Editing

**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.

Cancel