Patent ID: 6885980

Claim:
A signal-processing method for filtering a measurement data of a predetermined dimension, comprising: a measurement data input step for inputting the measurement data along a measurement path; a selecting step for selecting a weighted spline filter formula in accordance with the type of the measurement data; an initializing step for applying weight on the measurement data by a unit matrix to obtain an initial value of a spline filter output; a weight-adjusting step for adjusting and determining the weight on the measurement data; a spline filter output calculating step for calculating the spline filter output using the weight determined in the weight-adjusting step; a convergence test step for determining a convergence of the weight; and an output step for outputting a signal-processing result based on the spline filter output, wherein, when the weight is not judged converged in the convergence test step, the weight is updated and the weight-adjusting step and the spline filter output calculating step are repeated to conduct a robust spline filtering on the measurement data.