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Fig.26 |
In [3] the operation of multiple smoothing
has been suggested. In this case smoothing is done{made} iterativelly until
the condition will be satisfied that at two sequential stages the same
zone (besides the unique one) has the maximum sum (among all zones at the
given stage). The center of this zone is accepted as a search cluster point.
Though such the procedure has not shown crucial advantages in comparison
with once made smoothing, it is expedient to have its in a collection of
tools of the analysis of hypogram intersection. Multiple smoothing will coordinate
a cluster point (zone) with its environment. If this point is on a cluster
boundary it is gradually shifted in its center. The stability of this point
(zone) at several sequential stages of smoothing is some performance of
its common reliability. Besides, if the cluster top is not acute, i.e.
consists of several zones that (due to the count of neighboring zones) one
zone of maximum weight will be allocated which position will depend on a
context (i.e. weightinesses of enclosing zones).
In last version
of program realization of hypotheses accumulation process an attempt
has been undertaken to limit an amount of the zones participating in the
subsequent procedure of smoothing. For this purpose so-called areas of
intersection were selected, which represent set of the zones marked more
than two hypograms, and also one time marked zones directly adjoining
to this set (the neighbourhood, as well as earlier, the nearest 3*3*3).
However, in spite of the fact that, for example in the circumscribed experiment,
execution time of the smoothing procedure on the average was reduced with
1.5 up to 0.5 s, it was additionally required about 0.5 s for detection
of these areas (thus the number of analysed zones was reduced on the average
in 5 times). Probably, this procedure will have essential advantages at
more rigid restrictions on entrance in an area of intersection. Naturally,
the operation of restriction of number of analysed zones has an essential
importance at multiply repeated smoothing.