lddmm_pytorch.py 文件源码

def arclength_param(line) :
    "Arclength parametrisation of a piecewise affine curve."
    vel = line[1:, :] - line[:-1, :]
    vel = np.sqrt(np.sum( vel ** 2, 1 ))
    return np.hstack( ( [0], np.cumsum( vel, 0 ) ) )