Aerospace and Electronic Systems Magazine July 2017 Tutorial XI - 18

Introductory View of Anomalous Change Detection

Figure 6.

EX-1. ROC and AC-ROC obtained by
discarding the CE or the LCRA from
the processing chain of the algorithm:
(a) SACD, (b) HACD, (c) SDACD, (d)
SDHACD, (e) SVACD.

Figure 7.

EX-1. (a) RGB representations of the test and the reference image in a
neighborhood of the target A3. (b) Decision statistics of the RX anomaly
detector (logarithmic scale) obtained on the test and the reference image
(neighborhood of the target A3). (c) Spectral radiance of the target A3 in
the two images.

nificantly when we exclude the CE from the processing chain. This
is because the two images were acquired with a time delay of about
15 min, so, in very similar acquisition conditions.
The SVACD exhibits the highest sensitivity to the lack of RE.
In fact, the ROC obtained without the CE is below that obtained
by using the entire processing chain. Nevertheless, also in this
case, the performance degradation is not relevant thanks to the
low radiometric distortion affecting the two images.
18

Fig. 6 shows that RMRE reduces the performance of all the
algorithms. This is particularly true for the SDACD, SDHACD,
and the HACD whose performance curves are well below those
obtained by using the LCRA approach. This is in accordance with
the remarks in Subsection II-D. In fact, the three algorithms are
particularly sensitive to false changes caused by the RMRE and,
especially to those changes related to the nontemporal anomalies.
It is not coincidence that the AC-ROC curve for each of those al-

IEEE A&E SYSTEMS MAGAZINE

JULY 2017, Part II of II



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