tfg.image.matting.build_matrices

Generates the closed form matting Laplacian.

tfg.image.matting.build_matrices(
    image: type_alias.TensorLike,
    size: int = 3,
    eps: type_alias.Float = 1e-05,
    name: str = 'matting_build_matrices'
) -> Tuple[tf.Tensor, tf.Tensor]

Generates the closed form matting Laplacian as proposed by Levin et al. in "A Closed Form Solution to Natural Image Matting". This function also return the pseudo-inverse matrix allowing to retrieve the matting linear coefficient.

Args
`image`	A tensor of shape `[B, H, W, C]`.
`size`	An `int` representing the size of the patches used to enforce smoothness.
`eps`	A small number of type `float` to regularize the problem.
`name`	A name for this op. Defaults to "matting_build_matrices".

Returns
A tensor of shape `[B, H - pad, W - pad, size^2, size^2]` containing the matting Laplacian matrices. A tensor of shape `[B, H - pad, W - pad, C + 1, size^2]` containing the pseudo-inverse matrices which can be used to retrieve the matting linear coefficients. The padding `pad` is equal to `size - 1`.

Raises
`ValueError`	If `image` is not of rank 4.

tfg.image.matting.build_matrices

Args

Returns

Raises