Automatic Processes in Photogrammetry

Abstract

Digital Photogrammetric Workstations (DPWs) and especially some software packages serving the processing of UAV images offer automatic algorithms to accelerate the gaining of end products like digital terrain or surface models or orthophotos. To achieve the final steps in the image evaluation, the orientation process, particularly the exterior orientation requires manual measurements of control points. The measurements of tie points necessary for building models from stereo image pairs or finding tie points for strips of images needed for aerial triangulation require automatic image matching. These algorithms are based mainly on finding the same terrain points, lines or other objects on different images using the area-based image matching, semi- global image matching or other object-based image matching techniques. The paper summarizes the recent status and the perspectives of these image processing solutions.