Transient noise can be removed by utilizing a nonlinear filter such as a median filter or a power limiter [4 7, 9].
Next, we augmented the Kalman filter by adding a nonlinear filter.
The model was built by adding a nonlinear filter for speed decoding to the Kalman filter while the direction information was directly inferred by the Kalman filter.
While we use the standard Kalman filter for hand direction estimation, due to the nonlinear characteristics of hand speed profiles, we simply augment the Kalman filter by adding a nonlinear filter for hand speed estimation.
The Condensation algorithm estimates the object state by calculating the conditional probability density (P(X_t | Z_t)) using a nonlinear filter.
So in [15] a nonlinear filter, called unscented filter, without this drawback was introduced.
The bilateral filter [42] is a nonlinear filter performing spatial averaging.
The identification of a nonlinear model and the design of a nonlinear filter are thus avoided.
Besides the fly data, we tested two forms of BPP, one with a linear filter function and one with a nonlinear filter.
Note that a linear filter and a nonlinear filter may have the same purpose.
