orthfilt - orthorgonal filter groups obtaining
This function obtains the filter groups representing the fast wavelet cascade algorithm of Lowpass decompostion filter, Hipass decomposition filter, Lowpass reconstruction filter and Hipass reconstruction filter. Please note only daubechies and some particular wavelets allow this kind of function. Others may use other function rather than orthfilt.
-->lo_r=wave('db2'); -->[Lo_D,Hi_D,Lo_R,Hi_R]=orthfilt(lo_r); -->Lo_D Lo_D = ! - 0.1294095 0.2241439 0.8365163 0.4829629 ! -->Hi_D Hi_D = ! 0.4829629 - 0.8365163 0.2241439 0.1294095 ! -->Lo_R Lo_R = ! 0.4829629 0.8365163 0.2241439 - 0.1294095 ! -->Hi_R Hi_R = ! 0.1294095 0.2241439 - 0.8365163 0.4829629 ! -->[Lo_D,Hi_D,Lo_R,Hi_R]=orthfilt(3); Input should be long enough! -->[Lo_D,Hi_D,Lo_R,Hi_R]=orthfilt(rand(2,2)); Input should be vectors rather than matrixes!