Algorithm 1 Single Input-Sequential Processing

Read input image I(x, y) Compute the histogram h(i), i = 0, …., 255 for I(x, y) for t = 1: 255 do Compute ${\mu }_1$(t) using filtering approach ∈ technique (i) (see Figure 3). Compute ${\mu }_2$(t) using filtering approach ∈ technique (j) (see Figure 3) Compute the objective function n(t) in Equation (4). Find the optimal t* which minimize n(t). End for. return t* Output image g(x, y).

❖For other mean filters approaches: Compute ${\mu }_1$(t) and ${\mu }_2$(t) according to their equations (see Table 2)