Graphics Reference
In-Depth Information
×
512 pixels) of two remote sensing im-
ages. Fig. 2(a) and (b) are acquired by Band 4 of the Landsat Enhanced Thematic
Mapper Plus (ETM+) sensor of the Landsat-7 satellite in an area of Mexico in April
2000 and May 2002. A reference map was manually defined as shown in Fig. 2(c).
The first dataset represents a section (512
Fig. 2. Multi-images relating to the area of Mexico. (a) The image acquired in April 2000, (b)
The image acquired in May 2002, (c) The reference map.
×
300 pixels) of two remote sensing
images. Figs. 3(a) and (b) are acquired by Band 4 of the Landsat Thematic Mapper
(TM) sensor of the Landsat-5 satellite on the Lake Mulargia on the Island of Sardinia
(Italy) in September1995 and July 1996. A reference map was manually defined as
shown in Fig. 3(c).
The second dataset represents a section (412
Fig. 3. Multi-images relating to Sardinia. (a) The image acquired in September1995, (b) The
image acquired in July 1996, (c) The reference map.
4.2
Results and Analysis
In this section, we compare our method with three widely used methods ( i . e ., Nonsub-
sampled Contourlet Transform (NCT) [16], Dual-Tree Complex Wavelet Transform
(DTC) [17] and Undecimated Discrete Wavelet Transform (UDWT) [18]).
In our experiments, we set the parameter
4
4
ʻ
of LRR to
26
×
10
and
12
×
10
for the first and second experiments, respectively. The final results of change detec-
tion under different methods are shown in Figs. 4 and 5. It is obvious that DTC and
UDWT have a lot of isolate pixels. NCT leads to the loss of the large amount of edge
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