2 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.