What do the arrows depict in the optical-flow visualizations such as the one below?
(image source: learnopencv)
Is it correct to say that the pixel at the tip of an arrow was at the origin of the arrow in previous frame?
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$\begingroup$ It depends! What you say is correct for live / real-time video. But if you're post-processing pre-recorded video then you have all the frames including those at $t+1$. $\endgroup$– Peter K. ♦Nov 2, 2021 at 17:45
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$\begingroup$ @PeterK. I have modified the question. $\endgroup$– orbitJan 24, 2022 at 8:23
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Yes, as your linked page shows:
the idea is that the pixels move from $(x,y)$ in the first from to $(x+\Delta x, y + \Delta y)$ in the second. I believe the image you quote is just connecting a series of $(x_i,y_i)$ with their next locations $(x_i+\Delta x_i, y_i + \Delta y_i).$
