Weird optical flow output w.r.t. older implementations of NVOF

Gaming and Visualization Technologies Video Processing & Optical Flow
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I used the NVIDIA Optical Flow SDK almost an year ago with great satisfaction. Some days ago I got access to a new machine equipped with an RTX 3080 GPU and I decided to try the new version 2.0 using latest OpenCV.

However, it seems that the performance, at least for my scenario, became worst.

Given a frame with static background and a moving object (held by a person whose arm is part of the scene), the output of the NVOF 1.0 one year ago on a mobile RTX 2080 was the following:

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11280×720 69.9 KB

Instead, using the new RTX 3080 and latest OpenCV and NVIDIA drivers I am getting totally different result.

This is the output of the NVIDIA Optical Flow 1.0 on the new configuration

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21280×720 160 KB

and this is the output when using version 2.0 with per-pixel precision

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31280×720 292 KB

While the flow associated to the object seems right, the static background that was almost white in the past now is full of non-zero flow vectors (even with huge magnitudes).

How is it possible? Can I do something to get back the old results (that were looking much better to me)?

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Any news about it?

3

Hi,
Can you share pair of input frames that you used? Which application you used to generate these results? We will like to reproduce this at our end and investigate.

Thanks.