The technique requires the epipolar geometry to be pre-estimated between each
image pair. It exploits the constraints which the camera movement implies, in
order to apply a closed-form correction to the parameters of the input
affinities. Also, it is shown that the rotations and scales obtained by
partially affine-covariant detectors, e.g., AKAZE or SIFT, can be completed to
be full affine frames by the proposed algorithm. It is validated both in
synthetic experiments and on publicly available real-world datasets that the
method always improves the output of the evaluated affine-covariant feature
detectors. As a by-product, these detectors are compared and the ones obtaining
the most accurate affine frames are reported. For demonstrating the
applicability, we show that the proposed technique as a pre-processing step
improves the accuracy of pose estimation for a camera rig, surface normal and
homography estimation.

通过预估每个图像对之间的极线几何关系，构造一种针对部分仿射协变特征检测器的标准仿射框架校正算法，并验证该算法可用于预处理步骤以提高相机姿态估计、表面法线和单应性矩阵等任务的准确性。

局部仿射参考系的最优多视角校正

Optimal Multi-view Correction of Local Affine Frames

Wide-baseline matching focussing on problems with extreme viewpoint change is
considered. We introduce the use of view synthesis with affine-covariant
detectors to solve such problems and show that matching with the Hessian-Affine
or MSER detectors outperforms the state-of-the-art ASIFT.
To minimise the loss of speed caused by view synthesis, we propose the
Matching On Demand with view Synthesis algorithm (MODS) that uses progressively
more synthesized images and more (time-consuming) detectors until reliable
estimation of geometry is possible. We show experimentally that the MODS
algorithm solves problems beyond the state-of-the-art and yet is comparable in
speed to standard wide-baseline matchers on simpler problems.
Minor contributions include an improved method for tentative correspondence
selection, applicable both with and without view synthesis and a view synthesis
setup greatly improving MSER robustness to blur and scale change that increase
its running time by 10% only.

介绍了使用仿射协变检测器结合视图合成来解决极端视角变化问题的宽基线匹配方法，并提出了 Matching On Demand with view Synthesis 算法以在保证几何估计可靠性的前提下尽量减少视图合成带来的速度损失。实验证明该算法在解决超越现有技术问题的同时与标准宽基线匹配器在简单问题上的速度相当。