Filtering of an image to find a bubble

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Jórdan Venâncio Leite 2022-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/1638775-filtering-of-an-image-to-find-a-bubble

评论： Image Analyst 2022-1-29

Hello, Please can you suggest any filters in which I can highlight the tip of this big bubble so i can find its position? I have several images and in each one this same bubble is in a different position. If I know the position of the bubble tip that is in this image here, i can also know the position of the other images.

The image height is 1024 pixels and has a value of 8.5cm

What I really need is to know how much this bubble has shifted in time if each image was taken one second after the other.

Thanks in advance.

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Answer 1

Image Analyst 2022-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/1638775-filtering-of-an-image-to-find-a-bubble#answer_884485

I think you've posted this before and I said there is no way to detect and track individual bubbles from that image. You'll have to look at something else to correlate with your process. Perhaps optical flow or something to determine how fast the pixels are moving upwards. Or maybe area fraction is correlated with your fluid's viscosity (or whatever). But if you insist on individual bubbles, I think it's a lost cause unless you're willing to draw them manually with drawellipse().