U !?h@s*ddlmZmZmZddlZdddZdS))grid_coordinatessparse_conv_matrixweights_to_laplacianNcCs<|jdd\}}d|d}t||t||f}t|S)arThis 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 Nr)shapernpZonesr)imageZradiusheightwidthZ window_sizeWr W/var/www/html/venv/lib/python3.8/site-packages/pymatting/laplacian/uniform_laplacian.pyuniform_laplacian s r)r)Zpymatting.util.utilrrrnumpyrrr r r rs