Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest...
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Transcript of Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest...
![Page 1: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/1.jpg)
Evaluation of interest points and descriptors
![Page 2: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/2.jpg)
Introduction
• Quantitative evaluation of interest point detectors– points / regions at the same relative location
=> repeatability rate
• Quantitative evaluation of descriptors– distinctiveness
=> detection rate with respect to false positives
![Page 3: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/3.jpg)
Quantitative evaluation of detectors
• Repeatability rate : percentage of corresponding points
• Two points are corresponding if1. The location error is less than 1.5 pixel
2. The intersection error is less than 20%
homography
![Page 4: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/4.jpg)
Comparison of different detectors
[Comparing and Evaluating Interest Points, Schmid, Mohr & Bauckhage, ICCV 98]
repeatability - image rotation
![Page 5: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/5.jpg)
Comparison of different detectors
[Comparing and Evaluating Interest Points, Schmid, Mohr & Bauckhage, ICCV 98]
repeatability – perspective transformation
![Page 6: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/6.jpg)
Harris detector + scale changes
![Page 7: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/7.jpg)
Harris detector – adaptation to scale
![Page 8: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/8.jpg)
Evaluation of scale invariant detectors
repeatability – scale changes
![Page 9: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/9.jpg)
Evaluation of affine invariant detectors
0
40
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repeatability – perspective transformation
![Page 10: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/10.jpg)
Quantitative evaluation of descriptors
• Evaluation of different local features– SIFT, steerable filters, differential invariants, moment invariants,
cross-correlation
• Measure : distinctiveness– receiver operating characteristics of detection rate with respect to false positives
– detection rate = correct matches / possible matches– false positives = false matches / (database points * query points)
[A performance evaluation of local descriptors, Mikolajczyk & Schmid, CVPR’03]
![Page 11: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/11.jpg)
Experimental evaluation
![Page 12: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/12.jpg)
Scale change (factor 2.5)
Harris-Laplace DoG
![Page 13: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/13.jpg)
Viewpoint change (60 degrees)
Harris-Affine (Harris-Laplace)
![Page 14: Evaluation of interest points and descriptors. Introduction Quantitative evaluation of interest point detectors –points / regions at the same relative.](https://reader036.fdocuments.in/reader036/viewer/2022070400/56649f0d5503460f94c21a3d/html5/thumbnails/14.jpg)
Descriptors - conclusion
• SIFT + steerable perform best
• Performance of the descriptor independent of the detector
• Errors due to imprecision in region estimation, localization