VideoTools.py 文件源码

def getTimeDerivative(I, Win):
    dw = np.floor(Win/2)
    t = np.arange(-dw, dw+1)
    sigma = 0.4*dw
    xgaussf = t*np.exp(-t**2  / (2*sigma**2))
    #Normalize by L1 norm to control for length of window
    xgaussf = xgaussf/np.sum(np.abs(xgaussf))
    xgaussf = xgaussf[:, None]
    IRet = scipy.signal.convolve2d(I, xgaussf, 'valid')
    validIdx = np.arange(dw, I.shape[0]-dw, dtype='int64')
    return [IRet, validIdx]


#############################################################
####            FAST TIME DELAY EMBEDDING, Tau = 1      #####
#############################################################
#Input: I: P x N Video with frames along the columns
#W: Windows
#Ouput: Mu: P x W video with mean frames along the columns