A process for the processing of signals by which signal S is optimally
verified for association with objects of a desired class Z.sub.k (wherein
(with 1<=k<=number of different classes) and differentiated from
undesired objects. One or more classes Z.sub.A of undesired objects, and
beyond this, as an additional class, a rejection class R is defined, to
which all signals are assigned which are not clearly assignable to one of
classes Z.sub.k or Z.sub.A. Herein the decision criteria under which a
signal S is assigned to the reject class R is the comparison of the output
value P.sub.reject with the adjustable threshold value t, which is
provided by a classification algorithm.
