Sequential updating of projective and affine structure from motion No signing in or signing up free sex chat sites in phoenix arizona where women want to hook up with men
With regard to the projective approach, I argue that its trade-off of simplicity versus accuracy/robustness needs more careful experimental examination, and I advocate more research on the effects of calibration error on Euclidean reconstruction.I point out the relative lack of research on adapting Euclidean approaches to deal with incomplete knowledge of the calibration.We propose a factorizationbased algorithm estimating simultaneously the aligning transformations and corrected points, exactly matching the estimated transformations, such that the reprojection error over all cameras is minimized.In the case of incomplete image data our algorithm uses an Expectation Maximization (EM) based scheme that alternates prediction of the missing data and estimation of the affine transformation.One of the key building blocks of these hierarchical approaches is the alignment of two partial 3D models, which requires to express them in the same 3D coordinate frame by computing a 3D transformation.This problem has been well-studied for the cases of 3D models obtained with calibrated or uncalibrated pinhole cameras.More generally, I propose that SFM is a messy problem and that it could require a flexible “intermediate-level” system incorporating a variety of different algorithms and sophisticated decision rules for combining them.
I review current approaches to structure from motion (SFM) and suggest a framework for designing new algorithms.
I also propose that fusing may be one of the best reconstruction strategies in situations where few-image algorithms give reasonable results, and suggest that an experimental understanding of the properties of few-image algorithms is important for designing good fusing methods.
I emphasize the advantages of an approach based on fusing image-pair reconstructions.
Based on tracked or matched features the relations between multiple views are computed.
From this both the structure of the scene and the motion of the camera are retrieved.