IEEE Trans Image Process - Scale- and affine-invariant fan feature.

Tópicos

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Resumo

Most existing feature detectors assume no surface discontinuity within the keypoints' support regions and, hence, have little chance to match the keypoints located on or near the surface boundaries. These keypoints, though not many, are salient and representative. In this paper, we show that they can be successfully matched by using the proposed scale- and affine-invariant Fan features. Specifically, the image neighborhood of a keypoint is depicted by multiple fan subregions, namely Fan features, to provide robustness to surface discontinuity and background change. These Fan features are made scale-invariant by using the automatic scale selection method based on the Fan Laplacian of Gaussian (FLOG). Affine invariance is further introduced to the Fan features based on the affine shape diagnosis of the mirror-predicted surface patch. The Fan features are then described by Fan-SIFT, which is an extension of the famous scale-invariant feature transform (SIFT) descriptor. Experimental results of quantitative comparisons show that the proposed Fan feature has good repeatability that is comparable to the state-of-the-art features for general structured scenes. Moreover, by using Fan features, we can successfully match image structures near surface discontinuities despite significant scale, viewpoint, and background changes. These structures are complementary to those found by the traditional methods and are especially useful for describing weakly textured scenes, which is demonstrated in our experiments on image matching and object rendering.

Resumo Limpo

exist featur detector assum surfac discontinu within keypoint support region henc littl chanc match keypoint locat near surfac boundari keypoint though mani salient repres paper show can success match use propos scale affineinvari fan featur specif imag neighborhood keypoint depict multipl fan subregion name fan featur provid robust surfac discontinu background chang fan featur made scaleinvari use automat scale select method base fan laplacian gaussian flog affin invari introduc fan featur base affin shape diagnosi mirrorpredict surfac patch fan featur describ fansift extens famous scaleinvari featur transform sift descriptor experiment result quantit comparison show propos fan featur good repeat compar stateoftheart featur general structur scene moreov use fan featur can success match imag structur near surfac discontinu despit signific scale viewpoint background chang structur complementari found tradit method especi use describ weak textur scene demonstr experi imag match object render

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