o :ήcãã@s*ddlmZmZmZddlZddd„ZdS)é)Úgrid_coordinatesÚsparse_conv_matrixÚweights_to_laplacianNécCs<|jdd…\}}d|d}t||t ||f¡ƒ}t|ƒS)atThis function returns a Laplacian matrix with all weights equal to one. Parameters ------------ image: numpy.ndarray Image with shape :math:`h\times w \times 3` radius: int Radius of local window size, defaults to 1, i.e. only adjacent pixels are considered. The size of the local window is given as :math:`(2 r + 1)^2`, where :math:`r` denotes the radius. A larger radius might lead to violated color line constraints, but also favors further propagation of information within the image. Returns ------- L: scipy.sparse.spmatrix Matting Laplacian Nér)ÚshaperÚnpÚonesr)ÚimageÚradiusÚheightÚwidthÚ window_sizeÚW©rúL/tmp/pip-target-vg8gfxp4/lib/python/pymatting/laplacian/uniform_laplacian.pyÚuniform_laplacian s r)r)Úpymatting.util.utilrrrÚnumpyrrrrrrÚs