A collection of functions is presented which includes 2nd generation wavelet decomposition and reconstruction tools for images as well as functions for the computation of moment invariants. The wavelet schemes rely on the lifting scheme of Sweldens.

用于寻找信号峰值位置，返回信号峰值所在位置。-etect Peaks and Depressions in a signal returns peaks and depressions (local maxima and minimum) in the input signal.