Ant Colony Optimization Approaches to Clustering of Lung Nodules from CT Images

Algorithm 1

Otsu algorithm.

Input: Lung CT image.

Output: Edge detected image using Otsu algorithm.

begin

 for each pixel of image

 find weight of pixel for both foreground and background

 find mean of weights for both foreground and background

 find variance of the pixels

 end for

 calculate within-class variance for all the pixels

 maximum value of within-class variance gives the edge pixels.

end