Results
This page contains some example results of automated landmark
detection and change detection.
Landmark Detection
The following two images were taken two years apart on Mars. They
were analyzed independently to identify landmarks (visually salient
regions) without human intervention. The selected landmarks, which
are outlined in red, include dark slope streaks, ridges, and steep slopes.
To obtain these results, the salience threshold was automatically (and
independently) selected given the distribution of salience across each image.
 |
 |
| MOC M16-00596, June 12, 2000 |
MOC E15-00356, April 12, 2002 |
Landmark-based Change Detection
These change detection results were obtained when comparing manually
annotated landmarks (here, just the dark slope streaks) in the two
images. Additional constraints are needed when working with the
automatically detected landmarks. Stay tuned for those results!
All landmarks are correctly matched between the two original images,
and the two new dark slope streaks are correctly identified (marked in
red). Click for a larger version.
 |
| MOC M16-00596, June 12, 2000 |
MOC E15-00356, April 12, 2002 |
Pixel-based Change Detection
In these results, we registered the two original source images
together at the pixel level, then subtracted the new one from the old
one. The result is a difference map that shows changes on a per-pixel
basis. Here, blue indicates areas that got darker in the second
image, while yellow indicates areas of brightening.
| Home Plate: Spirit's journey. Spot the
rover and its tracks! |
 |
 |
 |
| HiRISE PSP_001513 (11/22/06) |
HiRISE PSP_009174 (7/11/08) |
Difference |
|
| El Dorado dune field: new dust devil tracks
and mysterious bright->dark spots |
 |
 |
 |
| HiRISE PSP_003900 (5/27/07) |
HiRISE PSP_010097 (9/21/08) |
Difference
Morphing
video (AVI)
|
|
| Nicholson Crater: new dark slope streaks |
 |
 |
 |
| THEMIS V01853007 (5/16/02) |
THEMIS V17467028 (11/22/06) |
Difference
Morphing video
(AVI)
|
|
