卢卡斯Kanade光流程，方向传染媒介 [英] Lucas Kanade Optical Flow, Direction Vector

问题描述

我正在研究光流，并根据这里的讲义和一些样品在互联网上，我写了这个Python代码。

I am working on optical flow, and based on the lecture notes here and some samples on the Internet, I wrote this Python code.

所有代码和示例图像也一样。对于大约4-5个像素的小位移，计算的向量的方向看起来很好，但是向量的大小太小（这就是为什么我在绘制它们之前将u，v乘以3）。

All code and sample images are there as well. For small displacements of around 4-5 pixels, the direction of vector calculated seems to be fine, but the magnitude of the vector is too small (that's why I had to multiply u,v by 3 before plotting them).

这是因为算法的限制，还是代码中的错误？上面分享的演讲注意到，运动需要很小u，v小于1像素，也许这就是为什么。这个限制的原因是什么？

Is this because of the limitation of the algorithm, or error in the code? The lecture note shared above also says that motion needs to be small "u, v are less than 1 pixel", maybe that's why. What is the reason for this limitation?

推荐答案

@belisarius说LK使用一阶近似，因此（u，v）应理想地< 1，如果不是，高阶项占据了行为，你是烤面包。。

@belisarius says "LK uses a first order approximation, and so (u,v) should be ideally << 1, if not, higher order terms dominate the behavior and you are toast. ".

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