Full-motion video georegistration for accuracy improvement, accuracy assessment, and robustness
Charles Ray Taylor, Reuben Settergren · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2012
Emerging standards for video metadata provide the means, in principle, for accurate geopositioning from full motion video. Georegistration to reference data as part of the workflow adds value by improving the metadata accuracy, establishing a check against mismodeling in the metadata and the corresponding a priori error covariance, and providing a mechanism to recover usable geopositioning capability in the event of failure of the system generating or transmitting the metadata. Georegistration may be done on board the collecting platform, at a ground station, or at any point in the exploitation process. A system capable of full motion video georegistration to reference data will be described, which establishes a photogrammetrically rigorous sensor model for each video frame. The sensor model operating parameters and error covariance are updated based on matches between pairs of frames and between frames and reference data. The challenge of finding associations between the reference data and the video images taken under very different imaging conditions is met by using both direct and feature matching approaches. Methodology for the validation of georegistration will be presented. Test results will be given for an operational real-time video georegistration system.