EuroSDR Projects - Host Ireland

• Ikonos1_Sub1: This image shows an urban/suburban scene and has been processed by six
approaches, none giving a practically useful result. It seems to be too hard a challenge for the
current approaches, although one has to notice that the results are notably better than for the whole
scene, i.e., Ikonos1, from which it is a representative part. Beumier has only submitted this one
result, but it is the best for this scene (Figure 6). It shows that a good line extractor combined with
spectral information (NDVI) and well chosen constraints on the geometry can produce a pretty
good result. Multiplying completeness with correctness gives a similarly high value for the
approaches of Bacher, Malpica, and Zhang. Looking at the individual results, however, one can
very well see the different trade-offs one can make particularly for difficult images between
completeness and correctness. Yet for practical applications, the high correctness values for
Bacher and Malpica would probably be preferred.
Figure 6: Ikonos1_Sub1 – Beumier; colors cf. Fig. 1
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