209 research outputs found
Asymmetric Feature Maps with Application to Sketch Based Retrieval
We propose a novel concept of asymmetric feature maps (AFM), which allows to
evaluate multiple kernels between a query and database entries without
increasing the memory requirements. To demonstrate the advantages of the AFM
method, we derive a short vector image representation that, due to asymmetric
feature maps, supports efficient scale and translation invariant sketch-based
image retrieval. Unlike most of the short-code based retrieval systems, the
proposed method provides the query localization in the retrieved image. The
efficiency of the search is boosted by approximating a 2D translation search
via trigonometric polynomial of scores by 1D projections. The projections are a
special case of AFM. An order of magnitude speed-up is achieved compared to
traditional trigonometric polynomials. The results are boosted by an
image-based average query expansion, exceeding significantly the state of the
art on standard benchmarks.Comment: CVPR 201
AffineGlue: Joint Matching and Robust Estimation
We propose AffineGlue, a method for joint two-view feature matching and
robust estimation that reduces the combinatorial complexity of the problem by
employing single-point minimal solvers. AffineGlue selects potential matches
from one-to-many correspondences to estimate minimal models. Guided matching is
then used to find matches consistent with the model, suffering less from the
ambiguities of one-to-one matches. Moreover, we derive a new minimal solver for
homography estimation, requiring only a single affine correspondence (AC) and a
gravity prior. Furthermore, we train a neural network to reject ACs that are
unlikely to lead to a good model. AffineGlue is superior to the SOTA on
real-world datasets, even when assuming that the gravity direction points
downwards. On PhotoTourism, the AUC@10{\deg} score is improved by 6.6 points
compared to the SOTA. On ScanNet, AffineGlue makes SuperPoint and SuperGlue
achieve similar accuracy as the detector-free LoFTR
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