CVPR - Dec. 2001 Scene-Consistent Detection of Feature Points in Video Sequences Ariel Tankus & Yehezkel Yeshurun Tel-Aviv University Outline: Relating convexity-based detection of feature points to scene geometry. Feature points tracking algorithm. Comparison with two other methods.
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CVPR - Dec. 2001
Scene-Consistent Detection ofFeature Points in Video Sequences
Ariel Tankus & Yehezkel Yeshurun
Robust detection of scene-consistent features in video sequences.
Detect convex or concave image domains.
Detect local “circles” where the gradient of the intensity function points outward along the whole circle.
The gradient points in all orientations along the “circles”.
At the discontinuity ray of the arctan: Yarg.
Darg - An isotropic variant of Yarg.
The basic observation:
Response of Yarg to theIntensity Surface (cont.)
The cases include: Some configurations where
is a local extrema of , and
some configurations where one side of
is flat, but the other is convex or concave.
Only specific differential geometry structures of the intensity function causes Yarg.
Time(correct 3D point is tracked)
Completeness of track T =
Time(correct 3D point appears in video)
Correct 3D point of track T =
3D point tracked for the longest time under track T
Stability of tracking in frames fi, fi+1 =
#tracks following the correct 3D point in both fi, fi+1
#tracks containing points in both fi, fi+1
Measures for Evaluation of Scene-Consistency (cont.)