A physically-based motion retargeting filter
ACM Transactions on Graphics (TOG)
Hand Motion Prediction for Distributed Virtual Environments
IEEE Transactions on Visualization and Computer Graphics
Dynamic estimation of linear systems constrained by bounds
IEEE Transactions on Signal Processing
Set-membership fuzzy filtering for nonlinear discrete-time systems
IEEE Transactions on Systems, Man, and Cybernetics, Part B: Cybernetics
Impact of Landmark Parametrization on Monocular EKF-SLAM with Points and Lines
International Journal of Computer Vision
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This paper presents the Smoothly Constrained Kalman Filter (SCKF) for nonlinear constraints. A constraint is any relation that exists between the state variables. Constraints can be treated as perfect observations. But, linearization errors can prevent the estimate from converging to the true value. Therefore, the SCKF iteratively applies nonlinear constraints as nearly perfect observations, or, equivalently, weakened constraints. Integration of new measurements is interlaced with these iterations, which reduces linearization errors and, hence, improves convergence compared to other iterative methods. The weakening is achieved by artificially increasing the variance of the nonlinear constraint. The paper explains how to choose the weakening values, and when to start and stop the iterative application of the constraint.