flow_homography.py 文件源码

def homography2flow(x,y,H):
    """ Convert homography to flow field

    """
    pt1_ = np.c_[x.ravel(),y.ravel()].astype('float32')
    uv = cv2.perspectiveTransform(pt1_[:,np.newaxis,:],H).squeeze() - pt1_

    return uv[:,0].reshape(x.shape), uv[:,1].reshape(x.shape)