Optical Flow in Single Video Frame

Question

youngz 2019-7-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/472348-optical-flow-in-single-video-frame

回答： kuku hello 2022-3-27

Hi,

I am looking to the example available in the pages of the different algorithms implementations of optical frame (e.g., https://it.mathworks.com/help/vision/ref/opticalflowlk.html ).

The optical frame should estimate the direction and speed between two frames in a video. Anyway, in the example, it gets in input a single video frame - i.e. flow = estimateFlow(opticFlow,frameGray); -. Consequentially, how it is able to compute the flow using a single image?

Thanks

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Answer 1

Roshni Garnayak 2019-8-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/472348-optical-flow-in-single-video-frame#answer_385895

在 MATLAB Online 中打开

In the example (https://www.mathworks.com/help/vision/ref/opticalflowlk.html), an optical flow object has been created using the class opticalFlowLK. This class has a function estimateFlow which computes the optical flow between the frame specified in the argument of the function and the previous frame.

For detailed working of the function, you can type the following command in the Command Window:

edit estimateFlow

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Tintumon 2021-1-28

编辑：Tintumon 2021-1-28

I went through the estimateFlow code and understood that the previous frame is obtained from the frame buffer.

But,I needed to evaluate the optical flow methods for two consecutive images (as obtained from middlebury dataset). In this case, is there any workaround to estimate optical flow for only the two given frames?

Specifically I wanted to evaluate the Lukas Kanade, Horn & Schunk, Farnebach optical flow algorithms (which are all part of estimateFlow class, I believe.)

Julius Å 2021-2-11