104 results about "Digital photogrammetry" patented technology

The invention relates to a small unmanned aerial vehicle remote sensing-based slope deformation detection and calculation method which comprises the following technical steps: arranging and measuring image control points on the spot according to characteristics of a slope; acquiring a high-definition image of the slope on the spot by virtue of a small unmanned aerial vehicle remote sensing system; processing and adding the image control points to generate a three-dimensional slope point cloud by virtue of digital photogrammetry; performing checking and optimization to generate a three-dimensional slope point cloud with high absolute position accuracy; highly accurately registering three-dimensional slope point clouds of earlier and later periods; performing slope deformation detection and calculation on the basis of high-accuracy remote sensing results of an earlier period and a later period.

The invention relates to an emergency investigation method for a single geological disaster based on remote sensing of a small unmanned aerial vehicle. The technical steps include: customization of small UAV remote sensing system; indoor preparation; field operation; rapid processing; comprehensive processing. The purpose is to carry out fast and effective image control point layout and measurement based on slope characteristics, and at the same time use a small unmanned aerial vehicle remote sensing system to automatically collect photos of the slope, and generate the slope by introducing image control points in the process of digital photogrammetry. The high-precision and high-resolution remote sensing results are obtained, and then the slope deformation detection and calculation are carried out on the two-phase remote sensing results that have passed the precision inspection and high-precision registration, so as to obtain the overall deformation characteristics of the slope quickly, efficiently and accurately.

The invention relates to a landslide emergency treatment engineering exploration design method based on remote sensing assistance of a small unmanned aerial vehicle. The method is characterized by comprising the following steps: rapidly acquiring a high-definition picture of a landslide engineering region in field by using a small unmanned aerial vehicle remote sensing system; generating an orthophoto remote sensing result of the landslide engineering region through digital photogrammetry software processing; making a large-scale line global map by using the orthophoto remote sensing result; carrying out indoor visual auxiliary engineering geological investigation based on an orthophoto and a three-dimensional model; programming a visual conventional engineering geological map according to an on-site engineering geological investigation result; carrying out an auxiliary treatment engineering design based on the visual engineering geological map; programming a visual and conventional landslide emergency treatment engineering design plane map.

A camera measuring method of long-straight track geometric parameter belongs to digital camera measuring and digital image disposing technique of railway contribution. It is: fix cooperate symbol on circuit detecting vehicle head moving on long-straight track, install camera before the vehicle. When vehicle moving along the track, at least two images at different time of the symbol moving as track waving and deflecting are shoot. Achieve geometric parameter (at least one of gage, cant, longitudinal deviation and versed sine) of the track by image processing. The invention efficiently meets high-speed railway requirements of high precision, reliability and automatic degree detecting, greatly improves geometric parameter level of track, which can be applied directly in geometric parameter detecting system of tamping vehicle and be as a core to design multiform track detecting vehicles.

A method for rigorously reshaping a pair of overlapping digital images using a Digital Photogrammetric Workstation (DPW) is disclosed. The overlapping images are imported into the DPW as a pair of originally distorted images having an associated sensor model. The original images are triangulated to adjust sensor parameters. Orthophotos are created with a flat digital terrain matrix (DTM) to leave terrain displacements within themselves, and according to a sensor model and formula for exact projective computations. The orthophotos are aligned by rotation, and interior orientation coordinates of the equivalent vertical frame images are determined. The orthophotos are imported as a pair of overlapping equivalent vertical frame images according to the interior orientation coordinates. A digital terrain model is generated in the DPW using the overlapping equivalent vertical frame images. Another orthophoto is produced using the digital terrain model to remove the measured terrain displacements. In an alternative embodiment, the equivalent vertical frame images are aligned by using the classical pair-wise rectification method or by separately rotating each image without aligning the orthophotos by rotation during their creation. In each embodiment, the sensor model of the original distorted images is dissociated from the orthophotos for subsequently greater distribution and usage of the stereo imagery.

The invention discloses a nano-scale three-dimensional shape measurement method based on a scanning electron microscope. The scanning electron microscope currently widely used is organically combined with the digital photogrammetry in macrocosmic measurement, the characteristics that the scanning electron microscope is easy to operate and can be used to take two-dimensional pictures with high amplification factor and large depth of field are fully utilized, and the advantage that digital photogrammetry can be used to automatically and precisely reconstruct the complete three-dimensional data of the surface of an measured object from the pictures taken from multiple angles is fully exerted. A group of sample pictures is obtained by using the scanning electron microscope to take sample pictures from multiple angles at the same amplification factor, the distortion of the pictures are corrected, the corrected pictures are reconstructed by using the digital picture correlation algorithm, and the complete three-dimensional point cloud data of the sample surface is reconstructed on the basis of the corrected pictures and pre-calibrated system parameters, thus the dense point cloud data of three-dimensional shape in the local range of a sample is measured accurately at the nano scale, and the three-dimensional measurement of the shape of a nano-scale micro device is realized.

The invention relates to a calibrating method of a laser dot-matrix device of an obstacle avoidance system of a lunar rover, which can effectively solve the problems on precisely calibrating the relationship between 18 laser beams in the laser dot-matrix device and a reference prism coordinate system of the laser dot-matrix device and the relationship between reference prism coordinate systems of an obstacle avoidance camera. The method comprises the following steps of: taking a photograph of a laser dot by using the camera; processing the image to obtain an image point coordinate; carrying out triangular surveying based on internal parameters of the camera to obtain a three dimensional coordinate; obtaining the three dimensional coordinate of the laser dot under a double-camera photographic surveying system by using the processed photograph; establishing the relationship between marked points on the double cameras and a bracket and the coordinate system, the coordinate of the laser dot under a bracket marked point coordinate system and a theodolite coordinate system; establishing the relationship between the theodolite coordinate system and the bracket marking point coordinate system and the relationship between the theodolite coordinates and the reference prism coordinate system of the dot-matrix device; and then establishing the coordinates of the laser dot under the theodolite coordinate system and the reference prism coordinate system. The invention has the advantages of fast calibrating speed and high accuracy, and can be effectively used in the fields of technological digital photogrammetry, computer vision and the like.

The invention relates to a method and a device for digital remote sensing geology mapping, the technical problem to be solved by the invention is to provide a method for digital remote sensing geology mapping based on the techniques, such as digital photogrammetry, digital image processing, and static three-dimensional image establishment and engineering geology analysis, etc. The technical proposal to solve the problem is: A) the preference of shooting modes, one corresponding mode of three shooting modes which are a basic mode, an extended mode and a strip-map mode, is selected according to three site conditions which are a high and steep slope, foundation pit excavation and an underground cavern; B) the shooting of digital images; C) the establishment of a three-dimensional image model; D) the extraction of spatial attribute data; and E) the utilization of the spatial attribute data. The method and the device of the invention can be applied to the geology mapping (logging) of the high and steep (rock) slope, the foundation pit excavation and the underground cavern in various constructions, such as water conservancy, hydroelectric power, transportation and mines, etc.

The invention provides a method for measuring three-dimensional roughness of a rock mass structural surface based on a triangle area ratio method, and belongs to the field of the geotechnique in civil engineering. A digital photogrammetry system is utilized to acquire the structural surface, the three-dimensional space form of the whole structural surface is reflected according to the surface form of the exposed part of the structural surface, plane fitting is conducted on the structural surface through the least square method, the ratio of the total area of triangular meshes of the structural surface to the plane area is calculated and reflects the smooth degree of the fit structural surface. The advantage of a photogrammetry method that three-dimensional data of the structural surface can be quickly and accurately measured is fully utilized, the surface of the structural surface is reconstructed through a Delaunay triangulation method on the basis, and then the surface form of the structural surface is reflected through the three-dimensional triangular meshes. On the basis of reconstructing the surface of the structural surface in a three-dimensional mode, a specific area method is provided, and the magnitude of roughness is reflected according to the ratio of the area of the meshes of the structural surface to the fitting area.

The present invention relates to a method for integrating the survey and design of power transmission lines with internal and external work using all-digital photogrammetry technology. The present invention is improved on the basis of the prior art. Plane section data, after field measurement and adjustment, use the data batch processing software interface to input the plane section data into the Daoheng software platform. The invention has the beneficial effects of low cost, high work efficiency, reduced labor intensity, less personnel investment, reliable quality, easy popularization and application, and remarkable economic and social benefits.

The invention discloses a method for estimating biomass of wetland plants through aerial photographic remote sensing of an unmanned aerial vehicle. The method comprises the following steps: with the unmanned aerial vehicle as a remote sensing photography platform, continuously shooting images of the to-be-estimated wetland by the unmanned aerial vehicle, performing field collection on to-be-estimated wetland plant biomass samples, calculating the biomass, and processing the images of the to-be-estimated wetland by a digital photogrammetry technology to acquire the high-resolution-ratio groundnormal incidence image of the to-be-estimated wetland; establishing a ground surface plant community height change model image and a visible light vegetation index model image of the to-be-estimated wetland; according to the plant biomass of the sampling point, the ground surface plant community height value and the visible light vegetation index value, establishing a regression model of the plantbiomass, the plant community height and the visible light vegetation index (VDVI), and estimating the biomass of the wetland plants by the regression model. By the method provided by the invention, the biomass of the large-area wetland plants can be estimated rapidly, the working efficiency and the quality are greatly improved, the accuracy is relatively high and the cost is relatively low.

The invention discloses a method for generating an ortho-photo map of a narrow and long region of a border by a digital photogrammetry system. The method comprises the following steps of (1) preparingand analyzing data; (2) dynamically planning block adjustment; (3) extracting digital surface model data; (4) generating digital elevation model data; (5) performing quality inspection; (6) generating a digital orthoimage; and (7) evaluating the quality of a digital orthoimage product, and generating digital orthoimage product regulations with processes conforming to the national and industry standards. By adopting the method, the precision of the generated digital orthoimage can meet the precision requirements of level-3 products with the scales of 1:10,000 in the national standards minimally, a high-precision, efficient and high-universality digital orthoimage production process is realized, and an innovative technical method is provided for digital mapping work of the narrow and long region of the uncontrolled or less-controlled border.

The invention relates to an aerial photogrammetry simulation system. The aerial photogrammetry simulation system not only can make an aerial photogrammetry track device of itself adjust the positions of air strips at any time according to requirements, but also can be combined with a ground total-factor terrain and ground feature model and an aerial photogrammetry data processing center. Therefore, the aerial photogrammetry simulation system not only can meet requirements of teaching of the cartology and the photogrammetry, and further can meet requirements of teaching of the digital photogrammetry, the principle and method of remote sensing and a plurality of courses belonging to the surveying and mapping technology subject, but also can provide experimental facilities for the photogrammetry scientific research performed by teachers.

The invention discloses a combined measured target and a digital photogrammetry system which is capable of effectively alleviating an adverse effect on the accuracy of digital photogrammetry due to air disturbance and is combined with a laser tracking technology. The digital photogrammetry system adopts at least one laser tracking instrument which is respectively calibrated with relative positions with various digital photogrammetry instruments; a reflector tracked by the laser tracking instrument is fixed in a measured target dot array and establishes a determined relative position with at least one measured target in the measured target dot array; a target point marked by the measured target with the definite relative position with the reflector is a reference point of the digital photogrammetry of target points in the measured target dot array; and the coordinate values of the target points, which are obtained through the digital photogrammetry system, are all determined through the relative positions of the reference point and the laser tracking instrument. The combined measured target comprises a support body, a measured target and the reflector, wherein the measured target and the reflector are both arranged on the support body; and the determined relative location is established between the measured target and the reflector.

The invention discloses a close shot large span digital photogrammetry system and method. The system comprises a rectangular collecting platform, guide rails, cameras, a three-dimensional calibrating board and a two-dimensional control filed. The three-dimensional calibrating board comprises a plurality of calibrating marks distributed evenly, each calibrating mark comprises a cylindrical type wooden stick and a round wooden board on the top surface of each cylindrical type wooden stick, the cylindrical type wooden sticks of all the calibrating marks are different in height, and the cylindrical type wooden sticks of the calibrating marks located in the middle of the three-dimensional board are higher than those located on the peripheral of the calibrating marks. The two-dimensional control field comprises a plurality of control point marks distributed on the end face of the edge of the rectangular collecting platform, the control point marks form the control points of the two-dimensional control field, and each control point mark comprises a round wooden board. The close shot large span digital photogrammetry system and method can enable images to achieve the fidelity of high-precision geometrical information.

The invention relates to the technical field of digital photogrammetry and provides a vision measurement system structure parameter calibration and affine coordinate system construction method and system. The method comprises the following steps: S1) for the same image, carrying out bundle adjustment through front points and corresponding image points to obtain a rear intersection point coordinate; S2) obtaining a front principal point coordinate corresponding to an intersection point; S3) repeating the steps S1) and S2) for a plurality of different labeling images to obtain a plurality of point pairs; S4) carrying out tangent co-sphere secondary intersection adjustment by utilizing the intersection point and front projection corresponding points to obtain a vision measurement system structure parameter and pan-tilt rotation center coordinate; and S5) establishing an affine space coordinate system. Through a cospherical secondary intersection iteration calibration method, the method can accurately calibrate structure parameters of a vision measurement system ( that is, a cloud lens camera system and a hand-eye system), establish an accurate affine coordinate system, and realizes unlabelled accurate measurement of the vision measurement system.

The invention provides a profile digital photography automatic measuring method. The profile digital photography automatic measuring method comprises the following steps that the position and the posture of the profile to be measured are measured by utilizing a laser tracker (5); the shooting position, angle and quantity of a digital photography measurement camera (4) is planned by utilizing a digital photography measurement principle; the mutual relation among an omni-directional movable lifting platform (1), a mechanical arm (2) zero position, a digital photography measurement camera (4), alaser tracker (5) and attitude measurement equipment (3) are marked in a laser tracker (5) coordinate system; the movement of the omni-directional movable lifting platform (1) and the mechanical arm (2) is controlled, so that the digital photography measurement camera (4) moving to a planned shooting position and angle; the profile is photographed, so that the orientation and the flatness of the profile can be obtained through a data acquisition and analysis system (6) processing. According to the profile digital photography automatic measuring method, high precision, high efficiency and automatic measurement can be carried out on the profile degree and the pointing precision of the large-scale antenna profile, and the profile digital photography automatic measuring method particularly aims at a process requiring multiple times of repeatability measurement.

The invention relates to an image point matching method for industrial digital photogrammetry. In the method, distances from image points to be matched to corresponding epipolar planes are utilized as constraint conditions, and images are grouped according to known points. The method comprises the following steps of: firstly, sorting the images into a plurality of groups according to whether containing the same object points; then, combining and matching parts of each group of images with better calculated geometrical quality; and finally, reversely calculating same-name image points on other images by utilizing the object points. By using the method, the matching speed and the matching accuracy can be improved. Proved by tests, compared with an image point matching method based on epipolar constraint, the method has less computation and small error.

A large mesh antenna reflector profile high-precision test method is provided. By using high-precision industrial digital photogrammetry technology, a single camera is used for separately recording the images of the same scene in a space from different locations and directions. By means of image processing and according to known camera parameters, the three-dimensional coordinates of the scene relative to a coordinate system in the space are calculated. The profile precision of the mesh antenna is obtained by fitting the coordinate values with a theoretical profile. In order to improve the profile measurement precision of a large-caliber small-datum and high-precision large flexible mesh antenna reflector, by means of a designed reference conversion device, a high-precision long reference ruler, the large mesh antenna reflector profile is subjected to high-precision testing by optimal technological parameters of the photogrammetry system.

The invention discloses a close shot large span digital photogrammetry system. The close shot large span digital photogrammetry system comprises a support, a rectangular collecting platform, an X-axis guide rail, a Y-axis guide rail, a Z-axis guide rail, a three-axis motion controller, a first stepping motor, a second stepping motor, a third stepping motor, three stepping motor drivers and three cameras, wherein the three stepping motor drivers and the three cameras are in one-to-one correspondence with the three stepping motors. According to the close shot large span digital photogrammetry system, the upward movement of the cameras in a large range is achieved by using the coordination control of the numerical control system, the limitation of scanning span is overcome, scanning precision is also ensured, and the close shot large span digital photogrammetry system is made to be capable of achieving the fidelity of high-precision geometrical information by being matched with a standard control grid board.

The invention provides an oil painting 3D copying method adopting a UV ink-jet printer and a 3D printer. A digital photography measuring method is used for carrying out 3D modeling on the original painting of an oil painting, the 3D printing technology is utilized for copying printing, and the pigment thickness information of the original copy of the oil painting is copied precisely; and then color information is printed through the high-precision color printing technology of the UV ink-jet printer, high-precision copying of the three-dimensional information and color information of the oil painting is completed, and an oil painting stereo is obtained. By means of the oil painting 3D copying method, on the premise of guaranteeing that the manuscript of the oil painting is free of damage and free of physical contact, the oil painting is copied simply and fast, and the obtained stereo has higher fidelity and precision.

The invention discloses a linear dynamic calibration device, and belongs to the field of digital photogrammetry in geometric quantity measurement. The linear dynamic calibration device disclosed by the invention mainly consists of two parts: a mechanical structure and a calibration module. The mechanical mechanism is mainly composed of four parts: one is a base, the other is a linear motion guiderail, the third is an air floating sliding table component and the fourth is a linear motor and control system. The calibration module is mainly composed of two parts: one is a photographing target, and the other is a magnetic railing ruler and frequency meter. A linear motor is used as a driving unit, which is connected with an air floating sliding table for moving, the magnetic railing ruler isused as a feedback distance signal to realize a closed-loop control function, the photogrammetry target is installed on the air floating sliding table, the air floating sliding table together with thephotogrammetry target can perform uniform linear motion, a digital photogrammetry system measures the moving photographing target and compares a measurement result with a standard value to realize the calibration of the dynamic performance of the digital photogrammetry system. The linear dynamic calibration device disclosed by the invention has a measurement range of 0-3.6m and a maximum runningspeed of 5 m/s, and ensures a uniform motion distance of 1m at the maximum running speed.

The invention discloses an urban water map and a manufacturing and displaying method thereof. The urban water map is made and displayed on the basis of the GIS technology, the remote sensing technology, the BIM technology and the digital photogrammetry technology, and, in combinations with data information platform downloading, on-site survey of treading points, literature data and the like, real-time basic information is obtained. Data processing is performed on the real-time basic information by adopting land class analysis, pollution analysis, key node analysis and drainage basin analysis,then an urban water map base map and a primary urban water map are sequentially made, and map effect supplementation is performed on the primary urban water map to obtain a final urban water map. Thefinal-edition urban water map not only can effectively display the river position, but also can visualize attributes such as river pollution, river flow direction and river silting nodes. In addition,river channel, drainage basin, wetland liquidity, river pollution and possible pollution can be visually analyzed on a large scale, and on the basis, a river channel and drainage basin treatment scheme is discussed.

A 3D image reconstructing method using X-ray volume photography acquires a plurality of X-ray area array images of the object interested according to locating principle of the digital photographic measurement. A plurality of mark points of the known 3D positions are simultaneously taken in the X-ray photo, and the method uses the coordinates of the mark points in the rectangular coordinate system for volume photographic 3D image reconstruction and the coordinates of the mark points in the X-ray photo coordinate system to construct a transforming relationship of the two coordinate systems. The method determines the path and the position of each X beam by using the transforming relationship and gets all voxels of each X-ray passing the object interested. The method uses the voxel g and the pixel G of the same X beam path to get Radon set of equations to determine the gray scale value of voxel g, then determines the gray scale values of all voxels g by computer and reconstructs a 3D volume image of the object interested based on the gray scale value of voxel g.

The invention relates to a method for quickly and finely valuing slope rock mass joint orientation in open pit mines based on digital photogrammetry, which comprises the following steps: (1) contact measurement of field structural plane orientation; (2) fine measurement of structural plane digital photography; (3) data analysis and processing of the structural plane; (4) K means clustering and statistical analysis of the orientation of the structural plane. The method for quickly and finely valuing slope rock mass joint orientation in open pit mines based on digital photogrammetry in the invention adopts a digital photography measuring method to obtain the data of orientation of the structural plane, uses the K means clustering method to carry out grouping of the structural planes, determines a statistical distribution rule and a statistical feature value of orientation of each group of rock mass structural plane of the slope on the basis of statistical analysis of orientation of eachstructural plane and in combination with a field site measurement result and combines the field site investigation and indoor statistical analysis.