Stable Affine Frames on Isophotes
Stable Affine Frames on Isophotes
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等照度上的稳定仿射框架
DOI：
10.1109/iccv.2007.4408887
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Stepán Obdrzálek
中科院分区：
文献类型：
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作者：
Michal Perdoch;Jiri Matas;Stepán Obdrzálek
我们提出了一个新的仿射协变特征，稳定仿射框架（SAF）。SAF位于极值区域的边界上，即等照度线上。而不是要求整个等照度线是稳定的，相对于强度扰动的最大稳定极值区域（MSER），稳定性只需要局部，为构成三点帧的图元。基元提取的仿射不变的过程中，利用性质的双切线和代数矩。因此，代替使用闭合稳定等照度线，即MSER，并在其上检测仿射帧，SAF甚至在一些不稳定的极值区域上被寻求。我们在标准数据集上通过实验表明，SAF具有可与最先进的报告中测试的最佳仿射协变检测器（Mikolajczyk等人，2005年），并始终产生显着更高数量的功能，每个图像。此外，这些特征比MSER更均匀地覆盖图像，这有助于对遮挡的鲁棒性。
We propose a new affine-covariant feature, the stable affine frame (SAF). SAFs lie on the boundary of extremal regions, i.e. on isophotes. Instead of requiring the whole isophote to be stable with respect to intensity perturbation as in maximally stable extremal regions (MSERs), stability is required only locally, for the primitives constituting the three-point frames. The primitives are extracted by an affine invariant process that exploits properties of bitangents and algebraic moments. Thus, instead of using closed stable isophotes, i.e. MSERs, and detecting affine frames on them, SAFs are sought even on some unstable extremal regions. We show experimentally on standard datasets that SAFs have repeatability comparable to the best affine covariant detectors tested in the state-of-the-art report (Mikolajczyk et al., 2005) and consistently produce a significantly higher number of features per image. Moreover, the features cover images more evenly than MSERs, which facilitates robustness to occlusion.