Algorithm 4 CLAHE

Input: Image after gamma correction I;

1.  Resizing l to N × N; Decompose l—(n) tiles; (n)—N × N/n × n

2.  Hm—histogram(m); // histogram of a n × n tile;

3.  Clip limit: CL—Ncl × Navg of Hn using CL;

4.  pixels—distribution over the remaining pixels;

5.  CLAHE(n)—equalization of contrast limited the histogram tile histogram for the image(l)

6.  bc—bilinear interpolation of CLAHE

Output: CLAHE processed image bc