309results about How to "Achieve reconstruction" patented technology

An X-ray imaging system is for irradiating a subject with X ray from an X-ray source at a plurality of different angles to acquire X-ray images, and reconstructing an X-ray tomographic image from the X-ray images. The system comprising a region setting unit for setting a region of interest on a pre-shot image or a previously acquired X-ray tomographic image, an imaging control unit for continuously varying an aperture formed by collimator blades according to a position of the X-ray source to image the region of interest and acquiring projection data of the X-ray images in accordance with the position of the X-ray source, and an image reconstructing unit for reconstructing the X-ray tomographic image from the projection data of the X-ray images of the region of interest. The aperture formed by the collimator blades are varied so that all the X-ray images formed on the X-ray detector is rectangular regardless of the position of the X-ray source.

The invention discloses a three-dimensional point cloud reconstruction device and a three-dimensional point cloud reconstruction method based on a multi-fusion sensor. The device comprises a multi-fusion sensor module, a system data processing module and a three-dimensional point cloud reconstruction module. The method comprises the following steps: acquiring point cloud data and a video image byusing a multi-fusion sensor device, and processing the video image to obtain a target image including target posture, position and texture information; acquiring target point cloud corresponding to the original point cloud according to the acquired posture position information in the original point cloud and the target image; filtering the point clouds to remove messy point clouds; wherein the point cloud coarse registration comprises key point quality analysis; point cloud fine registration; and inputting the registered point cloud into a point cloud reconstruction unit to realize three-dimensional point cloud fusion and reconstruction. According to the method, the feature points corresponding to the target image reconstruction point cloud corresponding to the original three-dimensional point cloud are extracted to obtain the target three-dimensional space position information, texture and color information. Therefore, the point cloud registration precision is improved, and the falseidentification and tracking loss probability is effectively reduced.

The present invention provides a real-time three-dimensional scene reconstruction method for a UAV (unmanned aerial vehicle) based on the EG-SLAM. The method is characterized in that: visual information is acquired by using an unmanned aerial camera to reconstruct a large-scale three-dimensional scene with texture details. Compared with multiple existing methods, by using the method provided by the present invention, images are collected to directly run on the CPU, and positioning and reconstructing a three-dimensional map can be quickly implemented in real time; rather than using the conventional PNP method to solve the pose of the UAV, the EG-SLAM method of the present invention is used to solve the pose of the UAV, namely, the feature point matching relationship between two frames is used to directly solve the pose, so that the requirement for the repetition rate of the collected images is reduced; and in addition, the large amount of obtained environmental information can make theUAV to have a more sophisticated and meticulous perception of the environment structure, texture rendering is performed on the large-scale three-dimensional point cloud map generated in real time, reconstruction of a large-scale three-dimensional map is realized, and a more intuitive and realistic three-dimensional scene is obtained.

The invention discloses a panorama image stabilization method based on the iteration of global characteristic points. The method of the invention includes two parts of the estimation of image motion parameters based on the iteration of characteristic points and the compensation of image motion based on the wave filtering. The estimation of global motion parameters includes that a Harries characteristic point which is the most stable in the image is combined with a characteristic window; local characteristic points are gradually deleted through the identification of the distance consistency and the updating of the iteration of characteristic points so that the global characteristic point set converges rapidly and the global motion parameters can be accurately obtained. The compensation of the motion image includes that the global motion parameters are filtered to acquire dither parameters, and actual dither parameters are compensated and the normal scanning motion of an image pickup system is retained; simultaneously, the image fusion is combined with the compensation to realize the output of a panorama image. The method of the invention can effectively process the dithers such as translation, rotation and zooming, etc., of the image pick-up system and more complex local motion of the scene, and can be used for removing the influence on the video sequence by a motion carrier so as to output a stable video and improve the observation effect of the video monitoring or tracking.

The invention provides an instant positioning and map construction system and method with semantic perception, and the method comprises the steps that an image collection and preprocessing module obtains an RGB image collected by a camera, and carries out the preprocessing of the RGB image, and obtains a preprocessed image; a semantic segmentation module performs two-dimensional semantic segmentation on the preprocessed image to obtain a two-dimensional semantic segmentation image; the depth estimation module acquires depth information of the preprocessed image to obtain a depth prediction image of the preprocessed image; a camera pose estimation module performs camera pose estimation according to the input preprocessing image and the depth prediction image thereof to obtain a camera posematrix; and the three-dimensional dense point cloud reconstruction module carries out dense point cloud reconstruction of a three-dimensional scene on the current frame preprocessing image, the depthprediction image of the current frame preprocessing image and the current frame camera pose matrix, and maps the two-dimensional semantic segmentation image to dense point cloud of the three-dimensional scene to complete reconstruction of the three-dimensional scene with semantic information. The method has accuracy and robustness, and understanding and reconstruction of the scene are realized only by means of the monocular camera.

The invention discloses a bionic three-dimensional tissue engineering scaffold, which is formed by high molecular fibrous membrane-loaded active growth factors, or active growth factors loaded on a composite scaffold formed by a high molecular fibrous membrane and a macropore spongy layer. With the adoption of the bionic three-dimensional tissue engineering scaffold, the problem that the concentration of active molecules loaded with an emulsion electricity texture fibrous membrane is low; the emulsion electricity texture fibrous membrane is combined with a macropore spongy or a mixed electricity texture process, so that the load rate of the active factors can be greatly improved; parts of factors are retained in the fiber through an emulsion electricity texture core-shell structure, so that the effective control of releasing time is realized, and a repairing process is monitored for a long time; and the introduction of active molecules in the scaffold plays guiding and promoting functions for proliferating regenerative cells, directionally differentiating, migrating and adhering cells, and capturing stem cells to introduce regenerative functions of newly born tissues, so that a new path is provided for development of regenerative medicine industries.

The invention discloses a mirror movement neuromodulation system, which comprises a plurality of lead biological signal amplifiers, a microcomputer controller, a plurality of lead functional electric stimulators and a micro-current direct-current constant-current stimulator. The principle that functional electric stimulation and transcranial direct-current electric stimulation techniques and mirror movement neurons participate in movement control is applied comprehensively, the biological signal amplifiers, the functional electric stimulators for simulating integrated electromyography envelope signal control, and the micro-current direct-current constant-current stimulator are integrated through the microcomputer controller, myoelectric activity envelope signals are generated by processing myoelectric signals of a plurality of muscle groups which move functionally by using an uninjured side limb, and the plurality of functional electric stimulators are modulated and controlled, so that the same mirror action is generated by the plurality of muscle groups of an injured limb on an opposite side according to uninjured side myoelectric information, brain functional regulation and reconstruction are realized, the plasticity of neuronal synapsis and the recovery of neurological functions are facilitated, and the treatment effect of sports rehabilitation is achieved.

The invention relates to a tissue engineering bracket material capable of physically embedding active substances and a preparation method thereof. The tissue engineering bracket material capable of physically embedding the active substances is prepared from 100 weight parts of biodegradable macromolecular substance and 0 to 20 weight parts of active substances, wherein the weight part of the active substances is not equal to zero; 100 weight parts of biodegradable macromolecular substance consists of 50 to 100 weight parts of synthetic macromolecular substance and 0 to 50 weight parts of natural macromolecular substance; the macromolecular substances and the active substances form a micromolecular nanofiber membrane or a composite macromolecular nanofiber membrane; and the active substances are bonded on the surface of the fiber membrane uniformly. The tissue engineering bracket material capable of physically embedding the active substances has high biocompatibility and sufficient mechanical strength, can be biodegraded, is suitable for proliferation and directed differentiation of stem cells, and has the functions of promoting cell migration adhesion and capturing the stem cells so as to induce regeneration of tissues such as bones, cartilages, nerves, skin and the like.

The invention provides a fractal multi-resolution simplified method used for large-scale terrain rendering. The method comprises the following steps: (1) determining a terrain grid rendering region in a scene, firstly carrying out equidistant grid resampling on DEM (digital elevation model) data of coarser grids to form a terrain quadtree node; (2) projecting a view point to an XOZ plane, creating a terrain multi-resolution frame, and setting a plurality of different resolution levels from 1 to n on the terrain by adopting the multi-resolution LOD (level of detail) technology according to the view point; and (3) determining the level of the terrain according to the distances between the view point and different regions of a model, extracting characteristic parameters from an original DEM data set, adopting a DEM-based fractal random midpoint displacement interpolation to generate a continuous real terrain, and realizing reconstruction of a large-scale terrain. The terrain realized by adopting the method in the invention has good space continuity, cracks between different levels in a common multi-resolution model can be avoided, and smooth transition of different resolution models can be realized.

The invention provides a microscopy CT imaging device with three-free degree motion control and a correcting method thereof. The microscopy CT imaging device comprises an X-ray source (1) and an X-ray source detector (2), wherein a material-carrying table (3) is arranged between the X-ray source (1) and the X-ray source detector (2). The device is characterized in that the material-carrying table is externally provided with a driving device for driving the material-carrying table to move along the horizontal direction, the vertical direction and the rotation direction. The device solves the problems of serious shake, large error and low precision when the common microscopy CT mechanical device moves; leads the three-free degree direction motion to be more stable, the speed to be more even, and the precision degree to be higher; has better radiation shield effect; solves the problem of the heat dissipation of the X-ray source and the X-ray source detector; solves the problem that the X-ray source, the X-ray source detector and a material-rotating center are positioned at one line; and lays good foundations for the subsequent image acquisition and image reconstruction.

Endoscopic images and virtual endoscopic images are obtained. Then, an endoscopic image captured at a predetermined position of the anatomical structure is extracted from the obtained endoscopic images, and a comparative virtual endoscopic image virtually generated as if it is captured at a position corresponding to the predetermined position is extracted from the obtained virtual endoscopic images, and the extracted images are associated with each other. A three-dimensional position corresponding to each pixel forming the endoscopic image captured at the predetermined position is calculated based on a three-dimensional position of each pixel forming the comparative virtual endoscopic image. Then, volume data is generated from the endoscopic image captured at the predetermined position based on a pixel value of each pixel forming the endoscopic image and the three-dimensional position calculated for each pixel.

The present invention discloses a flexible wearable strain sensor based on fabrics and a preparation method thereof. Fabrics are taken as raw materials; carbonization fabrics capable of keeping the structure of original fabrics and having flexibility and electrical conductivity in the high-temperature heat treatment process in the atmosphere of taking inert atmosphere or inert gases as the principal thing; two ends of the carbonization fabrics are connected wires or integration wireless emission receiving module; and a flexible wearable strain sensor is obtained through package by using elastomeric polymers. The flexible wearable strain sensor based on fabrics are able to directly attach to the skin, the clothes or other wearable accessories to realize the wearable detection of human joint movement, pulse, microexpression, breath, sound production or audio frequency. The flexible wearable strain sensor based on fabrics and the technological process of production thereof are sustainable in development, simple in preparation, low in cost, good in flexibility, wide in strain detection range, high in sensitivity, short in response time, good in cycling stability and durability, and broad in application prospect.

The invention discloses a blade shape rapid scanning device and method. The device includes a base, an X main shaft, a Y main shaft, a Z main shaft, a turntable, a noncontact optical probe and a contact probe; the X, Y, Z main shafts and the turntable are arranged on the base; wherein the X, Y, Z main shafts are used to drive the probes to move freely in the space X, Y and Z; the turntable is used to drive a blade to rotate in the measuring space; the non-contact optical probe and the contact probe are commonly mounted on the Y main shaft through a connecting member; the non-contact optical probe is used to measure the blade surface with low precision, obtains all the point cloud data of the blade and plans the measuring path; and the contact probe is used for high-precision measurement of the blade surface along a well-planned measuring path.

The present invention is preparation process of complicated tissue organ precursor and belongs to the field of biological tissue engineering technology. Seed cell or gene and matrix material are prepared into micro colloid bead or 3D multi-canal structure; and cell and rack are located in space accurately via fast computer aided formation, coating, injecting, etc. The said process is superior to available tissue engineering process, which is time consuming and has uneven distribution of cells in rack, hard permeation of cell to deep structure and other demerits. By means of part combination, the present invention can reach the requirement of complicated organ, and realize organ reconstruction for repair and regeneration.

The invention relates to a method for reconstructing a large-scale complex flyover 3D model by using airborne LiDAR data. The method includes the following steps: using inverse iteration mathematic morphological filtering and area information to extract flyover point cloud from airborne LiDAR data; in accordance with bridge floor connectivity, segmenting the flyover cloud point; adopting a central line vertical line scanning method to segment and extract a communicated bridge surface which has no bifurcation or intersection structures and has a width consistent width, acquiring a "constitutional unit"; an end place of the constitutional unit central line serving as a circular buffer area, detecting a shielding structure of the flyover through determination of point cloud height information within the buffer area; through steps of constitutional unit matching, 2D central line fitting and 3D curved surface fitting, acquiring a complete bridge surface 3D central line; and reconstructing a flyover 3D model in combination with bridge surface width information. Practice has proved that the method of the invention can effectively reconstruct the large-scale complex flyover 3D model, addresses shielding problem of the flyover point cloud, and the reconstructed 3D model has a higher correctness and completeness.

The invention discloses a method, a device, and an apparatus for three-dimensional face reconstruction, and a compute readable storage medium. The method comprises: marking feature points of a face reference image in a face reference image set, performing global contour deformation on a reference model based on pixel coordinates of the feature points, and performing photometric normal reconstruction on a deformed primary face model by a photometric stereo technology based on a normal, based on a surface normal vector of the reconstructed target face model, using a mesh deforming technology toiterate to generate a target face model by the optimized normal. The invention provides a robust three-dimensional face reconstruction technology based on the photometric normal, with help of unrestrained image sets and reference models, and combined with the photometric stereo technology and a mesh deformation technology, restriction on face reference images is reduced, and advantages of the twotechnologies are used. The method prevents defects of using one technology alone to reconstruct faces, improves quality of three-dimensional face reconstruction, and realizes robust three-dimensionalface reconstruction with high accuracy.

The present invention discloses a three-dimensional imaging laser radar system based on high-speed electro-optic modulation technology. The system mainly comprises a main control circuit module, a laser lighting module, a laser emitting optical system, a laser receiving optical system, a high-speed electro-optic modulation module, an EMCCD imaging module, and a host computer. Under the control of the main control circuit module, the high-speed electro-optic modulation module modulates the echo signal detected by the laser receiving optical system, one path is modulated as an optical signal whose light intensity is monotonically increased with time, and the other path is modulated as an optical signal whose light intensity is monotonically decreased with time. The two modulated optical signals are collected by two paths of EMCCD cameras with photon detection ability at the same time and then are transmitted to the host computer. The host computer processes two images and reconstructs the three-dimensional image of a target scene. The system has the advantages of high imaging speed and high resolution and is especially suitable for the three-dimensional detection imaging of a high dynamic target.

The invention discloses a visual navigation and inertial navigation combination navigation method based on an aircraft. The method comprises the following steps: 1, establishing a two-dimensional planar rectangular picture coordinate system; 2, acquiring video image data and aircraft pose data, and preprocessing images; 3, continuously tracking a characteristic point; 4, establishing a three-dimensional flight-path coordinate system; 5, calculating the speed vector of the flight-path; 6, resolving the attitude of the aircraft; 7, fusing data, and calculating the flight-path angle; 8, carrying out coordinate transformation, and acquiring the displacement matrix of the aircraft; and 9,repeating step 3 to step 8 multiple times until the continuous acquisition of the displacement matrix set of the images is completed in order to achieve the continuous combination navigation. The movement flight-path speed vector of the aircraft is obtained through visual navigation, the inertial navigation data is fused, and the error of the visual navigation is compensated and corrected to reconstruct the flight-path of the aircraft, so the aircraft can stably and autonomously fly.

The invention discloses a low-dose X-ray CT image reconstruction method. The low-dose X-ray CT image reconstruction method sequentially comprises the steps that (1) imaging system parameters of CT equipment and projection data in low-dose CT scanning protocol are obtained, (2) the projection data variance on each data point is calculated according to the projection data obtained in the step (1) and the position of each data point and the number of all the data points are showed, (3) a projection data recovery model is established according to the projection data variances estimated in the step (2), (4) solving is carried out according to the projection data obtained in the step (1) by means of the projection data recovery model established in the step (3) to obtained recovered projection data, and (5) image reconstruction is carried out according to the recovered projection data obtained in the step (4) to obtain a reconstructed CT image. The low-dose X-ray CT image reconstruction method has the advantages that noise and artifact of the image can be greatly reduced, the resolution ratio of the original image can be well kept, and high-quality reconstruction of the CT image is finally achieved.

The invention discloses a cell-gel material composite microsphere as well as a preparation method and an application thereof and belongs to the field of biomedical materials. The cell-gel material composite microsphere is prepared from a gel microsphere and cells distributed in the gel microsphere. The preparation method comprises the following steps: dispersing a gel material-cell mixed solution in an oily solution, and carrying out emulsification and gelation treatment to obtain the cell-gel material composite microsphere. The cell-gel material composite microsphere is controllable in cell loading ratio, high in cell survival rate, small in volume shrinkage, difficult in breaking, good in transmitting capability of nutrients and metabolites, simple in preparation method and convenient in popularization and application and can also be used for preparing nonhomogeneous hydrogel so as to obtain a material with high biomimetic degree.

The invention discloses a positioning control method of a flexible mechanical arm based on vision. The method includes the following steps of obtaining information of a feature area on a robot mechanical arm, obtaining the positions and postures of a base, joint rotating centers and the tail end of a mechanical arm through coordinate system conversion, and controlling the movements of the flexiblemechanical arm. A positioning control device of the flexible mechanical arm based on vision comprises the robot base and the mechanical arm, and further comprises a first motor, a second motor and amicroprocessor, wherein the feature area is arranged on the mechanical arm. The feature area on the flexible arm is detected and positioned by means of the cameras, and therefore the positions of thejoint rotating centers in a camera coordinate system are obtained, and the reconstruction of the arm type of the flexible arm is realized; through the comparison with the positions of the tail end andall the joint rotating centers in theory, the movement bias of the mechanical arm is corrected, the movement precision of the flexible mechanical arm is improved, and the positioning control method and device are widely applied to the mechanical arm control field.

The invention relates to an artificial total knee replacing prosthesis which can reconstruct anterior cruciate ligament and comprises a tibia platform supporting part and a liner. The tibia platform supporting part consists of a horizontal platform and a rod part which are fixedly connected; the surface of the liner is provided with a pair of spherical concaves horizontally intervened so as to respectively receive a femur scleromere. The pad and the tibia platform supporting part are provided with a pore canal which respectively penetrates the pad and the horizontal platform of the tibia platform supporting part and are communicated with each other, so as to lead the anterior cruciate ligament to pass through the pore canals, the two ends of the ligament to be fixed on the tibias of a femur ectocondyle, and the horizontal platform of the tibia platform supporting part; thus realizing the reconstruction of the anterior cruciate ligament in a replacing surgery of the artificial total knee.

The invention discloses a method and device for reestablishing a user database on a block chain, terminal equipment and a storage medium. The method for reestablishing the user database on the block chain comprises the steps of reading all data items on the block chain, wherein each data item is obtained after being encrypted through a preset encryption algorithm; adopting a decryption algorithm corresponding to the encryption algorithm for decrypting each data item, and obtaining a decrypting result of each data item; if the decrypting results carry user identifiers, determining the data items as user data information corresponding to the user identifiers, and saving the data information; based on indexes and data secret keys, establishing a corresponding relationship of the data information on the block chain, and reestablishing the user database on the block chain. By means of the method for reestablishing the user database on the block chain, a user can find back missing data fromthe block chain, and the user database is reestablished.

The invention discloses a passive single pixel telescope imaging system, and belongs to an optical imaging field. The passive single pixel telescope imaging system comprises an imaging lens, a spatial light modulator, a light beam convergent lens and a data acquisition card, which are orderly arranged on a light path; the spatial light modulator is arranged at an imaging position of the imaging lens; the light beam convergent lens is located on a light path of an output beam of the spatial light modulator; the data acquisition card is provided with a photovoltaic conversion chip; the data acquisition card and the spatial light modulator are connected with a processor through a data line. The imaging system is simple in structure and low in environmental requirement; besides, the acquisition time can be effectively reduced and the recovery of target images under a low sampling rate can be realized. The invention further discloses a passive single pixel telescope imaging method. The imaging method is simple in recovery algorithm and fast in image reconstruction speed, and can shoot and reconstruct the images of large sizes, so that the imaging method has a higher application value in the macro fields like military, remote sensing satellite, astronomy and engineering detection, etc.

The invention provides a low latency Ethernet repeater and a low latency Ethernet forwarding method based on a T structure, which are used for solving the wiring redundancy problem in the existing switch and the problems that the time delay is larger and the time delay is uncertain in the existing forwarding method. The repeater comprises a port in T-type distribution and a processing unit; the processing unit comprises a left port frame processing module, a right port frame processing module, a user port frame processing module, an address learning and search module, a special protocol processing module and a user port adapter module. A forwarding method comprises the following steps: judging a link state; caching a data frame; identifying and classifying frames; reconstructing a link; classifying PAUSE frames; configuring the repeater; learning and searching an address; building an output queue; building the PAUSE frames; and outputting the PAUSE frames to the port. The low latency Ethernet repeater and the low latency Ethernet forwarding method based on the T structure provided by the invention can fully reduce the user access wiring redundancy, reduce the forwarding delay and guarantee the forwarding delay certainty, and can detect and reconstruct a network link timely during a network link failure, so that the low latency Ethernet repeater and the low latency Ethernet forwarding method can be used for building a high speed real-time access network.

The invention relates to a 3D reconstruction and measurement method for a spatial object via in-orbit hedgehopping imaging. The method comprises the steps of obtaining hedgehopping images via spatial hedgehopping shooting, carrying out multi-view 3D reconstruction aimed at the spatial object, and converting a 3D model of the spatial object into an absolute scale. Via the method, high-definition shooting and measurement can be carried out on a random spatial object rapidly in response to investigation requirement, and compared with ground investigation, strict observation weather condition and observation windows are not needed; and the object can be reconstructed and measured in a non-contact manner via groups of sequential images including the to-be-measured spatial object instead of providing camera parameters by a shooting platform, and the difficulty and cost of in-orbit measurement are reduced greatly.

The invention discloses a probe type online three-dimensional imaging detection system which comprises a crystal growth reactor, a three-dimensional imaging probe, a light source and a strobe controller, a computer for processing an image, and a display, wherein the three-dimensional imaging probe is used for transmitting a 2D image to the computer; the computer is used for firstly deleting a background by using a splitting technology and then identifying corresponding points and lines from the 2D image by using an angle / edge / line detection technology; for few angles / lines which are detected difficultly, indistinct angles / lines are predicted / estimated by using molecule modeling and a crystal shape model on the basis of the obtained angles and lines, 3D image reconstruction is realized by using the determined points and lines, then particle description characteristics of 3D crystals are obtained by combining with solution parameters measured online, and finally, the control and the amplification of a crystallization process in a reactor are realized by using a crystalline form grain number balancing model and computational fluid mechanics. The system and the method provided by the invention are capable of directly acquiring the image from the solution and realizing the reconstruction of the 3D crystalline form, and are high in image processing speed.

Embodiments of the invention provide a database cluster metadata management method and system. The method comprises the steps that a cluster initiation node receives a management request sent by a client and sends a locking request to a global lock management entity; the global lock management entity receives the locking request, judges whether a lock conflict exists or not and judges whether an available lock resource exists or not; when no lock conflict exists and the lock resource exists, a locking success response is sent to the cluster initiation node; the cluster initiation node receives the locking success response and sends a metadata management request to other nodes in a cluster; all nodes in the cluster manage metadata according to the request and sends a response success message to the cluster initiation node after the management is completed; and the cluster initiation node receives the response success message and sends an unlocking request to the global lock management entity. The problem of cluster metadata inconsistency caused by the fact that clients accessing to different cluster nodes initiate the same metadata management request at the same time in a high-concurrency scene is solved.