wave_transform.py 文件源码

def fft_convolve(X,Y, inv = 0):

    XF = np.fft.rfft2(X)
    YF = np.fft.rfft2(Y)
#    YF0 = np.copy(YF)
#    YF.imag = 0
#    XF.imag = 0
    if inv == 1:
 #       plt.imshow(np.real(YF)); plt.colorbar(); plt.show()
        YF = np.conj(YF)

    SF = XF*YF

    S = np.fft.irfft2(SF)
    n1,n2 = np.shape(S)

    S = np.roll(S,-n1/2+1,axis = 0)
    S = np.roll(S,-n2/2+1,axis = 1)

    return np.real(S)