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1.3 Classification by means of logical multi-valued tree. 
The characteristics revealed by means of pseudospectral, 
phological and morphometric analysis should be combined so as 
to classify every single object as belonging to or not belonging 
to the species in question. 
Each characteristic (value of area, length of perimeter , pre 
sence of mixed ansas, etc.) can be present in various species, 
but generally each species is characterized by typical combina 
mor 
tions of characteristics. 
On the other hand certain characteristics by themselves are 
not sufficient for the identification of the species, since they 
are only indicative: they identify the species when they are co 
mbined together. 
Establishing and making use of multiple-valued operators, we 
establish possible belonging to various classes: i.e. an object 
may be an olive tree, a citrus tree or an u.g.Oo. (unidentified 
ground object). 
Since, in natural images, the objects are not regular, and 
not all characteristics, appear completely clearly, it is not 
always possible to decide whether an object definitely belongs 
to a particular class. 
Thus it is necessary not only to define the classes of exis 
tance, but also to use different values to give a measure of the 
classification obtained in that particular examination, and of 
the operators who know to use the various levels. 
Thus if we are dealing with olive trees of different ages 
(denoted by A and B) along with an unidentified species (U) in 
an image, from observation of digitized images we know that the 
perimeter of the length between 24 and 5I units can be divided 
in three classes: 24-30 in which there are only young olive tre 
es and u.g.0.; 31-38 in which A,B and U coexist; and 38-5I in 
which A and U coexist. 
If, however, we take into account the observation about the 
area relative to the same two samples A and B within the 49-205 
range, we have: 
I) 49-57 B and U 
2) 58-II8 A and B and U 
3) II9-205 A and U. 
adding all this information together we come up with a ta 
By 
ble called multivalued operator 
perimeter 
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2 3