3 results about "Digital photogrammetry" patented technology

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 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.