13 results about "Collinearity equation" patented technology

The invention discloses a cultivated land non-agrochemical monitoring method based on unmanned aerial vehicle video spatialization. The method comprises the following steps: acquiring a farmland area video stream, positioning and attitude determination system data and digital elevation model data acquired by an unmanned aerial vehicle; extracting a key frame from the video stream based on a double-threshold detection algorithm of the optical stream change rate and the image information entropy; performing spatialization processing on the key frame through a collinear equation optimization solution combined with a digital elevation model, and converting image coordinates into geographic coordinates; fusing the key frame image data with the corresponding geographical coordinate information, and constructing input data of a deep learning model of geographical perception; inputting the fused data into a geographic perception deep learning model to perform ground object interpretation, and extracting spatial features by the model through a built-in geographic coordinate embedding layer to identify a cultivated land non-agrochemical target; post-processing is carried out on the interpretation result, the post-processing comprises morphological closed operation processing and grid-to-vector conversion processing, quality control is carried out by calculating a re-projection error index and an intersection-to-parallel ratio index, and a cultivated land non-agrochemical monitoring report is generated.

The application discloses a kind of antenna profile rapid measurement system real-time calibration method, comprising: each laser tracker respectively to each control point is aimed at ranging, the distance value of each laser tracker center and each control point is obtained, create space sphere, obtain the accurate coordinate of each control point;Antenna profile rapid measurement system is photographed to the control point and the measured mark point of measured antenna imaging, the image point coordinate of control point and the image point coordinate of the measured mark point of measured antenna are obtained;Based on control point collinear condition equation and the preset measurement camera internal parameter, the position and posture of control point relative to control field coordinate system are obtained according to the image point coordinate of control point and the image point coordinate of the measured mark point of measured antenna;According to profile measurement point collinear equation and the position and posture of control point relative to control field coordinate system, the position and posture of the measured mark point of measured antenna are obtained.The application improves the measurement accuracy and reliability of antenna profile rapid measurement system.

The application provides a forest and grassland fire early identification and positioning method based on infrared thermal imaging and visible light fusion, and belongs to the technical field of forest and grassland resource protection and ecological safety monitoring. The method comprises the following steps: synchronously collecting infrared and visible light images and recording the space-time information of a monitoring platform; performing pixel-level registration on the two images; extracting a thermal anomaly suspected area from the infrared image based on a dynamic background temperature field, and extracting a smoke suspected area from the visible light image based on color, texture and motion features; performing spatial correlation analysis on the suspected areas extracted from the two channels, and combining the area growth rate and temperature rise rate of continuous multiple frames to construct a fire evolution model to confirm a fire point; calculating the three-dimensional geographic coordinates of the fire point based on the photogrammetry collinear equation and a digital elevation model; and generating and outputting alarm information containing the three-dimensional coordinates and fire intensity. The application realizes early and accurate identification and positioning of forest and grassland fires, and significantly reduces the false alarm rate.

The invention discloses a railway facility inspection method and system fusing GNSS positioning and image recognition, and relates to the technical field of rail traffic monitoring, and the method comprises the steps: employing a GNSS receiver to obtain a second pulse signal, triggering an inertial measurement unit, an encoder and a line-scan digital camera, and obtaining the real-time attitude data and image data of a track along the line; carrying out tight coupling calculation on the real-time attitude data, generating a mobile station track with centimeter-level precision, obtaining exterior orientation elements of image data shot by a linear array camera, mapping pixel coordinates of the image data to a geodetic coordinate system by adopting a collinear equation, calibrating latitude and longitude and mileage information for each abnormal target pixel, and obtaining fused image data; inputting the fused image data into the trained deep learning network for processing, and obtaining a recognition result; and comparing the identification result with preset geometric data, and if an abnormal condition is satisfied, obtaining a final identification result. The method can improve the confidence of the image recognition result.

The invention discloses a distributed vision measurement method and system applied to multiple large fishponds. The method comprises the following steps: arranging a measuring station near each fishpond to be measured, and obtaining a left photo and a right photo; constructing an optical distortion model of the camera lens, respectively calculating distortion values of the plurality of control points and the plurality of pointer points based on the optical distortion model, carrying out descending sorting on the distortion values, and screening a preset number of control points and pointer points with minimum distortion values; constructing a collinear equation, and resolving the collinear equation through the screened control points to obtain exterior orientation elements; and forward intersection calculation is carried out based on the interior orientation element and the exterior orientation element of the camera and the image point coordinate calculation of the to-be-detected key point of the to-be-detected fishpond to obtain the object space coordinate of the to-be-detected key point of the to-be-detected fishpond, and verification is carried out through the screened pointer point. According to the invention, approaching measurement of a plurality of large fishponds can be realized, high-precision measurement data can be obtained, and the measurement efficiency can be improved.

The application relates to a method and device for monitoring an ancient road and a garden ecological dynamic based on binocular camera shooting, and belongs to the technical field of photogrammetry and computer vision. The method comprises the following steps: collecting multi-focus section images of the ancient road and the surrounding ecology; inversely calculating camera internal parameters of the corresponding focus section, and performing zoom camera endless zoom distortion calibration; using a collinear equation of binocular images and three-dimensional coordinates of control points to solve camera external orientation elements; taking a reference frame as a reference, calculating a relative offset of a target region in a continuous frame through sub-pixel accuracy least square matching, converting the ground resolution into a real ground deformation variable, and dynamically monitoring ancient road and ancient tree deformation variables; extracting ecological elements through image segmentation, analyzing coverage and texture changes based on a time sequence, and monitoring garden ecological changes. The application realizes joint monitoring of ancient road structure deformation, ancient tree posture change and surrounding ecological state, and improves the intelligent and fine level of cultural site protection.

This application relates to a method, apparatus, terminal device, and storage medium for determining camera relative pose parameter values ​​based on binocular vision. The method includes: obtaining a first relation by taking the partial derivative of each matrix element in a first camera extrinsic parameter matrix according to the collinearity equation; obtaining a second relation by taking the partial derivative of each relative pose parameter according to the relative pose parameter matrix and determining its product with a preset second camera extrinsic parameter matrix; determining a partial derivative function relation for the collinearity equation with respect to the relative pose parameters based on the product of the first and second relational expressions; obtaining a pixel deviation relation between the true image coordinates and the collinearity equation based on the product of the increment of the relative pose parameters and the partial derivative function relation; iterating over the pixel deviation relation, and obtaining the relative pose parameter values ​​of the first camera when the iteration is complete. This method can reduce computational complexity and improve camera calibration efficiency.

The invention relates to a component deformation determination method and device, computer equipment and a storage medium. Comprising the steps of obtaining point cloud data of a part and image data, collected by at least two image collection devices, of the part; aiming at each piece of image data, performing parallax correction on the image data according to the point cloud data, the first collinearity equation and external parameters of image acquisition equipment for acquiring the image data to obtain a correction graph corresponding to the image data; performing pixel matching on the correction images corresponding to different image data to obtain a correction pixel coordinate group corresponding to each position point of the component; therefore, parallax correction of the image data acquired by different acquisition devices is realized, the actual three-dimensional coordinate of each position point is determined according to each correction pixel coordinate group, the determined actual three-dimensional coordinate is more accurate, and according to the difference value between the actual three-dimensional coordinate of each position point and the initial three-dimensional coordinate, the actual three-dimensional coordinate of each position point can be corrected according to the difference value between the actual three-dimensional coordinate of each position point and the initial three-dimensional coordinate. And the deformation occurrence condition of the component is determined, so that the determined deformation occurrence condition is more reliable.

The application discloses a kind of building group regularizing method and system, system includes vector determination module, equation determination module and coordinate solution module.First, vector determination module obtains the vector polygon corresponding to building group, and the direction vector of building group is determined by vector polygon.Then, equation determination module identifies collinear contour edge and non-collinear contour edge in building group by direction vector, and determines collinear equation according to various parameters corresponding to all collinear contour edge, and determines straight line equation according to each parameter corresponding to each non-collinear contour edge.Finally, coordinate solution module can solve the building group contour node coordinates after regularizing with collinear equation and straight line equation as control condition, obtain the building group polygon after regularizing, realize building group regularizing, retain the topological relationship characteristics of adjacent contour edge at the same time, and avoid the emergence of gap and overlap etc.

The application relates to the technical field of image matching, and discloses a UAV image tilt angle anomaly detection method based on image matching and geometric model analysis, which comprises the following steps: acquiring a UAV image to be detected and a reference orthographic image; generating two-dimensional ground control points through feature matching and forming three-dimensional control points by supplementing elevations by using a public digital elevation model; solving photographic exterior orientation elements through monocular space resection; applying a collinearity equation model based on the solved exterior orientation elements to perform light ray tracing from an image side to an object side on image four-corner points, iteratively intersecting with a digital elevation model to accurately invert three-dimensional geographic coordinates of the ground four-corner points; constructing a geographic footprint quadrilateral based on the positions of the corner points and calculating a length ratio of upper and lower edges as a tilt angle index; and comparing the ratio with a preset threshold to determine a tilt angle anomaly. The application does not need to rely on an airborne attitude sensor at all, can invert a UAV photographic attitude based on image content, and can accurately compensate projection differences caused by terrain height differences through a projection geometric model under terrain constraints, so that high-precision automatic detection of UAV image tilt angle anomalies under complex terrain conditions is realized.

The invention provides a method and a device for determining an aviation large-inclination-angle photographing route, which are applied to the technical field of aviation remote sensing. Comprising the following steps: converting the longitude and latitude of a target area into projection plane coordinates, constructing a bounding rectangle surrounding a target, and calculating an initial side-looking sweep angle by taking a long side as a flight direction and combining a minimum approaching distance, a flight height and a rectangle parameter; determining the coverage width of a measurement area according to the rectangular width and the lateral extension proportion, calculating the swing-scan field angle, the cycle index and the interval angle corresponding to the maximum cut-off swing-scan angle, determining the Y coordinate of a route according to the rectangular coordinate and the minimum approaching distance, and calculating the X coordinate of an exposure point to form a sequence in combination with the camera course breadth and the overlapping degree. And calculating the position attitude of the aerial photo based on the exposure point serial number, the sweep angle and the route direction, calculating the ground coordinates and elevation of four corners of the aerial photo through a collinear equation by combining camera parameters and a digital elevation model, and determining the coverage range.

The application relates to a progressive adjustment continuous pose estimation method for a lunar probe landing process, which comprises the following steps: step 1) selecting a landing camera sequence image from a rapid adjustment section to a hovering section, obtaining multiple connection point matching information through feature matching, and performing initial pose estimation by adopting a 'double model relative orientation-three image model connection'; step 2) performing pose parameter refinement on the initial pose information by using a sliding window type coplanar or collinear equation constraint, combining Schur complement edge linearization and weighted pseudo-observation constraint, and step 3) constructing an incremental collinear adjustment model of additional external control points to optimize the result of step 2), so as to reduce the pose estimation and positioning error. Compared with the prior art, the application has the advantages of effectively realizing high-precision and rapid calculation of continuous position and attitude parameters in the lunar probe landing process, and the incremental collinear adjustment model of additional external control points can further improve the pose estimation and positioning precision.

The application provides a kind of unmanned aerial vehicle image ortho rectification method and device for water surface, applied to unmanned aerial vehicle surveying and mapping technical field, above-mentioned method includes: obtaining unmanned aerial vehicle image that unmanned aerial vehicle is shot to water surface area;Based on the longitude and latitude of photographic center, coordinate system conversion is carried out, and the plane coordinates of photographic center in photogrammetry coordinate system are obtained;According to collinear equation, based on the plane coordinates of photographic center and unified water surface elevation value, the ground point coordinates of each pixel in unmanned aerial vehicle image in photogrammetry coordinate system are determined;And based on the ground point coordinates of each pixel, the point cloud data of unmanned aerial vehicle image is constructed;Based on the geodetic height of unmanned aerial vehicle image, unified water surface elevation value and equivalent focal length when unmanned aerial vehicle is shot, ground sampling distance is determined;Based on ground sampling distance, the point cloud data of unmanned aerial vehicle image is ortho rasterization processing, and the image after ortho rectification is obtained.Through the present application, the defect that over-reliance on ground feature points in related art is solved.