value exceeds the preset value, the accuracy of the total station is unqualified; if the deviation value does not exceed the preset value, the accuracy of the total station is qualified; the testing process is simple and convenient, with a short cycle, and is easy to promote.

The invention relates to a time-of-flight based 3D surveillance system with flexible surveillance zone defining functionality. The invention relates to a surveillance system that detects and / or characterizes movements within or around a monitored infrastructure, such as a building or facility that is monitored to detect intruders. An improved trade-off between rigorous area surveillance and the number of false alarms is provided by improved control of the 3D surveillance device. Input functionality is provided to a user to define a 3D sub-zone within a 3D environment model. A change functionality allows the user to generate a redefined sub-zone by dragging one of the corner points of the 3D sub-zone to a different location within the 3D visualization of the 3D environment model, whereby the shape of the 3D sub-zone is deformed. The input and change functionality serve to provide spatial parameters associated with the redefined sub-zone to the 3D surveillance device and to cause the 3D surveillance device to generate an action in case a movement within the redefined sub-zone is detected by means of 3D measurement data.

A system and method for guiding at least one autonomous vehicle within an area, the system comprising: 3D-measuring means configured to detect the at least one autonomous vehicle and at least one object within the area, identifying means configured to obtain an identity of the at least one autonomous vehicle, aggregating means configured to aggregate information of the position and movement of the at least one autonomous vehicle, processing means configured to generate a set of instructions for the at least one autonomous vehicle, based on a total driving efficiency for said at least one autonomous vehicle and at least one additional vehicle and transmitting means configured to transmit the set of instructions for guiding the at least one autonomous vehicle.

[Problem] To make it possible to easily confirm, on a three-dimensional scanner, information relating to the measurement results of the three-dimensional scanner. [Solution] A three-dimensional measurement device is provided with a three-dimensional scanner (2), a position and orientation specifying means for specifying the position and orientation of the three-dimensional scanner (2), and a three-dimensional data generating means for generating three-dimensional data from the three-dimensional scanner (2). And a three-dimensional data generation means for generating display data indicating the three-dimensional shape of the object to be measured on the basis of the image including the pattern light and the position and orientation of the three-dimensional scanner (2), and transmitting the generated display data. A three-dimensional scanner (2) receives display data from a three-dimensional data generation mechanism. A scanner display unit (113) displays a display screen generated on the basis of display data received by a three-dimensional scanner.

The invention provides a spatial light modulation method and system for Gray code coding rearrangement, and relates to the technical field of computational imaging and spatial light modulation. According to the method, a Gray code sequence and a high-performance basic modulation matrix are combined, a basic modulation matrix is constructed according to a target image resolution ratio and a sampling rate, a Gray code index sequence with only one different adjacent indexes is generated, a measurement matrix is obtained by rearranging the matrix through a mapping function, and the measurement matrix is loaded to a spatial light modulator to code a light signal; and the double-path detector collects transmitted and reflected light intensity response and performs differential processing, and inputs a compressed sensing reconstruction algorithm to restore an image. According to the invention, stable and efficient information capture at a low sampling rate is realized, the anti-interference capability and repeatability of the system are improved, the hardware compatibility is strong, the implementation cost is low, and the method is suitable for the fields of single-pixel imaging, three-dimensional measurement and the like.

The application discloses a method for judging abnormality of flip-chip interconnection of an infrared focal plane device, and comprises the following steps: selecting a same layer lay out layer as a reference surface on four corners of a readout circuit, and the reference surface is close to an antireflection film of an infrared detector focal plane; performing 3D measurement on the four corners of the infrared detector focal plane, and the measurement area needs to contain the antireflection film of the infrared detector focal plane and the same layer lay out layer found on the readout circuit; performing height measurement on the measurement area, and measuring the height from the antireflection film to the readout circuit; calculating the height difference of the four corners, and then judging whether the flip-chip interconnection is abnormal or not. The application can quickly and effectively judge whether the abnormality of the interconnection is caused by the flip-chip interconnection abnormality, and will not cause any damage to the infrared focal plane.

This invention discloses a digital holographic 3D reconstruction system and method based on a single-cavity dual-optical comb, belonging to the field of digital holographic 3D measurement technology. The invention includes: a single-cavity dual-optical comb, a coarse wavelength division multiplexer, a first fiber amplifier, a second fiber amplifier, a first fiber filter, a second fiber filter, a first fiber beam expander, a concave mirror, a second fiber beam expander, a beam splitter, an image sensor, and a computer. The single-cavity dual-optical comb emits two pulses, which are split, amplified, and filtered. The measurement light and the reference light produce interference fringes, forming a hologram. This invention uses a single-cavity dual-optical comb as a light source to achieve the separation of the zero-order image, twin image, and target re-phenomenon in coaxial holography, improving the quality of holographic imaging and facilitating engineering implementation. Based on multi-wavelength heterodyne technology, combined with the wide spectral bandwidth and high temporal coherence of the optical comb, this invention suppresses the influence of noise, enabling the measurement of large-size objects and expanding the application scenarios of digital holography.

This application relates to a virtual binocular speckle stereo matching method based on local gray-level plane binary segmentation. It pertains to the fields of computer vision, 3D measurement, and stereo vision, and includes the following steps: S1: image loading and parameter settings; S2: local gray-level plane binary segmentation; S3: disparity calculation and sub-pixel optimization based on Hamming distance; S4: disparity map post-processing; sub-pixel interpolation is performed based on the matching cost curve to obtain disparity values ​​with sub-pixel accuracy, resulting in an initial sub-pixel disparity map; S5: depth map calculation and effective value filtering: the initial sub-pixel disparity map is filtered, consistency checked, and outlier removed to obtain an optimized dense disparity map; finally, combined with the calibration parameters of the virtual binocular system, the dense disparity map is converted into a depth map, and the result is visualized. This method has the advantages of high robustness, high accuracy and efficiency, and strong versatility.

This invention provides a real-time adaptive 3D measurement system and method for objects based on microstructured light. The system includes: multiple optical measurement units arranged in an equidistant circular array along the circumference on a ring mounting frame and moving synchronously with a lifting and adjusting mechanism; multiple measurement posture acquisition units, a reference posture monitoring unit, a posture compensation unit, a control unit, a data fusion module, and a quality analysis module. According to this invention, the multiple optical measurement units arranged in a circular array enable multi-view synchronous measurement of the workpiece, avoiding the time consumption and reference conversion errors of traditional indexing measurement methods. The real-time posture monitoring and dynamic compensation mechanism effectively suppresses measurement errors caused by factors such as mechanical vibration and temperature drift, reducing posture-related measurement errors. The system achieves automation, real-time measurement, and high precision in 3D measurement, improving measurement efficiency and accuracy.

To improve the performance of component recognition by a three-dimensional measuring device.SOLUTION: A three-dimensional measuring device comprises: a projection device for irradiating, with pattern light, a component having a body part and a plurality of electrode parts; an imaging device for imaging the component irradiated with pattern light; and a processing device including a processor for processing the image data of the component imaged by the imaging device. The processing device generates, from the image data, first grayscale image data indicating the shape of the component by shades, converts the first grayscale image data into three-dimensional point cloud data of the component, removes noise from the three-dimensional point cloud data to extract the electrode parts, converts the noise-removed three-dimensional point cloud data into second grayscale image data, and calculates the reference position of the component on the basis of the respective coordinates of the plurality of electrodes in the second grayscale image data.SELECTED DRAWING: Figure 16

The invention provides a Gamma lens and an industrial camera comprising the Gamma lens, the Gamma lens is an optical imaging system, and the Gamma lens sequentially comprises a first lens to a ninth lens with specific diopters and surface types and a diaphragm from an object side to an image side along an optical axis; by optimizing lens configuration, material matching and optical parameters, the problems of small target surface, easy thermal defocus, small inclination angle, small numerical aperture and the like in the prior art are effectively solved; the lens has the advantages of a large imaging target surface (the diameter of an imaging ring is 22 mm), good athermalization performance (the working temperature range is-20 DEG C to + 60 DEG C), a large object plane inclination angle (larger than 50 degrees), a large numerical aperture (NA = 0.12), a specific working wave band (395-415 nm) and the like, and the imaging quality, the environmental adaptability and the measurement precision in the fields of machine vision, 3D measurement and the like are remarkably improved; the invention also discloses an industrial camera comprising the Sammer lens.

Methods and systems are described that generate three-dimensional (3D) measurements from points in two-dimensional (2D) images. An example method includes determining an alignment between a 2D image of a dental site and a 3D surface of the dental site, determining a first point and a second point in the 2D image, projecting the first point and the second point onto the 3D surface based on the alignment between the 2D image and the 3D surface, performing a measurement of a distance between the projected first point and the projected second point on the 3D surface, and displaying at least one of a) a first visualization of the measurement on the 2D image or b) a second visualization of the measurement on the 3D surface.

Provided is an autonomous construction system of a precast prestressed concrete structure that enables efficient construction.　An autonomous construction system of a precast prestressed concrete structure according to the present invention comprises: a member management means that manages each of a plurality of precast prestressed concrete members by associating image-based individual identification information with each of the plurality of precast prestressed concrete members, and autonomously simulates an arrangement position between members to be joined for each construction process; a 3D survey means that acquires, for each construction process, 3D survey data of the precast prestressed concrete members disposed in a structure under construction; and a construction information management means that is communicably connected to the member management means and the 3D survey means. On the basis of the result of an alignment simulation of the precast prestressed concrete members disposed in the finished portion of the structure executed by the member management means, data specifying the position and the posture of the member that minimizes a deviation from the design data is output to a predetermined external device in association with the image-based individual identification information.

The application belongs to the technical field of three-dimensional measurement and digital reconstruction, and specifically discloses a pipeline reconstruction and detection method based on a virtual adapter, which comprises the following steps: a multi-view vision system collects multi-angle images of a pipeline to be detected, reconstructs the pipeline and determines a bending point; the pipeline is aligned and matched with the bending point, and an initial conversion matrix of a measurement and digital model coordinate system is obtained based on an SVD decomposition method; a digital model pipeline accessory is projected to a camera image, and an adjustment matrix is obtained by optimization of minimum pixel sum and maximum gradient; a threshold is set to screen edge points, and a final conversion matrix is obtained by optimization of maximum gradient after projection; the accessory is converted to the measurement coordinate system, and is spliced with the reconstructed pipeline to form a complete model, and the bending point and the accessory feature deviation are compared. The application reconstructs the pipeline with complex accessories such as flanges and valves through initial calibration of coordinate conversion, projection optimization and edge point fine adjustment, restores the pipeline and the accessory features completely, and improves the pipeline detection precision.

The invention discloses a rotary 3D profile measurement system, and belongs to the technical field of three-dimensional profile measurement. Comprising a machine body, a 3D measuring unit is installed on the inner side of the machine body, the 3D measuring unit comprises a laser displacement sensor, a rotation driving mechanism, a control module and a data processing module, and the laser displacement sensor is used for measuring contour information of a measured object in the X direction and the Z direction; the rotary driving mechanism comprises a rotary motor fixed on the inner side of the machine body; an angle encoder is mounted at the rotating end of the rotating motor; the rotating end of the rotating motor is fixed to the center of the rotating platform. The laser displacement sensor is fixedly arranged at the bottom of the rotating platform; the control module is connected with the rotation driving mechanism and the laser displacement sensor. The rotary 3D contour measurement system is simple, the scanning range is adjustable, the diameter of a detection circle changes along with the measurement distance, the measurement requirements of different height ranges are met, and multiple welding seam features are detected at the same time through one-time measurement.