HPM-Based Dynamic Sparse Grid Approach for Perona-Malik Equation

Figure 2

Comparison between different numerical methods for image denoising (time step 𝜏=0.00001, terminal time 𝑡=0.00005).

(a) Original image

(b) Autocorrelation function of Daubechies scaling function

(c) Shannon scaling function

(d) Finite difference method