Lung Cancer Detection Using Image Segmentation by means of Various Evolutionary Algorithms

Algorithm 1

Median filter.

(1)	Assume the input matrix “A” which has M rows and N columns.
(2)	Construct a matrix with M + 2 rows and N + 2 columns by appending zeros to sides of the input matrix
(3)	Take a mask of size 3 × 3.
(4)	Place the mask on the first element, i.e., element on the first row and first column of matrix “A”.
(5)	Select all the elements listed by the mask and sort them in ascending order.
(6)	Take the median value (center element) from the sorted array and replace the element A(1, 1) by the median value
(7)	Slide the mask to the next element.
(8)	Repeat the steps from 4 to 7 until all the elements of matrix “A” are replaced by their corresponding median value.