[Retracted] Efficient COVID-19 CT Scan Image Segmentation by Automatic Clustering Algorithm

Algorithm 1

Whale optimization algorithm (WOA) [14].

(1)	Input: initialize randomly generated Population (Pi) in search space, i:  = 1, 2, …, n
(2)	Output: (global position of best whale)
(3)	while (iteration < MaxIteration) do
(4)	Compute the fitness of each whale and position of prey ()
(5)	for each whale do
(6)	Update ℓ, p, ,
(7)	check ()
(8)	if |A| < 1
(9)	Update the whale’s positions using encircling phase
(10)	else if |A| ≥ 1
(11)	Compute () and update the whale’s position under exploration phase
(12)	end if
(13)	otherwise ()
(14)	update the whale’s positions under spiral phase
(15)	end step 8
(16)	end step 5
(17)	Limit the boundary of whales
(18)	compute fitness of each whale and prey ()
(19)	next iteration
(20)	end step 3
(21)	Return the optimized solution