For many applications in photogrammetry precise target localization is essential. Target localization by image processing is composed of several steps, from target detection to fine centering at the end of the process. The following paper describes a model for fine centering of a target based on Least Squares Image Matching (LSM). Since the image of a target has been convoluted by the image sensor LSM has to be extended by an appropriate mathematical model. Its derivation, together with practical results for fiducial marks (circles and crosses) and targets that are circular in object space, are presented.
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