解读matlab之小波库函数,解读matlab之小波库函数

图14

wavedec函数中的核心函数为dwt函数，作多少尺度的分解就调用几次dwt函数。

4 waverec函数

waverec函数是多尺度一维离散小波重构函数。 waverec performs a multilevel one-dimensional wavelet reconstruction using either a specific wavelet ('wname', see wfilters) or specific reconstruction filters (Lo_R and Hi_R). waverec is the inverse function of wavedec in the sense that the abstract statement waverec(wavedec(X,N,'wname'),'wname') returns X.

X = waverec(C,L,'wname') reconstructs the signal X based on the multilevel wavelet decomposition structure [C,L] and wavelet 'wname'. (For information about the decomposition structure, see wavedec.) X = waverec(C,L,Lo_R,Hi_R) reconstructs the signal X as above, using the reconstruction filters you specify. Lo_R is the reconstruction low-pass filter and Hi_R is the reconstruction high-pass filter. Note that X = waverec(C,L,'wname') is equivalent to X = appcoef(