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Asked: 2026-05-26T03:55:37+00:00

I am working on optical flow, and based on the lecture notes here and

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

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).

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?

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1 Answer

  1. Editorial Team

    @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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