Algorithm 1: Pseudo-code for CT lung scans preprocessing.

Input: Input image I(n,m)

Output: Output image K(n,m)

begin

Adjust image intensity values

Convert the image into a binary image(B)

For all I pixels:

IF the grayscale value < the image Mean,

THEN, the pixel value = 0

ELSE the pixel grayscale value = 255

End IF

End For

Remove small objects from binary image, and Fill image regions and holes

Produce the output image(K)

For each Input image I do

For i = 1 to n do

For j = 1 to m do

Multiply each element in I(i,j) by the corresponding element

in B(i,j) and return the output image(K)

End For

End For

End For