7 results about "Digital photogrammetry" patented technology

The invention relates to the technical field of model construction, and discloses a rapid three-dimensional model construction method and system based on remote sensing data, and the system comprises an acquisition module which is configured to obtain optimized RPC parameters; the model construction module is configured to construct a digital photogrammetry stereoscopic model based on the optimized RPC parameters and perform homonymy point matching; the identification module is configured to perform DEM sleeving precision inspection and determine a topographic change area in the to-be-monitored area based on an inspection result; the editing and modifying module is configured to perform repair and test updating on the DEM of the topographic change area according to a first precision standard to obtain repair and test updated DEM data; and the result detection module is configured to perform inspection and acceptance on the repair, test and update DEM data and the optimized DSM data, and if the inspection result is qualified, the repair, test and update DEM data and the optimized DSM data are output as final three-dimensional model construction results. According to the method, the efficiency and the precision of three-dimensional model construction are remarkably improved.

The invention discloses a digital photogrammetry method, electronic equipment and a system, relates to the technical field of electronics, and can reduce the operation complexity during image acquisition, expand the applicable scene of digital photogrammetry and increase the reliability of measurement. The method comprises the following steps: shooting a first image and a second image at different shooting positions in different shooting directions, both the first image and the second image comprise a target object and a first object with a known actual size; constructing a digital three-dimensional space according to the first image and the second image; the distance between the two end points of the target object is determined according to the digital three-dimensional space and the scaling of the size of the digital three-dimensional space and the size of the real three-dimensional space, and the scaling is related to the position of the first object in the first image, the position of the first object in the second image and the actual size of the first object.

The present invention discloses a method, system, medium, and device for segmenting subscenes in long-strip drone images, relating to the field of digital photogrammetry. The method mainly comprises: constructing a scene graph using connection point constraints between images, simplifying it, and eliminating gross errors; analyzing the camera parameters of a single image to optimize the gradient direction by combining neighboring images that have a connection relationship with the current image; setting connection edge weights based on similarity metrics between image nodes, and achieving robust subscene segmentation using a normalized graph cut method. Implementing the method, system, medium, and device for segmenting subscenes in long-strip drone images provided by the present invention can improve the robustness of subscene segmentation in long-strip drone images and help improve the accuracy of subscene reconstruction.

This invention discloses a road distortion correction method based on interactive DEM editing and local orthorectification updating, relating to the fields of remote sensing image processing, digital photogrammetry, and surveying and mapping production technology. The method includes: importing the original image, initial DOM, DEM, and positioning parameters; identifying road distortion areas in the DOM and expanding them to form a local update window and edge transition zone; constructing a road target elevation surface based on surrounding stable sample points and smooth continuity constraints; locally correcting the DEM based on this elevation surface and using a gradient transition within the edge transition zone; performing orthorectification and resampling only on pixels within the local update window based on the corrected DEM; and finally generating an update mask based on the edge transition zone and writing the local orthorectification results back to the initial DOM. This invention restores the correct spatial correspondence between the road and surrounding features from the three-dimensional geometric source by modifying the DEM rather than pasting the image, balancing geometric accuracy, edge continuity, and production efficiency without recalculating the entire scene image.

The utility model provides a measuring equipment protection device and three-dimensional digital photogrammetry equipment. The measuring equipment protection device comprises an inner shell, an outer thermal insulation layer and a PLC (Programmable Logic Controller), the outer heat preservation layer wraps the outer surface of the inner shell to play a heat preservation role, the inner shell is a double-layer cylindrical metal tank arranged in the outer heat preservation layer, and the double-layer cylindrical metal tank is provided with an inner cavity and an outer cavity which are isolated from each other. Circulating dry compressed air and cooling liquid are introduced into the inner cavity and the outer cavity respectively, through a dynamic temperature control system of a PLC, accurate control over the temperature in the tank body is achieved, it is ensured that the working environment temperature of a camera is appropriate, efficient protection is provided for three-dimensional digital photogrammetry equipment under the extreme temperature condition, and the service life of the three-dimensional digital photogrammetry equipment is prolonged. And the normal working capability of the equipment in a severe environment is ensured.

The application discloses a road distortion correction method based on DEM interactive editing and local orthographic updating, and relates to the technical field of remote sensing image processing, digital photogrammetry and surveying and mapping production. The method comprises the following steps: importing original images, an initial DOM, a DEM and positioning parameters; identifying a road distortion area in the DOM, and expanding the road distortion area to form a local updating window and an edge transition zone; constructing a road target elevation surface based on surrounding stable sample points and smooth continuity constraints; locally correcting the DEM based on the elevation surface, and connecting the DEM in the edge transition zone in a gradual manner; performing orthographic inverse solution calculation and resampling on only the pixels in the local updating window based on the corrected DEM; and finally generating an updating mask according to the edge transition zone, and writing the local orthographic result back to the initial DOM. The application restores the correct spatial correspondence between the road and surrounding objects from the three-dimensional geometric source by correcting the DEM instead of pasting images, and takes into account the geometric accuracy, edge continuity and production efficiency without recalculation of the whole scene image.

The invention belongs to the technical field of digital photogrammetry, and discloses a monocular distance and angle measurement method for a space cooperative target, which comprises the following steps of: filtering and binarizing a grey-scale map of a current frame image, and positioning an area where the target is positioned; positioning the convex hulls in the area where the target is located to position the target key endpoints, and obtaining two-dimensional pixel coordinates of the target key endpoints under the pixel coordinate system; in a world coordinate system, determining three-dimensional space coordinates of key end points of each target by using geometric dimension information of a known cooperative target, and modeling a corresponding relation of the key end points of each target in the world coordinate system and a pixel coordinate system by using a monocular camera imaging model so as to solve a distance and an included angle from a target centroid to a camera optical center; and when the target is in the extreme posture, correcting the distance by using the proportional relation between the pixel length of the target rotation axis and the actual physical length of the target rotation axis, and correcting the included angle. According to the invention, high-precision distance and angle measurement of the space cooperative target with changeable attitudes can be realized.