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This page is focused on the problem of detecting affine invariant features in arbitrary images and on the performance evaluation of region detectors/descriptors.

Affine Covariant Regions

affine regions from
veiwpoint 1
Image 1

affine regions from
viewpoint 2
Image 2

Publications

Region detectors	Harris-Affine & Hessian Affine: K. Mikolajczyk and C. Schmid, Scale and Affine invariant interest point detectors. In IJC V 60(1):63-86, 2004. PDF MSER: J.Matas, O. Chum, M. Urban, and T. Pajdla, Robust wide baseline stereo from maximally stable extremal regions. In BMVC p. 384-393, 2002. PDF IBR & EBR: T.Tuytelaars and L. Van Gool, Matching widely separated views based on affine invariant regions . In IJCV 59(1):61-85, 2004. PDF Salient regions: T. Kadir, A. Zisserman, and M. Brady, An affine invariant salient region detector. In ECCV p. 404-416, 2004. PDF All Detectors - Survey: T. Tuytelaars and K. Mikolajczyk , Local Invariant Feature Detectors - Survey. In CVG, 3(1):1-110, 2008. PDF
Region descriptors	SIFT: D. Lowe, Distinctive image features from scale invariant keypoints. In IJCV 60(2):91-110, 2004. PDF
Performance evaluation	K. Mikolajczyk, T. Tuytelaars, C. Schmid, A. Zisserman, J. Matas, F. Schaffalitzky, T. Kadir and L. Van Gool, A comparison of affine region detectors. In IJCV 65(1/2):43-72, 2005. PDF K. Mikolajczyk, C. Schmid, A performance evaluation of local descriptors. In PAMI 27(10):1615-1630 . PDF

Software

Region detectors - Linux binaries for detecting affine covariant regions.
Region descriptors - Linux binaries for computing region descriptors.
Detectors evaluation - Matlab files to compute the repeatability.
Descriptors evaluation - Matlab files to compute the matching score.

Test Data

The packages contain images in PPM format and homographies between image pairs. Data description.

Blur 1000x700 6 images	Blur 1000x700 6 images	Viewpoint 800x640 6 images	Viewpoint 1000x700 6 images
Zoom+rotation 765x512 6 images	Zoom+rotation 800x640 6 images	Light 921x614 6 images	JPEG compression 800x640 6 images