DL¶
- class menpo.base.DL[source]¶
Bases: object
Object that is able to take it’s own derivative wrt landmark changes.
- d_dl(points)[source]¶
The derivative of this spatial object wrt spatial changes in anchor landmark points or centres, evaluated at points.
Parameters: points : (n_points, n_dims) ndarray
The spatial points at which the derivative should be evaluated.
Returns: d_dl : (n_points, n_centres, n_dims) ndarray
The jacobian wrt landmark changes.
d_dl[i, k, m] is the scalar differential change that the any dimension of the i’th point experiences due to a first order change in the m’th dimension of the k’th landmark point.
Note that at present this assumes that the change in every dimension is equal.