Mr. Keith A. Redmill Profile

Keith A. Redmill

at Ohio State Univ

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Proceedings Article | 30 April 2009 Paper

Aerial image registration incorporating GPS/IMU data

Keith Redmill, John Martin, Umit Ozguner

Proceedings Volume 7347, 73470H (2009) https://doi.org/10.1117/12.820201

KEYWORDS: Cameras, Image registration, Georeferencing, Head, Distortion, Data modeling, Sensors, Error analysis, Databases, Image resolution

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We describe a methodology for multiframe image registration of airborne high resolution, multi-camera imagery. In the absence of predetermined camera and lens models, parameters are optimally determined from imagery and known ground reference locations. GPS and IMU data collected from the sensor platform and the identified camera model parameters are used to perform an initial orthorectification and georeferencing of each image. Multiple KLT, Sift, or featureless point-match correspondences are identified and validated using RANSAC techniques. Affine transform hypothesis are then generated, inconsistent hypothesis are removed using a RANSAC approach, and a final optimal transform is generated as the least squares optimal fit of the remaining correspondences. To eliminate long-term drift, key frames are selected and cross-registered. Performance improvements can also be demonstrated using a mask to eliminate correspondences not on the ground plane. This approach is illustrated using the 2007 AFRL Columbus Large Image Format dataset.

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