The number of nodes of the Kohonen network is determined after many trials. It is found as 6 ท 6
after ten trials. Table 1 shows the usage frequency of the nodes of the network in the segmentation of
the image shown in Fig. 4(a). In order to segment the image with five labels, the nodes with the highest five values in Table 1 are selected. The others are removed from the network. The same processes are realized for the second feature extraction method. Fig. 4(a) and (b) show the labels (color) of the nodes of the Kohonen network for each pixe by using the first and the second feature extraction methods, respectively.