High accuracy optical flow estimation based on a theory for warping
High accuracy optical flow estimation based on a theory for warping
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DOI：
10.1007/978-3-540-24673-2_3
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发表时间：
2004-01-01
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影响因子：
--
通讯作者：
Weickert, J
中科院分区：
文献类型：
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作者：
Brox, T;Bruhn, A;Weickert, J
我们研究了一种用于计算光流的能量泛函，它结合了三个假设：亮度恒定假设、梯度恒定假设和保持间断的时空光滑性约束。为了允许大的位移，严格避免了两个数据项中的线性化。我们给出了一个基于两次嵌套不动点迭代的一致数值格式。通过证明该方案实现了一种从粗到精的翘曲策略，为目前主要在实验基础上使用的翘曲提供了理论基础。我们的评估表明，新方法给出的角度误差比以前的光流估计技术小得多。我们证明了它对参数变化相当不敏感，并且我们证明了它在噪声下的良好的稳健性。
We study an energy functional for computing optical flow that combines three assumptions: a brightness constancy assumption, a gradient constancy assumption, and a discontinuity-preserving spatio-temporal smoothness constraint. In order to allow for large displacements, linearisations in the two data terms are strictly avoided. We present a consistent numerical scheme based on two nested fixed point iterations. By proving that this scheme implements a coarse-to-fine warping strategy, we give a theoretical foundation for warping which has been used on a mainly experimental basis so far. Our evaluation demonstrates that the novel method gives significantly smaller angular errors than previous techniques for optical flow estimation. We show that it is fairly insensitive to parameter variations, and we demonstrate its excellent robustness under noise.