Worked example — computing the convergence threshold T.

The slide’s 10-pixel table shows which pixels changed class between iterations:

Pixel	Prev class	Current class	Changed?
1	1	1	0
2	2	2	0
3	3	3	0
4	4	4	0
5	4	3	1
6	3	4	1
7	2	1	1
8	2	2	0
9	3	3	0
10	4	4	0

• Changed: 3 pixels. Unchanged: 7 pixels.
• T (unchanged %) = unchanged ÷ total = 7 / 10 = 70%.
• If the operator set T = 95%, 70% is not yet high enough → ISODATA runs another iteration.