Enclosed Laplacian Operator of Nonlinear Anisotropic Diffusion to Preserve Singularities and Delete Isolated Points in Image Smoothing

Figure 1

The second-order enclosed difference of 𝑢(𝑖,𝑗).

(a) The first-scale second-order enclosed difference of 𝑢(𝑖,𝑗)

(b) The second-scale second-order enclosed difference of 𝑢(𝑖,𝑗)