var dio
Fig. 10 The blue band of a scanned aerial photograph of
an urban area, size 256?, pizelsize 1.60m. The lower image
shows the outlines of the detected regions after passing the
entire procedure.
6.3 Real Images
Aerial Photograph (fig. 10a). Smoothing doesn’t im-
prove the results, due to the inherent removal of details by
smoothing. Predictor parameters: see SB image. Exper-
iments on setting the confidence levels yielded for Stage I
the range [95% — 99%]; for Stage Ila 99.9% was the only
reasonable setting and for Stage IIc 9596 was a good option.
Final region outlines are shown in fig. 10b.
800
Fig. 11 Landsat TM image of the Dutch Flevo Polder,
size 128?, obtained by summing up band 3, 4 and 5, and
rescaling the result to fit into the range [0-255]. The lower
image shows the outlines of the detected regions after pass-
ing the entire procedure.
Landsat TM Image (fig. 11 a). Predictor parameters:
see SB image. Optimal confidence level settings are: Stage
I 95%; Stage Ila 9996 and Stage IIc 95%. Note that in
Stage Ila, the confidence level is 99%. A confidence level of
99.9% yields too much merging of regions, due to the low
grey value differences between many parcels.
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