International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004
geologic), the output metric values would have been much
higher (over 0.8).
Generally, from the qualitative and quantitative comparison of
the HOUGH Transform by Fitton-Cox and the edge detection
algorithms it is inferred that edge detection algorithms perform
better in terms of Pratt quantitative evaluation, while the
HOUGH Transform is superior concerning the Rosenfeld
metric. The latter makes sense because the modified HOUGH
Transform algorithm extracts fully connected lines using pixels.
Furthermore, the performance of the Fitton-Cox algorithm is
characterized by a localization problem, meaning that the
extracted lines are not accurately localized comparatively to the
edge detection algorithms and, the length of the extracted lines
is fully dependent on the selection of the input parameters. On
.the other hand, a line is what the photointerpreters represent a
lineament with, and not a curvilinear segment.
3. CONCLUSIONS
One main aspect from applying the edge detection algorithms is
the capability of extracting segments that really follow the
terrain topography. This leads to the extraction of the exact
shape of the geomorphologic features, as the caldera in this
case. Taking also into consideration that these algorithms
perform well in terms of coherence, edge localization and high
edge response, the implementation of edge detection algorithms
provides useful means towards automated lineament mapping.
Finally, the HOUGH Transform is quite useful for line
extraction, but it requires a proper parameter setting and
adjustments to be applicable in different terrain and
illumination conditions of natural scenes when applied to
satellite data. Its performance to the Digital Elevation Model
could be further investigated.
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