I have some code that detects objects in a video (the video is of a lava lamp). I would like to measure the velocity of the bubbles using the centroid.

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Benjamin Dempsey 2016-2-20

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https://ww2.mathworks.cn/matlabcentral/answers/269168-i-have-some-code-that-detects-objects-in-a-video-the-video-is-of-a-lava-lamp-i-would-like-to-meas

回答： Image Analyst 2016-2-21

I'm assuming i will need to work out how far they move per frame but I'm struggling to work out how to do this as i am a beginner. Is it also possible to have a more accurate velocity by using say 10 frames? Any help is appreciated. Thanks

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Answer 1

Image Analyst 2016-2-21

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ExtractMovieFrames.m

Yes, you can measure the velocity in units of pixels per second. See my image segmentation demo: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862 as well as my attached demo for reading frames from a video.