1 Matlab 之小波滤波函数 南京理工大学仪器科学与技术专业 谭彩铭 2010-3-20 1 wfilters 函数 [Lo_D,Hi_D,Lo_R,Hi_R] = wfilters('wname') computes four filters associated with the orthogonal or biorthogonal wavelet named in the string 'wname'. The four output filters are Lo_D, the decomposition low-pass filter Hi_D, the decomposition high-pass filter Lo_R, the reconstruction low-pass filter Hi_R, the reconstruction high-pass filter 2 biorfilt 函数 The biorfilt command returns either four or eight filters associated with biorthogonal wavelets. 3 orthfilt 函数 [Lo_D,Hi_D,Lo_R,Hi_R] = orthfilt(W) computes the four filters associated with the scaling filter W corresponding to a wavelet 4 biorwaef 函数 [RF,DF] = biorwavf(W) returns two scaling filters associated with the biorthogonal wavelet specified by the string W. 5 coifwavf 函数 F = coifwavf(W) returns the scaling filter associated with the Coiflet wavelet specified by the string W where W = 'coifN'. Possible values for N are 1, 2, 3, 4, or 5 6 dbaux函数 W = dbaux(N,SUMW) is the order N Daubechies scaling filter such that sum(W) = SUMW. Possible values for N are 1, 2, 3, ... W = dbaux(N) is equivalent to W = dbaux(N,1) W = dbaux(N,0) is equivalent to W = dbaux(N,1) 7 dbwavf 函数 F = dbwavf(W) returns the scaling filter associated with Daubechies wavelet specified by the string W where W = 'dbN'. Possible values for N are 1, 2, 3, ..., 45. 8 mexihat 函数 [PSI,X] = mexihat(LB,UB,N) returns values of the Mexican hat wavelet on an N point regular grid, X, in the interval [LB,UB]. Output arguments are the wavelet function PSI computed on the grid X. This wavelet has [-5 5] as effective support. 2 This function is proportional to the second derivative functio...
