A Hybrid Unsupervised Approach for Retinal Vessel Segmentation

Algorithm 1

MISODATA algorithm.

1 ;

2 Step 1: compute the mean intensity of image from histogram;

3 set ;

4 ;

5 iteration, let ;

6 ;

7 ;

8 ;

9 M mean intensity of utilizing histogram;

10 Step 2: fordo

11   Compute MAT mean above threshold using from step 1;

12   Compute MBT mean below threshold using from step 1;

13   ;

14   ;

15   ;

16   ;

17   ;

18   ;

19   ifthen

20     go to Step 2;

21   else

22     ;

23   end

24 Step 3: divide the image into square local regions as follows:

25   ;

26   0;

27   ; for

     do

28     fordo

29       ;

30       ;

31       ifthen

32         ;

33       else ifthen

34         ;

35       else

36         ;

37       end

38       

39     end

40   end

41 end