Automatic Extraction of 3D Models From an Airborne Video Sequence; Technical rept

摘要

One method for accurately georegistering a video sequence from an airborne platform is to transform the video to the same coordinate system as some reference imagery that is already georeferenced. This transformation will be dependent upon the 3D structure within the scene, which is not known a priori. The current report examines several aspects of the construction of a 3D model from a video sequence, which may then be used for registration. The topics examined include: extraction of useful features (points, lines, or planes) from the images, determination of a sparse 3D model and camera motion model in cases where data may be missing, a method for estimating the depth at every pixel within a video frame, and finally an analysis of the errors at each step of the model construction process.