Figure 3.

The classification results were corrected by K nearest neighbor (KNN). Each of these categories is represented by a different color. The radius is set as the starting point $A$, and a circle is drawn, as shown in Process 1. The categories within the statistical circle have the most dots in red. Therefore, the category $A$ stays the same. In Process 2, it is found that the circle centered on $B$ has more red dots; therefore, $B$ is updated to red. In Process 3, $C$ is updated to redpoint in the same manner. When each point is updated, points in the same plane are updated to the same class, as shown in Process n.